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#1 (permalink) Old 03-23-2009, 03:03 AM
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Exclamation HELP DIY TUNE-UP C230

Hey guys, been looking around for DIY's specifically for the c230 sedan for replacing SparkPlugs, SparkPlug Wires, O2 Sensors(how many and where), Ignition Rotor and Distributor Cap. Im doing a tune-up on my car to avoid future problems. i already replaced the fuel filter and did a tranny flush. i think all those are the things need to be replaced at tune-up. please post DIY's and please Part number's for OEM parts or HIGH PERFORMANCE PARTS(high-tension wires,iridium plugs or platinum? etc.). thanks! and also if there are other important things you think i have to replace please advice. Thanks again!

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#2 (permalink) Old 03-23-2009, 08:35 AM
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These cars do not have a distributor, so they do not have a distributor cap, rotor or wires. You should not need to replace the O2 sensors unless you are failing emissions tests or seeing poor performance or codes. The spark plugs have an 80k change interval as they are iridium, and replacing them involves removal of the top engine cover and coil packs, very straightforward. You will need some reverse Torx bits as well as a spark plug wrench. The coils are not a regular replacement part and should only be replaced if you are getting misfire codes.

All this is assuming a Kompressor C230, since you didn't tell us what year you have.
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#3 (permalink) Old 03-24-2009, 02:43 PM
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Originally Posted by zeet View Post
These cars do not have a distributor, so they do not have a distributor cap, rotor or wires. You should not need to replace the O2 sensors unless you are failing emissions tests or seeing poor performance or codes. The spark plugs have an 80k change interval as they are iridium, and replacing them involves removal of the top engine cover and coil packs, very straightforward. You will need some reverse Torx bits as well as a spark plug wrench. The coils are not a regular replacement part and should only be replaced if you are getting misfire codes.

All this is assuming a Kompressor C230, since you didn't tell us what year you have.
zeet, would a failed o2 sensor cause what seems to be lag or less power after pressing the gas pedal? i am getting a misfire in cyl #3 code (as well as thermostat and o2 sensor bank 1 sensor 2) but i think it's being caused by the bad o2 downstream sensor...thoughts?

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#4 (permalink) Old 03-24-2009, 04:20 PM
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Downstream sensor should just be to monitor the efficiency and efficacy of the catalyst. It shouldn't have any input on the running of the engine. That is based on my experience with other Bosch systems, but should also be true on MB. Have you tried unplugging the MAF? MAF failure is common on most modern cars and will result in poor performance, poor mileage and poor emissions. If you unplug it you will set a code and CEL but you should get baseline 'okay' performance that will let you know if it has a problem. Also, the O2 sensor is completely ignored at WOT so if you push the pedal all the way down to the kickdown and still get lag you do not have an O2 problem.
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#5 (permalink) Old 03-25-2009, 09:24 AM
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Downstream sensor should just be to monitor the efficiency and efficacy of the catalyst. It shouldn't have any input on the running of the engine. That is based on my experience with other Bosch systems, but should also be true on MB. Have you tried unplugging the MAF? MAF failure is common on most modern cars and will result in poor performance, poor mileage and poor emissions. If you unplug it you will set a code and CEL but you should get baseline 'okay' performance that will let you know if it has a problem. Also, the O2 sensor is completely ignored at WOT so if you push the pedal all the way down to the kickdown and still get lag you do not have an O2 problem.
i am going to unplug the maf for the ride home and see if the response to the gas pedal improves, then i'll know right away if it's the maf or not...i bought the crc maf cleaner but i didnt have the proper tool to do the job so i have to wait...i remember replacing the coil for cyl #3 and i had the same performance so i returned the part and used the old one...must be the maf becuase i have a total of 3 codes, p0128, p0353, and p0140... thermostat, cyl #3 coil, and o2 sensor (has nothing to do with performance) ... UPDATE -- do you think an improperly installed fuel pump could cause that problem? possibly related to line pressure and flow? thanks

Last edited by DnBtekhnic; 03-25-2009 at 09:32 AM. Reason: quick thought...
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#6 (permalink) Old 03-25-2009, 09:36 AM
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No idea on the fuel pump, but the thermostat code could be real and can cause poor running. If you replace the thermostat do the sensor at the same time; there was a thread about it just a couple days ago here.
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#7 (permalink) Old 03-25-2009, 11:14 PM
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thanks for your reply zeet. my mileage is 74k just wanted to avoid any future problems that can be avoided. if anyone knows any of these things i could replace to avoid problems let me know. thanks! oh has anybody replaced OEM shocks because of wear and tear. im getting a vibration at 65 mph to 70-80mph. had my car aligned and balanced and everything was A O K. was perfectly balanced and aligned. might be a bad tire? please advice.
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#8 (permalink) Old 03-26-2009, 12:25 AM
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If it's a bad tire, rotating the tires front to back will help figure that out. If it goes away from the steering wheel, or comes into the steering wheel, then you have narrowed it down. You can also have a place that does 'road force' balancing examine it but that will cost a bit.

Note: if you have staggered rims only road force balancing or replacement will find a bad tire.
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#9 (permalink) Old 03-26-2009, 08:31 AM
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just a quick update, unplugging the MAF and driving home had ZERO affect on the car, the throttle was still unresponsive after a certain point...
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#10 (permalink) Old 03-26-2009, 09:31 AM
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Have you fixed the cause of the thermostat error yet? Running with the engine at the wrong temperature or reporting the wrong temperature to the computer will cause poor performance.
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