Hey, i have 1992 300ce 150k miles, 3.0L m104.
I had a sound system in the car, it was 1200watts rms, 2400watts peak.
Acdelco battery 775 cold crank amps.
Aftermarket alternator, I think it was at 70amps.

Okay my problem is the throttle adjustment is completely off. When the car is cold the idle is 700-rpm. When worm it will drop to 500-rpm in park and 450-500-rpm in drive. Now at these low rpms the alternator does not charge my battery (all my dash lights turn on) when i accelerate the lights go away and it charges. Now while i'm driving the the battery goes to about 13.5 volts, when I come to a stop it goes down to 12 volts. When I change my battery it last for about 4-5 months, then after that it goes from 13.5 volts to about 10 volts, then my battery just dies.

My shifting is off as well, at full throttle the car starts to slip at 4500-rpm until i let off the gas so it upshifts.

Now my ideas are to adjust the throttle linkage and kick-down cable, FIND a high output alternator and a good battery.

Any ideas, suggestions, tips or something. I have been dealing with this problem for about one and a half years now, It seems like no matter what I do the problem wont go away.

My budget is very small too, since I'm a full time student

Thanks in advance.

When was the belt tensioner last changed? Does the belt slip? Do you even have the proper belt?

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Allen Kroliczek
Oak Grove Autosport | Oak Grove Autosport
01 G500, 82 300TD, quite a few more.....

The slipping comes from the transmission.
Sorry for not clearing that up from the start

If the transmission is slipping then you have another problem on your hands. Is the fluid topped off and at the correct level? When was the last time the fluid (all of it) and filter been changed?

I was referring to the accessory belt. If the alternator isn't charging at idle (which it should) then you may have a weak belt, or don't have sufficient tension on the belt. These cars don't have sufficient electrical systems for big sound systems. If you made it work, all the better for you.

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Allen Kroliczek
Oak Grove Autosport | Oak Grove Autosport
01 G500, 82 300TD, quite a few more.....

I have the same engine. The idle speed is NOT controlled by the throttle linkage. Any attempt to raise the idle speed by 'tightening' the linkage (and thus opening the butterfly valve) will result in misery.

Start with the basics. Are all ignition components in a good state?

Are air and fuel filters in good order?

Is the fuel delivery 'duty cycle' adjusted correctly?

Search these forums for clues. That's what I did after undoing the throttle linkage adjustment that one bright lad tried on my car to stop it stalling.

The best to all.

RayH

mercmike32, check the condition of the voltage regulator brushes. As you probably know the voltage regulator attaches to the back of the alternator with 2 phillips head screws. If the brushes are worn to stubs simply replace the voltage regulator.

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Fred Hoelzle