Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Chevy
This answer was rated:

Ignition problems, 94 S-10 pickup,4.3 vortec, 2 wheel

Ignition problems, 94 S-10 pickup,4.3...
Ignition problems, 94 S-10 pickup,4.3 vortec,XXXXX 205,000 miles. Recent history...replaced clutch, pp, release bearing, etc. Got it back together she would crank but if you turned her off after warm she wouldn't start again. Replaced coil, worked great for a few days then started skipping intermitantly. Replaced cap, roter button and coil wire. No better. Replaced pickup coil and things got better for a few days, then she started skipping again. Seemed to miss worse under light load. Now she will not start...no fire from coil, but I do have voltage going into coil. I have a simple ohm meter but resistance testing is unclear insofar as decimal places and such.Did I miss something pertaining to the charge coil replacement...that was a first time thing for me?
Show More
Show Less
Ask Your Own Chevy Question
Answered in 12 hours by:
8/28/2007
41Modified
41Modified, Auto Service Technician
Category: Chevy
Satisfied Customers: 1
Experience: ASE Master Tech,over 20 years experience in GMC truck Dealer
Verified
Hello! If the problem started after replacing the clutch parts, i would double check to be sure that none of the wiring harness got trapped or pinched between the engine block and tranmission bell housing causing intermittent short circuits in the electrical system. Take a look and let me know...
41Modified
41Modified, Auto Service Technician
Category: Chevy
Satisfied Customers: 1
Experience: ASE Master Tech,over 20 years experience in GMC truck Dealer
Verified
41Modified and 87 other Chevy Specialists are ready to help you
Ask your own question now
Customer reply replied 10 years ago
No, the harness is ok although I remember it snagging the transmission as I was removing it. Looks like the oil pressure sensor is the most likely to have recieved undue tugging when that happened.
ok did you double check the bolts and studs that hold the bellhousing to the engine block? there is at one that is used as a grounding point for the engine harness, also there should be a bolt that is used as a grounding point on the back side of the left head...make sure all those wires got reconnected also...you might also want to take a close look at the pole piece on the distributor shaft(the star shaped part that rotates inside the pick up coil...look at the 4 rivets on the pole piece and check for cracks around them, this allows cross firing inside the dist cap...if there are, then the entire distibutor shaft will need to be replaced...let me know ....
Ask Your Own Chevy Question
Customer reply replied 10 years ago
2 ground wires on rear of right head weren't disturbed. Didn't find another at bellhousing bolts, just harness tabs on 2. The 4 rivets and the pole piece look good.
can you check the terminals inside the connectors on the 2 wire harness that runs from the coil to the dist module, make sure they are clean and not stretched or deformed...also there should be battery voltage on the red wire at both sides of the coil and at the dist connector with the key on...
Ask Your Own Chevy Question
Customer reply replied 10 years ago
Reply to 41Modified's Post: Have 12 volts on both red wires at coil, haven't checked connections yet. If I were to run a jumper to the red input on the coil would that effectively bypass the harness, sensors and computer and let me know if the coil and distributor related parts were the problem or not?

you could try that bypass but it might not help in determining the problem...the spark is controlled by signals from the pick-up coil, dist module, crank sensor,engine computer,etc all working together... you must have removed the distributor to replace the pick-up coil,make sure you put a thin layer of dieletric grease on the bottom of the dist module when you put it back together, also be sure the clip that holds the pick up coil in place is fastened securely on the shaft housing,and please double check the timing and firing order...

Ask Your Own Chevy Question
Customer reply replied 10 years ago
Reply to 41Modified's Post: I'm going to give you a day or so off while I do your sugested steps. And check everything again. You've already earned your $ and I'm going to attempt to send it now. How can I get back to YOU for more details if needed?
Thank you for your generosity! I will also be away this weekend, not returning until late Sunday nite.I'm sure that working together we will get this problem figured out and repaired. I am new to this board so I am not real sure how to get back in contact but i will find out tonite and let you know. Enjoy the weekend!
Ask Your Own Chevy Question
I have added you to my JustAnswer buddy list and you wil be able to contact me using the PM feature at the top of the page...talk to you soon
Ask Your Own Chevy Question
Customer reply replied 10 years ago
Reply to 41Modified's Post: Got it to run again and found light pressure on 4 prong module connector into distributor killed her. Replaced that and she seems allright again. Will drive her a bit and see if dependability has returned. Sure hope so!! When i reinstalled the distributor after replacing thepulse coil I simply put it back at the previous mark and figured the computer would make fine adjustments as necessary. I did put my 70s vintage inductive timing light on her today and couldn't ever see the timing mark... but I never got into a position that was even marginal for viewing. Is there some sort of timing light that clips to the tube at the timing tab?
HelloCustomer..Hearing that you got the engine running again is great news! Your timing light should be ok to check and reset the timing, just remember that the 'set-timing' connector (a single tan wire with a black trace stripe, usually visible on the harness near the distrubutor) has to be disconnected while setting the timing, set the timing at 0 degrees, turn the engine off. Reconnect the the set-timing plug and when you resart the engine the computer will take over the spark control and timing functions. I realize that visibility is limited near the timing marks so you should try to find a way to be able to see down there. That tube on the tab is used at the factory, when they set the timing they use a probe that fits in there to read the timing, a very expensive and impractical tool for most people since it would be almost impossible to use once the engine is installed in the vehicle. Thank you again for your patience and generosity and I look forward to hearing from you again.
Ask Your Own Chevy Question
Customer reply replied 10 years ago
Reply to 41Modified's Post: I found a tan with black trace wire going to the 4 wire connector at distributor, but not a separate connector for just the one wire. The whole 4 wire connector at the module wouldn't be the proper alternative would it?? This vortec engine is an unusual throttle body version.
Hi again! Yes,the tan wire with the black trace stripe is the one that the computer uses to control timing functions, but it usually breaks out of the harness wih a single connector. Unpugging it at the dist module really isn't an option here, the other wires are needed by the computer. I'm going to have to do a little research and find out exactly where it will be located on your truck. Usually it's near the dist, but i have seen some that are located under the dash, just below the glove box area...I will be in and out over the weekend so it may take a day or so before i can get back to you... The TBI Vortec engine is a little strange...can you check the 8th digit of the VIN and let me know what it is? (should be W or Z)
Ask Your Own Chevy Question
Ask 41Modified Your Own Question
41Modified
41Modified
41Modified, Auto Service Technician
Category: Chevy
Satisfied Customers: 1
1 Satisfied Customers
Experience: ASE Master Tech,over 20 years experience in GMC truck Dealer

41Modified 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 was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money.

Todd LRochester NY

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

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

GM Tech (Cam)

GM Tech (Cam)

Chevy Technician

15,289 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

9,357 satisfied customers

15 years GM master tech

Tim&#039;s Auto Repair

Tim's Auto Repair

mechanic

8,866 satisfied customers

Have owned a repair shop for 25 yrs.

Dave Nova

Dave Nova

Chevrolet Technician

7,092 satisfied customers

ASE Master Certification. GM World Class Certification

John

John

Master A.S.E Automotive technician

4,071 satisfied customers

A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician

Don - Mo Lurch

Don - Mo Lurch

Auto Mech / Electronics

2,918 satisfied customers

Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

Ron Z.

Ron Z.

- Chevy Tech -

2,734 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

< Previous | Next >

Related Chevy Questions
1989 5.7 liter throttle body engine. I was driving, engine
1989 5.7 liter throttle body engine. I was driving, engine was running fine, and came to stop sign. Upon trying to accelerate from the stop, the engine would hardly run. Bad miss and backfire visible … read more
rpmdiag
rpmdiag
High school
7,267 satisfied customers
1998 blazer takes longer to start when the engine is at
1998 blazer takes longer to start when the engine is at normal operating temperature after it's been off about 5 minutes or more. Starts up like new in the mornings after the engine has cooled down al… read more
Toyota Service
Toyota Service
Toyota Dealership Service & CR Manager
1,344 satisfied customers
Replaced the thermostat and display still shows up engine
replaced the thermostat and display still shows up engine hot ac off. i was told there is a way to reset it from the cluster. … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,357 satisfied customers
I'm having issues with idling and stalling. Check engine
check engine light on yes. stall at idle only. I just replace the ignition control module and code p0300 has gone off but the same symptoms exist now it gives code p0106 … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
Engine idles high when cold and then pulsates for a while
engine idles high when cold and then pulsates for a while until it warms up … read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
How do I determine if the engine temperature sensor is
how do I determine if the engine temperature sensor is working properly in my 2005 Chevy Venture. … read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
2008 Chevrolet Tahoe. Intermittently the engine will not
2008 Chevrolet Tahoe. Intermittently the engine will not crank. I found if I wiggled the negative cable it would start. I have changed the battery and the Negative cable assembly but the problem has r… read more
roy
roy
Associate Degree
3 satisfied customers
1995 Suburban K2500 with 7.4L engine here. There is a loose
1995 Suburban K2500 with 7.4L engine here. There is a loose wire, dark green with a white stripe, running next to auxillary fan switch wire (light green). Right now it's not connected to anythimg, jus… read more
heavy_chevy_396
heavy_chevy_396
Vocational, Technical or Trade Scho
2,518 satisfied customers
The reduce engine message and the engine light on and alot
the reduce engine message and the engine light on and alot if shacking when I started it this morning … read more
Jared D
Jared D
Shop Supervisor
Bachelor\u0027s
3 satisfied customers
The engine shuts off, and its service traction control
the engine shuts off, and its service traction control popped up on the dash.. … read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
Check engine light not on with key on, Not on alt all with
Yes -performed tuneup replaced all sensors except knock … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Engine is running 240 degrees and not holding water/anti
engine is running 240 degrees and not holding water/anti freeze and heater is not working … read more
Edward Clayton
Edward Clayton
Associate Degree
1,033 satisfied customers
Check engine light on engine hot ac off message. Stay on.
check engine light on engine hot ac off message JA: Does the light stay on, or does it blink? Customer: stay on JA: What is the model/year of your Chevy? Customer: impala 2006 JA: Are you fixing your … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
I have a 2013 Tahoe with 5.3 engine. The service engine
I have a 2013 Tahoe with 5.3 engine. The service engine light comes on when the temperature drops below 45 degrees. It will go out when the temperature is above 45 or 50 degrees. The code it sets is P… read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
Check engine light is on... It spudders at an idel. And
Check engine light is on... It spudders at an idel. And sometimes doesnt start .. … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
The engine and traction control lights are on, and there is
The engine and traction control lights are on, and there is a "service traction" message on my 2011 Malibu. … read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
86 K10 temp. gauge goes to hot and engine dies, but engine
86 K10 temp. gauge goes to hot and engine dies, but engine is still cool … read more
heavy_chevy_396
heavy_chevy_396
Vocational, Technical or Trade Scho
2,518 satisfied customers
1996 chevy Silverado k2500 5.7 vortec engine engine light on
1996 chevy Silverado k2500 5.7 vortec engine engine light on po300 random misfire detected we replaced plugs wires Distributor cap and rotor pickup coil checked compression everything is good there ch… read more
Michael Solis
Michael Solis
363 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