Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hello and welcome! My name siCustomerand I can assist you with your question. Can I start by getting your VIN? Thank you!
Hello and good morning! Sorry for the delay! Thank you for the VIN. Before we dive into this, we you checked the fuel pressure when this happens?
The fuel pressure should be between 9 and 13 psi. Keep in mind, that I have even seen it where the pressure is within specs but the volume is low that is why you need to pinch off the fuel return line to check the deadhead fuel pressure. It should quickly increase past 15 PSI and it should stay 15 PSI under a load. If fuel pressure will not increase, check the fuel filter and check power/ground to the fuel pump and replace the fuel pump as needed.
No, this system is not supposed to hold pressure with the key off.
See if the engine runs better on alternative fuel when this happens.
Didn't you pay your mechanic to diagnose it?
If so, what was his diagnoses?
Did he charge you to do this?
Thats very nice of him. Did you watch him do this test?
YES, I have lots. BUt you need to run the test so we can narrow it down.
Spray a small amount continuously
Hello! So did adding starting fluid to the intake help?
I got that reply. I am looking for a yes or no answer.
I still think its the fuel pump.
I agree. I would not either if I were you. Have you mechanic take a video of this fuel pressure gauge showing the correct specs WHEN this happens and send it to me. I will be waiting.
Hello! I was not able to open the file. Are you able to post it to youtube and send me the link?
Thank you for the Video. Looks to me like you have a bad/weak fuel pump. :)
This is what the fuel pump does when it starts to go bad.
YES, you can clamp off the return line and watch the dead head pressure like I mentioned earlier. However, you would have to perform this test WHEN the problem occurs (when the engine is first started when cold) or you can use a lab scope to watch the pattern
There should be a rubber part of the return line from the throttle body that you can clamp it off.
Ok, then you wont be able to run this test.
Replace the fuel pump
I dont access to that information at the moment
Ok, excellent! Thanks for the update. Please run the same tests/steps we have been talking about and take another video for me so I can see what is going on. Thank you
Hello! The TPS can do this but not the IAC.
It should only have one oxygen sensor before the cat.