High and erratic idle?

[Greybloke]

Last week my 91 3.0 man started to idle slightly higher than normal. Over the following days the idle increased slightly with every journey. It's now ticking over at a steady 2,500 rpm I've checked for obvious things, although I'm not too mechanicly minded. The problem changes if whilst stationry I blip the throttle, it will now "pulse" with revs rising and faling between a range of between 1,500 and 2,200rpm???

Anyway It's almost undrivable, especially in town, and it's booked into my Honda dealer on Monday ( It was booked in for a service anyway) so hopefully they will be able to isolate, and fix the problem. I was just wondering if you guys have experienced this one, and what you would guess is the fix?

Should I open a book on this one, any takers :wink:

Answers hopefully after Monday :biggrin:

 

[Briank]

Failed fast idle valve or a vacuum leak.

 

[Greybloke]

I have the diagnosis, any other guess's before I post the answer :smile:

 

[53heloFE]

It was the buttler in the library with the k'nifle valve......

 

[KODIAC]

um... something to do with cold start... colant low maybe... not getting to idles air control valve....

 

[da3dalus]

IAC valve... screw backed out maybe? thus raising idle?

 

[DDozier]

Do you have a Comptech Blower? Bypass hose failure.

 

[Greybloke]

yes yes very funny :smile:



Apparently the inlet manifold gasget has failed :frown: sounds simple, just a large bill from my Honda stealer

Still it's only money

 

[53heloFE]

Gotcja, what Braink said, vacuum leak...lol

 

[Greybloke]

Collected the car this evening, fully serviced (82,000 miles) all sorted :smile:

Car feels so responsive, all sort of crisp, agile and eager to go zooooooooooooooooooooom

Or it could be I was driving the squidgy courtesy car (Honda Jazz) for the last 2 days :redface:

Anyway apart from the invoice (£600) life is wonderful again, and I now know how to spell gasket