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Note: this is not a turbo.
When I got this car a few weeks ago, it had numerous vacuum leaks and other problems. The plugs indicated it was running towards lean. FTR, I did a plug, rotor, cap replacement.
Some background:
The AMM was replaced recently and installed by what I think is a very questionable mechanic. The adjustment screw was exposed, but maybe this is how they come when buying replacements. I would guess it has been adjusted. And if so, it was tuned to a car with major vacuum leaks, etc.
This weekend, I fixed up all the vacuum leaks. I installed new seals on the injectors, checked and replaced hoses. Replaced the intake hose (large flexible tube that goes from AMM to throttle body).
The car used to run steady, hesitate, shake and quiver, and so forth. Now it runs very steadily. BUT, the idle is up around 1200 rpms and cannot be brought down from there. In fact the adjustment does not do much at all.
I took the elctrical connections off of the throttle switch. Then started it up. This allowed adjustment of the idle, but only faster, not slower. I took the throttle switch off and pried it open. It was filled with motor oil (the result of a missing flame trap, which was spraying oil, aerosol style, into the intake). I cleaned it up with tuner bath and tested the switches inside (an icredibly simple device, this is). All was well. So I reinstalled it and made sure it did the click sound appropriately when the throttle was opened and closed. Still, I got nothing from the idle adjustment screw.
I pulled the adjustment screw out. I realized afterwards that this was risky since it could have broken the O ring, but I got it out and back in safely (used a small film of petroleum jelly to put back in). All was well with this.
I attempted to clean the throttle body. Although, I did this while attached which is challenging due to its position.
I attempted to back off the adjustment screw (the one where that controls where the butterfly valve might rest once the pedal is not applied) on the throttle body. It was backed off as far as I could get it.
So, I plan to clean the throttle body further. I will need the gasket before I can take it off. Taking it off seems to be the only way to be sure you have it properly cleaned.
Unfortunately, I do not have a CO meter so I cannot be sure about the AMM. Any advice on adjusting blind would be appreciated, even if the advice is to leave it alone.
Please give me any advice you might have to help resolve this problem. Does the AMM have an effect on the idle speed?
Thanks.
/Jarrod
P.S. I'm having fun with this regardless of the troubles. I have not done work of this magnitude in a while. I am reminded that I really enjoy this stuff. Maybe it's the fumes talking. Also, I have the Bentley 240 book coming and the "Bosch Fuel Injection and Engine Management" book. I can't wait.
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