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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Dec 2005 Posts: 1,026 'Bolter | | 'Bolter Joined: Dec 2005 Posts: 1,026 | Fuel injection is awesome when it works as it should, but aggravating an heck when it doesn't. I'm having some issues with my TPI setup. To start off, #1 & #2 cylinders were not firing. I rented a noid light from Autozone to make sure it wasn't the harness and everything checked out but now it wont even start. I verified that the distributor is firing but is there a way to check to see if the ECM is dead? If this keeps up I may slap a carb on it and call it done!!
Robert C. If it's true what they say, "You learn from your mistakes," I'm a Genius in the making. 1950 3600 | | | | | Joined: Jul 2009 Posts: 21 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2009 Posts: 21 | Test everything between the injector and fuel/signal source before you oust the component itself. to test the signal at the ECM just needs a voltmeter. look up what the signal voltage is and test at both ends of the harness. DO NOT USE A TEST LIGHT ON YOUR ECM. it can cause it to burn up because there is no regulator on a test light. if you have tested all other components and they all check out it is possible your ECM is malfunctioning.
Yes this is my truck, No I wont help you move
| | | | | Joined: Aug 2007 Posts: 1,859 Grumpy old guy playing with trucks, cars, and boats | | Grumpy old guy playing with trucks, cars, and boats Joined: Aug 2007 Posts: 1,859 | Robert,
The TPI is batch fire (firing left bank, then right bank...). If it is fuel related, it is most likely either harness or the injector itself (swap the injectors to determine). Spark should be easy enough to determine with a spark tester.
Did you have it running prior? They wont run with the distributor 180 out (dont ask me how I know)
Depending on the year, you should be able to plug in an OBD scanner, or simply ground out the MIL and read the codes.
The problems we face today can not be addressed at the same level of intelligence we were at when we created them - Albert Einstein Or with the same level of $ - Me
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