Author Topic: Running very rich  (Read 3242 times)

Naj ✝︎

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Running very rich
« on: March 01, 2009, 22:58:49 »
This weekend, we had a tinker with a US spec 250 SL.
It runs very very rich.
A Blacklick test with no fuel and just opening the throttle valve revs up the engine with no load to 3000 rpm.
My bet was that it had a stuck open CSV.
I lost. Not even one drop a minute leakage!

Oil level in the FIP was all the way up the dipstick.
The oil was black and thick, no sign od fuel dilution. This was sucked out with a syringe and replenished with new oil upto the correct level.

No change in the richness of the exhaust.

Would playing with the oval shims cure it  or does the pump need to come off?

naj
68 280SL

ja17

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Re: Running very rich
« Reply #1 on: March 01, 2009, 23:35:54 »
Hello Naj,

Make sure that the WRD is not stuck, make sure that the linkage is correct. The llinkage lever on the injection pump should be on its stop at idle.   

Next remove all the oval shims if it is still rich.
Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback

Naj ✝︎

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Re: Running very rich
« Reply #2 on: March 02, 2009, 09:03:03 »
Thanks Joe,

The linkage and throttle valve are correctly set, and the pump lever is at its stop when idling.

I will check the wrd at the next opportunity.

naj
68 280SL