Ecu problem? - Honda Prelude Forum

Koizuki · 12-05-2008, 04:07 AM

i have a 94 prelude si, this car was an auto swap to manual when i bought it but i have some problems with it. i was thinking that it might be the ecu but not sure. so heres the problem.. the car would some time rev and not pick up speed when i step on the gas and the clutch acts weird this only happens when i leave the car idle for a while other than that it drives fine. another problem is that if i drive over 70mph or rev it too high the check engine light would go on. is it the ecu? i am not sure if the previous owner switch the ecu to manual when he swaped the car to manual. plz help me out

Koizuki · 12-05-2008, 04:13 AM

oh another problem is the car sometimes revs at idle and sometimes it will drop from 1000rpm to around 600rpm , the car would start shaking like its about to stall but after stepping on the gas would fix it at times. sry for the double post

petern101 · 12-05-2008, 12:36 PM

This is probably 99% not an ecu problem. You do have a manual p14 right?

Koizuki · 12-05-2008, 02:10 PM

well i am not sure if its a manual p14 or auto since i bought the car its already swapped frum auto to manual. will the car even run if i am using an auto ecu? some people telling me its the clutch but i am not sure

petern101 · 12-05-2008, 03:58 PM

^yes actually it will, you will probably get codes though because the ecu doesn't detect an auto

A clutch wouldn't affect the rev's at idle.

Koizuki · 12-07-2008, 09:09 PM

anybody know wat might the problem be?

Koizuki · 12-12-2008, 02:44 PM

sumone helpp >.>

Koizuki · 12-14-2008, 07:12 PM

just a thought , could the revving problem be caused by the clutch and slave matser cylinder? becuz when i leave the car idle for a while the clutch starts to pump up higher and higher to the point i just need to tap it to switch gears. but when i drive it in 5th gear it will sometimes fix the problem.