Can the ignition control module on a 1997 Chevy S-10 be tested on a testor , be passed as OK and still be failing when installed on the engine?

Asked by Oct 04, 2014 at 05:10 PM about the 1997 Chevrolet S-10 2 Dr LS 4WD Extended Cab SB

Question type: Maintenance & Repair

Truck would  start, but would not run when throttle was opened.  Replaced fuel pump, Pressure regulator,and filter.  It started right up, responded to throttle just fine, and I took it out for a test run.  2.5 miles down the road, it died and when I started it again, it would not accept throttle and died again. I started it again with the same results.  Towed it home, disconnected the fuel line at the filter, checked filter and fuel line for obstructions and found everything open.  Fuel pump comes on and engine starts but will not accept throttle.  apparently, something is interfering with the fuel pump continuing to run causing inadequet fuel pressure. Checked the pump relay, but the relay is fine. I suspect the ICM, so I had it tested.  I think the tester briefly indicated a failure but then moved on to the passed position.  Can the ICM be passed as OK and still fail when installed on the engine?

2 Answers

109,965

Do you have a check engine light on? If so the code stored would be the best place to start with diagnosis. To answer your question about the module is yes it can test good, run for a little while then go bad, but you have to catch it during failure to be100 percent certain.

815

Another thing to check is the mixture of Air/Gas Ratio and or Vacuum Leaks can cause it to Bog Down. Let us know what you find, ok?

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