Adjust throttle plate - what am I doing wrong?

[jimrat]

Hi

I've adjusted my throttle plate as described in the Bentley manual: 0.4mm clearance between plate and wall at idle position.

However, to get the TPS adjusted correctly, I had elongate the holes in the sensor mount so that I could rotate the TPS enough for it to see the idle position. ???

Once adjusted, I checked it with a multimeter, and the TPS adjustment was fine. But now I've fitted it, the car idles way too high, like 1500rpm.

What have I done wrong? I used a 0.4mm feeler gauge (15 thou). Is this too much?

The reason I was messing with it is my car won't idle. I've spent hours checking EVERYTHING, and the throttle was the only thing that wasn’t as per the Bentley manual

Cheers
Jim

[redcar]

[Billwill]

What E30 do you have?

I am not a great fan of Bentley to be honest.

There is a Wiki here that describes replacing a E320 Throttle Body with one from a E325.....final step states that there must be no gap at all of the butterfly when closed but it must not stick!

[e301988325i]

What have I done wrong? I used a 0.4mm feeler gauge (15 thou). Is this too much?Cheers
Jim

Way too much, try using the corner of a bit of normal white A4 paper which should achieve a gap of 0.1mm.

Then adjust the TPS to suit.

The fact you had to modify the TPS should have been a give away that something was clearly not correct.

[Brianmoooore]

Adjusting the throttle stop requires the use of a BMW special tool - basically a dummy idle control valve with a fixed opening - NOT a feeler gauge.
In the absence of the tool, I blank off both ICV connections (or fit a blocked up ICV) and adjust the stop to give a very low and rough idle that threatens to tear the engine off of its mounts.
Once this is set, the throttle position switch will need adjusting, or checking at least.
Best advice is not to touch the setting in the first place. It does not need adjusting.

[fixedwheelnut]

For throttle stops I have always used a piece of paper between the stop screw and housing gently pull the paper as you screw in the stop screw until it grabs the paper.
Then screw it in 1/2 a turn and lock it up.

Thats always worked well for me