High cold idle, surging warm idle

Tiny
GFOURTH
  • MEMBER
  • 1993 TOYOTA PICKUP
Four cylinder two wheel drive manual 170,000 miles.

Hello, the truck has a 22r-e engine and recently I installed a new head, cam, timing cover, and water pump. The problem is that when the engine is cold it idles very very high, and when the truck warms up the idle will surge. When it is warm, it will surge up a little higher then it should for idle speed, then it will "cut out" and drop back down, and it does this over and over. Applying the brake lowers the idle, but it still surges. Ignition timing and valve timing are spot on. Where should I start? Thank you.
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Tuesday, May 6th, 2008 AT 12:06 PM

7 Replies

Tiny
JACK42
  • MEMBER
Clean out around the butterfly in the throttle bore with carburetor cleaner and a rag. This should help stabilize the idle. There is also an idle air screw on top of the throttle bore, try screwing it in half turn at a time to see what happens. Keep track of how many turns so you can put it back where it is if you need to. I have seen those screws vibrate out a little and change the idle.
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Wednesday, May 7th, 2008 AT 7:53 AM
Tiny
GFOURTH
  • MEMBER
Thank you for the response. I could not locate the idle air screw, but I did clean out the throttle body around the butterfly. One thing I noticed, there is a film of engine oil in the intake. It seems engine oil is being pulled into the intake through one of the hoses. Any thoughts on this?

The problem still stands. It seems to me like some kind of massive vacuum leak/problem to me, by the way it acts. Could this be an EGR problem?
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Monday, May 12th, 2008 AT 5:03 PM
Tiny
JACK42
  • MEMBER
Possible but not likely. The oil is normal for a Toyota. Try spraying around the intake area with carburetor cleaner to see if it reacts, that will be the vacuum leak. Look again for the idle air screw on top of the throttle bore (flat blade screwdriver).
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Monday, May 12th, 2008 AT 5:51 PM
Tiny
GFOURTH
  • MEMBER
Here is a picture of the intake. Is the idle air screw the flush slotted head on the left of the intake, just above the hose clamp screw? Thank you again for helping


http://www.2carpros.com/forum/automotive_pictures/187228_yota_intake_1.jpg

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Tuesday, May 13th, 2008 AT 4:34 PM
Tiny
JACK42
  • MEMBER
Yes. Turn it in half turn at a time, keeping track so you can put it back if necessary.
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Tuesday, May 13th, 2008 AT 5:03 PM
Tiny
ARIZMAN
  • MEMBER
When I buy Toyota for six hundred dollars, the reason why because engine went stop when engine getting warming. So I look at forum I found answer, it said turn adjust on flat screw to half turn on throttle. Finally engine still running without stopping it worked. Thanks, seem this truck is worth four thousand dollar because look great condition and next time in future when I got problem then I will come back to this forum.
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Monday, April 13th, 2009 AT 5:21 PM
Tiny
RACERBOY53
  • MEMBER
So after searching online for this problem this was my answer to my similar problem. Towards the rear of the engine compartment there is a gold colored valve that has some letters and vacuum hoses coming off it. There was one hose that was disconnected and I found that the idle adjusting screw was backed out completely (this screw is on the left side of the throttle body before the intake manifold). I screwed that back in and adjusted the idle accordingly. All fixed.
What was happening: I had an abnormal high idle when cold then as the temp come up to normal the idle would fluctuate up and down when the brake was depressed. This action of sporadic idling is caused from the ECM detecting this high idle condition and trying to compensate with the auto lower idle circuit that kicks in when you depress the brake. I hope this helps as it resolved my problem without replacing any parts. Thanks to all that have posted information for this problem it sure helped.
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Friday, September 24th, 2010 AT 5:50 PM

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