I would think a boost leak would affect more than one cylinder. Durametric did not lead us to a bad fuel injector.

After tackling the easy items (plugs and coil packs) and not resolving the issue, we searched for other ideas. We performed a compression and leakdown test - which showed great numbers all around. We then thought it might be sticky lifter, but before going in that deep, we tried the injector and it resolved the misfire.

I'm not saying that is what you have - but it's something to consider.

 

I would go with checking the injector next...

 

Thanks for all the suggestions and responses...I think it's the injector also.

Probably will have a shop tackle this or you think this is project I can handle in my garage on jackstands?

 

Have you resolved your issue? What was the source of problem?

 

Ria, I've been lagging on this issue. I took the car to BBI today and it was very awkward.

The car misfired at idle on cylinder 4 with the MAF in, MAF unplugged it switched to cylinder 1 but not as serious or a great amount of misfire. After we decided to replace the maf (which I will do tomorrow) the car seem to have an awkward flash to it by GIAC being an EVOMS GT700 kit.

BBI told me it looked like it has a 100 OCT tune on it because is was pulling way to much timing, weird because when I got the car PPI and Dynoed by BBI it made 550 rwhp at 1.1 BAR with no problems.

So far it seems to be a flash issue, if that doesn't solve the problem we are going to head to the injectors and take them all out and send them off to get balanced and cleaned. So far it looks like to be a tune problem.

I will keep this thread posted, thanks for your concern Ria.

MT

 

i have been having some of the same symptoms. new coilpacks and spark plugs were put on when i got the car... but was manifesting the symptoms just about from the get go. it does have older 60# injectors tho... so what are the best ways to determine if the injectors are an issue with it or not?
thanx
old evoms gt700 setup with GIAC tuning

 

Ice, you have the exact same setup as me with the GIAC tune. Is you misfire at cylinder 4? or any one on the second bank? (passenger side cylinders).

I took the car to BBI autosport and they have been data logging for me, so far we sourced out the maf sensor with the durametric. I will keep you posted on this, it seems like it coming down to the tuning.