High idle

1788 Views 6 Replies 2 Participants Last post by Nissan_4.2.0., Apr 2, 2005

Nissan_4.2.0.

Discussion Starter · Mar 11, 2005

This has nothing to do with my previous post cause this has been going on for awhile. I just noticed it when I was driving tonight. The initial idle is about 2000, then drops to anywhere from 1100 to 1300 after 'warming' up. Is there a manual way to adjust this high idle? Its a 5spd manual trans if it matters

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Nostrodomas

· #2 · Mar 11, 2005

Have you done anything to your car at all? Touched the engine with your hands, anything?
So even after driving your car for a while the idle is still at 1,100 to 1,300?
You can manually adjust the idle, but you might want to find out why its doing this 1st before you go and put a band-aid over a cut that needs stitches.

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Nissan_4.2.0.

Discussion Starter · #3 · Mar 11, 2005

Idle

Well, I didnt touch it today before it did this. I was messing with it the other day but I was just cleaning the thing behind the air filter. Yeah, the idle has somehow been F*cked with and the lowest (unless I try and stall it out) it will go is 1100; Even after being driven for an hour straight. Weird! And yes, id rather avoid hitting the ER :thumbdwn: tonight

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Nostrodomas

· #4 · Mar 11, 2005

So you cleaned the throttlebody? I have head this is sometimes a symptom of cleaning the throttle body.
How about you clean the iac valve as well. Search the forum for How to clean the iac vavle. I have a write up with pic on how to do this. The reason I say to do this is because probably when you cleaned the TB, you pushed even more gunk into the valve, causing it to stick.
If that doesnt work, you can always manually adjust it for the time being until you actually fix the problem. On your throttlebody, there is a small black plastic/rubber plug on top of it. Remove the plug and you should see a screw. That is the idle adjustment screw. Turn the screw, I cant remember witch way to adjust your idle speed.

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Nissan_4.2.0.

Discussion Starter · #5 · Mar 13, 2005

Nostrodomas said:
So you cleaned the throttlebody? I have head this is sometimes a symptom of cleaning the throttle body.
How about you clean the iac valve as well. Search the forum for How to clean the iac vavle. I have a write up with pic on how to do this. The reason I say to do this is because probably when you cleaned the TB, you pushed even more gunk into the valve, causing it to stick.
If that doesnt work, you can always manually adjust it for the time being until you actually fix the problem. On your throttlebody, there is a small black plastic/rubber plug on top of it. Remove the plug and you should see a screw. That is the idle adjustment screw. Turn the screw, I cant remember witch way to adjust your idle speed.

I played with the screw a little bit; heres what happened. I advanced it (inward) and the engine kind of sputtered a little and didnt do much else. I backed it up as far as I could and it started hissing like a gigantic snake. All the while the idle moved nary an inch. Does this mean my idle is going to be stuck there forever?

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Nostrodomas

· #6 · Mar 13, 2005

Take off the intake hose. Look at the throttle body, turn the throttle, opening up the butterfly valve. Look inside, is it gunked up pretty bad? If so clean it. ALso clean out the IAC valve. There are instructions on how to clean bolth of thoes here on the forum, just use the search feature.
If that doesnt work, we'll go on from there.

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Nissan_4.2.0.

Discussion Starter · #7 · Apr 2, 2005

Nostrodomas said:
Take off the intake hose. Look at the throttle body, turn the throttle, opening up the butterfly valve. Look inside, is it gunked up pretty bad? If so clean it. ALso clean out the IAC valve. There are instructions on how to clean bolth of thoes here on the forum, just use the search feature.
If that doesnt work, we'll go on from there.

Thanks. I did all that, now everythings running all spiffy. Except, the idle is still high! All the hoses are hooked up, vacuum lines and everything. Noone else that has looked at it has figured it out yet. Is there anyway that the throttle cable going to the pedal could be stuck, pulling open the valve? Im running out of ideas quick!

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