Funny Idle......., not so funny :( eh!

Thank you for your help with my cooling fault...... I bought it, I think I fixed it, I'll report the outcome when i get her on the road.........

I've been lovin on this beater (apologies to the true enthusiasts) for three afternoons now, and when I return to idle from a higher rpm I have an acute lull that quicky recovers.
TRANSLATION: I seem to idle about 800 RPM. When I release the accelerator, I drop to say 1050 RPM and then it falls to 650 recovers and settles back at 800. Kinda like its "hunting"

I hope I won a Chiltons on E-Bay yesterday but at this point I dont have any specs or knowledge other then what you fine people gift me with...

Is 800 Revs about normal for idle?

My ignorant guess (and I mean guess) is possibly a fuel pressure dampner?????? Is it an engine driven fuel pump (mechanical) or some electric magic tube/pump that the german$ are awfully proud of...... I dunno

>>>> Under my name up there on the left it says "Newbie"... Thats an under statement! <<<<

I have a good theoretic understanding of the combustion process, and am a pretty good parts changer....... When it comes to this German Engineering, I'll be a while catching up :)

Everyone, Have a Great Day!

Kurt

Is this what you're talking about?

http://www.frwilk.com/early944/misc//shudder.htm

yeah that sounds like what hes talking about to me too, (i had the same problem that was easily fixed by adjusting the 2 idle screws) but on the fr. wilk page, it says only early models had that problem, not later or euro models. i dunno.

Lights, Insurance, ACTION!

road test today...... A/c tomorrow (I want to experience that high volume air system).... I'm excited.

Will report my findings....... keep in mind that up to this point I have never driven something like this for more then three minutes (overheat)

hey are you taking it in to have the A/C done? Is it already converted to r143a? Does anyone know how much it costs?
thanks.

The fix works on the laters as well. I'm not sure about the euros though.

Thank You for the link, That does sound like the symptom and I understand the repair.

It seems like I might sacrafice fuel economy.... not that I can tell without the odometer working...

Ben, I have access to the equipment and I'll repair the A/C myself. It seems to have been R-134'd ---I hope that whoever did it knew what they were doing and did a good job. If its suspect I will end up replacing many dollars worth of parts or go without.

I do need to know which of the two sensors at the receiver dryer is the low pressure compressor cut off switch so I can jump it out and charge through the suction port.