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#1
07-09-2008, 04:57 PM
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90 300SE stalls at idle after 5 min, then ok after 10
I have a problem that I hope you guys can recognize easily.
The car starts fine and idles fine when cold about 1100RPM. After about 5 minutes of running it idles poorly and sometime stalls when i stop. However after it's completely warmed up, it idles fine around 700. It runs smooth at all times at high speed. When it's about to stall, I notice the economy gauge jumps up about 20%(less economy), When it's about to die, the RPM's drop to about 500, if it doesn't stall it jumps up to about 1200-1400 momentarily. Again, it runs fine when completely hot. 
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#2
07-10-2008, 08:16 AM
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Sounds like a problem with the air flow position sensor, try searching here for similar stalling issues.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#3
07-10-2008, 09:06 AM
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Thanks, I'll look into that, but if the AFS had a problem, wouldn't it cause problems after the car is warmed up?
__________________
91 300SE 150k 90 300SE 103k 89 300E 106K 86 Cimmeron 54K 97 T&C 140K 94 Lesabre 160K 00 LS 155K 71 Corvette 48K
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#4
07-10-2008, 03:15 PM
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The air flow sensor- Is it the black rectangular piece that is about 3"x1.5"x .5"? with a connector on it. i couldn't see how to remove it? Is it a pot that I can test with an ohmmeter? Have you seen this behave strangely, but then work well when the engine is hot? I guess i"m not convinced that it's the problem.
__________________
91 300SE 150k 90 300SE 103k 89 300E 106K 86 Cimmeron 54K 97 T&C 140K 94 Lesabre 160K 00 LS 155K 71 Corvette 48K
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