C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

Need help with check engine light :/

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Old Aug 9, 2010 | 08:06 AM
  #26  
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Yes - if it is a persistent misfire - not 1 in a thousand.
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Old Aug 9, 2010 | 02:59 PM
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05 c230k 6spd
well i just replaced the fuel filterr.. what a pain in the *** with working under the car with low clearance and the location of the filter is akward too.. the car still runs the same and the idle goes up and down a bit.. looks like im going to have to wait for the spark plugs
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Old Aug 10, 2010 | 08:40 PM
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05 c230k 6spd
a little update on this.. i couldnt find the bosch plugs anywhere local so i just ordered em on ebay for a crazy deal came out to like 5 something a plug .. today i took out the old plugs and i couldnt beleive what kind of plugs someone stuck in there.. there was 3 champion plugs and 1 autolite plug that was huge like bigger then the rest of the plugs.. no wonder the car ran like crap.. I bought my car with 55k why would anyone put crap plugs in there at 50k?? SOOO YOU GUYS WHO BOUGHT USED W203 CHECK YOUR SPARK PLUGS U NEVER KNOW!!
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Old Aug 11, 2010 | 08:14 AM
  #29  
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
The things that ******'s do to cars. I'm sure she will enjoy a new set of plugs!
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Old Aug 11, 2010 | 11:55 AM
  #30  
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05 c230k 6spd
I'm with you Gyln, using proper plugs is not much more money and sure gives less problems.. I hate when people cut corners..
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Old Aug 14, 2010 | 11:58 PM
  #31  
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05 c230k 6spd
OK got the plugs today installed all 4 of them.. They are Bosch FR6MPP332 which is the right ones for my car correct? at first the car ran a bit better and idle started being rough again.. I reset the codes and they havent come back in the 15 min driving I did.. But when the car warms up and I drive it a bit spirited for few min and let it idle it idled perfectly and no shaking.. After it cooled of and i restarted it, the idle was rough and keeps going up and down.. so far I replaced the plugs and the fuel filter.. what could it be.. Im calling on monday to see if that hose recall has been done..
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Old Aug 15, 2010 | 08:24 AM
  #32  
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I haven't had much experience with high miles on these cars yet, but have you ever cleaned the throttle body? That's usually a source of a rough idle.
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Old Aug 15, 2010 | 02:23 PM
  #33  
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This sounds similar to Phil's (nlpamg) 05 C230 when it had throttle body problems. You should definitely look into that.
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Old Aug 15, 2010 | 02:26 PM
  #34  
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Originally Posted by 91RS
I haven't had much experience with high miles on these cars yet, but have you ever cleaned the throttle body? That's usually a source of a rough idle.
+1 clean throttle body & MAF while you are about it. On Phil - Our moderator's car they had to replace the throttle body to get rid of rough idle. Sometimes the TB actuator goes haywire & chatters.

Check for all air leaks - e.g. that damn hose.
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Old Aug 15, 2010 | 02:27 PM
  #35  
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Matt & I do it again & post over one another - LOL
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Old Aug 16, 2010 | 12:27 AM
  #36  
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05 c230k 6spd
Thanks Matt and Glyn I read nlpamg's thread and it does seem similar to mine and considering how dirty my engine bay seems it could be those things.. I will clean the trottle body and maf tommrow and also get some techron to add in to the fuel so it can clean up the engine a bit too.. Any other easy fixes to try?
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Old Aug 16, 2010 | 11:24 AM
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05 c230k 6spd
Well i just called the dealer and it seems like there is an open recall on my car for the vent hose.. do you guys think thats what the problem could be?

I also cleaned the throttle body and idle is still weird.. is it ok if i drive the car without the air intake hose attached because that thing is filthy lol?

Last edited by d1no; Aug 16, 2010 at 12:57 PM.
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Old Aug 16, 2010 | 06:01 PM
  #38  
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An unmetered air leak can and will cause a rough idle. I'd take the car in for the recall and get that done for sure.
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Old Aug 17, 2010 | 01:16 AM
  #39  
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05 c230k 6spd
^ I've made an appointment for next week.. Would it hurt my car if I drove it to work with the rough idle.. I mean with the new plugs and fuel filter the car seems to feel better and pulls harder than before and engine is smooth unless its idling on a cold start, there is no check engine light at the moment.
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Old Aug 17, 2010 | 07:27 AM
  #40  
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Fine to drive.
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