View Full Version : ahhh!!check engine light!
last night my car misfired for some reason. i turn the key all the way, and the car has a slight jolt and doesnt start. i try it again and it starts up with no problem ... about two hours later while im driving, my check engine light comes on :mad: i noticed when the car is off and i turn the key twice(with all dash lights on) there is a couple clicks and then an electronic buzzing sound coming from somewhere to right of the engine...i hear this with my hood open, but with the hood down, i cant really hear it. is it supposed to be like that or is there something wrong? MAS perhaps? i gotta admit...before the misfire, i was kinda being hard on my car, but i wasnt pushing it that hard..and it was only for about 20 minutes. does anyone have an idea on what it could be? i have a 1999 c230 kompressor... anyone know where i can go to get a free or cheap diagnostic test? the sounds r coming from the circled area...
http://www.imagestation.com/picture/sraid87/p6769c2f09f69cede54f1887aa0ae5ed6/fa95aec9.jpg
someone help me please....
CKlasse
11-11-2003, 01:13 PM
Without trying to be funny, if your engine actually cranks - perhaps you should check the fuel level. The gauge might be wrong.
ken
C280 JR
11-11-2003, 01:50 PM
JUST GO TO AUTOZONE, THEY DO FREE DIAGNOSTICS
ELVIR
i just got back from autozone and the guy said they dont do it anymore and the same for all autozones...
714guy
11-11-2003, 05:27 PM
Originally posted by ryhi
i just got back from autozone and the guy said they dont do it anymore and the same for all autozones...
I know that suck huh, anyways i just bought the scanner from scantool.net for 90 bucks. That like one trip to the shop for CEL.
speedyTe
11-12-2003, 01:35 PM
that sucks. it sounds like a MAS misfire
nooooo!! i hear MAS is $$$ to replace!!! hopefully my extended warranty covers it.....
jnolte
11-12-2003, 07:13 PM
go to www.importec.com (http://www.importec.com) I got my MAS there for my C36 (god bless her soul) for around 240 or 269 shipped i think. Not really bad at all.
thursday night my CEL turned off. but then today after about 20 mins after i filled up with gas, it turned back on!! WTF is going on?? i noticed the first time it turned on i had 3/4 tank, and it turned off when it was about 1/2 tank. does ne1 know whats going on with my car??
Check the sender mechanism (it sends fuel info to the main computer). I've read several posts about this issue.
If there's a good Merc mechanic around go and find out what to fix before it gets much worse! And then maybe your extended warranty would cover it?
Sesh
Rocky
11-17-2003, 10:32 AM
Not to be rude or anything...just being blunt here...
Get the engine codes pulled. No use doing an italian tune up on a merc cause it'll cost you an arm and a leg.
The fault could be MAS, Coil Ends, O2 sensor etc..lotsa possibilities.
Pull the codes and report back and then we can start to diagnose.
tully
11-19-2003, 06:28 PM
Just had my 2000 430 clk in the dealership for the check engine light and what the mechanic told me it is either the Air Mass Sensor or the O2 sensor. What you are describing is the Air Mass Sensor, the dealership price was $290 plus $180 to install.
$180 install?!?! cant u replace the maf sensor in the matter of minutes????
hey tully how much did they charge you to pull codes??
tully
11-21-2003, 07:14 AM
I thought $180 was a bit much, it basically broke down to $90 to pull the codes and $90 to install.
It is a scam to charge $90 to pull the codes because the check engine light can mean only 3 things; Air Mass Flow, O2 sensor, or gas cap not fitting properly.
Rocky
11-24-2003, 09:25 AM
Originally posted by tully
I thought $180 was a bit much, it basically broke down to $90 to pull the codes and $90 to install.
It is a scam to charge $90 to pull the codes because the check engine light can mean only 3 things; Air Mass Flow, O2 sensor, or gas cap not fitting properly.
Nahh..could be more then that...
Had a CEL for :
a warped head
Coil Ends
The CEL will basically come on for emissions sake. Like Fuel rail and stuff.
what does the MAF sensor and the 02 sensor do?? those of u who have had MAF sensor problems, did the diagnostics give u a 02 sensor code too, even tho there was nothing wrong with it?
CKlasse
11-26-2003, 02:07 PM
Originally posted by tully
It is a scam to charge $90 to pull the codes because the check engine light can mean only 3 things; Air Mass Flow, O2 sensor, or gas cap not fitting properly.
It's a scam yes, but CEL can be triggered by much more than those 3 things :)
tully
11-26-2003, 03:10 PM
I wonder if it is different from model to model. I was told by the dealership that on a CLK it is only those 3 things, basically emission control sensors.
CKlasse
11-26-2003, 03:15 PM
All OBD II vehicles have the same codes plus few manufacturers' codes. The three is probably the most common causes, but there are tons of codes that can trigger the CEL. :)
tully
11-27-2003, 08:25 AM
Maybe that is why they charge $90 to tell you what is wrong.;)
Rocky
11-27-2003, 08:37 AM
If you saw the diagnostic book with all the coeds..it'll make your head spin hehehe
Remember, just cause the codes tell you one thin..doesn;t mean that it's the problem.
IE. CEL came on, car goes into LIMP mode. Pull codes. It says soemthing to the tune of misfiring in a bank or soemthing. That's all it said. Turnes out to be a $10 part which is the coil ends. If you didn;t know specifically what's a common problem on the car..the mech would have changed the coil pcks, the wires, the plugs and the ends and would have billed ya hundreds of bucks.
Best thing to do is to do research.
Try www.mercedesshop.com (http://www.mercedesshop.com), they have a very very good tech forum.
714guy
11-27-2003, 01:02 PM
heres a list of DTCs for 96+ MBs.
http://www.whnet.com/4x4/mb-dtc.txt
i was told a bad MAF sensor would give me bad gas mileage....but my car seems to be running as it always has??
Rocky
11-28-2003, 06:39 AM
Originally posted by ryhi
i was told a bad MAF sensor would give me bad gas mileage....but my car seems to be running as it always has??
So will a bad O2 or under inflated tires. I noticed my mileage increase cause I had a 5 year old fuel filter, when I replaced it with a new one, car ran smoother and mileage decreased.
Just get the codes pulled. Do it ASAP cause abad MAS or bad O2 can cause cat coverter to be plugged up and don't even ask how much a new cat is. $3500K CDN for a C36.
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