Author Topic: '91 22re Idles surge w/A/C on and brake pedal depressed.  (Read 655 times)

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Snowtoy

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'91 22re Idles surge w/A/C on and brake pedal depressed.
« on: Jun 22, 2018, 12:44:54 AM »
Like the title says, the idle surges with the A/C on and brake pedal depressed.

Idle w/a/c off is about 800, turn A/C on and it jumps to about 1500, no issue until you depress the brakes, then the idle drops, rises moderately back to 1500, then drops.

I adjusted the A/C idle up screw, dropped the rpm's to 1200, same response, only slower for the rpm's to climb back to 1200, then drops to back to 8-900,.  I kept adjusting it a little at time, cycling the throttle, depressed the pedal,  until it stopped surging.  However, at the point it stops surging, when you turn the A/C off, and then back on, the rpm's drop, which was the issue I tried resolving last yr.

Now, the kicker is, if I use the throttle to raise rpm's to 1200 or 1500 with the A/C on, while the brake pedal is depressed, there is no surge like there is when the A/C idle up raises the rpm's.

I am I just not finding the sweet spot?
'90 black X-cab mod'd 3.0, 33's/4.88's, rear ARB, custom bumpers, sliders, safari rack, etc.
'91 Blue X-cab 22re, 35's/5.29's,Truetrac front, ARB rear, dual cases, and custom Safari flatbed, bumper, interior.
The money pit '87 Supra resto/mod

liveoak

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that issue is usually caused by the idle being set too high on a 22re on the set screw of the throttle body. here is a quote from 4crawler

"Hi Roger;

I have a 94 4wd p/u w/ 22re.  My engine runs great, except for when it is idling and I depress the brake pedal.  The engine then idles really weird, kind of a strong then weak then strong then weak, so on and so forth.  It never cuts out, though, and continues to idle normally when I take my foot off of the brake.  Iíve only noticed this after driving, like at a stoplight.  Thanks; Jason McDannold

Hi Jason;

Assuming there are no vacuum leaks, such as in the brake booster, itís likely because your idle speed is set too high.  I can exactly duplicate this ďproblemĒ in my Ď85 by bumping up the idle speed to a bit over 1000 RPM and itíll act as described.  Turn the idle speed back to normal, and it works fine.  Itís really not a problem, its supposed to work this way and if everything is set properly, and you wonít have the ďproblemĒ.

Why is this the case?  Because the ECU has logic built in that says if you hit the brakes and the engine is turning over 1000-1100 RPM, itíll cut the fuel to the injectors in an attempt to help you stop faster.  After all, no sense pumping gas into the engine when you are braking to a stop.  So idle rises, fuel is cut, idle falls, fuel restored, idle rises, etc.  Turn the idle back to 850-900 RPM where itís supposed to be and itíll get back to normal.  Idle speed is adjusted with the large slotted screw atop the throttle body.  Turn it in to lower the amount of air passing through the throttle body at idle (and thus lower the idle speed).
« Last Edit: Jun 22, 2018, 09:05:26 AM by liveoak »
my 3rz swap. http://board.marlincrawler.com/index.php?topic=97722.0

Let me start off with a basket of chips

Snowtoy [OP]

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Yah, thought that as well as I have it usually set about 1k, except when being smog checked. I will mess with it again this afternoon/evening.
'90 black X-cab mod'd 3.0, 33's/4.88's, rear ARB, custom bumpers, sliders, safari rack, etc.
'91 Blue X-cab 22re, 35's/5.29's,Truetrac front, ARB rear, dual cases, and custom Safari flatbed, bumper, interior.
The money pit '87 Supra resto/mod

Snowtoy [OP]

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Might have the problem located, yesterday I messed with it again, and this time I couldn't get the idle to change until I had the idle up screw all the way out, checked the VSV, and it would open, but the ohms are out of spec., will replace and see what it does.
'90 black X-cab mod'd 3.0, 33's/4.88's, rear ARB, custom bumpers, sliders, safari rack, etc.
'91 Blue X-cab 22re, 35's/5.29's,Truetrac front, ARB rear, dual cases, and custom Safari flatbed, bumper, interior.
The money pit '87 Supra resto/mod

 
 
 
 
 

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