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Old 08-26-2003, 09:31 AM
endeavor endeavor is offline
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Join Date: Feb 2001
Posts: 84
Erractic hiccup at idle in 300CE

I have a 1990 300CE and generally when it is hot outside, the car at idle under load has an erractic hiccup and actually shakes the engine, 104.980 engine -24 valve.
This hiccup or miss comes and goes. Putting 93 octane or 89 or 83 does not make any difference.
I have replaced all the ignition components, new plugs, wires, fuel components such as distributor, injectors, fuel pumps. I also checked for all vacuum leaks and fixed all of them.
The thing I have not checked is the fuel pressure regulator, fuel pressure, throttle valve switch or the plate.
What am I not sure is it whether the electrical or fuel related?
I am quite handy, so if some experts on MB can help me, would be great.
Any advice would be great.
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