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Hi,
I would advise not to follow the Bentley to the letters in every sentence of that procedure.
I wants you to adjust the throttle stop screw upwards a half turn or more as I remember.
You don’t want to do that as it takes away some of the range of closure of the IAC.
You want it to only touch up to the throttle stop lever and take on just a little pressure of that big spring around the pulley.
Do not turn it upwards anymore because it will start to open the throttle plate. It works out for me to be about the width of the screwdriver slot of a turn!
It’s called a “ stop screw.” It there to keep the big strong spring from banging the plate down inside the bore of the throttle body!
Then, reset the TPS switch to just click as you pick up tension on the pulley and linkage.
Or as ART says, “use a volt or ohmmeter to verify its working by back probing there at the connector.
I think there should be a ECU PIN 2 or 3 but don’t hold me to it. I might be out in left field on the correct pin but if you are at a total loss to what it is, a long shot is available! Art knows!
Another thing to check is the vacuum hose to the brake booster. The easiest way to do it is to have the engine running and squeezing it tightly and only firmly shut. You don’t want to cause harm to the integrity of the hose. Use something with a smooth large radius.
I would say put a couple fingers under there with the pliers but that might hurt! (o -:).
A piece of leather belt spreads the pressure and it won’t hurt your hide in the process.
There should be no change in idle speed when releasing.
If it slows down or idles more smoothly first, you have a bad check valve or booster.
Disclaimer : Unless the hose is leaking really close to the manifold clamp from a gaping split! These hoses are really aged into toughness but there is a lot of vacuum to resist collapsing.
The intake manifold is good too. It’s not very hard as you just lean the whole thing back with the black hose off.
There is plenty of room. I got to be careful when I say that, as with home visitors, there might be another opinion about it! (:-)
Phil
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