Diagnostics - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 01-30-2015, 11:26 AM Thread Starter
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Date registered: Jan 2015
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I have a 1985 TD which has trouble going uphills a bit. I drive the car mostly in LA, which is flat, but notice the issue a bit on the way to Vegas or Santa Barbara, for example, where there are some hills to get through. The car does not stall completely. It simply decellerates. So if I'm pushing the gas pedal at 60, and it is on 60 on flat terrain, it decellerates to about 45, maybe even down to 35 with my foot having to press very hard on the pedal to keep it going. With this issue in mind, I'd be terrified to bring this car to a place like San Francisco.

I had one instance where the car stalled completely in extreme Vegas heat (it was about 105 in beginning of July). It was running very loud at that point. I had the filters swapped out and a line changed, but am wondering if that stalling instance is related to it's issue of going up hill.

I had my mechanic in LA check it, and he said it runs just fine maybe because he's not really the type to go out of his way to find issues that may or may not be there, and also, of course, because LA's terrain is mostly flat.

One more thing, I seem to need a new alignment pretty frequently as well as new tires. Like every six months, and I'm not driving very far at all. Can that be the suspension? Or what else can cause the car to remain slightly out of alignment?
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post #2 of 3 (permalink) Old 01-30-2015, 03:13 PM
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Date registered: Nov 2008
Vehicle: 1981 300TD 310k--1966 230 165k--1970 280se 172k
Location: Ohio City, Ohio
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Your lack of power sounds like a fuel delivery problem. If you have replaced the filters(both of them), you may consider checking the tank strainer. Are there black spots visible in the clear primary filter? Do you get a hiss when you remove the fuel cap? Once the tank strainer is verified clear, it might be a good idea to do a diesel purge to clean gunk out of the system.

When was the last time a valve adjustment was done? How many miles on the car? Your injectors may need rebuilt.

The alignment problem is probably worn components in the front suspension. There are many rubber parts in the suspension that fail and cause the alignment to wander. Have the alignment done at the Mercedes dealer and be sure they check the suspension components for wear/slop.

1981 300TD--310k miles
1970 280sel--172k miles
1966 230--162k miles
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post #3 of 3 (permalink) Old 01-31-2015, 09:08 AM
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clean the fitting at rear of intake manifold where the small plastic line go to , also if you follow that line , it goes to a solenoid on the firewall , disconnect and bypass that solenoid .
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