Check engine light comes on intermittingly - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 03-09-2010, 10:44 AM Thread Starter
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Check engine light comes on intermittingly

Hi there. I have a 2002 ML320 and I'm having some issues. At times the engine runs smoothly and all is fine, when I'm stuck in traffic, the engine idles at 500-700 RPM and seems to sputter (for lack of a better term). This causes the check engine light to illuminate and it will stay on for the rest of the drive and will also be on when I start the car again. The next day when I start it up, it will be off and then when I'm stuck in traffic, the engile will idle rough again and the process repeats itself.

I had spoken with a few people and they said that maybe I had bad gas in the system and was told to buy octane boost and fuel injector cleaner.

I'm sorry if this has been posted before, I'm just looking for some solid advice before taking it into a shop.

Thank you, Mark.
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post #2 of 5 (permalink) Old 03-09-2010, 11:00 AM
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How many miles are on your car, on the spark plugs and on the fuel filter?

Fuel injector cleaner will not hurt anything and it's worth a try (MB approves of Chevron Techron and they have a private labelled product available from dealers). I don't know what effect the octane booster will have. If you noticed your CEL right after refueling, then you can suspect bad gas. If not, then that's not it.

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post #3 of 5 (permalink) Old 03-09-2010, 11:12 AM Thread Starter
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Hi Musikmann, I am flirting with 142K miles on the car right now. The spark plugs and wires were replaced 2 years ago.
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post #4 of 5 (permalink) Old 03-09-2010, 12:04 PM
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Hello back Silver ML320. We have the same engine and our fuel filters were both due at 60,000 miles or 4 years but I let mine go 8/80,000 with seemingly no ill effects. A restriction in fuel flow might explain your symptoms. Also, oxygen sensors are a common cause of a CEL and Bosch says they have a lifetime of 100,000.

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post #5 of 5 (permalink) Old 03-09-2010, 08:55 PM
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