Hi there,
I am facing a lot (
) of troubles with my late 280 SL.
It was exported to the US in 1970, and it features some emission control stuff.
Problem: When cold all is fine. When hot it idles ROUGH and cuts out. Almost undriveable in town.
I found:
- the Head is stamped 280 SE
- the camshaft is a "05" one
- the pump is a R24Y one
- I have 2 rectangular relay blocks on the front left fender and a small "tin can" with 2 hoses + a wire going under / in it
- the dissi is a 062 one, so it has a transistor ign.
This means to me I have a late emission controlled US car. 160 HP, not the 170 HP Euro model.
Now, I looked and took care for:
- valve play: Adjusted. Since, it revs better
- connected the "tin can" to the pipe which formerly went directly into the distributor
- checked timing: looked fine to me
- checked and adjusted (new ball joints) the gas pedal actuator parts. Now the throttle opens when the pump "opens".
- I turned the "fob" on the pump leftmost. Maybe I can give it a few more turns but not many I believe.
- I checked the WRD: Closed the huge air correction screw, caused a loud hissing noise when cold. Pressing the intake pipe on the rear made the engine starve. When warm this was not the case- so it is not sucking air and this means the WRD is ok.
- adjusted the throttle to the point where it is JUST starting to bind.
Effects: Since I have done that, it is at least driveable when hot above 2500, 3000. Formerly, it went like a cangaroo from ~2300 upwards. Exception: Accelerating it ran nice, but driving along was impossible. This tells me it might be a problem with "not enough fuel OR a problem covered by a richer mixture".
But the main problem of a rough ride + a VERY rough ride at idle did not go away after having done the above.
What can I do next ? I think I will give it one more try and disconnect the pump from the throttle after driving it hot and check if it idles better with more fuel, or more air, then.
I then thought I should check ALL sensors (maybe one is giving wrong input, now, how do I do that- I don't even KNOW them all ?), and / or remove the ignition controller, and check that (no idea how, maybe I can open + resolder it or something like that) ?
I have at the moment not the slightest clue what fault I am hunting here. Wrong mixture ? Ignition troubles ?
Many thanks for any help- a structured way to follow to eliminate as much as possible would help me most....
Carsten
P.S:- Just found this maybe the wrong section- is there a method to moove this post to "where it belongs" ?