1995 E320 Runing Rough
 

I have a 1995 E320 with 180K miles. Ive had the car for 6 years. Its running rough. I did the self diag. button and it pointed to MAF sensor. Code 4&10. I changed the MAF sensor and cleared the codes. It still runs rough and its giving me code 10. MAF sensor. I just built the code reader and got the following codes 10 Pin 8 4&13 Pin 14 2,5&11. Im not quite shure what to do next. The venor I got the MAF sensor is going to get me another one not sure thats the problem. Any ideas?

Has the engine wiring harness been replaced?

Yes about 4 years ago

Have you checked your ignition coils, sounds like one or more cylinders may not be firing.......

No I havent but it runs ok at cruising speed. 75mph. but rough acceleration. I checked the plugs and they all look lean light brown. Can coils be intermitten?

The short connector under the coil has been a source of problems. They are rather cheap and easy to replace. But I would first replace the spark plugs if they haven't been changed since you replaced the MAF.

Ill but a set of plugs and wires next it need the anyway

Don't replace the coil wires. They are rarely the problem.

Replace the connectors under the coils. They are usually the problem. Here is a quote from a post by Arthur Dalton:

"Ok ..here is what to look for on those connectors..[ just the ones under the coils].. They don't "snap connect" to the plugs like the other 3 wire lead plugs that stand alone ..and b/c they are under the coil, benz used a simple spring arrangement that just pushes down on the top of the plug connectors from the force of the seated coil..not a good connection set-up, but I see why they did it with the coils being on top of the plugs...anyway, if you look in there and see any heat fatique or grayish ash type residue, or spring degeneration on that spring and connection, that is where the failure and misfire has/is occurred.. look for any carbon type tracking right there and around the plug base....an ohm reading of the connector does not address this condition. Each coil fires 2 spark plugs at the same time [ Waste Spark System] in Series, so a poor connection at this point will cause a misfire very easily ..which is why most Techs [ knowing this failure rate] just change those 3 connectors when changing plugs. As I posted earler, once the HFM [ ignition] module sees this misfire , it cut off injection, so the misfire is pronounced and often erratic. A scope does pick these up , but if one does not have that, a close look at those connections may show the condition.. I am pretty sure I advised you when you did the harness to go with the Bosch Super Coppers , so it is most likely that you do have/ did go w/F8DC4's ..and I only stress that point b/c 104 are very fussy about plugs being a Waste system.. and they HATE plats!!!!"

Thanks for that. I wont change the wires just the connectors under the coils
and plugs

Good....Arthur Dalton is your best friend for your chassis. Check out his posts and you'll usually find your answer.