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Home > Home & Garden > Cars & Trucks   »   1990 Honda Accord Fluctuating RPM in idle

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Old Jan 28, 2008, 08:04 PM
jtenny
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1990 Honda Accord Fluctuating RPM in idle

I have a 1990 Honda Accord that is fluctuating between 900 and 1400 rpms while idling and after the car has warmed up. What is going on?

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Old Oct 12, 2008, 12:40 PM   #11  
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So awhile back, I had some problems with my daughters car over heating. I take it to National Auto to have a radiator replaced, as well as a head gasket. I get the car back in about a week with additional problems. They broke a hose at the vacumn advance module, replaced costing 60 bucks. They failed to hook up a hose to the egr valve. Fixed. Then about a week or so, my daughter complains that there is something else wrong with the car. I take it out for a spin, and the engine light is on, and the rpms jump up and down, and I was beside myself. After looking at all vacumn hoses, I gave up. I jumped on line to see if I could trouble shoot it here. Found this forum about IACV and said that seems like the problem, so I pull it off. Guess what? Where it bolts onto the intake plenum, they had cut a small thin piece of metal and plugged it. I pulled the metal plate off, cleaned up the IACV, and her car purrs like a kitten. I am sooooooo mad at national auto!!!!!! I will never take any vehicle back there ever again.
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Old Oct 25, 2008, 08:26 PM   #12  
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i have 89 accord that had sperratic rpm. there is a bleed off for the coolant.if the cooling system has air in it it will cause the motor to run rough(rpm high and low).crack open the bleeder while the motor is running,let the air purge out ,tighten the bleeder and adjust the idle.
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Old Oct 27, 2008, 11:26 AM   #13  
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i have a 1990 civic hatchback si and when it starts it idels rough then the check engine light come on and it idles smooth but when you go to giv it gas it cuts out half throttle and wont go any more it also tops out at 55 in 5th gear and when you go to down shift to get more acceleration it cuts the fuel out till it slow down to the speed it wants to opperate at what could be wrong?
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Old Oct 27, 2008, 05:01 PM   #14  
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maybe you have a bad 02 sensor or fuel filter(filters) are clogged.
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Old Oct 29, 2008, 08:55 PM   #15  
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no i put in new ones
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Old Oct 30, 2008, 07:04 PM   #16  
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catylilic converter
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Old Oct 13, 2009, 01:55 PM   #17  
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I am currently working on a similar problem with a 1990 honda accord.When starting cold it goes up to about 2000 R.P.M.S and then it starts surging between 850 to 2000 until it warms up.I plugged off the brake booster checking for vacuum leaks and it stopped surging.I replaced the booster and now it surges only a third of the time.Apparently this has helped.The cold idle is still too high,around 2000.It should be about 1600.I checked the air starting valve and found that the diaphragm on the
valve is leaking.The manual says to replace if leaking.I will be installing a new air starting valve soon.Maybe this will fix the
problem.Ill post the results soon.
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