1994 Honda Civic Idle problem and stalling

Tiny
VIXSTER09
  • MEMBER
  • 1994 HONDA CIVIC
Engine Mechanical problem
1994 Honda Civic Two Wheel Drive Manual 112000 miles

Hi, I have a 1994 (M reg) Honda Civic Lsi, with a 1493 engine. I am having some considerable problems with the idling on this car, I replaced the idle control valve with a second hand one, and it seemed to rectify the problem for a couple of weeks and now it is even worse! I have to keep the car above 2000 RPM for it to move anywhere without kangaroo hopping or stalling, initially this was just in 1-5th gear but it is now happening in reverse too. The car idles at 1000 RPM when stationary, and doesn't move from there, however when I press the accelerator to put the revs up to 1500 rpm and then let my foot off, when stationary, there is considerable die back and it drops to 0 and the car stalls, sometimes it manages to hang on and get the revs back up, but you can hear it struggling.

The car has recently been in the garage on the diagnostic machine and it is coming up with an idle control valve fault. The blokey there wants to check the wiring from the valve to the ECM, as he thinks this may be the problem, is the wiring likely to cause this problem, or would it be better just to get a new valve and fit it?

Also it was picked up that I need a new Cat converter for the car, again the blokey said this can cause the problems I am experiencing, are they easy to replace for a novice or should I just let the garage do it? And can the cat cause such problems with the idling?
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Sunday, March 22nd, 2009 AT 4:07 AM

3 Replies

Tiny
JACK42
  • MEMBER
The cat wont usually cause that kind of problem, it is usually a low power thing, but you never know, but it is a job for a shop. As far as the IAC fault, it isnt a bad idea to check the wiring and that the computer is giving proper reference voltage and that it is getting back to the comp, also good ground. Its kind of odd that the used one worked for a little while then did the same thing, that may be why he wants to check the wiring, hes doing a thorough job of repairing your vehicle
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Sunday, March 22nd, 2009 AT 8:59 AM
Tiny
VIXSTER09
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Hi Jack, thanks for your reply, car went in again yesterday for the wiring to be checked out, but when he put it on the diagnostics machine it was showing there was no fault at all! SO he decided to check out the cat, and its is totally blocked, he is currently in the process of blowing it out to try and get my car back on the road until I can afford to get a new cat fitted. I guess this was the main cause of the problem in the first place (after replacing the original faulty IAC). Also is the cat easy to replace for a novice or will it have to be done by him? (Trying to keep costs down!)
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Thursday, March 26th, 2009 AT 4:39 AM
Tiny
JACK42
  • MEMBER
Depends on where th ecat is. Some of them are mounted onto the bottom of the exhaust manifold, (shop job), the others are bolted inline in the exhaust system with just a clamp on one end (do-it-yourself job)
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Thursday, March 26th, 2009 AT 9:12 AM

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