its a 90 civic si. from a cold start it starts up no problem, but after its warmed up and you try starting it when the engine is still hot, it sputters for about 15-20 seconds (also sounds like its only running on 2 cylinders or something) but after you rev it a little it runs completely fine. except for about a minute later when you're givin it gas it'll sputter a little but then its completely fine until you turn it back off again. if anyone has any suggestions as to what this could be, let me know what you think.

 

Main relay, almost 100%. Ive had this issue, exact as you describe it, only when the engine is warmed.

Go to the scrap yard and pull one out of a car and youll know in 2 min

Good luck

 

God I disapear for like 3 months and all these freakin new people are posting about the same ****. Its a main relay problem what did we do in 99' with out ht and our cars did this ****? God they need us to whipe their *** to I guess.... Lol

 

main relay? i'll give it a whirl, thanks. you know 4thgen5thtime, there was a point in time when you didnt know that either so zip it, and dont come near my *** hole

 

Yes true. But theres a big F U CKING "SEARCH" button on the top... dumbass. Sputters always euqall main realy. Its been covered 1000009878 times. I'm not gay. But watch your ******* around your prison buddys.

 

i've tried two other main relays, neither of which made a difference. so apparently its not the main relay.. smartass

at idle the rpm's race (go up and then drop real quick over and over) so im thinking its something to do with the air and fuel ratio not being right
i also tried cleaning the IAC valve too on the back of the throttle body, any help would be greatly appreciated.. as long as you dont tell me to fix the main relay or use the search button

 

bad tps sensor...i changed mine two weeks ago and it runs fine...!!!

 

alright thanks dude ill give it a try