Thread: MAF & idle woes

G'day David, yes you can adjust the MAF voltage just do a search on this here but it might be worth checking the stepper motor as it plays a bigger role in the idle speed. It would also be worth getting your distributor checked as well.

Backfiring doesn't seem all that fatal to MAF's on these, apart from knocking out the mesh. Dirt and oil is by far a greater risk, often due to a broken air cleaner or incorrect breather hose position.

I would unscrew the idle air control (IAC) valve (AKA stepper) from the back of the manifold, soak it in carby cleaner. Don't force the spindle, it has delicate parts. I've seen these jam after a backfire.

Also look for loose hose joints on the various idle circuits.

There is a manual idle adjuster screw on top of the manifold near the throttle butterfly, screw it in a bit with a 3/16 allen key.

Agree with B on this - most probably ill fitting/blown off hoses or jammed IAC. But also check that the throttle plate hasn't been damaged by the explosive forces of the backfiring - small twist, jamming in its return to the base idle position, throttle cable dislodged from its return stop.

If the IAC is damaged, the replacement IAC controller is Standard ISC-030. Fits Camira, Land Rover, about $65-70.

HTH

Pete

Thanks to everyone who replied - plenty to look at over the weekend.

Will post my findings when I get to the bottom of it all.

Cheers - David