My '86 560 sel hesitates when I accelerate from a stop. To me, it almost acts like a carburetted car that is out of time. The best way to describe it, is a "bogging out and sputtering" sensation, Once it's moving, it accelerates smoothly, but repeats the problem once it comes to a stop.

I have also noticed that the it sometimes takes a while to start, (many cranks), and I cannot help but think that I still do not have the power I once had.

I have 130K at the moment, and have replaced all the intake manifold gaskets, vaccuum hoses, fuel distributor and EHA valve (taken off a known good runner). I have also replaced the OVP, and fuel pump relay, along with the idle speed relay and temperature switch. The replacement of the OVP and fuel pump realay helped things quite a bit, as the car had little power, and a much poorer idle. Still, it's not completely right.

I have checked to make sure that the crank and distributor are aligned at TDC, and I have great spark as well. I am wondering if perhaps something like a crank sensor, or faulty throttle switch would create such problems.

This car ran great, with some intermittant idle issues (occasional shake), and had plenty of power. It seems it all went to hell from one day to the next, so I cannot help but think something electrical.

For grins, I will change the injector seals and nozzels, but I have not noticed a change in idle when spraying chemtool on the injectors.

Any suggestions, greatly appreciated.

Jack Klat has a 560 Mercedes
That has made him a big hit with the ladies
Now when he steps down
The engine doth frown
And that ends his ticket to Hades.

Sounds something like limp home mode. Have you pulled the codes or considered the oxy sensor?

__________________
Earl



1993 190E 2.3
2000 Toyota 4x4 Tundra

who adjusted the mixture after the fuel distributor replacement?

__________________
David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg

Hello, thanks for the replies. I went to move it this morning, and it started right up, ran roughly, but settled into an acceptible idle. When I took it around the block, the power was amazing, just like it was before anything started going wrong. I will check it once its fully warmed up and see what it does. As to the O2 sensor, I have yet to replacce it, and the fuel distributor mixture was adjusted months back by an indy who did my state inspection. I hope that great power doesnt go away once it fully warms up........

One more thing.. when driven cold this morning, there was no lag, or poor acceleration when mashing the accelerator. It also seems rev easier too..........