Mercedes-Benz 190-Class - Recent Questions, Troubleshooting & Support - Page 2

black smoke is flooding( uncontrolled injector operation run the fault codes to determine the problem area ( ECM , fuel pressure , faulty injector control, MAF/VAF sensors or failed heated oxygen sensors

check fuel injectors for dirty , fuel filter

Have you checked your OVP relay? They can be troublesome for sure. It's located behind the battery under a plastic cover. It'll be the tall relay with the aluminum housing, has a fuse on top, check the fuse first. If the fuse is good then pull the relay and give it a shake, it's not supposed to rattle, good sign it's bad if it does. Sometimes moisture can get back there and cause corrosion to the relay pins and connector. If it pulls out hard then I'd suspect to see some corrosion, most all mercedes electrical connectors are silver plated and turn black when oxidized. If so clean it up by lightly scrubbing with a scotch pad. I've had problems with them before and had luck repairing them myself by removing aluminum shell and reheating all the sauter on pcb carefully. If the printed circuit board looks burned in any way there's a possibility that the electronic components may be toast. May be easier to buy a new ovp relay but they can be pricey. The OVP relay is one of a few possible culprits to your issue, best case scenario imo. Worse case your cylinder compression is too low. Could be a cold start valve issue too. Hope this helps.

Sounds like a bad or dirty injector take injectors out and check and clean

Hello My Fixya Friend, Such things happen in winter seasons. Still if you have any doubts just visit the link I provide to you. They will guide you properly that what has happen to your car, and they will give you the solution for the same. Best Manuals

Two types were used .On this engine ,but not both together. One was round wth 4 round contacts inside ,And one that is colured green, i think if i am right .This has two contacts .Both on the top of the block on the inlet side of the head at the back.Removal is just to unscrew to extract it, If your not sure and dont know get firther help .

Here's a link on changing your tensioner and belt. Mercedes Benz Belt Tensioner Replacement

engine coolant temp sensor for engine control management out of range easy replacement its fitted in the cylinder head i think ? its a common fault hope this helps.

Check to see if your car's brake lights are working. If they aren't, it's your brake light switch located on your brake pedal.

The car needs to "sense" that the brakes are being pressed in order to release the shift lever.

Brake light switches are a pretty common failure item.

Make sure to get a Mercedes switch, the other brands are even more problematic.

Hope this helps.

You do it whatever way works, keep at it you are doing it the best way I know of. If you can't get it out call a locksmith.

A bit of a vague question but if it's overheated, I'd suggest a new head gasket and skimming the head