when i start driving with a cold engine (warmed up for about a minute usually), it will start jerking, and if i try to hold my rpms at 2500-3k rpms it will stay there for a couple seconds and violently drop and resume. but when the engine is warmed up it doesn't do this? im thinking 02 sensor maybe...

also sometimes when i push my fully warmed up engine to redline it will violently cough at like 6k rpms... dont know if this is a related issue or not...

95 del sol, jdm d15b - i/h/e, chip

thanks in advance, i searched but my scenario seemed a little unique.

 

im going to clean my iacv to eliminate that as a possibility.

fyi recently changed oil, problem started a little after that. nothing out of the ordinary. i added a little too much oil on accident though.

 

Sounds like a fitv (fast idle thermo valve), it probably sticking. Thats usually where the bukcing comes from. Im partially dealing with this problem myself at the moment.

 

i was afraid it would be that haha, its not that it's hard to take apart, its just that its a pain in the *** to get at with my intake in the way, but ill give that a try tomorrow

thanks again bud

 

Too much oil can cause ya to spin bearings so hopefully you corrected that.

you used 5-30 right?

 

yes 5w-30 royal purple, its about 4mm over the top hole, i didn't really think anything of it. for some reason i thought its supposed to get about 4.2 quarts.... or maybe its 3.2... **** haha

 

cleaned FITV/IACV problem persists. it does it with a cold engine but seems to get a little better when its at operating temp. and it doesn't bog when at WOT... what could it be? vacuum leak? fuel pressure? dizzy?