I recently have been having some problems with my car. My car will sometimes start up normal and then when I start driving with go in eng pwr reduced mode. It will have a sound like it is sputtering and has backfire sounds. While at idle my boost will creep up to 0 but if I step on the gas it will go back towards -20. Could this be a spark problem? My car has always had a idle problem. Ever since I got my 60 lb injectors and the zzp tune. PLease help me!!

 

Codes?

 

Not sure, Im from maryland and I could go to the local auto store and borrow a code reader, here in cali I went to a store and they said I had to spend 70 dollars on one. Im gonna find a place then I'll post the additional info

 

zzp tune ? did u get a case relearn afterwards or did they program your origional pcm ? Also , your car will never run right until you get away from that zzp tune but after I installed thiers I got that engine reduced crap sometimes but now that I have my own pcm in I am ok

 

i've had the same problem, car in in the shop and they said it has something to do with the throttle body positioning sensor, i've been trying to get in contact with the guys from zzp but it seems like they are just ignoring the problem. I would suggest trying to contact them also, since thus far your the only other one i've seen have this problem besides me. Once i get in touch with zzp and the shop my car is at i'll see if i can help you at all, but for now i suggest just letting the ss sit for a while so nothing worse happens.

sub'd for info and help,

 

Wish I could just let it sit but its my only car. the only way to get rid of it was to pull the pcm wire and then reset it but that isnt working. I need someone with hp tuners to retune!! I will pay!!

 

Well i had my car tuned with trifecta on my stock ecu and it still happened, idn why but after it all started with the zzp tune it messed up my car. hopefully this does not happen to you. The shop that my car is at says its the zzp ecu that did all this but who knows. I've sent ZZP an e-mail just a few mins ago with links to multiple threads about this problem, if they respond this time i'll post it so it could possible help you out.

 

Doesn't sounds like a spark problem. I would start by finding an autozone or somewhere that can read the codes and post those. If there is a TB issue you should have a code for it. If there are no codes then you can check the stuff below.

It sounds like you have an air leak somewhere. Pull the injectors out and check the seals. Re-lube them and re-install. Then I would check the intake/SC/manifold for leaks. Next would be to have a compression test done. If the compression test is good then I would pull the SC and intake manifold off and replace the gaskets on them. If it isn't fixed after all that then you are going to have to take it to a shop to have them try and track down the problem.

 

Sounds like I have a lot of work to do tomorrow!!!


Edit: so after having to buy a code reader, I hook it up and these are the codes that I am throwing:
P2135,P2101,P2228!!!

Any help with how to fix these??

 

So I emailed zzp and they responded right back to me and have offered to send me a new reprogrammed PCM. I am sending it overnight today and they will send one out tomorrow hopefully also overnighted. I have been thinking about getting a trifecta tune but will cost 285 plus a 200 dollar refundable deposit. For now the zzp will have to do. Just email them and they will take care of it for you!! If anyone in the Huntington beach California area has hp tuners and unlocked 2007 let me know. It would be great to have a modified tune to help with the fuel trims because it is misfiring at idle with the 60lb injectors

 

P2101 Control Module Throttle Actuator Position Performance ECM, PCM

P2135 Throttle Position (TP) Sensor 1-2 Correlation ECM, PCM

P2228 Barometric Pressure (BARO) Sensor Circuit Low Voltage PCM

The first two are TP sensor codes. The last code is a BARO sensor low voltage code which might be caused by incorrect air flow because of the TP not working correctly. It sounds like the TP is getting bad signals either from the TP sensor on the TB or the TAP at the actual accelerator pedal. If the new ECU doesn't fix the problem i would start looking at those two sensors.

 

I believe those were the codes I had when my TB was bad. Not 100% sure though.

 

If the new pcm doesn't do it then I will check the sensor out. Those codes are the same ones that the GM bulletin said that was faulty in the pcms. I will keep you guys informed. I should get the new one either tomorrow or possibly mon or tuesday. Thanks for all the advise. I really need to get my car back up and running.

 

had the same codes.. gm replaced the TB and MAF. went away. just dont get into boost and you can drive... lol

 

lol that's very hard to do especially since when pulling out of a parking spot it goes right into eng pwr reduced mode. I have my pcm coming tomorrow so hopefully that will take car of it. When GM replaced them did they notice the aftermarket parts and still warranty it?

 

sounds like a lot of useless work and money spent considereing the problem started after he insalled a zzp pcm

 

1. I could do all of the things listed in 2 hours time.
2. It doesn't state the problem started *right* after the 60s and PCM were installed. In fact, he implied that it has been running for a while with a rough idle (normal with 60# injectors) and limp mode just started happening recently. It doesn't rule out a bad PCM, but it doesn't necessarily imply the PCM is bad either.

If he gets the new PCM and all is fixed, then problem solved. If not, he is going to have to start checking things somewhere.

 

I agree!! GM has a bulletin saying that these codes are being thrown and sending the car in limp mode and is due to a faulty pcm. I am going to be highly irritated if the pcm doesn't fix it, fortunately tim at zzp was awesome and helped me through the whole thing. if it is a tb sensor or another sensor then that is a easy fix also. I've had the 60's and the tuned pcm for about a year or so running pretty good except for the rough idle problem where at times my car would stall. Tim thinks that the modified pcm might fix this problem as the aftermarket intake programming might have something to do with this. I will keep you all updated. I am installing it tonight when I get off work.

 

So it wasn't the PCM!!! I am so mad! I am going to have to take it to the GM shop and see if they will cover the sensors under warranty. Anyone had the same codes and had aftermarket parts get it warrantied?? Please let me know.