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#1
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1991 300SL HEsitation
Hello all,
I am having a hesitation problem with my 1990 300SL (CIS fuel injection). Here are the details.. what should I look at next??? Problem: -Hesitation when accelerating from idle. -No problems with starting engine, idling, or once car has started moving. Accelerating from 5mph-60mph is perfectly fine! -Anything other than light pedal pressure causes it to bog down for a second before it accelerates. Hard acceleration causes it to stall! Conditions: -Happens consistently all the time (cold weather, just after starting, when fully warmed up, etc, etc.) Thanks Tom |
#2
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Throttle Responce
First thing i would do is have your Throttle cleaned if you haven't already. Buy Throttle (Not Carb!!!) cleaner and spray into the throttle to dissolve grease/ grime that has built up and could be causing the throttle plate to stick on initial accelleration.
Second, I would check your Coolant Temp Sensor. It is located on the top of your water pump. I was experiencing the same problem with my M104 engine and it looks like it was the coolant temp sensor after all. Between those 2 updates, you should be ok. Be aware, in a very rare circumstance, it could be early signs of a failing ETA (electronic throttle acuator)- but i don't believe it is this due to the fact it is only hesitation on accelleration. Lots of luck, and remember- Only buy the throttle cleaner! Do not buy the Carb/ Choke cleaner that is available. They are not the same product!!!!
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My Work: Mercedes-Benz Manhattan, Inc. Business Development 536 West 41st Street New York, NY 10036 -My Garage- 1996 E320: White 118,000 miles ~Dad's Driver~ 1996 E320: Green 109,000 miles ~Mom's Driver~ ~My Babies~ 2000 SL500: Desert Sand 96,000 miles -Previoulsy Judge Judy's- 2008 E350 4MATIC Sport -Flint Grey/ Ash/ Black Birds Eye Maple- |
#3
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Ps!!!
Check the Air Mass Meter that is plugged into your intake pipe that goes to the air-cleaner box. I don't believe you have an Mass Air-Flow Meter as a seperate unit (that came in 1993 3.2L M104 engines). The Air Mass Meter could be failing and not being able to tell the engine management system how much fuel/ air to mix.
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My Work: Mercedes-Benz Manhattan, Inc. Business Development 536 West 41st Street New York, NY 10036 -My Garage- 1996 E320: White 118,000 miles ~Dad's Driver~ 1996 E320: Green 109,000 miles ~Mom's Driver~ ~My Babies~ 2000 SL500: Desert Sand 96,000 miles -Previoulsy Judge Judy's- 2008 E350 4MATIC Sport -Flint Grey/ Ash/ Black Birds Eye Maple- |
#4
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Thanks
I will update, I apprecaite your replies.. Tom
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#5
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I always thought that stumbling at idle to 10 MPH was due to a vacuum leak. (air/fuel mix ratio too lean at throttle open). Be shure to check for vacuum leaks before you start throwing parts at it.
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