Envoy 2000 Nightmare Problems

[Envoy2000]

Hi all, this is my 1st post, I hope someone can help me with these nightmare issues I have with my 2000 Envoy.

 

Here we go:

 

1. When I turn on my truck, my gauges do not work right away. I have to roll a couple of kms, and then they start working again, but sometimes they just never come back on.

 

2. When I start my truck, and start driving, my truck starts popping from beneath the truck or hood, not to sure, but it feels like a backfire. The pedal is to the metal, and the truck very slowly accelerates to desired speeds. When I am on the road or highway, the trucks RPM seems as if it was stuck in 3rd gear.

 

3. When I turn off my truck, my key stys stuck in the ignition. I have to remove the ignition cover and press the release button to remove the key everytime...people think I am stealing my own truck, it's getting embarrassing!

 

4. My heather does not work when my gauges do not work, but as soon as the gauges restart working, the heater starts as well.

 

5. Today, my head beams (lights) stopped working. I only have my parking lights functioning.

 

This is what my mechanic did to try to solve the problem, but to no avail:

 

1. Replaced fuel pomp ($700)

 

2. Change ignition system completely with used one, not new ($500)

 

3. Fuel filter changed ($75)

 

4. Change battery to 700 AMP one. As soon as I installed, everything was working like new, but one tour around the block, and problems came back.

 

Result:

 

I am going crazy!!!

 

I have tried 5 other mechanics, and they all said: "I am not touching your truck, go to the dealer".

 

 

Can anyone help me out??

[gmtech4]

are we now learning that dealers know your truck better than corner garages do ?

 

tell me you didn't pay that butch

 

not 1 code pulled or mentioned ?

 

now all your money is gone for a real *&*&^% 'in diagnoses

 

tell us or all your friends not to go to that idiot.

 

now I'll tell ya ,take it to the dealer

[wild willy]

Sounds like an intermittent electrical problem to me-- Battery terminals tight? Corrosion on some of the grounding straps?

 

Can be a real bear to locate and diagnosis- when you test a circuit it may be(intermittently) working.... good luck-

[68haywagon]

4. Change battery to 700 AMP one. As soon as I installed, everything was working like new, but one tour around the block, and problems came back.

 

This right here makes me think the alternator my not be putting out enough power. On the cheap if you think you can do it, pull it out and take it to an auto parts store. They usually have a bench tester and do it for free.

 

If that don't work, take it to someone who actually knows what they are doing...like the dealer.

 

Mike

[Envoy2000]

Connections on the battery are tight.

 

I am not going back to that garage ever.

 

Other forums have suspected the Mass air flow sensor, maybe the PCM...

 

 

If I go to the dealer, do I make them search or tell them what has been done?

[AlenWoods]

Alternator.

[Envoy2000]

I noticed that when I put the key in the ignition and turn the key just before it starts and then press the shifter button, all my gauges come back on, but when I turn on my truck, the gauges turn back off.

 

Can there be something with the transmission cause I had it replaced with a rebuilt one 3 years ago, and they told me that there was a code that appeared when they reinstalled it: p0101

[Envoy2000]

Now my radio, and head lights do not work anymore...I checked the fuses and they were burnt. Change them and all is fine.

 

Could this be a ground issue?

 

I have an appointment with the dealer in 2 weeks, these guys are busy.

[MitchFromPEI]

Sounds like your having electrical/grounding issues. And your computer is in "limp home" mode. Get a schematic a multimeter and start testing!

[Envoy2000]

I went to get my alternator bench tested, and it was fine.

 

Ground issue a possibility.

 

Because when I changed my ignition cylinder, the truck worked A1, and messed up after a few rides.

When I changed my battery, same story, drove a couple of blocks, and messed up again.

 

When I have my gauges finally working, and then shift to 2nd gear to compensate for the loss of power, my gauges die.

sometimes, i start at the light in 2nd gear, rev up a little high, then go to 3rd, and kick it makes make my gauges come back...sounds crazy, i know...i dont know if i should to see a mechanic or an exorcist!