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#1
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Help with poor running ML
Hi, long time lurker here but asking for help, now. I have a 2000 ML320 that has basically been trouble free. It has 89,000 miles and has suddenly started running really bad. No warning, it just happened. The CEL came on and the engine started running really rough, like it was not running on all six cylinders. I drove the car home and could only achieve about 40 mph in 2nd gear, floored. I hooked up a OBD-II reader and got P0100, P0110, P0300, 301, 302, 303 and 306. I replaced the MAF sensor. I cleared the codes and started the car again. Immediately got a P0302. I swapped the ignition coil from cyl 1 and cyl 2. I cleared the codes again and started the engine, P0301. I bought a new coil pack and replaced the one on cyl 1. No change, the car still runs bad. If I try to drive the car, I get P030* codes on just about all of the cylinders. Plugs are original but look clean and are gapped right. Wires are good. Right Cat was replaced about 8 months ago. I'm stumpped and looking for advise. Help please......
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#2
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Plugged cat?
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Ric Ann Arbor 2000 ML320, 172k If you think education is expensive, try ignorance. |
#3
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I would try replacing the plugs. My car has 96,000 miles and all of the sudden it started running like crap one day about 1000 miles ago. I looked at the plugs and they looked alright, but I replaced them with NGK Iridium IX (or something like that name) and the car runs muuuuuch better. one wire was bad on my car so I just opted to pay the $190 and replace all the wires. They just arrived yesterday so I have not installed them yet, but it should fix all rough running problems.
at 89,000 miles your car is due for a plug change, so I would try that first and see how it goes. |
#4
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Thanks for the replies. I gave up on the car and sent it to the dealer. I actually had to have it towed because it would not move under its own power. I talked to the dealer today. They're not sure what is wrong with it but said that they have to replece the plugs and wires to rule them out as a problem.
I guess I cannot complain, this is the first repair that I had to pay for. I know that others have had issues with their ML's but ours has been a good car so far. When I hear what the solution was, I will post it here so that others here may benefit in the future. |
#5
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Last I was at the dealer they wanted $500 to replace the plugs, not including the wires....OUCH....(dealer in Ann Arbor, Michigan)
__________________
Ric Ann Arbor 2000 ML320, 172k If you think education is expensive, try ignorance. |
#6
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It was the MAF. The new one that I put on was apparently bad. Dealer replaced the plugs, wires and MAF. All together, plus towing was $1800. I'm okay with that, I guess, but my wife was rather shocked by the repair cost. I can usually fix anything so we're not used to shelling out that kind of money for auto repairs. Well, live and learn...
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