No Spark - 4.3L S10 Pickup

90

Asked by Apr 22, 2014 at 10:40 PM about the 1996 Chevrolet S-10 2 Dr LS Extended Cab SB

Question type: Maintenance & Repair

The engine stopped while I was driving down the highway at 60mph.  I could not get it to restart.  Had a tow-truck take us home.
Using the Hayne's Manual Diagnostic Flow Chart,
I tested for: spark at the plugs - No Spark
spark at the coil wire - No Spark
test the Coil - results all positive (the coil is new)
Check voltage at terminals A & D of the Ignition Control Module -
>10v at A,  <10v at D (This is the problem) The ICM is new also. I have also replaced the Coil Wire, Cap & Rotor. The Crankshaft Postion Sensor tests fine. (Alternating 5v pulses) There is also >10v going to the coil at its terminal A.
The grounds are good at the coil and ICM.
There is good continuity at the white wire w/black stripe between coil and ICM.
These results led me to believe the PCM was at fault, so I replaced it too.
It still will not start.

The first time I tested ICM terminal D, it gave a reading of >10v.
Since the replacement of the PCM, it shows <1v at terminal D. This is still a No Spark condition. Last summer I replaced the fuel pump & filter, the spider fuel injection assembly, and the heads. All with new gaskets. It has been running like new, until this. I have not replaced the Ignition pickup coil (camshaft position sensor). Could this be the cause of the low voltage reading at terminal D?

8 Answers

56,575

Ignition switch? Wiring at the starter? That's where I'd look next. HTH. -Jim

2 out of 2 people think this is helpful.
18,485

sounds liker high resistance ,poor ground or frayed wire somewhere

3 out of 3 people think this is helpful.
90

Thank you Jim and Jimmy. I think I've found the solution. It seems to be in the connector to the Ignition Control Module. The White wire w/black stripe from terminal D on the ICM to terminal C on the Coil shows enough continuity to light an led test light, but a test with a multi-meter shows a significant drop in voltage. I'm going to see if I can temporarily bypass it. If that works, I will get a new connector. Jim, one of the tests for the ignition switch is the same as for checking voltage at terminal A. I have >10v there. I'll let you know how it goes.

4 out of 4 people think this is helpful.
56,575

You're welcome. Glad to help. Yes, please do. -Jim

1 out of 1 people think this is helpful.
90

On the road again. It was a bad connector that caused me grief. I replaced the connector to the ICM, but still had a no-spark condition. So I started re-testing, which took me back to the coil. The coil tested fine, the problem still seemed to be with the coil driver wire (white w/black stripe). I pulled everything out of the conduit and could not find any visual signs of damage. I got (false) positive readings for continuity. There was just enough contact for that reading, however I still had significant voltage drop. I replaced the coil primary circuit connector, and I am a happy man again.

4 out of 4 people think this is helpful.
56,575

Awesome! Thanks for letting us know. Very glad you're back on the road! -Jim

Question? How did you bypass the ICM? Is there anyway to bypass all these sensors?? Im beating my head against a wall with the dumn things.

90

Hi Brandie, I didn't bypass the ICM. I bypassed the connector by connecting the wires directly to the ICM terminals. That was how I knew it was the connector itself. I wired a new connector in, and it's been running fine for the past year and a half. I don't think you can bypass the sensors, as they all play a part in the proper functioning of the engine. I used the diagnostic flow-chart in the Haynes manual to systematically test each component, and continuity of each wire. It took a lot of time. Good luck.

1 out of 1 people think this is helpful.

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