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 rough idle with a/c
#737157
07/13/06 11:43 AM
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Joined: Sep 2005
Posts: 30
OP
Getting the Wheeling Fever
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My '88 22RE idles perfectly until I am running the a/c. Is there something that is supposed to compensate for the load? I know there is a fast idle adjustment, but I'm not sure if that is just for cold starts or if it will help with the load of the a/c. If I just slightly step on the gas pedal it smooths out.TIA, Roy
Hand me that crowbar.
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Re: rough idle with a/c
[Re: krauthead]
#737158
07/13/06 11:54 AM
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Joined: Jul 2003
Posts: 1,262
Body Damage is Cool
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Yes, there's a step up idle circuit with the a/c. Usually it's that white knob just to the right of the throttle plate when you're facing the engine.
'97 T-100 SR5
'86 Toyota's, the variety pack (all gone)
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Re: rough idle with a/c
[Re: foxtrapper]
#737159
07/13/06 01:27 PM
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Joined: Jan 2000
Posts: 12,153
Web Wheeler
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Next the the "E" in the photo below: ![[Linked Image]](http://www.4crawler.com/4x4/CheapTricks/22RE_Engine_Pix/p1020565.jpg) Make sure the vacuum ports are not clogged as well.
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Re: rough idle with a/c
[Re: 4Crawler]
#737160
07/13/06 01:35 PM
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Anonymous
Unregistered
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just curious, but how would one set it back to factory or default to try and get the idle better. kinda like someone messed with it, not knowing what it is, and now I think it could be the root of my evils. not that that someone was me or anything <img src="/forums/images/graemlins/ignore.gif" alt="" />
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Re: rough idle with a/c
#737161
07/13/06 01:43 PM
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Joined: Jan 2000
Posts: 12,153
Web Wheeler
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You set it so that the idle speed with the A/C on (if present) or with power steering working (if present) is somewhat higher (under load) than without the accesory on. Usually something around 1000 RPM works fine. If you set the speed too high (like 1200 or higher) you *will* get into the ECU's idle cutout RPM and the engine will cut out when you hit the brakes.
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Re: rough idle with a/c
[Re: 4Crawler]
#737162
07/13/06 01:48 PM
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Anonymous
Unregistered
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wow thats one of my problems.... who would of guessed <img src="/forums/images/graemlins/notooth.gif" alt="" />
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Re: rough idle with a/c
[Re: krauthead]
#737163
07/14/06 11:11 AM
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Joined: Sep 2005
Posts: 30
OP
Getting the Wheeling Fever
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Thanks for the replies guys. Especially for taking time to post a picture. I will play with it this morning and let you know. Sure sounds like just what I need. Roy
Hand me that crowbar.
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Re: rough idle with a/c
[Re: krauthead]
#737164
07/14/06 05:50 PM
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Joined: Sep 2005
Posts: 30
OP
Getting the Wheeling Fever
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Ok, I messed around with that adjustment screw and the idle is much smoother. It took the hiccup out of it but I can't say I really noticed the idle speed increasing. Don't argue with success! Thanks again.
Hand me that crowbar.
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Re: rough idle with a/c
[Re: krauthead]
#737165
07/14/06 08:41 PM
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Joined: Jan 2000
Posts: 12,153
Web Wheeler
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You might want to pull the vacuum lines and make sure they or the fittings are not plugged with crud. Mine fittings were totally clogged to the point I had to use a small drill bit to auger them out. And if that is working properly, you'll definately notice an idle speed change. And you will hear the pypass air hissing almost like a leaking tire, it can be petty loud.
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Re: rough idle with a/c
[Re: 4Crawler]
#737166
07/17/06 06:52 PM
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Joined: Oct 2000
Posts: 669
Rock Warrior
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Two parts to testing this:
1) Testing the VSV. With the AC off, try and blow through one of the tubes attached to the VSV. Should not flow air.
Turn the AC on, see if it flows air.
2) Bypass the VSV and route a single hose from the diaphram to a vac source - basically use the two connections on the diaphram with a single hose. Idle speed should change depending on the position of that plastic screw (out is faster).
In my case, VSV doesn't flow enough air to actuate the diaphram... I suspect the diaphram is old and crapped out, as I've cleaned both.
22REturbo.net 1988 4Runner 22RTE core, turbocharged, megasquirted...
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