2005 ML350 problems need help
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2005 ML350 problems need help
2005 ML-350
Hello I have a car here that started having these problems all at the same time. I thought it was a vacuum leak at first because when I inspected it it just had an O2 code and a rough idle. Upon inspection I could not find any vacuum leaks. I'm not sure what is wrong and I think there's probably a single problem causing all these issues.
symptoms:
rough idle
Misfires
Idle will sometimes run away to 4k rpm
Stalls occasionally when stopped in drive
codes
P104- mass air flow a circuit intermittent
cyl 1 misfire
Cyl 2 misfire
Cyl 3 misfire
Random multiple misfire
O2 sensor code
I dont have all of the actual codes since I cleared them before posting this. I'm not a Mercedes tech and i think that a MBZ tech would have a better idea of what's wrong.
Thanks,
-John.
Hello I have a car here that started having these problems all at the same time. I thought it was a vacuum leak at first because when I inspected it it just had an O2 code and a rough idle. Upon inspection I could not find any vacuum leaks. I'm not sure what is wrong and I think there's probably a single problem causing all these issues.
symptoms:
rough idle
Misfires
Idle will sometimes run away to 4k rpm
Stalls occasionally when stopped in drive
codes
P104- mass air flow a circuit intermittent
cyl 1 misfire
Cyl 2 misfire
Cyl 3 misfire
Random multiple misfire
O2 sensor code
I dont have all of the actual codes since I cleared them before posting this. I'm not a Mercedes tech and i think that a MBZ tech would have a better idea of what's wrong.
Thanks,
-John.
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Anyway, that would make sense since the O2 code is sensor 2. But I wouldn't expect a MAF code, would you?
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From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
Yes it would cause a problem with the MAF because of loss of eng. load. Read #6 in PDF
You will have to buy an Exhaust Back Pressure Gauge. Remove the right front O2 sensor, install the gauge fitting in its place. Start the eng. and look at gauge. Any reading over ZERO means your CAT is clogged or damaged.
Then increase the RPMs and you will see the gauge climbs higher.
You will have to buy an Exhaust Back Pressure Gauge. Remove the right front O2 sensor, install the gauge fitting in its place. Start the eng. and look at gauge. Any reading over ZERO means your CAT is clogged or damaged.
Then increase the RPMs and you will see the gauge climbs higher.
Last edited by Maj. Dundee; Jan 27, 2020 at 03:10 AM. Reason: mistake
Thread Starter
Newbie
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Yes it would cause a problem with the MAF because of loss of eng. load. Read #6 in PDF
You will have to buy an Exhaust Back Pressure Gauge. Remove the right front O2 sensor, install the gauge fitting in its place. Start the eng. and look at gauge. Any reading over ZERO means your CAT is clogged or damaged.
Then increase the RPMs and you will see the gauge climbs higher.
https://www.amazon.com/s?k=exhaust+b...b_sb_ss_i_1_21
You will have to buy an Exhaust Back Pressure Gauge. Remove the right front O2 sensor, install the gauge fitting in its place. Start the eng. and look at gauge. Any reading over ZERO means your CAT is clogged or damaged.
Then increase the RPMs and you will see the gauge climbs higher.
https://www.amazon.com/s?k=exhaust+b...b_sb_ss_i_1_21
