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easy tbi idle adjustment

shooter

By shooter,
in 86.5-89 WD21 Pathfinders

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shooter NPORA Newbie

shooter

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Posted (edited)

This may be common knowledge but I just found the absolute idle control adjustment screw on my 89. After years of suffering with 1300/1400 idle speed now it is at 750. You can leave the air cleaner on. With a fairly long handled screwdriver just slide it just to the left of the 2nd spark plug boot-you can see the screw facing the passenger side. When you look on the front of the tbi you can see the screw just to the left of the 2nd plug boot on the front bottom of the tbi. Just back it off with the engine running and it will immediately drop the rpm down. I don't why I never tried this screw before. Flashlight, screwdriver and 2 minutes is all you need.

Edited by shooter
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MY1PATH NPORA Old-Timer

MY1PATH

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that screw actually controls how much air is allowed to bypass the throttle body when the FICD solenoids are activated. (bumping Idle for Alty load and A/C load.) if the ruber plungers on the sonleniods are rotted out air may always be bypassing thus causing your idle problem untill you turned it shut.

 

Find my TBI guide (pinned) for more info.

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shooter
NPORA Newbie

shooter

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yeah the guide is legit i used it the other day

 

All I know is the idle went from 1400 to 750 immediately. It speeds up to about 850 when the a/c is turned on. Looking at your tutorial I think My1Path has that screw marked as "idle adjustment screw, driver's right)

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