97' c230 w202 misfire codes - Mercedes-Benz Forum
 
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post #1 of 5 (permalink) Old 03-04-2015, 12:05 PM Thread Starter
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Date registered: May 2014
Vehicle: 1997 c230 C class w202
Location: Vacaville CA
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97' c230 w202 misfire codes

I have no idea if Im doing this right cause Ive never posted before. My name is Wendy and Im kinda green at this Mercedes stuff but Ive learned alot from BW & youtube. This last year I replaced & installed pretty much on my own, the wiper motor unit, alternator/volt. reg, break pads, reprogrammed my keyfob. Here's my latest challenge- At stop & upon acceleration car started doggin & making a putting noise. Not so bad once at speed. Hooked a code reader to it & got p0304, p0410, p0300. I checked hoses, lines. Replaced air filter & p0410 went away. Afterward I replaced all 4 spark plugs (not coils), cleaned MAF & throttle body. P0304 & P0300 still there. Bought a fuel filter but kinda want help with that one :-) -- I cant afford to take it in to a shop so Im trying to eliminate the little things first. Not sure what else to do & advice, suggestions or help would be greatly appreciated.
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post #2 of 5 (permalink) Old 03-04-2015, 12:15 PM
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Your P0410 might be a leak in the secondary air injection circuit, even a vacuum leak there or clear over by the purge valve (there's a t in some models that can crack or break). It's possible that leak is triggering the misfires as well. I'd investigate that before going too much further, though swapping the coil packs would be useful and is free. If the misfire moves, then you can suspect a coil pack, if it doesn't you know they are okay.

Are you connected somehow with Travis? Seems like most folks in the Vacaville area are.

Good luck.




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post #3 of 5 (permalink) Old 03-04-2015, 12:31 PM Thread Starter
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Vehicle: 1997 c230 C class w202
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Thanks for the reply. The P0410 went away after I replaced the air filter but the other 2 codes remain. ----Also what do you mean "swapping the coil pads would be useful and FREE??"---- No connection to TAFB other than I live not to far from it. Just a stranded Vacavillian wanting her car fixed ----Any other ideas please let me know. Thanks
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post #4 of 5 (permalink) Old 03-05-2015, 08:31 AM
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Originally Posted by wlbarker View Post
Thanks for the reply. The P0410 went away after I replaced the air filter but the other 2 codes remain. ----Also what do you mean "swapping the coil pads would be useful and FREE??"---- No connection to TAFB other than I live not to far from it. Just a stranded Vacavillian wanting her car fixed ----Any other ideas please let me know. Thanks
Swapping a coil means to move it from one cylinder to another. You only have two, though, so that's kind of a long shot. Personally I'd likely replace the wires and connectors, the latter are kind of a weak link in the secondary on this engine (and a few others of the same generation).

Also you might look/search/post in the forum that is specific to your car (W202). I think it's pretty clear that you don't have a Maybach. And this place is too quiet for a mod to notice and move your thread.

Good luck.




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Last edited by Check Codes; 03-05-2015 at 08:34 AM.
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post #5 of 5 (permalink) Old 03-05-2015, 04:16 PM Thread Starter
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Hi. Hope you get this message.----- So swapped the coils and sure enough when I re-tested it one of them had changed. Previously they read P0304 & P0300 after swapping I got P0302 & P0300. Can I safely say that it's likely a bad coil? Would replacing the 1 coil be sufficient or is it necessary to do both? Also, any suggestions on the best place (for price) to purchase one? Thanks again.
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