The car has had major motor overhaul, everything....but I think the fuel injection is bad.....car starts up perfectly, when it gets hot....after running awhile, it starts running very rough and black smoke out exhaust, uses tons of gas....smell gas and gas in oil....what is going on HERE? Car has been completely restored, but cannot drive any distance due to this problem....and I paid a mechanic $4600.00 to restore the motor....will not go back there....no no no.....should of put new motor in this old classic I inherited from family estate...now it will not hold a charge...new battery....Alternator? Please help....Harold T. Holmes....HTH Interior Designs, Inc. Wheeling, WV

SOURCE: ROUGH IDLE,WET SPARKPLUGS,KILLS

The Symptoms tell me it is a head gasket. A leaky or bad head gasket would cause all of the problems that you mentioned.

Burning water causes White Smoke, Burning Oil causes Black Smoke. The oil and water are mixing with the gas in the cylinders and causing it to run bad. Pull out the dipstick and look at the oil on it. Does it look like good oil? Or does it look watery and or foamy or grey colored. Open up the radiator and look inside, do you see oil?

This seems almost text book to me... I would have someone local to you to have a look at it to be sure.

SOURCE: '83 300D turbo desiel w/ 236,000 miles & smokes heavy at start up

cylinder head gasket???

SOURCE: 2001 Mercedes E220 CDI exhaust black smoke on acceleration

hello,according to service information;smoke formation or si 07.16-p-0004a (service inform) from mb ,your engine have normal function,if you want ,ask your dealer about the service inform with number 07.16-p-0004a,you can read the explanation regarding your problem,ty

SOURCE: 2003 Mercedes C320 coupe. Car died on my way home

Hi ddansvob-

Most of the codes for Mercedes C320's can be cleared (at least temporarily) by disconnecting the negative terminal of the battery and leaving it disconnected for at least 1 minute. I would give it several minutes just to be sure.

There is also a reset procedure that you can use that involves disconnecting the battery, turning the ignition to position 1 several times and then reconnecting the battery. That procedure can be found with a google search.

Possibly the easiest way though is to visit an Autozone or other similar store that has an OBDII scanner that they will use for free on your car, and have them reset the codes. If there is an actual issue with a sensor, etc. though, the code will come back up after the car has been started a time or two. If that is the case, you are going to have to troubleshoot the actual cause of the code, involving finding a Mercedes shop that will help you with identifying what sensor(s) are causing that code to show up.

If your mechanic used non-OEM parts/battery, that is very likely to be the source of your problem. Assuming that they didn't do that (which would be unusual for any mechanic to do), you are likely looking at replacing a voltage sensor or part of the voltage regulating/distribution system. If you get to that, you are REALLY going to need an experienced Mercedes mechanic.

Good luck!

SOURCE: 85 300D / Engine idles rough

try an oil check.