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#1
08-29-2013, 04:55 PM
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Very balky 300SL
My 1991 300 SL (M104 engine) virtually stalls when I try to accelerate during warmup. It starts well and runs fine for about five minutes. Then it continues to idle well, but will not accept much increase in throttle opening. If I try to open the throttle, the engine stalls and is very hard to restart. After a LONG warmup, 15-20 minutes, it runs OK again.
I have done all the tests I can do with a multimeter. The throttle switch is OK, the throttle position sensor seems to work, the airflow sensor works. There is continuity to the EHA. The only thing I find wrong is that the duty cycle measured at the test connector does not vary with the airflow sensor position. The test procedure I have seems to make the airflow sensor/duty factor test an alternate to the throttle position/duty factor test, and that works fine. So I don't know if I have a failure or not. I sure will appreciate the advice of anyone with CIS-E experience. Bob D. 
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#2
08-29-2013, 06:15 PM
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Do a fuel pressure test. These have 2 pumps plumbed inline, if one goes out pressure will be very low. ( I think max pressure on CIS is 100 PSI with typical 60 ? ) Feel both pumps to see if they are running, also do a amp draw on each.
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#3
09-02-2013, 06:41 PM
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I changed the EHA to cure a similar problem.
__________________
 Present 1987 300SDL 1991 300SL 1990 560SEL 2001 ML320 Past 1969 200D 1979-82 1983 300SD 1984-85 1972 250C 1982-02 1995 S350 2011 1997 S320 2012
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Linear Mode
