I don't think the '82 242 turbo wants to be sold. I think it's mad at me, because ever since I taped the for sale sign on its window it's requested a tune-up, and now it's possible that it wants a new "warm up regulator." Of course, it is a snotty child and informed me about the warm-up regulator by not starting for a potential buyer. Such is the way...

Anyway, from what I understand this part maintains fuel pressure while the car is cold, and it may need to just be adjusted. How does one adjust a "warm-up regulator?" Any other detailed information about this part that anyone would like to contribute would be greatly appreciated.

(The hopefully, still, potential buyer was able to drive the car after my mechanic got the car running long enough for it to warm up. But, not heard from since. In order to avoid such problems in the future, should I have a little talk with the car, saying that it will be going to a much better home, where it will actually be driven and have a lot of fun?)

Thanks, as always for your input.

Ragna
the "old" '82 242 Turbo
the "new" '89 245 DL

Here are the characteristics of the devices that control starting and warm-up on K-jet, in the Reader's Digest Condensed Version.
Initial starting (first running of the engine) is controlled by the start valve, and if it fails (thermo-time switch usually) then the engine doesn't start from dead cold, or only after prolonged cranking.
If the engine runs poorly AFTER starting, and has a weak, low speed idle, then the control pressure regulator is not enrichening the mixture sufficiently. Test for this by rapidly opening the throttle. If the engine spits back, or stalls, its lean.
If the engine runs slowly AFTER starting, but has a strong low speed idle, then the auxiliary air valve has failed. Test for this by rapidly opening the throttle. If the engine accelerates well, then them mixture is correct, but the total air flow is low.
Sometimes a poor idle during warm-up is due to worn injectors, as when the engine is cold, mixture formation is more important than when hot. Testing the pattern is easy, but not part of the condensed version.
Adjusting the control pressure regulator is possible, but not for the inexperienced.
Don't buy any parts unless the mechanic in question seems fully confident. Hanging parts isn't diagnosis, or a replacement for it.

The Warm Up Regulator or CPR (Control Pressure Regulator) helps a cold engine start & run smooth by making it easier for the fuel distributor to RICHEN the mixture. When the CPR fails it usually leads to very poor running when cold. The only part in the car that maintains the fuel pressure is the Accumulator but that is to help the car start on a warm/hot engine. I would check to see if your CPR is clogged thus giving you problems on cold starts or see if the cold start injector is even working/spraying fuel while the starter motor is turning. Too bad your not in my part of town cause I have been looking for a 242 Turbo to have fun with. Good Luck!

Sincerely,
--
Julio Meza

1979 264GL B27F 124K --> BW55->M46, CLS, IPD Sway, 81+ Dash, Gauges, Flat Hood

1979 262C B27F 160K --> Restore Project w/Possible B280F

1984 245DL 214K -->Wifemobile

Julio,
Thanks for the info. I think the CPR has been having a slow and valiant death. The car's had problems with hesitation when trying to accelerate when cold for about a year now. I didn't think much of it then (and I wish I was in your area too -- not too much interest in an "old" turbo out here) :-(

Ragna
the "old" '82 242 Turbo
the "new" '89 245 DL

Assuming it`s a K-Jet system Click Herefor how it works.

Colin.

1990 740SE B200E/M47, remote C/Locking.