Bouncing idle . . .already searched with no luck - Honda Prelude Forum

Si4WS · 03-15-2002, 12:24 AM

I have a 93 with i/h/e/pulleys and only after the car has fully warmed up I get a slight idle bounce. It will bounce from 800 to 700 or 600 rpm's erratically. I have replaced main fuel relay, fuel filter, distributor, plugs about 4 months ago and wires in summer of 2000. I tried to replace the rotor but the screw started to strip out so I let it go for now. What do you think my problem is? I have already done a search on the boards but everyone's problem is more dramatic then mine, so just looking for help.

Ludecrous777 · 03-15-2002, 09:37 AM

Have you replaced your coolant or radiator lately? There may be air in your coolant lines/tubes.

rudeskawn · 03-16-2002, 05:53 AM

I have the same problem....have yet to find the cure for it....

Ludecrous777 · 03-16-2002, 08:52 AM

you may have to purge the air out of the coolant...air in the coolant will cause an eratic idle.

This may be your problem but not sure.

rudeskawn · 03-17-2002, 08:29 PM

How would I go about doing that?

Lucke · 03-17-2002, 08:38 PM

mine just quit after i replaced the spark plugs, seems i was getting a partial spark from one of my plugs. after i hooked up a tube that was off my intake, reset my ECU and my plugs, i'm not getting a jumping idle

check your plugs, that might work, who know...

HondaPimp98 · 03-20-2002, 03:16 PM

hmm...i think a PCV valve causes a rough idle. im not exactl sure though. there is a way to check if it is bad.

~David

specialedition · 03-20-2002, 06:53 PM

does anyone know if the IAC could be the problem? where is located at?

Lucke · 03-20-2002, 07:06 PM

yes it could be the IAC, its a screw on the TB right above where the intake hooks up with the TB. also once you adjust the IAC its a good idea to reset your ecu, best way i found to do that is to unplug both terminals for like 30-60 min

hope that helps...

jgprelude · 03-20-2002, 11:20 PM

The IAC bolts to the front of the intake manifoldan (it is the only part with a wire connector pluged into it). You can not adjust it in any way. If you take it off the manifold you will see two little filter screens, clean them off and it might fix your problem(don't use a chemical cleaner, just a clean rag). I had a surging idle and wasted alot of money replacing expensive parts first, I ended up only needing $35 worth of new vacume lines.

Lucke · 03-21-2002, 12:58 AM

whoops i was thinking about the IAC valve

my bad