Why is my idle running high(about 1500 rpm) and sometimes it goes up and down ?

55

Asked by Apr 13, 2008 at 01:31 AM about the 1992 Honda Civic LX

Question type: Maintenance & Repair

Is it expensive to fix ? Also, sometimes I have to gun the gas to bring down the idle and than it goes up than down.  Thanks.

9 Answers

sounds like a bad throtle position senser or a vacume leek.

8 out of 8 people think this is helpful.
55

Thanks for the reply. How much do you think it would cost to repair either problem ?

3 out of 3 people think this is helpful.
40,305

Probably under $150 depending on labor rate and diagnosis time involved.

25

it may just be the automatic choke, does this happen on colder days?

2 out of 2 people think this is helpful.
35

wow, ok. well its your fast idle thermo valve. its full of carbon. just take off your intake tube and there is a hole on the bottom left. clean out that hole with carb cleaner and maybe some intake cleaner and keep your car running manually or it might die. then let it run for about 10 or 15 and you should be good. otherwise you need a new one

3 out of 3 people think this is helpful.
45

Idle air control motor are notorious for messing with the idle speed happened to a buddy. Easiest solution junkyard little time and 20 bucks. Cheapest way to try to resolve the problem if you need a new one. I call it an Idle air control motor the post above may be the same thing.

1 out of 1 people think this is helpful.
95

it's your O2 sensor

4 out of 4 people think this is helpful.
3,065

Make sure the coolant is full, Hondas can have surging idle speeds if the coolant is too low.

6 out of 6 people think this is helpful.
10

My 1999 civic lx is running at 1500 rpm while parked. Changed the idle control valve and it ran good for two days , I replaced a bad alternator and when I drove the car it ran steady at 1500 rpm . Any suggestions?

1 out of 1 people think this is helpful.

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