Check engine light came back on after new spark plugs and coils, Help - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 02-23-2012, 12:21 PM Thread Starter
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Check engine light came back on after new spark plugs and coils, Help

Yes I recently purchased my 97 E420 only 4 months ago and this car only had 1ne owner. I think my friend put 87 gas and some octane booster in my car and now they check engine light is on. I never had a problem with this car until the car got some 87 gas in it. I took the car to Merchants and spent 436.00 for them to put new spark plugs in the car, the old ones looked so bad like they were the originals. This car only has 130,000 miles on it, so I put some sea-foam in the gas tank and the engine stills runs rough but it seems like it helped a lil', but my check engine light came back on after I disconnected the battery several times. Someone at autozone told me that it might be some wiring to the spark plugs that are bad? After new spark plugs the check engine stills reads misfire on cylinder 3, the guy at merchants said he took the spark plug from cylinder 5 and put it in cylinder 3 and the computer still said misfire after new spark plugs. I think there is still bad gas in the tank and I even added another octane booster, check engine light won't go off. Does anybody know what I need to do in order for my baby to start running smooth again? Please help me, thanks!
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post #2 of 2 (permalink) Old 02-23-2012, 01:48 PM
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Um, welcome aboard.

Please click user cp and edit details so you can add your vehicle and location to your profile, that is often useful information when you're seeking assistance.

The first question I have is: WHAT are the codes? The CEL comes on for a reason, and that's to tell you it's diagnostic time, not clear-the-codes time.

Now, that said, these engines are notorious for developing misfires due to the spark plug connectors. A set of them is not expensive online. So if your code is for a misfire to cylinder 3 I would probably start with connectors. If you can find a set of wires that includes the connectors that's probably cheaper overall anyway, since those are probably the OE wires, too.

Lastly, please come join us in the W210 forum. There is lots of information about the 210 generally and your car in particular. The "general" forum is just that: general information regarding the world of MB vehicles, nothing specific about your car.

Good luck.

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)
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