At first I was thinking it was bad gas so I burnt the tank out and refilled.... still there.

Then I thought maybe it was the old plugs I had in there, got new ones...... still there.

Checked timing and is zeroed.

The only thing I didn't do yet is watch fuel pressure at high rpm/load.

It has never missed before and I'm starting to pull my hair out. Anyone have a idea?? Also how do I tell if it's missing due to a fuel problem or a spark problem?

Thanks in advance

 

get us a datalog of the pertinent information?

 

I forgot to add it's a bit rich in those areas which to me says it's not a fuel delivery problem.

When I say rich I mean high 10's low 11's @7-11psi. Will that much fuel cause it to miss?

 

I wish I could but unfortunately I have a iMac and a shitty old laptop for the haltech.

I did do a datalog of the event and it all looks pretty good, no uneven rpm points, timing isn't all over the place ect..

 

there is no spikes in RPM? or injection pulse?
If not then I have run out of ideas.
Sorry.

 

looking at Datalog right now... Hmm.. I see a spot where it jumps from 5.040 to 6.020ms but it's at a spot where my boost was hunting a bit so it's hard to say. RPM is a steady climb.

The datalog for my WB shows a huge spike when it misses.

A pull from ~3500 to 7k it might miss 1 or two times.

 

I leaned it out a bit and now it's back to normal.

 

malpassi fuel pressure reg ? .......

 

nope, I have an aeromotive