1994 S-10 P/U Dies

Tiny
YURTLE
  • MEMBER
  • 1994 CHEVROLET S-10
I have a 1994 Chevy S-10 P/U 2WD with a 4.3 liter Vortec engine with 115,000 miles. It's recently started dying while driving. Sometimes it would start right back up. One time I had to tow it home. I replaced the fuel pump when it died about five years ago. I've had recurring EGR valve problems, but the latest one seems to be OK. I get good fuel pressure, and have no codes showing. Last weekend I replaced the whole injector unit and the fuel filter, and that seemed to fix the problem. It never ran better. It has since started dying again. Any ideas?

thanks
Adam
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Wednesday, August 22nd, 2007 AT 6:14 PM

8 Replies

Tiny
SERVICE WRITER
  • EXPERT
Don't let "nasty ol Techman" bother you, he's been a little testy latley.

Have you rechecked the fuel pressure since the problem sterted acting up again? You may need to extend the fuel gauge to the windsheild and monitor it when the problem happens. It may not be a fuel pressure problem, but need to start somewhere.

HAve you scrubbed out the air filter box?...only kidding :shock: :lol:

Peace.


http://www.2carpros.com/forum/automotive_pictures/30961_hippypeace_1.jpg

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Thursday, August 23rd, 2007 AT 5:18 AM
Tiny
YURTLE
  • MEMBER
I read every post regarding S-10 problems similar to mine, and felt that I gave an adequate description of the problem, and the status of various components. Most descriptions I read on other posts were horrible, but they weren't insulted. I also donated, but apparently not enough.

In a nut shell, I have a (relatively) new fuel pump, filter, EGR valve, and spider injector. I stated, "I've got good fuel pressure and no codes."

I've seen similar problems posted where folks were told to check their fuel pump, filter, relay, or oil pressure unit. I said pressure was OK, to keep you from wasting your time down that path. I also told you my EGR valve was fine.

I did fail to mention that when it is dead, I get spark and pressure. Fuel sprayed into the intake causes it to start. Can't check for injector pulse, unless I can somehow do that with a DMM.
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Thursday, August 23rd, 2007 AT 5:28 AM
Tiny
SERVICE WRITER
  • EXPERT
Easy, I'm trying to help.

I understand that you have fuel pressure. But again is the fuel pressure in spec when the problem is happening. That is critical. Too often, techs leapfrog over a basic source that they spin their wheels because of assumptions. I have seen a TON of fuel pumps fail that were "new".

I have not been insulting and that is part of the reason, I jumped in on this.

You can check the injector pulse with a noid light.

Not that I doubt your Donataion, but donors are signaled with a "HAVE DONATED" next to their ID.
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Thursday, August 23rd, 2007 AT 5:34 AM
Tiny
YURTLE
  • MEMBER
As to fuel pressure, I said I had "good" fuel pressure; not pressure. It's 60 PSI, and drops slightly when it revs up. If you read my previous post, you'll see that I stated that I have GOOD pressure and spark when it refuses to run. If you like, I can plot a pressure vs. RPM vs. Altitude for you.
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Thursday, August 23rd, 2007 AT 5:48 AM
Tiny
SERVICE WRITER
  • EXPERT
The site does resize pics BTW.

I didn't insult. Did I? IF I did I certainly apologize. Here is what I will do, I'm going to put a post in the moderator forum asking for more assistance.
I tried to clarify the fuel pressure situation.
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Thursday, August 23rd, 2007 AT 6:36 AM
Tiny
DR. HAGERTY
  • MEMBER
I have a GM car doing the same thing and finally tracked it down to the ignition module. If you are still getting spark and there isn't an injector signal then maybe there is a communication issue between the ECM and the ignition module. Mine was heat related, let the car run and after 10-15 minutes the car would die, there was spark but no injector signal, removed the ignition module and put into freezer, cooled and reinstalled then it worked. I know it sounds nutty but I've had this car for a while now and I have been able to repeat this process several times. Mine wasn't throwing any codes either.
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Thursday, August 23rd, 2007 AT 7:44 AM
Tiny
SERVICE WRITER
  • EXPERT
Thanks Doc, I knew I could count on you!
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Thursday, August 23rd, 2007 AT 10:31 AM
Tiny
2CARPROS MIKE
  • ADMIN
Hi Yurtle,
I see that you did donate, just like you said. Our system had a problem and it did not show your question properly marked as having donated. I am working on resolving this right now. Your donation is definetely appreciated. I have informed the Moderators that your question was marked incorrectly and to do their best to help.

We are here to help and I am sure we will help you too.
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Thursday, August 23rd, 2007 AT 11:42 AM

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