Question about 2003 Chevrolet Impala
Well, if you are stuck with this, I'd begin by getting a chiltons manual (haynes is weak on diagrams). There are individual component tests you can do using a digital volt / ohm meter listed in the manual. It sounds a lot like you have an intermittent poor connection somewhere I'd do "wiggle" tests on harnesses and check all ground points to make sure everything has been tightened and connected. Testing while the engine is running can be a good idea as when it stalls, you can again test and see if any particular connection that had power does not. When checking connections, always look inside the connector and verify that no pins are bent or pushed back into the plug. Also check any wires that run near the parting line between the engine and transmission as sometimes they can get pinched between and short out. As for the coils, they may be bad, or, they may not be installed correctly. The manual will give install instructions as well as testing parameters. The problem may not be in the coils but in adjacent wiring that may have been moved while removing and installing them so check carefully all around that area. Using the schematic as a guide, you can check wiring from origin to destination without opening the harness. To do that, disconnect the battery and use the ohmeter to check for continuity and also for ground faults. There are many wires to test so I recommend using a notebook and recording the test results. This may begin to give you a "picture" of what is going on there.
As I mentioned, people can do things that the vehicle could never do to itself. Problems such as yours can turn into projects that can take many hours to solve. It's not impossible, it just takes time the dealer does not have.
I wish I could give you an instant diagnosis but having done many jobs just like the one you are facing, I know it isn't fun.
Good luck...stay with it and you will find the answer.
Posted on Oct 06, 2010
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Posted on Jan 02, 2017
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