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David Gieswein
David Gieswein,
Category: Chrysler
Satisfied Customers: 71
Experience:  Automotive technician at Doug Gray Dodge/Chrysler/Jeep
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1996 town and country 3.8 raw fuel coming out exhaust went

Customer Question

1996 town and country 3.8 raw fuel coming out exhaust went through everything possible rechecked everything 3 times
Submitted: 4 months ago.
Category: Chrysler
Expert:  David Gieswein replied 4 months ago.

Hello my name is ***** ***** I can help you. It sounds like you have a leaking injector. Have you removed the fuel rail and pressurized it to see if any of the injectors leak? If you don't know the proper procedure, I can tell you

Expert:  David Gieswein replied 4 months ago.

I had the exact same issue on a 02 Nissan Exterra. Fuel was pouring out the tail pipe and muffler. I found two bad injectors that leaked every time I turned the ignition on.

Customer: replied 4 months ago.
no I have not how do you go about doing it
Expert:  David Gieswein replied 4 months ago.

Ok it is really not that hard. The hardest part is getting the fuel rail off and not letting dirt fall down into the intake

Customer: replied 4 months ago.
I have worked on vehicles for over 30 years never saw this problem before
Expert:  David Gieswein replied 4 months ago.

Me neither until this year. I am going to tell the easy way to diagnose which injector is bad

Customer: replied 4 months ago.
I checked resistance everyone was in specs
Expert:  David Gieswein replied 4 months ago.

You do not have to completely remove the injector rail. Just lift it up and out of the holes so you can see an leakage in the next step. Make sure that the injectors are all disconnected for this test! Once you have lifted them out of the holes, turn the key on to pressurize the injectors. You may need an assistant to help you while you observe the injectors for leakage.

Expert:  David Gieswein replied 4 months ago.

Resistance wont help if you have mechanical blockage

Expert:  David Gieswein replied 4 months ago.

I can almost guarantee you have a leaking injector. I even bet you have more than one leaking.

Customer: replied 4 months ago.
when you mean disconnect you mean pull the wiring connecters off
Expert:  David Gieswein replied 4 months ago.

Yes,disconnect the connectors to the injectors and leave the fuel line hooked up

Expert:  David Gieswein replied 4 months ago.

This should not allow them to be energized.

Customer: replied 4 months ago.
ok david going to do this tomorrow then I will get back to you Thanks
Expert:  David Gieswein replied 4 months ago.

Thank you sir. If this answers your question please don't forget to rate me either today or tomorrow please. Have a great day!

Customer: replied 4 months ago.
okie dokie
Customer: replied 4 months ago.
Alright David took plemum off and cylinders 4 5 6 cylinders according to firing order gas was level in the intake on those 3 when I pressurized the gas rail did not come out of those 3 injectors kept trying then gas started coming out 2 and 3 injectors the 3 injectors that didn't leak they must pull gas out of them when engine is cranking
Expert:  David Gieswein replied 4 months ago.

Sorry it has taken me so long to answer. I tried to get on the site but it wouldn't let me. It sounds like you have found some leaking injectors? Did you mean #2 and #3 injectors are leaking?

Expert:  David Gieswein replied 4 months ago.

I forgot to tell you that it is better if you can find the fuel pump relay and bypass it during testing. Make sure the injectors are unplugged. There should be no leakage at all from any injectors when you do this.

Expert:  David Gieswein replied 4 months ago.

Dear customer, if you no longer require my service, please rate me!

Customer: replied 3 months ago.
alright David I put new injectors in I had heart surgery a year ago so I am not as fast because mine affected memory and thinking should have told you this before I went and check everything 3 times and all is is in tact what its doing now you have to hold throttle almost to the floor for it to fire and strong smell of fumes and on the floor is black soot and all it does when you hold pedal almost to floor constant is putt putt
Expert:  David Gieswein replied 3 months ago.

Maybe the PCM is grounding the injectors all the time? The next step would be to verify the injectors are getting power and ground. With the key on engine off, take a regular test light and test each of the two pins of the injector connector. One of the two should light up your test light. Then, you will need to reverse polarity of your test light so you can test the adjacent pin which is computer controlled ground. To reverse the test light, simply put your alligator clamp on positive and your test light will now be able to test ground. While cranking you should see a faint pulse from the test light as this would indicate that the PCM is indeed trying to fire the injector.

Expert:  David Gieswein replied 3 months ago.

I was just thinking, you said you had a smell of fumes. This would indicate fuel is getting into the cylinders. Maybe the problem is that you are not getting fire. Remove a plug wire and check for spark. What brand of spark plug are you using?

Customer: replied 3 months ago.
checked each plug wire and fire is at everyone champion I will check the the power and grounds to the injectors and get back to you
Expert:  David Gieswein replied 3 months ago.

That's good. Champion is what is recommended. On the injectors, check for power but specifically focus on the ground. I believe you may find a constant ground which would explain the flooding. It is possible you could have a bad PCM.

Customer: replied 3 months ago.
put reman pcm in but it could be bad
Expert:  David Gieswein replied 3 months ago.

It is possible, but not likely if the supplier is reputable. I reputable supplier has ways of verifying the PCM's integrity and software.

Expert:  David Gieswein replied 3 months ago.

I need more information. Especially how the ground side of the injector is performing. If the ground side is constantly grounded, there may be a short to ground in that circuit. You will need to check each individual injector's ground circuit as they are each individually grounded by the PCM.

Customer: replied 3 months ago.
ok will do
Expert:  David Gieswein replied 3 months ago.

Take your time sir, I understand it may be difficult for you at times. I will be patiently waiting and I will be checking back here from time to time to see if you have replied. I will be in Nissan training this week in Dallas so a quick response from me may not be likely. However, I assure you that I will respond. Have a good week.

Customer: replied 3 months ago.
ok David dark green and orange turn key on test light lights for a second then goes out when cranking light stays on now the ground pluses when engine is cranking
Expert:  David Gieswein replied 3 months ago.

Did you check for pulsation on all the injectors or just one?

Customer: replied 3 months ago.
All had pulsation
Expert:  David Gieswein replied 3 months ago.

Can you check the cam/crank sensor sync status? You will need a better than average scan tool to do this.

Customer: replied 3 months ago.
I am going to see if I can borrow good scan tool better than what I have I didn't mention this sometimes when I try to start it it will backfire through the throttle body it acts like the timing is not right going to check the wiring from the sensors to the pcm to see if theres a bad or broken wire I have checked everything else
Expert:  David Gieswein replied 3 months ago.

That is why I recommended checking the cam crank sync relation. If they show out of sync, you got timing issues. I really don't think you have a bad cam or crank sensor because you said you are getting spark and fuel. The sensors just relay where the piston or cam is to determine firing time. If they are out of sync, they will inject and fire at the wrong time. A compression test can also be performed to determine if you have timing issues. However, this method is more involved and lengthy.

Customer: replied 3 months ago.
allright david found the issue I get thinking it was a timing problem but the thought it it was in the sensor circuits but this is something I never saw happen in my life the camshaft broke in half
Expert:  David Gieswein replied 2 months ago.

That is crazy, glad you finally found the issue. Never seen that happen either. If you no longer need assistance please rate me! Thank you.

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