Mercedes-Benz Forum banner

1 - 1 of 1 Posts

·
Registered
1991 560sec. 1969 280SL
Joined
·
1,133 Posts
Discussion Starter #1

Registered

1991 560sec. 1969 280SL

H. D,
Would you please help me diagnose my rough idle please. It started after I replaced the motor mounts on my 91 560sec. I checked the tps operation by simple continuity tests with wot and closed throttle. Checked the integrity of the four pole engine temp sensor as per your instructions in a previous thread. I carry out a smoke test on the intake system and replaced the injector seals and holder cups.
You will remember from our previous conversation my O2 was not close enough to the exhaust manifold and decided to rectify that situation with some improvement. When I raise the idle to 850 to 900 rpm the engine smoothes out.
Upon cold start the engine seems more balanced and starts well, not so after reaching operating temperature and start up after an hour or so is requiring more cranking time. The injectors were replaced mid 2016 and the fuel pressure regulator was recently replaced. It seems I have two separate issues but may also be related.

Any thoughts,
 
1 - 1 of 1 Posts
Top