misfire code
Thread Starter
Junior Member
Joined: May 2014
Posts: 16
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02 clk 320
misfire code
I have a 02 clk 320 with 150,000 on it.im am getting misfire codes on the 4 and 6 cylinder,I have replaced the coil packs plugs and wires for those two cylinders and its still giving the codes for those cylinders.i am at a total loss,can you guys help me out with this please.
Thread Starter
Junior Member
Joined: May 2014
Posts: 16
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02 clk 320
after I clear the codes,the check engine light comes right back on,.i don't think any other work has been done to it,i just recently got the car on a trade 2 weeks ago,cant get in touch with previous owner,he want return my calls
Newbie
Joined: Jan 2007
Posts: 6
Likes: 0
From: Rio de Janeiro, Brazil
2001 CLK w208 200 Kompressor Avantgarde
as incredible can sound to anyone, i was having random misfire codes, some random hesitation, changed various things (coils, cables, etc..) and nothing solved, but one day at service the didn't have the oil they have been puting in the car, then i changed it to Valvoline Synpower Full Synthetic 5w40 and all my problems went away! the car runs soo smooth, no more codes, you can certanly try this my friend.. What oil have you' been puting in the car?
Senior Member
Joined: Jun 2013
Posts: 287
Likes: 5
From: New Hampshire
Magma Red W208 55 AMG, W203 C230 Kompressor Sedan 6speed M/T, W220 S500
Well your problem seems ignition related but these issues can always seem like one thing and turn out to be something else. So I'll give you a few things to check. Obviously I would suspect you would want to do the cheapest thing first, so.. Check for vacuum leaks around the top of the motor (These old plastic lines are known to break over time and cause misfire codes), pull the plugs on those cylinders and check them. Now the options that could cost money.. MAF sensors are kind of an issue on these vehicles and there are plenty of threads here that can explain how to test/replace. The other thing that could possibly be the problem is a bad catalytic converter, quite possibly one on the same bank as the misfire. Hopefully this helps you out a little.
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Thread Starter
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Joined: May 2014
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02 clk 320
[QUOTE=MagmaRed55;6034032]Well your problem seems ignition related but these issues can always seem like one thing and turn out to be something else. So I'll give you a few things to check. Obviously I would suspect you would want to do the cheapest thing first, so.. Check for vacuum leaks around the top of the motor (These old plastic lines are known to break over time and cause misfire codes), pull the plugs on those cylinders and check them. Now the options that could cost money.. MAF sensors are kind of an issue on these vehicles and there are plenty of threads here that can explain how to test/replace. The other thing that could possibly be the problem is a bad catalytic converter, quite possibly one on the same bank as the misfire. Hopefully this helps you out a little.
ok,have to start somewhere,gonna take the car in today for an oil change
thank you for your time and help.im much grateful.
ok,have to start somewhere,gonna take the car in today for an oil change
thank you for your time and help.im much grateful.
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Newbie
Joined: Jan 2007
Posts: 6
Likes: 0
From: Rio de Janeiro, Brazil
2001 CLK w208 200 Kompressor Avantgarde
put Valvoline Synpower Full Synthetic 5w40 you won't regret.. or Mobil1 0w40 as mercedes recommend. That should be your ONLY options for these beautiful car.
Super Member
Joined: Mar 2005
Posts: 932
Likes: 38
From: North of Boston
It's your MAF...do a search...this has been discussed many times. There is a weakness w/MAF, CPS and seat motors with our cars. Other than that they seem bullet proof. All these misfire codes ultimately come back to a bad MAF...don't try to clean, it's a short fix...don't buy ebay MAF (junk from China..fail in a few months). Get a new one from autohauzaz...careful when installing the air filter cover when done. Insert it securely into the new MAF and gently lower towards front (2 clips hold down).
Thread Starter
Junior Member
Joined: May 2014
Posts: 16
Likes: 0
02 clk 320
It's your MAF...do a search...this has been discussed many times. There is a weakness w/MAF, CPS and seat motors with our cars. Other than that they seem bullet proof. All these misfire codes ultimately come back to a bad MAF...don't try to clean, it's a short fix...don't buy ebay MAF (junk from China..fail in a few months). Get a new one from autohauzaz...careful when installing the air filter cover when done. Insert it securely into the new MAF and gently lower towards front (2 clips hold down).
I ordered a new one today from the dealer......thank you for that info
should have it in a few days!!!!!!!!!!!!!!!!!!
Thread Starter
Junior Member
Joined: May 2014
Posts: 16
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02 clk 320
changed the oil today,it lookedas though the previous owner never changed it,when I removed the old oil filter it just fell apart,it runs a whole lot better but its still throwing the mis fire codes.
Last edited by nolanjr; May 10, 2014 at 12:39 AM. Reason: misspelling
Super Member
Joined: Mar 2005
Posts: 932
Likes: 38
From: North of Boston
Correct the code issue and the engine with smooth out...doubt the oil had anything to do with change in engine.
Thread Starter
Junior Member
Joined: May 2014
Posts: 16
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02 clk 320
[QUOTE=cindyclk;6037916]Have you replaced the MAF yet? Oil has nothing to do with your codes...somehow the original thread title "misfires" is getting confused with what kind of oil you are using.
Correct the code issue and the engine with smooth out...doubt the oil had anything to do with change in engine.[
confused,naaaahhhhh.i KNOW THE OIL HAS NOTHING TO DO WITH THE CODES.just saying I changed the oil.
picked up the MAF this afternoon and I will put it on sometime tomorrow.
Correct the code issue and the engine with smooth out...doubt the oil had anything to do with change in engine.[
confused,naaaahhhhh.i KNOW THE OIL HAS NOTHING TO DO WITH THE CODES.just saying I changed the oil.
picked up the MAF this afternoon and I will put it on sometime tomorrow.
MBWorld Fanatic!
Joined: Nov 2001
Posts: 1,258
Likes: 209
From: Boston North Shore
2001 CLK320 Cabrio
Installing a new MAF installation is an extremely easy DIY (e.g. 5-10 minutes and a screwdriver). If that was the cause of the codes, the CEL will automatically turn off after 3 cold starts.
However, be aware that if you're due for a state inspection, you will fail the OBDII part, because there are are a bunch of sensors that need to change to 'ready' status. They will automatically reset, after driving a couple of hundred miles.
You mentioned that when you changed the oil, the filter fell apart. Had the previous owner used the cheap paper type or the premium fleece type (e.g. only use the better, stronger fleece filter type cartridge your car came with when new)?
However, be aware that if you're due for a state inspection, you will fail the OBDII part, because there are are a bunch of sensors that need to change to 'ready' status. They will automatically reset, after driving a couple of hundred miles.
You mentioned that when you changed the oil, the filter fell apart. Had the previous owner used the cheap paper type or the premium fleece type (e.g. only use the better, stronger fleece filter type cartridge your car came with when new)?
Thread Starter
Junior Member
Joined: May 2014
Posts: 16
Likes: 0
02 clk 320
Installing a new MAF installation is an extremely easy DIY (e.g. 5-10 minutes and a screwdriver). If that was the cause of the codes, the CEL will automatically turn off after 3 cold starts.
However, be aware that if you're due for a state inspection, you will fail the OBDII part, because there are are a bunch of sensors that need to change to 'ready' status. They will automatically reset, after driving a couple of hundred miles.
You mentioned that when you changed the oil, the filter fell apart. Had the previous owner used the cheap paper type or the premium fleece type (e.g. only use the better, stronger fleece filter type cartridge your car came with when new)?
However, be aware that if you're due for a state inspection, you will fail the OBDII part, because there are are a bunch of sensors that need to change to 'ready' status. They will automatically reset, after driving a couple of hundred miles.
You mentioned that when you changed the oil, the filter fell apart. Had the previous owner used the cheap paper type or the premium fleece type (e.g. only use the better, stronger fleece filter type cartridge your car came with when new)?
hello,it was the fleece type filter,i have never seen a filter that bad,i don't think the oil was ever changed,it was very nasty,gonna go out and change the maf in just a few minutes,i will let ya know how it went.
Thread Starter
Junior Member
Joined: May 2014
Posts: 16
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02 clk 320
It's your MAF...do a search...this has been discussed many times. There is a weakness w/MAF, CPS and seat motors with our cars. Other than that they seem bullet proof. All these misfire codes ultimately come back to a bad MAF...don't try to clean, it's a short fix...don't buy ebay MAF (junk from China..fail in a few months). Get a new one from autohauzaz...careful when installing the air filter cover when done. Insert it securely into the new MAF and gently lower towards front (2 clips hold down).
replaced the MAF now im getting 0300 and 0304 codes
MBWorld Fanatic!
Joined: Nov 2001
Posts: 1,258
Likes: 209
From: Boston North Shore
2001 CLK320 Cabrio
Your new P0300 code indicates a Random/Multiple Cylinder Misfire Detected .
If the car is running OK, why not see if after 3 cold restarts, the CEL turns off?
Possibily after changing some coils/wires and MAF, you're still getting error codes because the previous code conditions have not been properly cleared (e.g. still stored). I know the MB STAR Diagnostic System can clear them, some generic hand readers might, or might not.
However, as mentioned above, any of the the dozen or so system sensors, used to detect/sense faults, must change from 'not ready' to 'ready'. If all is now well, after 200+ miles of driving, the 'not ready' sensors will automatically reset to 'ready'.
If not, unfortunately, misfires can be due to many conditions, having to do with proper air/fuel ratio, adaptions.......for example:
* intake leaks
* clogged fuel filter
* spark plugs (e.g. saw that you changed a couple of coils and wires, but didn't see that you changed the plugs)
* faulty oxygen sensor(s)
* faulty fuel injector(s)
* faulty catalytic converter(s)
* stuck/blocked EGR valve / passages
* burned exhaust valve
Hopefully, you can reach the prior owner to find out what maintenance service(s) have been previously done.
If the car is running OK, why not see if after 3 cold restarts, the CEL turns off?
Possibily after changing some coils/wires and MAF, you're still getting error codes because the previous code conditions have not been properly cleared (e.g. still stored). I know the MB STAR Diagnostic System can clear them, some generic hand readers might, or might not.
However, as mentioned above, any of the the dozen or so system sensors, used to detect/sense faults, must change from 'not ready' to 'ready'. If all is now well, after 200+ miles of driving, the 'not ready' sensors will automatically reset to 'ready'.
If not, unfortunately, misfires can be due to many conditions, having to do with proper air/fuel ratio, adaptions.......for example:
* intake leaks
* clogged fuel filter
* spark plugs (e.g. saw that you changed a couple of coils and wires, but didn't see that you changed the plugs)
* faulty oxygen sensor(s)
* faulty fuel injector(s)
* faulty catalytic converter(s)
* stuck/blocked EGR valve / passages
* burned exhaust valve
Hopefully, you can reach the prior owner to find out what maintenance service(s) have been previously done.
Last edited by Serndipity; May 11, 2014 at 05:27 PM.
Thread Starter
Junior Member
Joined: May 2014
Posts: 16
Likes: 0
02 clk 320
Your new P0300 code indicates a Random/Multiple Cylinder Misfire Detected .
If the car is running OK, why not see if after 3 cold restarts, the CEL turns off?
Possibily after changing some coils/wires and MAF, you're still getting error codes because the previous code conditions have not been properly cleared (e.g. still stored). I know the MB STAR Diagnostic System can clear them, some generic hand readers might, or might not.
However, as mentioned above, any of the the dozen or so system sensors, used to detect/sense faults, must change from 'not ready' to 'ready'. If all is now well, after 200+ miles of driving, the 'not ready' sensors will automatically reset to 'ready'.
If not, unfortunately, misfires can be due to many conditions, having to do with proper air/fuel ratio, adaptions.......for example:
* intake leaks
* clogged fuel filter
* spark plugs (e.g. saw that you changed a couple of coils and wires, but didn't see that you changed the plugs)
* faulty oxygen sensor(s)
* faulty fuel injector(s)
* faulty catalytic converter(s)
* stuck/blocked EGR valve / passages
* burned exhaust valve
Hopefully, you can reach the prior owner to find out what maintenance service(s) have been previously done.
If the car is running OK, why not see if after 3 cold restarts, the CEL turns off?
Possibily after changing some coils/wires and MAF, you're still getting error codes because the previous code conditions have not been properly cleared (e.g. still stored). I know the MB STAR Diagnostic System can clear them, some generic hand readers might, or might not.
However, as mentioned above, any of the the dozen or so system sensors, used to detect/sense faults, must change from 'not ready' to 'ready'. If all is now well, after 200+ miles of driving, the 'not ready' sensors will automatically reset to 'ready'.
If not, unfortunately, misfires can be due to many conditions, having to do with proper air/fuel ratio, adaptions.......for example:
* intake leaks
* clogged fuel filter
* spark plugs (e.g. saw that you changed a couple of coils and wires, but didn't see that you changed the plugs)
* faulty oxygen sensor(s)
* faulty fuel injector(s)
* faulty catalytic converter(s)
* stuck/blocked EGR valve / passages
* burned exhaust valve
Hopefully, you can reach the prior owner to find out what maintenance service(s) have been previously done.
is it possible that the new MAF is faulty???????????????
MBWorld Fanatic!
Joined: Nov 2001
Posts: 1,258
Likes: 209
From: Boston North Shore
2001 CLK320 Cabrio
MBWorld Fanatic!
Joined: Oct 2012
Posts: 1,427
Likes: 100
From: Florida
2002 CLK 55 AMG cabriolet Eurocharged
Hey nolan n all,
I see no harm in changing the oil regardless as you now know what the service interval is.
The paper element filter is good for about 5k miles. For those seeking the death penalty for engine and stretching it to 10k miles, a fleece element filter is required it is recommended for synthetic oil anyway.
The misfire is covered good here by strong members, other thoughts would be a compression test. A good cylinder is at least 100 psi. The other test is for fuel injector nozzle firing or leaking air. (several ways to test)
Wiring to cam and crank sensors might give symptoms as well.
All the Best, Gator
I see no harm in changing the oil regardless as you now know what the service interval is.
The paper element filter is good for about 5k miles. For those seeking the death penalty for engine and stretching it to 10k miles, a fleece element filter is required it is recommended for synthetic oil anyway.
The misfire is covered good here by strong members, other thoughts would be a compression test. A good cylinder is at least 100 psi. The other test is for fuel injector nozzle firing or leaking air. (several ways to test)
Wiring to cam and crank sensors might give symptoms as well.
All the Best, Gator
Thread Starter
Junior Member
Joined: May 2014
Posts: 16
Likes: 0
02 clk 320
giving up
Hey nolan n all,
I see no harm in changing the oil regardless as you now know what the service interval is.
The paper element filter is good for about 5k miles. For those seeking the death penalty for engine and stretching it to 10k miles, a fleece element filter is required it is recommended for synthetic oil anyway.
The misfire is covered good here by strong members, other thoughts would be a compression test. A good cylinder is at least 100 psi. The other test is for fuel injector nozzle firing or leaking air. (several ways to test)
Wiring to cam and crank sensors might give symptoms as well.
All the Best, Gator
I see no harm in changing the oil regardless as you now know what the service interval is.
The paper element filter is good for about 5k miles. For those seeking the death penalty for engine and stretching it to 10k miles, a fleece element filter is required it is recommended for synthetic oil anyway.
The misfire is covered good here by strong members, other thoughts would be a compression test. A good cylinder is at least 100 psi. The other test is for fuel injector nozzle firing or leaking air. (several ways to test)
Wiring to cam and crank sensors might give symptoms as well.
All the Best, Gator
Last edited by nolanjr; May 21, 2014 at 02:09 PM. Reason: spelling
