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  #1  
Old 08-04-2006, 01:09 AM
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Rough Idle until 1000rpm, slight vibration in gas pedal at 55mph/2000rpm on highway

Hello all,

I just purchased a 1988 560SEL from a private owner and drove the car home nearly 1500 miles. I had the belts and fluids replaced before I left for home. None of these problems were evident where I purchased the car so I wonder if the heavy driving made the seals on just about everything (lol) leak? I did use 87 the first time I filled up (but past 1500+ miles ahve been all 91) so I will try injector cleaner the next time I am low...

Engine runs rough when it has been running. It seems worse hot than cold. Also the starter takes too long sometimes.

I replaced all spark plugs and wires, the two closest to the firewall were pretty grimey/caked in oil. I wonder if the valve seals are leaking? Is replacing these a do-it-yourself job? Would just replacing the valve cover seals solve anything?

Also I am led to believe a fuel issue contributes- I can smell fuel when using the air conditioner at low speeds and fuel near the rear of the vehicle. I will replace the fuel filter as soon as I can find one (rare in small towns have to special order). However would the fuel filter have anything to do with the smell from the air conditioner since its near the rear of the car? Or do I have a bad distributor or E.H.A. valve too?

One last thing- there is a slight hesitation/vibration in the pedal at around 2000rpm/55mph on the highway, but when I speed up it tends to go away.

Thanks for any suggestions-

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  #2  
Old 08-04-2006, 01:23 AM
dkveuro's Avatar
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Join Date: Jun 2003
Location: Here an' there.
Posts: 2,548
False air leaks.
Cylinder balance.
Injector fault.
Timing chain stretched.
Low fuel pressure.
High fuel pressure.
Crank sensor.
Coil output low.
Carbon on back of intake valves.
Worn valve guides.
Bad valve seats.


Hmmmm.....

Drive line wear.
Drive line imbalance.
Trans' mount.
Engine mount.

'sit ..I think.



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Old 08-04-2006, 03:55 AM
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Thanks for the suggestions--- I guess I am under the belief from your post that it could be just about anything? Should I just replace as much as I can afford or do you think taking this to a mechanic would be the best idea? I am a college student and do not have that much money (shutup I know its a 560SEL with bad gas hehh but who could resist?).

Any help is appreciated.
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  #4  
Old 08-04-2006, 11:41 AM
dkveuro's Avatar
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Location: Here an' there.
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Find tech who is familiar with vehicle.
Ask them for a check over of the engine and drive train.

Tell them, you do not need any repair work done until the vehicle is mechanically evaluated.

Let the forum know what they say.


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"A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money."
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  #5  
Old 08-07-2006, 09:19 PM
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Update:

Fuel is slowly leaking out of the filter/pump/acumulator area.

My new fuel filter should be arriving on Wednesday and I will further troubleshoot the exact location of the leak and post the information here - I am hoping this will solve it.

As far as MX goes for a Mercedes in my town.. well the nearest experienced MB tech is 6 hours away
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  #6  
Old 08-10-2006, 10:00 PM
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Okay. So I changed the fuel filter and everything seems to be in order now (rust coloured fuel came pouring out ) The idle seems to have improved but I have yet to drive more than 5 minutes because I still am leaking out one of the fuel pumps.. slowly... Does anyone know where to buy the gaskets/seals online? I am having no luck at all and do not really want to pay $250 for a new pump.

Thanks!

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