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Originally Posted by 300ESUPER
I have posted this problem before and I have gotten some really great advice. My 1989 300E has a problem shaking when I start it up. The rpms do not hold. I have to press the gas pedal to keep the car on high idel so the car does not shake and sometimes the car stalls. I have to start the car 2 - 3 times to get the car to stay on (this happens sometimes). After driving for a couple of minutes the car is great. When I get to where I am going I will turn the car off. I will get back to the car after 20 min and the car starts up great. When the car is sitting for a couple of hours the problem comes back. I should mention that there are some times that the car starts up great, this is usually when it is a bit warmer outside but not all the time.
This is a list of parts which I have changed in the last couple of months:
Distributor rotor
Distributor cap
Voltage protection relay
Water temp. sensor
Battery
Neutral saftey switch
Fuel filter
Both Fuel pumps
Please help!!!
Fab
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fab, I previously owned a 1991 420SEL. When it develpoed a rough idle upon start up, the dealer suggested throwing parts at it, to the tune of $2k. I rfused and instead took the car to an indie.
The indie perofrmed a leak down test and found that one of the vavles was sticking open when cold. He inserted soe sort of metal shimmie and the valve was working better. the best thing, no rough morning/cold idle.
I am not exactly sure of the explanation above. all I know is:
1. He did a leakdown test
2. He inserted some sort of shimmie on one of he valve springs
3. The rough idle went away forever
4. It cost less than $200.00 (as opposed to $2k)
Have your indie try it.