I have a 90' accord, 2.2L, manual. When it's cold out and I start my car and drive off, before I let it warm up for a minute or two, and drive a short distance if I let it idle it revs up from 1500-2000rpm to 2500-3000rpm then drops. Revs up again and drop and it does this until it warms up then it smooths out and runs fine. WHAT'S CAUSING THIS??????

 

https://honda-tech.com/forums/honda-accord-1990-2002-2/1990-2002-accord-faq-1664547/

https://honda-tech.com/zerothread?id=1003988

https://honda-tech.com/zerothread/1844067

 

FITV and Air Boost Valve. Replace or get a block off plate for the air boost valve. Clean the FITV, tighten the white seal inside with a flathead, and replace seals. Then disconnect your battery for a few minutes, reconnect battery, start your car without touching the gas pedal, let car sit and idle until it warms up and the fans come on without touching the throttle at all. Turn off car and restart and everything should be fine.

 

Holmesnmanny and hooligan hit it right on the nose. My 97 accord was surging up and down and idling really high. So i removed the FITV and the IACV. Cleaned both, and adjusted the FITV and boom! Now it idles and runs like it should.


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Could even just be low coolant or air in the lines... add coolant an bleed it from your thermostat housing. Same thing was happening to my 91 f22. Good luck!

 

Good point. If there us no coolant flowing through the FITV then it won't properly control the idle like it should


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I had the same problem as you until I blocked off the fitv, the one located at the opposite end of the manifold. I used an aluminum piece from a soda can and wedged it between the manifold and fitv.

 

Same problem I had on my 96.. Check the coolant...

 

It rarely is ever the air boost valve. It rarely sees any action...only on startup so it doesn't really get worked at all...ergo doesn't have time to break down.

 

Thanks for everything guys. This is my first time on here so I'm a little slow figuring it out. I'll be sure to do what you've suggested and post again when I get it done. Thanks again.

 

I'm having this exact same problem, I have a coolant leak but even when I've just barely filled it up with coolant it will still idle eratically. does this mean that cleaning everything is a more feasable solution? or should I be planning on fixing the coolant leak before it will stop doing that? Every mechanic I ask seems to give me a different answer....

Thanks in advance for any advice!!