Unusual idle after cleaning MAF and throttle body

[cccolin]

ok thanks guys. The throttle does not appear to be staying open, I checked that already.

 

[audiness]

I cleaned my maf with CRC maf cleaner, and it caused my maf to die. Took me almost 2 weeks to figure out what the problem was .

 

[cccolin]

well, I finally got time to take it all apart. the butterfly is returning to closed by itself. there's a small gap around it, but I believe there's supposed to be. the IAC valve appears to be operating normally, as much as I can tell. there's nothing stuck down in there, at least. the cables are somewhat slack, i.e. definitely not holding it open. The vacuum hoses seem to be fine. If I push the butterfly valve so that the very small, maybe a fat 1/32", gap closes, idle returns to normal. the throttle is not hitting the stop, so adjusting that wont help. I'm kind of at a loss here.

 

[cccolin]

just happened upon this video, after taking it all apart and putting it back together, tried pushing the butterfly to the side like this, and it dropped my idle immediately. not low enough, though, only to 1k.

https://www.youtube.com/watch?v=IIbTvxR1TQk

 

[gamefreakgc]

well, I finally got time to take it all apart. the butterfly is returning to closed by itself. there's a small gap around it, but I believe there's supposed to be. the IAC valve appears to be operating normally, as much as I can tell. there's nothing stuck down in there, at least. the cables are somewhat slack, i.e. definitely not holding it open. The vacuum hoses seem to be fine. If I push the butterfly valve so that the very small, maybe a fat 1/32", gap closes, idle returns to normal. the throttle is not hitting the stop, so adjusting that wont help. I'm kind of at a loss here.

Gap is bad. You might have a warped throttle body.

You can try pretty much anything, that washer trick might help. I suggest going a junkyard unit over new, some of the throttle bodies depending on year are crazy expensive.

 

[kolelt]

This is why I haven’t cleaned my MAF sensor. If it’s working fine, why clean it ? To many topics on how after people clean them. They have idle issue and such.

 

[AntleredRuin]

FWIW, I've had idle issue before after removing my air box and MAF, even if I did not clean anything.
The 'fix' was to loosen the cruise control cable (the one on the left), let the idle go back down, then re-tighten it with the engine running. So it ends up in the same place, but I had to 'trick' the computer, apparently. I guess the cruise part of the ECU was holding the RPMs higher.

Really wasn't even just idle issues, it was just a constant high rev, maybe 500 RPM higher at all points than it should be. Trying to let the ECU relearn did not help, either.

This has happened 2 or 3 times, and this fixed it without fail.

 

[cccolin]

FWIW, I've had idle issue before after removing my air box and MAF, even if I did not clean anything.
The 'fix' was to loosen the cruise control cable (the one on the left), let the idle go back down, then re-tighten it with the engine running. So it ends up in the same place, but I had to 'trick' the computer, apparently. I guess the cruise part of the ECU was holding the RPMs higher.

Really wasn't even just idle issues, it was just a constant high rev, maybe 500 RPM higher at all points than it should be. Trying to let the ECU relearn did not help, either.

This has happened 2 or 3 times, and this fixed it without fail.

well, it's definitely not the cruise control.

 

[cccolin]

so the issue is that the throttle is sticking open. I dont know why. i've taken the pulleys off and inspected it, they seem fine. I took the throttle body off and cleaned it by hand, nothing is block the butterfly, etc. I tried the thing in that video putting a washer on one side, didn't fix it. Every time I try to work on it, it gets worse. Now it's idling at 3000 rpm unless I close the throttle by hand. I don't have the bolt too tight, the springs went back where they were, I dont get it.

 

[cccolin]

replaced with a refurb MAF. doing the exact same thing. yay.

 

[baja1]

how about the heavier return spring approach?

 

[calnan]

Having the same issue. Any progress?

 

[mennisrodman]

If anyone references this thread, I had the same issue after cleaning the MAF and throttle body (attached).

I was careful not to spray too much in the throttle body, just wiped down as far as my fingers allowed to get any crud off.

First initial drive, would idle around 1100-1200. But after a few more drives, it purs very smoothly at about 700. It would idle around 800 before, with subtle bounces here and there.

So just as a few people have mentioned, the high idling should go away after ECU adjusts from a few drives.

 

[brillo_76]

If anyone references this thread, I had the same issue after cleaning the MAF and throttle body (attached).

I was careful not to spray too much in the throttle body, just wiped down as far as my fingers allowed to get any crud off.

First initial drive, would idle around 1100-1200. But after a few more drives, it purs very smoothly at about 700. It would idle around 800 before, with subtle bounces here and there.

So just as a few people have mentioned, the high idling should go away after ECU adjusts from a few drives.

That is exactly what happened when I cleaned mine. They sometimes will fast idle for a day or 3. Then seem to settle down. Great to point this out, as it may save some people extra work. As i experienced the exact same thing on a 1998 v6.

 

[orangemtbrider]

Yep, I second this!