Author Topic: Engine Stalling after "hard acceleration"  (Read 4217 times)

Col Webb

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Engine Stalling after "hard acceleration"
« on: September 15, 2012, 23:32:38 »
I have a 230 SL with 250 head and later model fuel injection pump.  Ive cleaned the fuel tank, replaced the fuel pump, replaced the fuel filter, replaced the spark plugs with a higher temp model (due to buildup). Engine is running rich but mechanic has been unable to fix. Cold start valve appears to be ok.  The engine will stall after hard excelleration if gas pedal is released.  Thereafter engine is hard to start (as if no fuel) pumping gas pedal help start. Once started engine runs ok. Any help would be appreciated. Thanks Chuck
« Last Edit: October 25, 2012, 00:00:49 by 280SL71 »

ja17

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Re: Engine Stalling after "hard excelleration"
« Reply #1 on: September 16, 2012, 02:15:44 »
Hello Chuck,

Make sure that the engine linkages are ok. Go through the "linkage tour"   Verify that the engine is running rich by doing a "split linkage test" at different RPMS. Make sure all the other tuning items are correct.

If the  engine does still run rich at all speed ranges, you can remove some shims from under the "baro compensator"  or adjust the IP rack to lean the mixture in all speed ranges. Let us know if you are familiar with these procedures.
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

Col Webb

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Re: Engine Stalling after "hard excelleration"
« Reply #2 on: September 19, 2012, 00:02:53 »
Joe, Thanks for the response. I dont know the procedures but will go through the linkage tour. Does it explain the tests? Thanks Chuck

ja17

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Re: Engine Stalling after "hard excelleration"
« Reply #3 on: September 22, 2012, 01:26:08 »
Hello Col,

Look over the information then get back with us with lots of questions. We'll be around.
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

Col Webb

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Re: Engine Stalling after "hard excelleration"
« Reply #4 on: October 24, 2012, 23:46:49 »
Thanks for the help, did the linkage tour. They were out of spec. Running much better now with no stalling. still smells like running a little rich. Chuck

ctaylor738

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Re: Engine Stalling after "hard acceleration"
« Reply #5 on: October 25, 2012, 18:41:51 »
I'm the guy who tested almost everybody's tail pipe CO at the last PUB.  Trust me, you can't rely on smell to determine if it's a "bit rich."  Find someone with a Gunson Gastester or equivalent, and find out what's really going on at idle and 3000 rpm.
Chuck Taylor
1963 230SL #00133
1970 280SL #13027 (restored and sold)
1966 230SL #15274 (sold)
1970 280SL #14076 (sold)
Falls Church VA