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1992 Chevy S-10

Tiny
PARMAN440
  • MEMBER
  • 1992 CHEVROLET S-10
  • 6 CYL
  • 2WD
  • MANUAL
  • 90,000 MILES
My s10 has a 2.8 v6 throttle body.
It is backfiruing and sometimes stalling.
I have put new cap and rotor, plugs/wires, EGR valve and solenoid, cat, O2 sensor, Maf sensor, coil, fuel pump, fuel filter.
I had inadvertantly tried to start the truck while I had the jumper in to check trouble codes.
What is the liklihood of me damaging the ecm by doing so?
Is there a way for me to test the ecm or do I have to have it check at a dealer or repair shop?
I do not want to spend another 100.00 on an ecm just to find out that is not the problem.
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Friday, October 1st, 2010 AT 5:21 PM

9 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the ignition timing and fuel pressure
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Friday, October 1st, 2010 AT 6:34 PM
Tiny
PARMAN440
  • MEMBER
  • 8 POSTS
I replaced the ignition control module and the fuel pressure is good.
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Friday, October 1st, 2010 AT 6:48 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
What was the fuel pressure? You sure the wires are not leaking, and also the firing order correct-could also be a lean or rich mixture
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Friday, October 1st, 2010 AT 6:54 PM
Tiny
PARMAN440
  • MEMBER
  • 8 POSTS
I am not sure what the pressure was.
The fleet guy at work checked it and said it was okay.
I had a code that said it was running rich before I put the O2 sensor in.
So you don't think I could have done anything to the ECM by trying to start it with the jumper key in place to check for trouble codes
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Friday, October 1st, 2010 AT 7:03 PM
Tiny
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  • MECHANIC
  • 75,992 POSTS
Probable causes of an engine running rich are as follows:

1. Excessive fuel pressure can be cause by restricted fuel return line or defective fuel pressure regulator.
2. Defective Oxygen Sensors.
3. Leaking injectors and fuel pressure regulator.
4. Coolant temperature sensor out of calibration.
5. Restricted air intake system.
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Saturday, October 2nd, 2010 AT 5:48 AM
Tiny
PARMAN440
  • MEMBER
  • 8 POSTS
New fuel pump, oxygen sensor was replaced.
That seemed to take care of the truck running rich.
That trouble code never came back.
My main question is this.
Could I have done something to the
ECM by trying to start it with the trouble code jumper key in place?
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Saturday, October 2nd, 2010 AT 6:27 AM
Tiny
RASMATAZ
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It won't do any harm to the PCM -
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Saturday, October 2nd, 2010 AT 10:26 AM
Tiny
PARMAN440
  • MEMBER
  • 8 POSTS
So I can rule that out?
Someone said something about the tps (throttle position sensor.
I was gonna pull the temp sensor and check that.
Another forum said that there is a coolant temp switch as well. How do I check that or is that not realevant.
The parts guy at O'reillys also said something about a smog pump. Could that be a problem?
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Saturday, October 2nd, 2010 AT 10:58 AM
Tiny
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Could be the air injection pump diverter valve when it backfires during deceleration also check the check valve-
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Saturday, October 2nd, 2010 AT 5:22 PM

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