MAF replacement instructions please (Oxygen?)
#1
MAF replacement instructions please (Oxygen?)
Hi,
Can somebody please post detailed instructions on replacing/cleaning the MAF sensor, with some diagrams, if possible? I bought some CRC MAF sensor cleaner, would like to tackle the job tomorrow, but not sure how to even take the cover off! Also, what tools are required? Any help is appreciated.
Thanks in advance.
-esprit ('03 s500 43k miles)
Can somebody please post detailed instructions on replacing/cleaning the MAF sensor, with some diagrams, if possible? I bought some CRC MAF sensor cleaner, would like to tackle the job tomorrow, but not sure how to even take the cover off! Also, what tools are required? Any help is appreciated.
Thanks in advance.
-esprit ('03 s500 43k miles)
#2
done, but issue persists
I managed to eventually find this thread which helped me do the job. Thanks.
The funny thing is that I forgot to plug the MAF back up after cleaning it and the car began hesitating for a moment when I depressed the gas pedal, until I realized what I had done. Shouldn't the CEL have come on with he MAF unplugged?
Anyway, cleaning the MAF (which appeared to be quite clean already) did not take care of the idle issue I have been having; when in park, the car will rock a little every few seconds, seems irregular. When in D (but idle) I think I still feel it, but barely. Engine mounts were replaced by the dealer to no avail. According to the dealer it's all in my head and the car is supposed to do that in park since the engine 'floats' and is not locked down by the transmission. Is this true? Should I be expecting the car to shake irregularly every few seconds? The dealer said there were no error codes or events in memory and raised the idle RPMs a little to help the issue. They showed me the STAR computer screen and a few of the menus all seemed normal, the idle RPMs were clearly fluctuating a little (in the 800-900s), which the tech explained was normal.
The shaking is not strong by any means, but noticeable. Any ideas?
Thanks,
esprit
The funny thing is that I forgot to plug the MAF back up after cleaning it and the car began hesitating for a moment when I depressed the gas pedal, until I realized what I had done. Shouldn't the CEL have come on with he MAF unplugged?
Anyway, cleaning the MAF (which appeared to be quite clean already) did not take care of the idle issue I have been having; when in park, the car will rock a little every few seconds, seems irregular. When in D (but idle) I think I still feel it, but barely. Engine mounts were replaced by the dealer to no avail. According to the dealer it's all in my head and the car is supposed to do that in park since the engine 'floats' and is not locked down by the transmission. Is this true? Should I be expecting the car to shake irregularly every few seconds? The dealer said there were no error codes or events in memory and raised the idle RPMs a little to help the issue. They showed me the STAR computer screen and a few of the menus all seemed normal, the idle RPMs were clearly fluctuating a little (in the 800-900s), which the tech explained was normal.
The shaking is not strong by any means, but noticeable. Any ideas?
Thanks,
esprit
#4
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AMG E55, Stage 1, Strait Pipe from Primary Cats
I managed to eventually find this thread which helped me do the job. Thanks.
The funny thing is that I forgot to plug the MAF back up after cleaning it and the car began hesitating for a moment when I depressed the gas pedal, until I realized what I had done. Shouldn't the CEL have come on with he MAF unplugged?
Anyway, cleaning the MAF (which appeared to be quite clean already) did not take care of the idle issue I have been having; when in park, the car will rock a little every few seconds, seems irregular. When in D (but idle) I think I still feel it, but barely. Engine mounts were replaced by the dealer to no avail. According to the dealer it's all in my head and the car is supposed to do that in park since the engine 'floats' and is not locked down by the transmission. Is this true? Should I be expecting the car to shake irregularly every few seconds? The dealer said there were no error codes or events in memory and raised the idle RPMs a little to help the issue. They showed me the STAR computer screen and a few of the menus all seemed normal, the idle RPMs were clearly fluctuating a little (in the 800-900s), which the tech explained was normal.
The shaking is not strong by any means, but noticeable. Any ideas?
Thanks,
esprit
The funny thing is that I forgot to plug the MAF back up after cleaning it and the car began hesitating for a moment when I depressed the gas pedal, until I realized what I had done. Shouldn't the CEL have come on with he MAF unplugged?
Anyway, cleaning the MAF (which appeared to be quite clean already) did not take care of the idle issue I have been having; when in park, the car will rock a little every few seconds, seems irregular. When in D (but idle) I think I still feel it, but barely. Engine mounts were replaced by the dealer to no avail. According to the dealer it's all in my head and the car is supposed to do that in park since the engine 'floats' and is not locked down by the transmission. Is this true? Should I be expecting the car to shake irregularly every few seconds? The dealer said there were no error codes or events in memory and raised the idle RPMs a little to help the issue. They showed me the STAR computer screen and a few of the menus all seemed normal, the idle RPMs were clearly fluctuating a little (in the 800-900s), which the tech explained was normal.
The shaking is not strong by any means, but noticeable. Any ideas?
Thanks,
esprit
#5
#6
43k miles. I have an appointment for an oil change at the dealership today, I am thinking about asking them to change the spark plugs as well. I plan on driving the car for at least 50k more miles, so I figure that's an expense I will have to incur anyway. BTW, is this a job that most independent shops should be able to tackle as well?
The vibration is driving me nuts! This is how I bought the car (didn't know it at the time) and it has been 2k miles since. It doesn't seem to be getting worse, at least not quickly enough for me to notice.
Regards,
esprit
#7
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AMG E55, Stage 1, Strait Pipe from Primary Cats
43k miles. I have an appointment for an oil change at the dealership today, I am thinking about asking them to change the spark plugs as well. I plan on driving the car for at least 50k more miles, so I figure that's an expense I will have to incur anyway. BTW, is this a job that most independent shops should be able to tackle as well?
The vibration is driving me nuts! This is how I bought the car (didn't know it at the time) and it has been 2k miles since. It doesn't seem to be getting worse, at least not quickly enough for me to notice.
Regards,
esprit
The vibration is driving me nuts! This is how I bought the car (didn't know it at the time) and it has been 2k miles since. It doesn't seem to be getting worse, at least not quickly enough for me to notice.
Regards,
esprit
ps.Where are you located ?
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#8
I just got back from Lokey Mercedes. Got the oil changed ($79.95) and managed to get two of the techs to get inside the car and feel the vibration. They got inside and brainstormed. Asked me what type of gas I was putting in, if engine mounts had been replaced, if I had used any fuel system cleaners, which I had. I heard words like 'injectors', 'carbon build-up', EKG (or something similar...), 'pressure pump'.
They want to start with the engine treatment since it seems that the valves are not working evenly ($150). They did not believe that this was caused by the spark plugs. According to the service coordinator, it's not a good idea for them to take too long to try to diagnose the issue, because my aftermarket warranty (Mercury Insurance) may not pay for a lengthy diagnosis.
I will go there at 9am tomorrow and then post the results here.
Regards,
esprit
'03 S500, 43k miles
#9
Did the injector system cleaning today. Spent $150 but don't see a difference, car still shakes at itle. I will go ahead and try to replace the spark plugs and cables myself, following the instructions posted in these excellent threads:
https://mbworld.org/forums/c36-amg-c43-amg-w202/142196-changing-c43-sparkplugs.html
https://mbworld.org/forums/showthrea...ighlight=spark
Would a faulty EGR valve cause shaking at idle?
Thanks,
esprit
https://mbworld.org/forums/c36-amg-c43-amg-w202/142196-changing-c43-sparkplugs.html
https://mbworld.org/forums/showthrea...ighlight=spark
Would a faulty EGR valve cause shaking at idle?
Thanks,
esprit
#10
I may have a same problem. The car has been doing the same thing as your car since 30~40k miles. As I am getting my car back on today, I will try replacing the MAF on the car since I have the parts. (currently 60k mi)
IMO, the "rocking" symptoms could be caused by the following:
1. Engine Mount (small chance of cause because you already have replaced it)
2. Transmission Mount - I had to replace one on my S350 (in Asia) for the same symptom, and the vibration on the car disappeared. THe most likely parts that have to be replaced!! This would be the best try.
3. Injectors - Irregular fuel injection could result in a unstable idle.
4. Spark Plugs- Non-consistent spark strength / etc.
Hope this could help you. I might replace the engine mounts when I do the transmission fluid change.
IMO, the "rocking" symptoms could be caused by the following:
1. Engine Mount (small chance of cause because you already have replaced it)
2. Transmission Mount - I had to replace one on my S350 (in Asia) for the same symptom, and the vibration on the car disappeared. THe most likely parts that have to be replaced!! This would be the best try.
3. Injectors - Irregular fuel injection could result in a unstable idle.
4. Spark Plugs- Non-consistent spark strength / etc.
Hope this could help you. I might replace the engine mounts when I do the transmission fluid change.
#12
Thanks for the reply. The unstable idle I am experiencing is most pronounced when the car is in park. With that in mind, is it probable that it is caused by bad transmission mounts? Isn't the transmission disengaged while in park? Also, in a very quiet environment I can hear the sound of the engine change slightly when it shakes. At night, I can also see a very subtle change in the intensity of the dome lights. I connected a volt meter to the cigarette lighter plug, but the fluctuation is very slight, less than when a window is being closed for example.
Thanks,
esprit
Thanks,
esprit
I may have a same problem. The car has been doing the same thing as your car since 30~40k miles. As I am getting my car back on today, I will try replacing the MAF on the car since I have the parts. (currently 60k mi)
IMO, the "rocking" symptoms could be caused by the following:
1. Engine Mount (small chance of cause because you already have replaced it)
2. Transmission Mount - I had to replace one on my S350 (in Asia) for the same symptom, and the vibration on the car disappeared. THe most likely parts that have to be replaced!! This would be the best try.
3. Injectors - Irregular fuel injection could result in a unstable idle.
4. Spark Plugs- Non-consistent spark strength / etc.
Hope this could help you. I might replace the engine mounts when I do the transmission fluid change.
IMO, the "rocking" symptoms could be caused by the following:
1. Engine Mount (small chance of cause because you already have replaced it)
2. Transmission Mount - I had to replace one on my S350 (in Asia) for the same symptom, and the vibration on the car disappeared. THe most likely parts that have to be replaced!! This would be the best try.
3. Injectors - Irregular fuel injection could result in a unstable idle.
4. Spark Plugs- Non-consistent spark strength / etc.
Hope this could help you. I might replace the engine mounts when I do the transmission fluid change.
#13
Yeah, that is what I have thought. The transmission is disengaged in a "park" position. Espirit, try putting the car into reverse and see if you still get that "rock". This method was used for determining transmssion mount failure on the S350 I have in Asia.(told to do so my the mechanic)
#14
No, no rocking while in reverse. It seems that the "rocking" is coming from the engine. In a quiet environment I can hear the sound of the engine change a little, as if the RPMs are dropping (the tachometer does not change). The rocking is most expressed while the car is in Park. It is by no means hard, I have to turn the music off (so there is no base) to feel it properly. But once you do notice it, it's pretty clear and defined. In drive or reverse, when the engine is "held down" by the transmission, it is practically unnoticeable, I only notice it because I look for it.
44k miles now, no codes, MAF has been cleaned, injection system has been cleaned, engine mounts replaced.
Any suggestions as to the next step are appreciated.
Thanks,
esprit
44k miles now, no codes, MAF has been cleaned, injection system has been cleaned, engine mounts replaced.
Any suggestions as to the next step are appreciated.
Thanks,
esprit
Yeah, that is what I have thought. The transmission is disengaged in a "park" position. Espirit, try putting the car into reverse and see if you still get that "rock". This method was used for determining transmssion mount failure on the S350 I have in Asia.(told to do so my the mechanic)
#15
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Mercedes S500 Sport
Hey Esprit,
I've been noticing the same on my 01 S500. I don't think it's the engine mount because I open the hood and put my hand on the engine and can feel the vibration or rather the engine sputtering every couple of seconds. In the cabin, it's definitely felt and I sat in my mother-in-law's S430 and notice that it was vibration free. This definitely bothers me and I have been searching the forums for the last 30 min to see what people have said. Seems like you have tried everything. Have you changed spark plugs yet? I've been having this problem for the last 2 years but now I want to find a solution. Let me know what you find. Thanks.
Phil
I've been noticing the same on my 01 S500. I don't think it's the engine mount because I open the hood and put my hand on the engine and can feel the vibration or rather the engine sputtering every couple of seconds. In the cabin, it's definitely felt and I sat in my mother-in-law's S430 and notice that it was vibration free. This definitely bothers me and I have been searching the forums for the last 30 min to see what people have said. Seems like you have tried everything. Have you changed spark plugs yet? I've been having this problem for the last 2 years but now I want to find a solution. Let me know what you find. Thanks.
Phil
#17
Yes your issue seems to be the same.
Have not changed the spark plugs yet. I am taking her to the dealership on Thursday to get the transmission mounts replaced. Deep inside, I am pretty sure that won't take care of it.
Spark plugs and cables are next.
If anyone else has experienced this, please help. I wish I could change the name of this thread.
Thanks,
esprit
Have not changed the spark plugs yet. I am taking her to the dealership on Thursday to get the transmission mounts replaced. Deep inside, I am pretty sure that won't take care of it.
Spark plugs and cables are next.
If anyone else has experienced this, please help. I wish I could change the name of this thread.
Thanks,
esprit
Hey Esprit,
I've been noticing the same on my 01 S500. I don't think it's the engine mount because I open the hood and put my hand on the engine and can feel the vibration or rather the engine sputtering every couple of seconds. In the cabin, it's definitely felt and I sat in my mother-in-law's S430 and notice that it was vibration free. This definitely bothers me and I have been searching the forums for the last 30 min to see what people have said. Seems like you have tried everything. Have you changed spark plugs yet? I've been having this problem for the last 2 years but now I want to find a solution. Let me know what you find. Thanks.
Phil
I've been noticing the same on my 01 S500. I don't think it's the engine mount because I open the hood and put my hand on the engine and can feel the vibration or rather the engine sputtering every couple of seconds. In the cabin, it's definitely felt and I sat in my mother-in-law's S430 and notice that it was vibration free. This definitely bothers me and I have been searching the forums for the last 30 min to see what people have said. Seems like you have tried everything. Have you changed spark plugs yet? I've been having this problem for the last 2 years but now I want to find a solution. Let me know what you find. Thanks.
Phil
#18
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W220 S65 AMG
No, no rocking while in reverse. It seems that the "rocking" is coming from the engine. In a quiet environment I can hear the sound of the engine change a little, as if the RPMs are dropping (the tachometer does not change). The rocking is most expressed while the car is in Park. It is by no means hard, I have to turn the music off (so there is no base) to feel it properly. But once you do notice it, it's pretty clear and defined. In drive or reverse, when the engine is "held down" by the transmission, it is practically unnoticeable, I only notice it because I look for it.
44k miles now, no codes, MAF has been cleaned, injection system has been cleaned, engine mounts replaced.
Any suggestions as to the next step are appreciated.
Thanks,
esprit
44k miles now, no codes, MAF has been cleaned, injection system has been cleaned, engine mounts replaced.
Any suggestions as to the next step are appreciated.
Thanks,
esprit
#21
Senior Member
Replace O2 sensors when you REPLACE the MAF
I don't recall if you said you cleaned the MAF because of this shudder problem? But if cleaning the MAF seems to have caused this problem....
Swapping in new O2 sensors with new MAF has been recommended in a few forums, though I don't remember reading that for this vehicle specifically. I know you only "cleaned" the MAF, but it might be worth trying, before you start monkeying around with the Tranny mount.
The ECU monitors more than just the incoming airflow (MAF) to create the ignition profile. It also checks emissions via the O2 sensors in the exhaust path. It has been programmed to look for a relationship between a change in the O2 range when the MAF range changes.
Swapping in new O2 sensors with new MAF has been recommended in a few forums, though I don't remember reading that for this vehicle specifically. I know you only "cleaned" the MAF, but it might be worth trying, before you start monkeying around with the Tranny mount.
The ECU monitors more than just the incoming airflow (MAF) to create the ignition profile. It also checks emissions via the O2 sensors in the exhaust path. It has been programmed to look for a relationship between a change in the O2 range when the MAF range changes.
#22
#23
I cleaned the MAF in an attempt to try to eliminate the problem, but it did not help.
I am thinking spark plugs and cables next ... or should I replace the O2 sensors first?
(Is it possible to change the name of this thread. It seems I am not the only one experiencing this issue )
Thanks,
esprit
I am thinking spark plugs and cables next ... or should I replace the O2 sensors first?
(Is it possible to change the name of this thread. It seems I am not the only one experiencing this issue )
Thanks,
esprit
I don't recall if you said you cleaned the MAF because of this shudder problem? But if cleaning the MAF seems to have caused this problem....
Swapping in new O2 sensors with new MAF has been recommended in a few forums, though I don't remember reading that for this vehicle specifically. I know you only "cleaned" the MAF, but it might be worth trying, before you start monkeying around with the Tranny mount.
The ECU monitors more than just the incoming airflow (MAF) to create the ignition profile. It also checks emissions via the O2 sensors in the exhaust path. It has been programmed to look for a relationship between a change in the O2 range when the MAF range changes.
Swapping in new O2 sensors with new MAF has been recommended in a few forums, though I don't remember reading that for this vehicle specifically. I know you only "cleaned" the MAF, but it might be worth trying, before you start monkeying around with the Tranny mount.
The ECU monitors more than just the incoming airflow (MAF) to create the ignition profile. It also checks emissions via the O2 sensors in the exhaust path. It has been programmed to look for a relationship between a change in the O2 range when the MAF range changes.
#24
i've got similar issues with my 01 c320. rocking/shaking during idle. engine mounts are fine. plan on replacing the spark plugs/wires next week. others have replaced the transmission oil and also updated/flashed the computer software. keep us posted. good luck!
#25
After replacing the MAF with a new one from Bosch, the symptom was still there. The.. hellish "engine check light" came on AGAIN !
I finally bought the code reader, and the results were..
BOTH PRE-CAT O2 sensor.. SHOT!
Data:
P0130 & P0150
P0130 - O2 circuit Bank 1 Sensor 1
P0150 - O2 circuit Bank 2 sensor 1
Fuel sys1 & 2 Open loop drive
Calculated load: 10.1%
Engine coolant temp: 168F
STFT (right spelling?) Bank 1 - 0.0% Bank 2: 0.0%
LTFT Bank1 - 14.8%, Bank 2 - -14.0%
Intake manifold pressure: -5.6 in.hg
OH.. I got tons of things to do on my car.. Transmssion fluid change, eletrical seal change on the transmission, and the O2 sensor..
Stupid stealerships could not figure out these problems. I just hate them..
hope O2 sensor would cure out everything!
p.s - thanks for the reply, Espirit.
I finally bought the code reader, and the results were..
BOTH PRE-CAT O2 sensor.. SHOT!
Data:
P0130 & P0150
P0130 - O2 circuit Bank 1 Sensor 1
P0150 - O2 circuit Bank 2 sensor 1
Fuel sys1 & 2 Open loop drive
Calculated load: 10.1%
Engine coolant temp: 168F
STFT (right spelling?) Bank 1 - 0.0% Bank 2: 0.0%
LTFT Bank1 - 14.8%, Bank 2 - -14.0%
Intake manifold pressure: -5.6 in.hg
OH.. I got tons of things to do on my car.. Transmssion fluid change, eletrical seal change on the transmission, and the O2 sensor..
Stupid stealerships could not figure out these problems. I just hate them..
hope O2 sensor would cure out everything!
p.s - thanks for the reply, Espirit.