BenzWorld Senior Member
Date registered: Apr 2005
Vehicle: 2005 S55; 2003 ML350; 2002 C240; 1997 C280 Sport; 1991 300SL; 1986 190e 2.3 16V (2); 1968 W30 442
Location: South of the North Pole
Mentioned: 0 Post(s)
Quoted: 11 Post(s)
Multiple codes stored for misfiring #6 - help?
Thanks in advance for any suggestions.
Car is a 2002 C240.
Symptoms now - clear the codes and shut off CEL, and engine runs great. Or, do not clear the codes and after a couple of starts CEL is still lit but runs great. Sometimes the CEL will clear itself after a number starts.
If I stomp the gas peddle, runs slightly to heavily rough, sometimes not like I've completely lost #6 (see below), but certainly not firing all the time, all the way to it's been turned off completely.
Or, if I jump on the highway and drive conservatively, and with the CEL cleared, I can drive 15-20 miles, but then CEL lights and I do feel a miss at that point, but drives well, and still get 26-28mpg.
Or, city driving after clearing the codes or the automatic reset ?) it does, after a few stop lights, I get slight vibration, CEL lights up, and then tends to become a heavier vibration with each subsequent stop. Almost like a bad EGR? No EGR codes, and no other cylinder misfires?
Using a Launch GDS as the diagnostic tool, here's what the print out shows.
P2050 - Misfiring damages TWC (see current valid STIP) (P0300)
P2054 - Misfiring of Cylinder 6, damages TWC (see current valid STIP) (P0306)
P2043 - Misfiring (See current valid STIP) (P0300)
P2047 - Misfiring of Cylinder 6 (See current valid STIP) (P0306)
I've changed coil packs, changed wires, changed plugs on #6. It's all new within the last 2 weeks.
About 6 months ago, I replaced the MAF, then found the MAF gasket and the elbow that connects it to the TB had a bad gasket, so replaced those. Also replaced the vacuum hoses in the area. Those fixed the rough running at idle up until a couple of weeks ago when my new problems started.
Any ideas? Could this be caused by a bad injector, and if it was bad injector, shouldn't I get a code for that?
Any ideas / help would be appreciated.
1997 C280 Sport
1986 190e 2.3 16V (2)
1968 W30 442
1988 46' Cougar US1 with Triple blown 572s
Warming the Globe, 24 Cylinders at a Time
Point me to a 126 wagon in the States PLEASE!