Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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Your saying the engine cranks over but starts hard or does not start? Is that correct?
Does this happen all of the time or just when cold/warm?
Thank you for that information.
Have you checked for spark when this occurs?
Is the check engine light on? Are there any codes in the computer?
Have you checked the fuel pressure when this occurs?
Ok so it sounds like there are a few things that need to be addressed..
The fuel pump could be bad.. and this is VERY common on these vehicles. This would need to be at least checked and or ruled out first.
The TPS signal voltage is a bit low as well. You might want to double check this signal and replace the TPS as needed.
You are going to want to check the primary ignition system and secondary ignition system along with checking for power at the ignition coil with the key on and cranking when this happens to ensure we dont have low voltage causing this orange spark.
Also, checking injector pulse using a noid light would be a good idea as well.
If there is no power to the fuel pump, the fuel pump will not work and the engine will not run.
I would recommend to check for power on the power supply wire going to the fuel pump just to be sure your reading is accurate.
If so, power up this wire manually and see if the engine will start and run.
If so, we can pull a wiring diagram of the fuel pump circuit and trace down the root cause of the power loss issue..
Would you like a wiring diagram of the fuel pump circuit?
What is the fuel pressure at?
You can hook up a fuel pressure gauge in line between the throttle body and fuel pressure line. I have done it more times that I would like to admit.
IF you dont think it is a fuel related issue, then you would need to check spark when cranking to ensure it is night blue and it can jump a half of an inch of a gap.
Based on my experience, I dont think this is the issue.
But if you would like to persue it, then you need to check the ignition coil/module and power to the primary ignition system.
Maybe we could talk on the phone? It might be easier that way..
Does not matter. I have seen bad new parts right out of the box. In fact, just had a customer with this problem. Bad new part.
YES Sir! That is possible! If the ignition switch were faulty, the ignition coil/module would have low voltage, so your going to want to check this and verify this is the case before replacing the ignition switch.
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