my 91 crx (idle keeps surging up and down?) HELP!!!!!!

what up guys,
i have a 91 Crx HF..and just recently the idle go's up and down like crazy.It seems to only happen after i drive it for awhile...like after 5 minutes it will start surging when im ideling???

its driving me nuts......im about to take a sledge to it!!!!

this might unrelated but for some reason turning on the ac or fans makes it go away for a short period!!!!

someone help..before i pop the hood and start rippen $h1T up!!!!!



thanks
Budd

Check your hoses on the intake manifold by the trotle body.Have your car on if any hoses are disconnected put them back on.I had this same problem back when i had my HF engine.

sounds like possibly low on coolant. also check your radiator. it those are good, it could also possibly be a vaccuum leak. but check the coolant first.

Originally posted by LadyNRedSi
sounds like possibly low on coolant. also check your radiator. it those are good, it could also possibly be a vaccuum leak. but check the coolant first.

Yep i agree with ami. Thats what happened to me after my engine was warmed up.

sounds like a vacume leak

Hey Budd, you didn't just join that forum did you? ;)

hello everyone, just joined (probably my first post, anyways)

just to chime in, this was happening to me a while back exactly. it turned out to be a faulty voltage regulator. it was shot, so that it was no longer able to handle the over charging, so that turning on the a/c was a temporary solution. check the voltage over the battery when it is surging and see what it is.

hope that helps

Originally posted by 2ride4life
hello everyone, just joined (probably my first post, anyways)

just to chime in, this was happening to me a while back exactly. it turned out to be a faulty voltage regulator. it was shot, so that it was no longer able to handle the over charging, so that turning on the a/c was a temporary solution. check the voltage over the battery when it is surging and see what it is.

hope that helps
same thing happen to me .. thats what my problem was so you should check that as well

yo 2ride4life where r u at in canada??

unfortunately it can be a few things....first check vacum leaks and your TPS sensor a loose or broken sensor will cause the same thing. Then also check your coolant like they said. What happens is your IAT sensor or you coolant sensor will sense the air passing by it making it think the motor is cold so it kicks the idle up and down to warm the motor because it thinks it's cold.

So check those 3 first then I would go to the voltage and if that's still not it I would look for a leak in the throttle body or intake manifold because small leaks will do the same.

Good luck!

if you have a check engine light then it maybe your throttle position sensor. if not then more than likely a vacum leak.:cool: