MyE28.com

Hello,

This 86' 535i 5sp manual drives fantastic at any speed, when cold and warm. However, coming to a stop the RPM (as seen in the video link) will jump momentarily to 1100 rpm and then settle to the (newly adjusted) 900 rpm idle position.

https://www.flickr.com/photos/109547372 ... ed-public/

Historically for the past nine years, this car had a very low rpm idle 500 to 650rpm. So finally did all the (Red _unt hair) and proper butterfly position settings per Kyle in NO.
Corrected the TPS position and unplugged the battery so the ECU would pick up the new signal. But nonetheless still keeps on surging when coming to a stop. If I reset the TPS back (as I did) to what it was the previous 500-650 rpm range then there's no surge I can detect.

I do want to keep the presently 900rpm idle speed. But want to get rid of this surge. Any suggestions please? Thank you in advance.

Link to video not working.

However, I've been having a similar issue. I've been able to alleviate it by adjusting the click wheel (clockwise) on the AFM. Maybe try going 1 or 2 clicks clockwise on the AFM and see if the problem gets better or worse.

Alternative, you could try to verify that the AFM is working properly by following demetk's guide.

My e28 is running M1.3 though, so your mileage may vary with a stock M1.0 car.

harrypalmer wrote: Nov 02, 2021 4:29 PM However, coming to a stop the RPM (as seen in the video link) will jump momentarily to 1100 rpm and then settle to the (newly adjusted) 900 rpm idle position.

Greetings Jack. My guess is that this is an indication that you have lost the idle signal because the TPS is misadjusted. Check that your TPS is clicking when you close the throttle. If you have a multi-meter pull the plug off the TPS and check resistance across pins 1 & 2. It should be close to 0 ohms indicating the two pins are connected.

You can't adjust the idle speed by moving the TPS. The idle can be adjusted a little bit by clocking the idle control valve a tiny bit but you need to make some adjustments to the valve. Most will frown on that and call it a hack.

I've been searching everywhere and can't find one anywhere so I have to ask. Where in the world did you manage to find this Red _unt hair?