aguilasrafa10

I have a 1994 Honda Civic Ex and its giving me problems. I already took it to 4 mechanics and no one seems to know whats wrong. I was wondering if someone could help me find the problem. The car revs up and down when it gets warm on idle. It does it when you step on the accelarator. It bounces up and down for about 10 seconds and then goes back to normal. I've notice that this happens when the fan turns on. This problem makes it hard to drive because it stalls when it does this. Can anyone help me?


Modified by aguilasrafa10 at 7:31 PM 1/19/2006


Modified by aguilasrafa10 at 7:32 PM 1/19/2006

Cute EK

tps?

x93coupex

^^^ yeah i would start at the tps first then maybe the IAC

Hollywood...

I had a vacuum leak and that happened too. Check that.

AnDThEnWuT

fitv (fast idle therm valve) maybe?

slimisred

definately the TPS or a vacuum leak to the intake manifold

aguilasrafa10

i changed the tps already and it still does the same thing. once the engine gets warm it starts doing it. it does it for about 10 seconds and then it stops.

Cute EK

Changed the tps? How did you manage that?

aguilasrafa10

the tps is attached to the throttle body. had to change the whole throttle body but it continued to do the same thing. you have any idea of what it might be?

Cute EK

I thought you meant, actually changing just the tps. Hmm...try checking the pcv?

RTI

is your cel on?

aguilasrafa10

what do you mean?

Cute EK

cel=check engine light

aguilasrafa10

no. i dont know if its a sensor or a vacuum leak.


Modified by aguilasrafa10 at 9:01 PM 1/19/2006

Cute EK

It sounds like a vacuum leak, try listening for a hissing sound while the engine is running.

hondagriz

definitely a vacuum leak.. or you have a bad idle air control valve.

Sir_Wallace

Did you try adjusting your idle speed. Honda's have idle problems in cold weather when an after market intake is added. And if you had a vacume leak your RPM's would drop at 4k when you speed up.