Dodge

Dodge Repair Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Dodge
This answer was rated:

1996 Dodge Ram 1500 4 x 4 Automatic, 5.2 V8. Did a

transmission replacement. While doing that...
1996 Dodge Ram 1500 4 x 4 Automatic, 5.2 V8. Did a transmission replacement. While doing that , the wire came of the CKP sensor. Installed a new sensor and the engine started right up and ran for about 5 minutes. After that it would just barely idle and whne given any throttle, it would die. Thought the new CKP died so put in aniother one. Now it won't even idle. Only way I can get it to start is by using Clear Flood Mode and then it fires and dies. Fuel pressure is at 50 psi. Whne I did get it to idle, it would run very rich and could only get 6 inches of manifold vacuum. I tried plugging every vacuum fitting and no joy. The Map sensor reads about 4.4 with KOEO. Also did a smoke test and found no vacuum leaks.
Show More
Show Less
Ask Your Own Dodge Question
Answered in 1 minute by:
9/19/2016
Amedee
Amedee, Dodge Technician
Category: Dodge
Satisfied Customers: 26,804
Experience: ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector
Verified

Hello and welcome!

My name is ***** ***** I can assist you with your question.

Ask Your Own Dodge Question

If at any point during this conversation you would like to speak on the phone, feel free to request a phone call on your end and I will call you right away. Or simply let me know and I can get the process going

Ask Your Own Dodge Question

NO codes in the computer?

Does it run better on alternative fuel if you were to disable the fuel system?

Ask Your Own Dodge Question
Customer reply replied 1 year ago

No Codes. Haven't tried alternative fuel but can hook up my pressure injector cleaner. The fuel is fresh and volume and pressure are good. The Short Term Fuel trim when it did idle was over (-20)% so obviously running very rich.

Try disconnecting the electrical connector going to the crank sensor and see if the engine starts and runs of if it starts and runs any better (allow for longer cranking time). Also, check the distributor sync in your scan tool while the engine is running.

Ask Your Own Dodge Question
Customer reply replied 1 year ago

I have tried disconnecting the crank sensor and engine will not start. I know that some Chrysler products are very sensitive to CMP/CKP sensors. But two new sensors?

No, I dont think the crank sensor is bad.. although that is possible. We need to try and figure out if this is a base engine mechanical problem or an ignition related issue.

Ask Your Own Dodge Question
Customer reply replied 1 year ago

Well, I know it gets fuel and spark. I have not touched the didtributor but could have disturbed some wires when trying to plug the CKP back in behind the distributor. Here is something odd though. With the first new CKP it would at least idle, rough but idle. With the second new one it will not run at all.

You might want to replace it under warranty just to be sure thats not an issue

Ask Your Own Dodge Question
Customer reply replied 1 year ago

The CKP? I did that this morning :-)

I know.. I was just suggesting to do it again..

Ask Your Own Dodge Question

You can also check the signal from the camshaft position sensor inside the distributor as well as checking the distributor sync to ensure things did not get out of alignment when doing this recent repair.

Ask Your Own Dodge Question

Another possible cause would be a damaged flexplate causing an irratic signal or reading from the crank sensor as the engine is running. This could have been done by accident when doing the transmission replacement.

Ask Your Own Dodge Question
Customer reply replied 1 year ago

Possible, but it ran fine for a couple of minutes before all this started.

I can scope the CMP but not sure about the distributor sync whne engine is not running. I just did a relative compression test, triggering of the cyl 1 injector. Please have a look at the screenshot.

Thanks for the upload! Are you able to scope the crank signal?

Ask Your Own Dodge Question
Customer reply replied 1 year ago

According to the wiring diagram that I have, pin A8 of the PCM is the crank signal. All I get when cranking is a straight 4+ volts, no wave at all.

YES, I just double checked. That is the correct pin. Provided you are on the right wire and pin going into the PCM, this is most likley the issue.

Ask Your Own Dodge Question
Customer reply replied 1 year ago

Since I can't get to the CKP connector, I am measuring right at the PCM, Grey and black signel and purple and white 5 V reference. Are these after market sensors known to be a problem?

YES, but I dont think thats the problem. I suspect there is a wiring issue from the crank sensor to the PCM

Ask Your Own Dodge Question
Customer reply replied 1 year ago

OK. can I run wires direct from the crank sensor to the PCM to eliminate that problem? There are only 3 wires - 5V Ref, Ground and Sense. Correct?

YES and YES

Ask Your Own Dodge Question

Thanks for the pic! Which circuit or where do you have this hooked up to?

Ask Your Own Dodge Question
Customer reply replied 1 year ago

Hooked up to line A8 of the PCM (CKP sense) The on off times seem a bit strange.

Why is that?

Ask Your Own Dodge Question
Customer reply replied 1 year ago

On other vehicles that I have worked on, the on and off times seem nearly identical. Even now, the engine will not start.

Have you tried checking the cam signal? Can we check that while the engine is cranking real quick?

Ask Your Own Dodge Question
Customer reply replied 1 year ago

Let me go and hook up the scope. By the way, what should the manifold vacuum read while cranking?

That is a very good question. It depends on if you were to seal off the throttle body air tight. If you dont do this, it would only pull a few inches of vacuum. If you seal off the throttle body nice and tight, it should get up to double digits pretty fast while cranking.

Ask Your Own Dodge Question
Customer reply replied 1 year ago

Here is the screen shot of the CKP/CMP. Yellow is CKP

It looks good to me but youl want to verify that to a good known cam/crank wave form. I think IATN.net has good known wave forms you can access.

Are you able to upload a video of the engine cranking over so I can view it?

Ask Your Own Dodge Question
Customer reply replied 1 year ago

What exactly would you like in the video. Also, The Vacuum while cranking over is only about 2 inches. Would this not make the MAP think that it is operating at high throttle and cause the fuel to be pouring.

I would like to hear the engine crank over. I would also like to view the engine from the front of the vehicle watching it crank over and listening to it. You would need an assistant to crank the engine over while you take a video.

Ask Your Own Dodge Question

If the engine compression is good and vacuum is normal and the ignition timing is dead on or close to being correct, but the MAP sensor is not getting a good signal or sending a good signal back to the computer, it would simple prevent the PCM from either pulsing the injector open or yes, causing them to open up more than they should. All you would need to do is disconnect the fuel system and see if the engine runs on starting fluid. It should very well run on starting fluid no problem when doing this test. If not, something else is wrong that needs to be adressed.

Ask Your Own Dodge Question
Customer reply replied 1 year ago

I can get it to run on starting fluid, although rough. Here is something else - I just scoped the injectors. The on time is over 50 ms where It should be less than 5 ms at idle.

Try disconnecting all connectors going to all fuel injectors and see if you can get it to run nice and smooth on starting fluid.

Ask Your Own Dodge Question
Customer reply replied 1 year ago

Same thing. I can get it to run but somewhat rough and inconsistant.

Then something else must be going on. Either the ignition system or a base engine mechanical problem.

Ask Your Own Dodge Question
Customer reply replied 1 year ago

I've scoped both primary and secondary ignition. Both look good. I've smoke tested the intake system and found no vacuum leaks, But, what other than the MAP sensor would cause a 50ms injector pulse? Also, looking at the relative compression test, does it seem like there is a mechanical issue? Also, if you look at that relative compression test, see when the injector opens. Seems way before TDC - no?

Almost seems that the injector is open on the compression stroke??

The engine coolant temp sensor and TPS are the other two sensors the PCM uses for injector pulse width. I do know the injector is supposed to open on the exhaust stroke. This is normal. Even if the injector timing was off, then the engine would still run smooth on starting fluid.. which is doesn't. That leaves a base engine mechanical problem or an ignition timing issue. Did you check the distributor sync yet on your live data?

Ask Your Own Dodge Question
Customer reply replied 1 year ago

When you say distributor sync, are you asking about CKP/CMP sync?

Yes Sir

Ask Your Own Dodge Question
Customer reply replied 1 year ago

Yes, when it was running it was in sync.

Right.. but it should give you a number. It might be another pid

Ask Your Own Dodge Question
Customer reply replied 1 year ago

I don't remember that. Are you talking about the angle difference? It was 4. I just did a real compression test. Similar to the relative one. Most at 155, a couple at 120 and one at 100. Not great, but should still run, as it did whne it came in. All the plugs are jet black and fuel fouled.

The fuel fouled plugs are due to the running issue. Either too much fuel or an ignition timing issue like I suspect. I hate to say it, but it may be a damaged flywheel.

Ask Your Own Dodge Question

YES, the pid for the distributor sync should be 0 degrees plus or minus 2 degrees.

Ask Your Own Dodge Question
Customer reply replied 1 year ago

I can try and see if it will show while cranking

ok

Ask Your Own Dodge Question
Customer reply replied 1 year ago

Re: the flywheel, would the CMP/CKP not be out of Sync?

Yes because the crank sensor gets its signal from the flywheel

Ask Your Own Dodge Question
Customer reply replied 1 year ago

Distributor sync is 0. Ignition timing is about 8 BTDC while cranking. Did a relative compression watching the coil secondary and the firing is right around TDC, so I assume valve timing is ok. The only thing so far that is not right is that the injector pulse is 10 times what it should be at cranking.

What is the TPS and MAP signal at when cranking?

Ask Your Own Dodge Question

And that still would not explain why this suddenly happened right after this work was done..

Ask Your Own Dodge Question
Customer reply replied 1 year ago

TPS is .62 VDC and MAP is 4.2 VDC while cranking

Those readings are good my friend.

Ask Your Own Dodge Question
Customer reply replied 1 year ago

If the MAP is at 4.2, wouldn't it think that you are at almost full throttle? What else could cause a 50ms injector pulse width?

At 4.20 volt that indicates less than 5 inches of vacuum. Again, without sealing off the throttle body, your not going to have much vacuum when cranking.

Ask Your Own Dodge Question
Customer reply replied 1 year ago

Got it. So, Valve timing is good, ignition timing is good crank and cam signals are good, TPS is good, MAP is good. Just getting flooded with fuel. Before I lose all my hair, what else can I test to see the cause?

I think the plugs are fouled out because the ignition timing is not correct. That is my theory. Distributor cap, rotor, ignition wires maybe? I can opt out and leave this question open for other experts to see if they have some other ideas that may help. Good luck!

Ask Your Own Dodge Question

.

Ask Your Own Dodge Question
Customer reply replied 1 year ago

Just before you leave, would you answer two things fpr me. What should the ignition timing be while cranking and what should the injector pulse width be while cranking. Thank you.

Hello and good morning. I logged off last night before I saw your reply. As far as I am aware of, the manufacture does not release that specific information. It would sure be helpful if they did as it would help us in this particular situation. However, I cannot find this information for this vehicle and I dont think I have ever come accross this information for any vehicle. I am very sorry.

Ask Your Own Dodge Question
Customer reply replied 1 year ago

First, I would like to thank you for all your help and timely responses. Second , I want to tell you that I found the problem. I usually start with the obvious, but failed to do so this time. I woke up in the middle of the night and had a lucid moment. I reviewed all the information and the low manifold vacuum kept bothering me. Since everything checked out on the scope, decided to see if I had an exhaust blockage. Sure enough, I removed the upstream O2 sensor and the engine fired right up and ran perfectly. Tom.

Hello Tom! Thanks for the heads up and feedback! That is great news! I am glad to hear it is running good.

However, a few things.

First, exhaust does not plug up that fast. At least based on my experience. It takes time for it to cause low engine vacuum. It happens slowly over a long period of time. Based on your description of the problem, it was running good and then 5 minutes later it started running rough. In addition, this would not be related to any of the recent work that was done. So it must be a coincidence? Did you do anything to the exhaust while replacing the transmission?

Either way, I am glad to hear it is running good!!

You are most welcome!

Amedee
Amedee, Dodge Technician
Category: Dodge
Satisfied Customers: 26,804
Experience: ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector
Verified
Amedee and 87 other Dodge Specialists are ready to help you
Ask your own question now
Customer reply replied 1 year ago

Since the exhaust was taken off during the repair, and the catalytic brick was in pieces, I assume it moved around and plugged the cat.

Ask Amedee Your Own Question
Amedee
Amedee
Amedee, Dodge Technician
Category: Dodge
Satisfied Customers: 26,804
26,804 Satisfied Customers
Experience: ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector

Amedee is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I AM VERY GLAD THAT I TOOK A CHANCE ON YOUR PROBLEM SOLVING SKILLS. I WAS SUCCESSFUL IN REPLACING THE FUEL PUMP. MY TRUCK RUNS LIKE A CLOCK. IT RUNS LIKE THE DAY I BOUGHT IT. NO LUNGING FORWARD, THE TURBO REACTS THE SECOND I STOMP ON THE GAS, AND IT HAS A LOT MORE POWER AND EVEN SOUNDS BETTER TO ME. IT SAVED ABOUT $500.00 BY DOING THE WORK MYSELF. I GIVE YOU ALL THE CREDIT FOR YOUR DIAGNOSING THE PROBLEM, JUST FROM THE SYMPTONS I GAVE YOU OVER THE e MAIL. I WILL USE YOUR WEB SITE AGAIN AND REFER MY FRIENDS. THANKS SO MUCH FOR THE HELP.

TOM WHITTAKERUSA

Just a quick line to tell you how pleased I am to have my brakes working properly after all this time. Your answer was what I needed. I would certainly recommend you highly. God bless!

Rev. Jerry BaysingerHolts Summit, Mo

I recently asked a question about my 2005 dodge ram, and I just wanted to let my Expert know that he hit the nail squarely on the head with his answer. I wanted to thank him again.

GregPittsburgh, PA

Just a quick line to tell you how pleased I am to have my brakes working properly after all this time. Your answer was what I needed. I would certainly recommend you highly. God bless!

JerryHolts Summit, MO

I was skeptical at first but thought I'd give it a try. I was pleasantly surprised. Your site actually is a quality service that I would recommend to others in a heartbeat.

StanSayre, PA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

< Previous | Next >

Meet the Experts:

Jerry

Jerry

Master Mechanic

1,754 satisfied customers

ASE Master tech, 30 years exp. troubleshooter, driveability tech

Chris

Chris

Shop Foreman

6,613 satisfied customers

Dodge/Cummins and Chrysler Certified Master Tech

Mopar Certified

Mopar Certified

Dodge Technician

5,931 satisfied customers

24 Year Chrysler/Dodge Certified Specialist

moparfl

moparfl

ASE Certified Technician

3,292 satisfied customers

ASE Master Tech Gold level Chrysler Status 30 years dealership exp

Dodgerench

Dodgerench

ASE Certified Technician

2,809 satisfied customers

30+ years Dodge/Chrysler exp., ASE Master with L1 certification. Driveability/ combustion specialist

Tim Mohr

Tim Mohr

ASE MASTER TECH

2,298 satisfied customers

30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL

Don - Mo Lurch

Don - Mo Lurch

Aftermarket & Factory Electronics

1,562 satisfied customers

Cert. Dodge & Chrysler Warnty, Heavy Line Mech, Mobile Electronics. Sales, Installation & Repair for 30 years

< Previous | Next >

Related Dodge Questions
Driving down the interstate in my 97 Dodge Ram 1500 and
Driving down the interstate in my 97 Dodge Ram 1500 and suddenly, it is revving but power is dropping. Wouldn't go over 20 mph or so after that. What's possibly wrong?suddenly… read more
Amedee
Amedee
Dodge Technician
26,804 satisfied customers
I have a 2005 dodge ram 1500 with a 4.7L V8 with a misfire.
I have a 2005 dodge ram 1500 with a 4.7L V8 with a misfire. … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
I've got a 2007 ram 1500 with the 5.7 hemi and automatic. I
I've got a 2007 ram 1500 with the 5.7 hemi and automatic. I picked it up at auction, it didn't start but the engine turns. I've replaced the battery, plugs and camshaft sensor, still no luck. The tran… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Miss fire # 7 low compression. 2002 ram 1500. Plugs, wire,
miss fire # 7 low compression JA: What is the model/year of your Dodge? Customer: 2002 ram 1500 JA: Are you fixing your Ram 1500 yourself? What have you tried so far? Customer: plugs, wire, injector J… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
2002 Dodge Ram 1500 light issue. Tail light on one side not
2002 Dodge Ram 1500 light issue. Tail light on one side not working. I had a problem with headlights and tail lights working sporadically. I have replaced all sockets, pcm, light control module, light… read more
Amedee
Amedee
Dodge Technician
26,804 satisfied customers
2004 dodge ram 1500 hemi won't start. No fire to plug.
2004 dodge ram 1500 hemi won't start. No fire to plug. Changed the camshaft position sensor … read more
tim37857
tim37857
Mechanic
High School or GED
71 satisfied customers
I have a 4x4 06 dodge ram 1500 and can not find where the
I have a 4x4 06 dodge ram 1500 and can not find where the abs plugs in on the front passenger side … read more
Amedee
Amedee
Dodge Technician
26,804 satisfied customers
I replaced the ignition switch on my 04 Ram 1500 due to
I replaced the ignition switch on my 04 Ram 1500 due to intermittent fan operation. Worked perfectly for about 4 months. Fan stopped working 2 days ago, not even intermittent operation. Fuse is good. … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
3,927 satisfied customers
I have a 2000 dodge ram 1500 the transfer case is out I
I have a 2000 dodge ram 1500 the transfer case is out I picked up a 1999 dodge durango transfer case the only difference I see is my truck has a vacuum diafram and the Durango has a electric one can I… read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
09 ram 1500 4x2 183227.0miles on orig trans.. never had a
09 ram 1500 4x2 183227.0miles on orig trans.. never had a problem serviced regularly. trans is stuck in 4th gear. what is the fix??? … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
08 ram 1500, will act like its turning over but wont start.
08 ram 1500, will act like its turning over but wont start … read more
Amedee
Amedee
Dodge Technician
26,804 satisfied customers
I drive a dodge ram 1500. In the mornings especially cold
I drive a dodge ram 1500. In the mornings especially cold ones the truck requires a lot of throttle to start moving. At the first couple of stops it dies. At times you can prevent it by removing press… read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
Dodge ram 1500 wiper arm are in the middle of the windshield
dodge ram 1500 wiper arm are in the middle of the windshield when they are in parking position and they goes down before going up. Fortunately they are operating well but is bad to having them in the … read more
Howard Duncan
Howard Duncan
Business Owner
Vocational, Technical or Trade Scho
227 satisfied customers
Locked key fob in dodge ram 1500 with motor running. But,
locked key fob in dodge ram 1500 with motor running … read more
Chris
Chris
Shop Foreman
6,613 satisfied customers
Dodge RAM 1500: Do you know where the ambient air temperature
Do you know where the ambient air temperature sensor for my 2000 Dodge Ram 1500 pick up is?… read more
Mopar Certified
Mopar Certified
Dodge Technician
Vocational, Technical or Trade Scho
5,931 satisfied customers
2012 ram 1500. cylinder 5 misfire. Took it to the dealer and
2012 ram 1500. cylinder 5 misfire. Took it to the dealer and it's a stuck lifter wore out the cam. having done some research this seems to be a relatively common problem. Is that your experience as we… read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
Got a03 Dodge ram 1500 changed platum on it and now can't
Got a03 Dodge ram 1500 changed platum on it and now can't get it to run unless I pull too spark plugs out got all new sencers and water pump good oil pursure good compression and fuel pressure … read more
Amedee
Amedee
Dodge Technician
26,804 satisfied customers
Abs on ram 1500 2014 activating at slow speeds, no and no,
abs on ram 1500 2014 activating at slow speeds JA: Have you checked the brake fluid? And have the brakes been squeaking? Customer: no and no JA: Are you fixing your Ram 1500 yourself? What have you tr… read more
camerontech
camerontech
20 year experience diagnostic technician
class a
544 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x