Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hello and welcome! My name is ***** ***** I can assist you with your question. I am confident that if you stick with me we will get to the bottom of this problem.
At any time feel free to request a phone call as we can then speak over the phone as that will go much faster.
I am going to start by asking you a few basic questions. Do we know what the fuel pressure is at? Any codes in the computer?
I have a great way to go about diagnosing this sort of condition. It would be best to explain this over the phone.
Ok and do you know what the fuel pressure is at under a load? What about the oxygen sensor reading under a load?
Excellent. Please provide specs for me so I can help you pinpoint the problem.
Ok, do you know what the dead head fuel pressure is at? Have you done this yet?
YES I did
I hear you loud and clear. We must do some testing to pinpoint this problem.
Would you be willing to speak on the phone for an extra $5?
I think your barking up the wrong tree. I wont be able to help you without speaking to you over the phone. I will leave this question open for other experts. Good luck.
If you could tell me the color wire or wires that you move to get it to run better, I might be able to help.
I am a bit confused by all of the typing. I only asked for the wire colors that you wiggled to temporarily fix the problem, so I could see if I could find them in a wiring diagram.
But since you mention all of this and it appears that you know where some of them even go, perhaps disconnecting them to rule them out until, you are left with just the wire colors that fix the problem, then give those wire colors to me.
If it were me I would just replace that section of the harness.
can you possible recognize any of those plugs in this picture?
You are going to have to narrow it down and pinpoint just one wire, one part, in order for me to help you.
I believe your ecm is there behind the glovebox, I would assume that is the problem with one of the wires going or coming from it and it's bundled together with one of those harnesses under the dash that you are wiggling in order to get the problem to get better or worse. What I suggest you do is cut and remove any wire-ties, straps or whatever holding those harnesses together and plan to replace the harness going to the ecm, so then remove all of the wires from the harness covering and expose them, then wiggle each wire one at a time or one plug, one at a time and find out exactly what/where the problem is, then give me a wire color or a part number, plug number or what ever.
Check these harnesses and plugs at the ecm,
And here is a wiring diagram showing the wire colors to the ecm,
So you say this has no power from 0 to 40 mph after it warms up/
At first I would assume maybe a faulty coolant temperature sensor, but since wiggling wires does get it to run better, I changed that thought to that tan/black or tan/white wire that you unhook when adjusting the ignition timing. I believe in runs somewhere near where you are wiggling and the wire overrides the ecm from adjusting the ignition timing, so I wonder if it's loose or making a bad connection or even partially/intermittently shorted.
I also see the torque converter clutch resistor in that area of the ecm and that harness plug along with the blower motor which would be connected in somehow to the ac/heat control panel, which you said you were wiggling wires near.
What color was that "mode select motor wire".