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Mercedes-Benz C-Class, Hatchback, Sedan, Wagon
#70 of 886 1997 C230 misfire problems and check engine soon codes
Mar 18, 2004 (1:14 pm)
ok, this is a discussion from another board where my problem is posted as well, I apologize for this, I just did not want to type it all again...
I have a 1997 C230 with 74k miles. It is misfiring on various cylinders according to "car chip" computer reader. This has been going on for about nine months. At first it was once every 3 months, now every week. At first it was only one cylinder, now I am getting random readings. Anyone have any answers, could it be the engine wiring harness(independent service person mentioned this).
--- I replied:
ok, I have the same problem with my c230, and I really hope we can work out this together, according to the information i was able to get at alldata, the cause of this could be an injector, that does not close properly or due to engine wear. I would try getting a new set of injectors my self, but honestly, i do not have the means at the moment, so if You or somebody comes forward with some help, i t will be greatly appreciated
I went back and read what I had written, did not make much sense, so here I go again trying to be more specific.
I have a c230 1997, and have the engine light come on a few times.
According to the scan tool, the computer decided there was a misfire in cylinder one, so I went and did the cheapest fixed, which was to replace cables and sparkplugs. Since the light was still on, I went and unplug the battery for 5 minutes and put it back on.
The problem got fixed for a while, I even went all the way to mexico in it without seeing the light come on again. that is like 1400 miles from where I live. Any way, while down there the light went on and I had the car scanned there, the car had a low gas sensor problem, another problem not related to the misfire, but it did not have the misfire along with it, and that is what counts. I drove another 1400 miles back to the US, and a day later from being at home...Yeap you guessed the light came on, and it was the missfire deal again, I have reset the codes by unpluggin the battery and keeps coming back with the same error.
According to alldata, who provides technical info on all vehicles, this meant that my engine was worn out (from that long trip maybe?.. I do not think so) or I had a bad injector. I have driven my car for a nother 4 months with the light on and I have reset it a few times more with no luck, it comes on a little bit later.
I know is not the engine, because it does not burn oil and works fine. So my next step will be to take the injectors and clean them my self!
Again, if anybody out there had this experience...please advise.
--- Somebody wrote:
I have a 95 C280 which I bought with the engine light on. Hoping it was something simple like a bad oxygen sensor or something, I drove it home from Texas and it was misfiring and it would revv up to about 4000 RPM before shifting. I took it home and changed the plugs and fuel filter and nothing, I took it to my benz mechanic and they hooked it up and got a reading that the fuel mixture was too lean, but they said I needed a new wiring harness, so $1300.00 later the car is doing great, no misfiring,hesitation, rough idle. All cured and for such a modest price too. I paid way too little for this car and I now know why but overall I'm very pleased. This is my third Mercedes and I won't drive anything else.
--- I replied:
Yesterday after work I finally decided to clean the injectors, ( I did not mention before that before going to Mexico I had put some injector cleaning thing in my fuel tank, so that could have helped...), I took 2 screws out , took all 4 injectors out, (this would cause some fuel spill, and of course do this with the battery unplugged, for safety). I noticed there was a little bit of dust built around the bottom o rings, so took them off clean them, and decided to flip it over, since the bottom was kind of burned from contact with the engine. then I connected a small hose to the injector, (thats all i had on site), and filled it up with a mixture of thinner and gasoline, (yeah, yeah, thinner is too strong but i took my chances), after this i applied 12 volts on and off to it while blowing into the hose , after a while you could see a nice stream coming out of the injector, put them back together and then put a little more of this mixture inside the fuel rail before putting the last injector back on . I attached the rail back to the engine, and then try to start it, I knew it would be hard, specially with the rail half empty and the mixture i put in, so i had to crank the engine 6 or 7 times before it kept idle by itself, then once it did, I went back and turn the engine off and unplugged the battery to have the engine light go off. After 5 minutes i plugged it back on and went for a test drive, the car performed great, I mean real smooth, and the engine light that would normally go on within 10 minutes did not, I drove it to work this morning and after a smooth ride the light has not come back on, let's hope that fixes it, but I will keep you guys informed.....
ok, I'm back this time the light took 2 days to come back on!!! good , we are getting there... however the code in the computer shows po170, which is a problem detected on one of the fuel banks, from reading here and there I discovered I could swap ingnition coils and see if the problems changes to another bank, that way all i would have to do would be to buy a new coil, let's hope it works.
---I beg: Please advise!!!...pretty please...
Mar 26, 2004 (10:53 am)
Guess what guys....I did not switched the bobbins but I got it fixed!!!!!!!!!
After going to a few reviews and forums, I noticed that one of the main complaints in some mercedes was the MAF (MASS AIR FLOW SENSOR), so I made the BIG and then not so big mistake of trying to clean it. So I took it apart and put some cleaner in it..... BIG mistake! I actually finished ruining it. The car would stall unless I had my pedal on the gas!!!!. I relized it had to be the "cleaning" I had performed, so after this I drove it I noticed 30% improvement on a transmission issue I had!! why?..the MAF senses the amount of air that goes into the engine to calculate load and how much gas goes into the injectors! but also and most important it tells the computer when to shift!!!, I had bought the car like this and have always considered the car to lack some power (thinking...well, I had a v8 this is only a 4, I guess is ok for a 4 cilynder ). NO WONDER!...the issue was that my transmission would not shift gears soon enough, and I always thought that it was deterioreting little by little. because It was not that bad when I first bought it. Then it was giving me all those p017x errors that were supposed to be related to injectors and gas. that is why I decided that I was to find the problem around the injectors or spark plugs.
Anyway I had to drive with both feet on the pedals for 2 days to overcome my pride and buy the sensor paying overnight shipping too!!
Yeah, I was going to risk 345 dollars to see if the air mass flow sensor was my problem... and guess what!!!! I did not only gained that 30% increase in power, but gained smothness at idle and great performance!!!! The engine light is gone and I'm sure I will not be seeing it anytime soon!!!
BELIEVE ME, that sensor makes the difference between a mercedes and A MERCEDES!!! if You know what I mean...Mercedes rock!!!!
#72 of 886 Xenon Headlights Auto Levelling Issues
Mar 26, 2004 (1:11 pm)
I am having considerable difficulty with my Xenon low-beam headlights. The problem is that the auto-levelling feature aims the lamps too low. The effect of this, on my car, is that the roadway is brighly illuminated 15ft in front of the car, while the pavement beyond that it pitch black. Not only this, but the lights seem to be focused at different levels, with the passenger beam extending out slightly further than the driver side beam. This makes it almost impossible to drive on dark roads.
I have taken my car in three times to fix, and Mercedes runs a computer test and tells me the lights are functioning "normally". The reality is, I can't drive at night.
Has anyone had this problem? What is the solution?
Keywords: xenon headlamps headlights auto levelling HID focus focusing C-320 320 C-Class aimed low problem issue
#73 of 886 Check Engine light
Apr 30, 2004 (5:52 am)
I own a 1997 C280 and recently had the 70K service done from the Mercedes Dealer. I told him about the check engine light turning on and off (having a mind of its own). The dealer told me that the cause of the problem is excessive carbon build up in the engine head. His advice is to remove the head and have it cleaned. Has anybody ever heard of this problem. Its a $1400
fix. Any recommendations.
#74 of 886 Loaner Policy?
Apr 30, 2004 (7:39 am)
Is there a corporate policy on loaners (does warranty say you are entitled to a loaner etc.), or is it up to each dealer do whatever they want?
#75 of 886 Are c230's known to have BAD radio reception?
May 07, 2004 (5:07 am)
I just bought a 2003 c230 from a guy in St. Louis. He told me to "be sure to bring a lot of CD's because we don't have great radio stations around here." Huh? But I was stupid and did just that. Got the car home and I can only get TWO radio stations! Is this considered "normal" for a Mercedes?? If not, is it a simple warranty fix? The closest MB dealer is in Topeka, an hour away.
#76 of 886 Re: Are c230's known to have BAD radio reception? [arcomom #75]
May 07, 2004 (11:00 pm)
So has your reception problem been fixed? I'm having some trouble with reception as well.. a lot of "fuzzy" stations when using the radio and mine is a 2004 c320..
#77 of 886 Key in Ignition
May 09, 2004 (6:21 pm)
Hi People - I'm a new owner of a C-320 sedan. We left the key in the ignition for several days (we live out in the country and usually leave our keys in the car, and don't drive every day) and found that the car wouldn't start. I measured voltage at the battery and found 8.6 VDC. I put the charger on it for a couple of hours and all was back to normal. No loss of memory for seats, radio etc... and started/run fine. Take home lesson.... the key in the ignition (even in the off position) drains the battery.
#78 of 886 Radio reception
May 10, 2004 (8:16 am)
I've owned my C230 sport sedan for over a year and I've never had any problems with reception. Sounds like something unique to your cars.
#79 of 886 Re: Are c230's known to have BAD radio reception? [spicy320 #76]
May 12, 2004 (11:39 am)
I haven't taken my c230 in to complain about the radio reception yet. I'm waiting for a good time to take it to the dealership, which is an hour away. And I wanted to see if this was a known problem or one unique to my "new" car. I'll let you know what they say and whether or not they can fix it.