Idle bouncing from 1,000RPM to 2,000RPM

INFORMATION Integra Help
1

My friend’s 90 Integra LS is having idle problems…Its bouncing up and down from 1grand to 2grand and when you turn the AC on it drops to 1,000 RPM

He thinks its the Map Sensor and unplugged it to see if the problem changed…I told him that unplugging it will not show him anything but a check engine light and high idle…The fast idle screw is adjusted to the minimum and the problem persists…

Any help will be appreciated…The car doesn’t want to stall at all, so I don’t think its a vaccuum leak, plus we can’t hear a damn thing leaking and we checked the visible vaccuum hoses and they are secure…

Thanks in advance,
Zee
intikab@cs.com

2

check to make sure he has enough coolant. surprisingly enough low coolant can cause your idle to bounce.

having the ecu improperly reset can also cause it to bounce a little, however it usually goes away after a few days.

another thing to check is the iacv (idle air control valve --i think thats what its called). I personally haven’t had any experience with it though.

lastly the throttle position sensor. However usually if the tps is bad your ecu will throw a code and tell you its bad.

3

Check your FAST Idle Vavle. Located under the Throttle body. It allows extra air to bypass manifold. If it gets stuck your car will idle up and down all the time. easy fix.

4

i had my idle bouncing from 1000-2000 and it was caused by the brake booster going up and i had to have the booster and master cylinder replaced then the problem stopped. im not sure if this is the same thing but just offering some suggestions.:slight_smile:

5

Have you checked to see if the ECU is throwing codes?

Check the Idle Air Control valve to see if that’s the problem. I had a buddy’s CRX act the same way and it was basically undriveable.

6

:search: