"What you describe can be one of a number of things but lets just go through some basics:"

Onkel, what he describes is exactly how it is supposed to work.
--
Art Benstein near Baltimore

"...real expertise is never appreciated. People would always rather muddle along in their own dim, blundering way than have someone else point out where they were going wrong--even if that other person is clearly brighter." -Jeff Lindsay

Hi Emily Thewlis,

So, as in Odin's ravens Huginn and Muninn? Both of whom fly around the World and then return to inform Odin?

Odin and Freyja would probably drive a Volvo, if they could.

We'll get to see Thor shortly in the new Avengers film!

Please work through your diagnosis and repair as Onkel Udo II directs.

You made a prior post as to poor idling. Art Benstein and I both replied to help you through your idling issue.

Check socket six for fault codes in the ignition (spark, EGR) Bosch EZK engine controller? Sometimes, you can find a fault code in socket 2 (Bosch LH-Jetronic 2.4 [or possibly 3.1] fuel injection control) and socket six.

Look to the 700-900 FAQ, on this page:

https://www.brickboard.com/FAQ/700-900/EngineOBDCodes.htm


https://www.brickboard.com/FAQ/700-900/EngineFuelinjection.htm

See the section on Vacuum Leak Diagnosis. A section on the Fuel Pressure Regulator follows.

Many faults begin as intermittent. The On Board Diagnostic (OBD) helps you to diagnose to directs to the exact fault cause.

On the dash center console are three square buttons that control air flow. Do these work? If no, you have found a vacuum leak source.

There is a 20-amp fuse in a fuse holder in behind the battery below where the driver-side fender bolts to the car. The fuse connection may be corroded as Onkel Udo II describes. Sometimes, the fuse holder is too far deteriorated for reliable use, requiring a replacement, as what I had to do for my 1990 240 DL wagon (with manual transmission).

I'll also add that the accordion air intake hose that is between the AMM/MAF and the throttle body can make contact with the inner fender and other pieces. Over time, holes can form, that can cause the lean / rich fuel mixture at idle error code you have.

You may also want to check whether the:
- Fuel pressure regulator (FPR) is leaking through the connected vacuum line. If yes, replace it.
- How are the fuses in the fuse box? Remove the fuse box cover, and give each a gentle spin. Replace any blown fuses, and be sure they do not blow again!
- Air filter condition?

And, I can't think of much else right now.

Please try what Onkel Udo II diagnoses and correct.

Post back with your results.

Questions?

Thank you,

B.