problem with spuddering
 

It seems that when I get to around 5k rpm and above, no matter the load, it starts to sputter. I lessened the gap on the spark plugs to no avail... I am going to log a run right now. Any ideas? AFR seems fine when it does it..

A short in the CAS lines? We had a car with that problem - when it happened, it was very RPM Specific.
Stephanie

are you running cops? i would look at that or wires... my FI thunderbird had what seemed like spark blowout at just high load, changed and gapped plugs at .40, no dice... changed everyhting BUT the wires... once i did.. well, i just kicked myself.

I had the same thing happen to me, changing the plugs fixed it.

cracks in the ceramic insulator could be an issue also.

alright ill get new spark plugs, and I just ordered better plugs for the toyota COPS so I can eliminate my wiring as a issue.

Any way to check the CAS output? There seems to be no odd things on the datalogging. I need this fixed before sat for the dyno day haha.

Put new plugs in, and same thing. What should I start lookin at next? It seems to do it at above 4000 rpm and 3 to 5 psi boost.

This kind of spuddering?

http://www.global-b2b-network.com/di...563/Potato.jpg

Make some french fries.



Can we get a good datalog on it?

do you have any settings that might trigger then? never happened before?

Never happened before. no settings eaither, launch control, rev limit, boost cut is all ok.

Ok here are two logs. I think I need to re calberate my LC-1, because its reading almost a full point higher than normal :crx:.The first log is my regular map for like a year, The seconded log is with 17 fuel points added above 100 kpa! :crx::crx:.

Every time I was at full throttle, it was studdering. You should be able to tell by the bumpyness of the rpm graph.

Im not sure what to do guys. Vacuum at idle is perfectly normal, and driveing out of boost is fine. Maybe its a loose wire??

HERE IS THE FIRST LOG Free File Hosting Made Simple - MediaFire

well it was a freaking loose contact on the coil plug. What the fuck lol. Well dyno day here I come!!

i was about to tell you to swap out the coil with someone to check it out. i just went thru an ordeal that turned out to be a coilpack "going" bad!
mine would run fine until i got into boost. couldn't figure it out, especially since it started happening immediatly after another completely unrelated fuel issue. finally the car started running bad at idle and i found it in seconds, AFTER i ordered a 150 dollar serial adapter to datalog with my link ecu. :vash: glad you found it quick.

Glad you figured it out cdx!

Oh the things you could have beaten yourself up chasing down...