GMP Upgrade Problems
11-23-2012, 03:30 PM
#1
Senior Member
Thread Starter
Join Date: 08-19-2007
Location: So.Cal.
Posts: 829
GMP Upgrade Problems
I went 6 months without an issue and loved the kit
. However, since January 2012 I have had nothing but problems and the dealer even with GM tech assist is stumped
. Multiple codes. Sensor codes, reading 25psi at Idle code(but it was at freeway speed at -10) when set. We have soldered the connections, replaced the turbo (per GM tech). replaced sensors, 5 psi of boost, no boost. random miss fires, goes into limp home mode, but will not always set the check engine light. Still no correction. The car has been with the dealer for weeks. Two weeks this last go around. Now they say they will replace the PCM. 
Does anyone have a clue or guidance or this? Is the engineer that designed this still on the board? I'm ex GM and this car was the western regions show vehicle. I'm looking for some help or I'll have to dump this car.
. However, since January 2012 I have had nothing but problems and the dealer even with GM tech assist is stumped. Multiple codes. Sensor codes, reading 25psi at Idle code(but it was at freeway speed at -10) when set. We have soldered the connections, replaced the turbo (per GM tech). replaced sensors, 5 psi of boost, no boost. random miss fires, goes into limp home mode, but will not always set the check engine light. Still no correction. The car has been with the dealer for weeks. Two weeks this last go around. Now they say they will replace the PCM. Does anyone have a clue or guidance or this? Is the engineer that designed this still on the board? I'm ex GM and this car was the western regions show vehicle. I'm looking for some help or I'll have to dump this car.
11-24-2012, 12:18 AM
#5
Senior Member
Thread Starter
Join Date: 08-19-2007
Location: So.Cal.
Posts: 829
Wish I had the codes to give you. I have not gotten them from the dealer. Yes, I do mean ECM. GMP=GM Performance, I have the GM Performance Parts Turbo Upgrade Kit on the car.
When I spoke to the dealer last week, he stated the latest code indicated there was high boost at idle, but the tech was driving at 65mph on the freeway.
Symptoms: random miss fire, low boost in all gears (max 5psi), low power as if timing is retarded. stalling on initial acceleration from a stop.
Previously they have changed the MAP sensor provided in the kit, soldered the connections, replaced a Turbo charger as the code indicated the waste gate was not functioning. The other issue is that when these things start happening, the check engine light does not always come on. They were going to change the ECM today if it came in. I'll find out more possibly Monday.
When I spoke to the dealer last week, he stated the latest code indicated there was high boost at idle, but the tech was driving at 65mph on the freeway.
Symptoms: random miss fire, low boost in all gears (max 5psi), low power as if timing is retarded. stalling on initial acceleration from a stop.
Previously they have changed the MAP sensor provided in the kit, soldered the connections, replaced a Turbo charger as the code indicated the waste gate was not functioning. The other issue is that when these things start happening, the check engine light does not always come on. They were going to change the ECM today if it came in. I'll find out more possibly Monday.
11-25-2012, 01:42 PM
#10
Senior Member
Join Date: 11-07-2012
Location: West Virginia
Posts: 104
My fix was to trade the truck in on a Pontiac GTO. LOL