ENGINE LIGHT CAME ON, THEN AFTER SHUT OFF WOULDN'T START UNTIL AFTER AN HOUR OR TWO
1994 Chevrolet S-10
May, 18, 2012 AT 12:47 AM
I have a 1994 S-10 new body style pickup with V6 4.3L vortec.
Same problem when got home. Now, it starts fine?
I was driving to the bank and pickup ran fine. Half way there, the engine light comes on but I notice no other issues. Still ran great. Got to the bank, was going to leave it run but I shut it off instead to save fuel. It would crank all I wanted but not fire and you could smell plenty of gas. After about 15 minutes I tried some more, it fired for about 15 seconds but died. Had friend come down to pick me up and after hour and a half we went back and it fired up. I decided to get home before something happened. Engine light came back on after about 30 seconds, but it still ran and I got it home. Shut key off, and after that would not start.
I have not done anything to the pickup at all except check wiring and make sure there was nothing loose or unplugged. But, after it has been at home, it keeps running no matter how hard I drive it and it keeps starting. I cannot recreate the problem so I do not know if it fixed itself or what the problem was.
The distributor was replaced about 30,000 miles ago, so was the alternator, ignition control module, ignition coil, battery, yeah, everything went to hell at the same time a couple years ago.
But this problem has me not trusting my truck to take it anywhere. Where should I focus my search? What is capable of causing an intermittent no-fire situation? I am suspicious of the security system though, and with help of the locksmith I will have it removed completely.
Also, my trouble codes will not flash manually nor with a code reader of any kind, brand or what not. Is there some part of the diagnostic circuit that could have went out that I should check/fix? I would very much like to see what the computer has to say.
I would start with a fuel pressure test when it does not start. It needs to be around 55-58 lbs.
Check for spark as well. It should be a crisp spark.
Lastly, the computer is a common failure when hot on those gms. Try tapping on the computer while it is running and see if it faulters or stalls.
May, 18, 2012 AT 1:58 AM
Well. Engine light came back on, finally. But it will start. Sometimes it will sputter and pop at an idle. Other times I shut it off and start it back up it will idle smooth but start bogging down and popping when I give it some throttle. So. Is it most likely the computer? Yeah its got plenty of fuel. I forgot to mention it is TBI.
The plugs are heavily carboned up now. And one sensor on the side of the engine has a broken top, and when I pull the lead out the light comes on but no change in engine performance. I put lead back, light goes out but again no change in performance. Not sure what sensor it is, facing the engine it is on the left hand side just above the spark plugs. There are many issues to be resolved I just don't know how related they are to my current problem. However, with the light on now, messing with that broken lead doesn't make the light go out. So. It definitely has to be some other problem. I hate to think it is the computer But I will give it some good taps and see if it does anything.
About the only thing on the truck that has not been replaced is the computer.
May, 18, 2012 AT 2:01 AM
I would assume nothing. What is the exact fuel pressure? I would have the sensor looked at by a shop to identify what it is and what needs to be repaired.
May, 18, 2012 AT 2:04 AM
We have a 2001 jimmy with a 4.3 vortec that cracked it's block, would the computer from it work on my S10?
May, 18, 2012 AT 2:12 AM
No, it is obd 2 and is totally different.
May, 18, 2012 AT 2:19 AM
Ohhhhh yeah, I forgot about that. Well. I will see if I can round up a new computer. Nothing I mess with has any impact on what is going on with the operation of the engine and given the age it wouldn't be unexpected the computer is having a failure of sorts. Thanks for the help!