Re: Car bucking when hitting 4k WOT
 

If you have a Prelude/H22, those are stock spark plugs, but platinum.
go with ZFR7F-11 which are a heat range colder and only $2.44 each at ngk.com

Re: Car bucking when hitting 4k WOT
 

1/2 a tank.

Re: Car bucking when hitting 4k WOT
 

No could be a full tank.
But stuff like fuel pump not keeping up. Injector issues, cloged filter etc.
My reasoning is its only hapening at WOT. Fuel stravation and WOT tend to go hand in hand.

But hey be an optomist and hope its just the plugs. ;D

Re: Car bucking when hitting 4k WOT
 

try your cap and rotor had that problem

Re: Car bucking when hitting 4k WOT
 

Hey I'm the guy working on tuning this car. Its acting really strange. Its bucking even when the afr reads fine...like right around 11-12:1. Thats a good suggestion about the plugs though i didn't think about that. Whats really strange to me though is that one map i tried worked great on his car. It pulled hard fairly strong all the way to redline. We did a number of pulls with it. Then i went back and tried tuning it a little and again it was back to the bucking. Then i put the original map back in(the one that worked perfect) and it was bucking ???. From there on out i couldn't put a map in that wouldn't do this. I even tried somebody elses tuned h22 boost map on his car and it did the same thing. To me it seems like some kind of wiring problem...like maybe the map signal is reading funny or something. After all this we took a look at his wiring harness and it looked like there was some weird stuff going on under there where the afc had been wired. I'm not much of a wiring guy though so i wasn't going to screw around with it.

Re: Car bucking when hitting 4k WOT
 

Check the rotor in the dizzy?

Make sure the screw or allen screw isnt loose and none of the contacts or corroded or plastic chipped...

Re: Car bucking when hitting 4k WOT
 

Well I've got a brand new 255lph fuel pump in there and 450's that were working fine, but then when we tried using uberdata and scraping the afc, it started doing it.

And I checked out the dizzy about a month ago and it checked out fine. I can check it again for any loose bolts but I highly doubt it.

Re: Car bucking when hitting 4k WOT
 

yea i don't think its fuel starvation because it was bucking even when the afr's were fine.

Re: Car bucking when hitting 4k WOT
 

check your fuel filter?

Re: Car bucking when hitting 4k WOT
 

It's only two months old, and it's not fuel starvation. The afr's are fine.