Since two weeks...

I can't figure out what the hell is causing this... and this only happens at WOT, after 5500-5750 RPM.

This happens with my actual mod list, listed in my signature and also when I put back my whole GM Stage 2 kit (3.06" pulley, 42 lbs injectors and GM Stage 2 tune).

I'm using NGK BK7RE spark plugs. I tried gapping them at 0.30, 0.32, 0.34, 0.37, 0.40, nothing does it.

Also, with the GM Stage 2 kit, to avoid any knock, I have to use 93 octane gaz. With 91 (98% of our gaz stations here), I have some 3 degrees of knock from 4500 RPM and up. What the ****??? Seriously I dont have a clue... This would be my injectors ??? Why that? I have the problem with both the 60 and 42 lbs set of injectors.

Coil packs?? I dont know what value to judge but between two leads I have 9.8K ohms for all of them and between the two other leads I have for cylinder:

#1: 47.7K
#2: 48.5K
#3: 46.2K
#4: 46.6K

A compression test that I did today reveals that I have 195-195-195-195, equal pressure for all of them!

So... that is a good challenge for you, try to guess what problem I have...

Thanx for your help!

 

oil? lol...

 

Umm... I could be completely wrong but I would either say it could be your spark plugs (if you left the same plugs in for ottp stage and stage 2) or possibly your fuel filter.

 

Good idea for the fuel filter, but it has been changed lately, like 3 000 miles ago. I just got the P0351 code yesterday in the night when I did some WOT pulls. I did those pulls to test my new spark plug gap setting and that error code suddenly came in.

Humm... something around the coil pack #1...

 

I was sure that almost no people would have an idea...

What is the difference between a defective spark plugs and a defective coil pack?

 

basically the spark plug obviously throws the spark, and basically the coil pack is what gives the signal to the spark plug to throw the spark. if you have a faulty coil pack you would be bogging really bad and barely able to drive, it would feel like you are running on three cylinders because you are lol. it happened to me in my old car. so it could be the coil pack being faulty but if it was blown you wouldnt being bogging the whole time.

 

swap coil pack position and see if prob changes to cyl number 2....if it does, its a coil pack.... but i think its ur plugs.... those copper plougs dont last....

 

Its because the plugs I have are new... 4 days old! I can try swapping the coil pack but I had to do 8-9 bogus WOT pulls in order to see the P0351 code appearing...