20 Most Recent 1998 Mercedes-Benz S-Class - Page 8 Questions & Answers

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.

in fuse box , engine compartement , left side

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.

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

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.

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

starting up is way to slow fuel pump pressure down or EFI system fault , a faulty starter if that all checks out the 4 day to flat battery parasitic draw from alternator , starter solenoid or starter motor or ignition switch you can buy quick release type battery terminals like used on marine boats charge the battery up and disconnect the battery terminals until you want to drive the car again when back home undo the battery terminal