20 Most Recent 1990 Mercedes-Benz S-Class - Page 5 Questions & Answers

If the bearing has been overtightened, the rollers will mark the hub and a rumble will be heard at low speed.

Mercedes-Benz... | Answered on Nov 18, 2017

Stop light switch is very common for this symptom, if the bas release switch has a stored code the whole break booster will need to be replaced.

Mercedes-Benz... | Answered on Nov 14, 2017

If its an auto box check oil lvl or do a transmition oil and filter change most mercs are bullet proof and its normally daft things that make them go wrong

Mercedes-Benz... | Answered on Nov 07, 2017

You shouldent have to just keep filling the rad up and sqweez the hoses the rotation of the water pump will remove the air so just fill and sqweez

Mercedes-Benz... | Answered on Nov 07, 2017

Normally tiney rattley noises are just heat shields that have come loose check under the bonnet and under the car for loose heat shields also the heat shield around the cat can corode and come lose hopevthis helps ivan

Mercedes-Benz... | Answered on Nov 07, 2017

Some Mercedes models have two batteries. If you were not the original owner you may not know this. Why two. The extra battery operates the starter even if the main battery goes dead. The extra battery is usually located under the cabin filter in the engine compartment. It is a special battery (small) like a motor cycle battery. It has probably died. Check your owners manual as locations may have changed. It is about 100 fix if you change it yourself.

Mercedes-Benz... | Answered on Oct 04, 2017

https://www.manualslib.com/manual/557086/Mercedes-Benz-Slk350.html?page=292 or

and choose option

Mercedes-Benz... | Answered on Sep 24, 2017

It has been a long time but I seem to remember the K Jetronic is adjustable but the adjustments are normally sealed from view. I don't have the information to hand.

I also seem to remember the system used a separate enrichment device for cold starting and warm up which could perhaps cause idle problems if it isn't working correctly.

Considering the age of the car it would be wise to employ best practice and examine the basics first. Clearly considerable maintenance has already been carried out but you didn't mention a general tune-up where the ignition timing and valve clearances are checked, the engine breather, throttle body and fuel distribution metering unit is cleaned.

It would be well worth checking for intake air leaks especially through the brake booster. If the intake valve seats aren't in virtually perfect condition each combustion can leak into the intake manifold and cause the next incoming charge ineffectual. Only a cylinder leakage test can diagnose this.

If no other fault is found the quality of the injector spray pattern must be tested. If an injector isn't spraying correctly and the engine is running too slowly for the incoming air to break up large fuel droplets the burn will be impaired and although it will behave as a weak or lean mixture, much still burning fuel will be expelled through the exhaust valve.

Mercedes-Benz... | Answered on Sep 02, 2017

in fuse box , engine compartement , left side

Mercedes-Benz... | Answered on Jul 08, 2017

Right side turn/brake light wire is green. Running light wire is always brown on all four cornets. Left/drivers side turn/brake is always yellow. This is pretty much a universal standard.

Mercedes-Benz... | Answered on Jun 26, 2017

There is a relay thats conected to the pump in the boot if this goes it doesent open also if the relay has gone it could be because its putting the relay under strain causing it to blow this could be due to a faulty pump or lack of fluid or leaking in the system

Mercedes-Benz... | Answered on Jun 23, 2017

I'm not a car mechanic, but, it sounds like you might want to check the fuse to the ignition switch, and, if that fails, it might be a problem with the Start Safety Switch on the transmission. Good luck.

Mercedes-Benz... | Answered on May 03, 2017

Not nearly enough information and this is not a problem you are going to fix on a computer web site!

Mercedes-Benz... | Answered on Apr 15, 2017

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