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RPMs fluctuate when idling


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Posted

Hey everyone,

 

Today I just bought a 1994 Honda Accord fo $900. The thing is in excellent condition, with 137,952 miles on it. Brakes, engine, steering, etc work fine.

 

At a stop light, however, I put the car in park so I could reach in the backseat to grab something. I noticed that the RPMs starting jumping up and down from 900 to 2,200 RPMs. As soon as I put the car in drive, it stopped. I put it in neutral, it started. I put it in drive, it stopped.

 

I spoke to a "mechanic" at Wal*Mart when I was there grabbing floormats, and he said it sounded like the Mass Air Flow Sensor was out of wack. Does this sound accurate, and how much am I looking at to get it repaired?

 

Thank you,

Jordan Meeter

Posted

doesnt have a mass air flow sensor , lol. could be your iacv , or try topping up your coolant perhaps its low.

Posted

Mine does something similar when I'm cruising at about 70-80. but it only bounces about 200-300 rpm. At first I thought it was because my car was trying to pull but even on downhills it does it.

Posted
idle air control valve....on the back of the intake manifold

think that could be my problem too?

Posted

ha i've never heard of fluctuating rpm's during highway driving.....couldn't help ya

Posted

sounds like surging , it could be iacv. could be a couple things.

Posted

My crx does the same thing even after i replaced the iacv and did a radiator flush. Its really annoying.

Posted

how's your distributor?

 

back in the day when mine was AT the rotor kept getting water on it and corroding, which then caused the rpm's to fluctuate all the time, then it would die about 2 weeks later.

Posted
how's your distributor?

 

If you are asking me mine is fine only replaced the cap and rotor when tuning up.

Posted

If it is the IAC valve then yes you have to relpace it. I wouldn't take a chance on trying to clean it. I saw one guy clean one at work w/ throttle body leaned and it ended up ruining the IAC valve and the MAP sensnsor.

Posted

yes, buy the IACV before the O2, so you can replace it and see if it fixes your problem,

 

if not, buy an o2.

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