Check engine light.....misfires, thoughts?........
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2003 C32
Check engine light.....misfires, thoughts?........
On the highway with the cruise set at 65, hot day 91 degrees. Felt a slight "stumble" and CE light comes on, flashes 3-4 times. Stop and pull codes:
P0300 Random/Multiple Cylinder Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0302 Cylinder 2 Misfire Detected
P0303 Cylinder 3 Misfire Detected
I can't imagine that many coils had an issue at once. Was not in the boost at all either.
What do you guys think? Maybe CPS? Car is stock right now except for intake (2003 C32) and has 54K miles. Has been running great with no issues for almost 2 years now.
Calling my mechanic but would love to hear your thoughts. Thanks
P0300 Random/Multiple Cylinder Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0302 Cylinder 2 Misfire Detected
P0303 Cylinder 3 Misfire Detected
I can't imagine that many coils had an issue at once. Was not in the boost at all either.
What do you guys think? Maybe CPS? Car is stock right now except for intake (2003 C32) and has 54K miles. Has been running great with no issues for almost 2 years now.
Calling my mechanic but would love to hear your thoughts. Thanks
Last edited by Dasauto; May 30, 2013 at 01:33 PM.
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Joined: Mar 2007
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From: Houston, TX
C32/C55 AMG
Have you moved anything in the engine bay recently? I had a similar issue, but I forgot to reconnect a coil pack when I took them off.
A CPS usually will shut down the car and not allow it to start until it's cooled down a bit. Most of the time you will get a CEL for the CPS, but that's not always the case. Replacing the CPS would be cheap insurance, but it's better to pinpoint the problem before throwing money at repairs.
Are you able to clear CEL and does it come back when you drive it? Are you experiencing poor idle or an odd engine shake? Does the issue happen on hard acceleration or during normal driving?
It could be wires, plugs, coil packs, clogged cats, faulty 02 sensors, or extremely dirty air filters.
The weird thing is that the misfires all occurred on the same side of the engine. Maybe there's a break at the wires that connect to the coil packs.
A CPS usually will shut down the car and not allow it to start until it's cooled down a bit. Most of the time you will get a CEL for the CPS, but that's not always the case. Replacing the CPS would be cheap insurance, but it's better to pinpoint the problem before throwing money at repairs.
Are you able to clear CEL and does it come back when you drive it? Are you experiencing poor idle or an odd engine shake? Does the issue happen on hard acceleration or during normal driving?
It could be wires, plugs, coil packs, clogged cats, faulty 02 sensors, or extremely dirty air filters.
The weird thing is that the misfires all occurred on the same side of the engine. Maybe there's a break at the wires that connect to the coil packs.
Last edited by loudandheard; May 30, 2013 at 03:14 PM.
Thread Starter
Member
Joined: Jun 2011
Posts: 189
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2003 C32
Have you moved anything in the engine bay recently? I had a similar issue, but I forgot to reconnect a coil pack when I took them off.
A CPS usually will shut down the car and not allow it to start until it's cooled down a bit. Most of the time you will get a CEL for the CPS, but that's not always the case.
Are you able to clear CEL and does it come back when you drive it? Are you experiencing poor idle or an odd engine shake? Does the issue happen on hard acceleration or during normal driving?
It could be wires, plugs, coil packs, clogged cats, faulty 02 sensors, or extremely dirty air filters.
The weird thing is that the misfires all occurred on the same side of the engine. Maybe there's a break at the wires that connect to the coil packs.
A CPS usually will shut down the car and not allow it to start until it's cooled down a bit. Most of the time you will get a CEL for the CPS, but that's not always the case.
Are you able to clear CEL and does it come back when you drive it? Are you experiencing poor idle or an odd engine shake? Does the issue happen on hard acceleration or during normal driving?
It could be wires, plugs, coil packs, clogged cats, faulty 02 sensors, or extremely dirty air filters.
The weird thing is that the misfires all occurred on the same side of the engine. Maybe there's a break at the wires that connect to the coil packs.
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2003 C32
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2003 C32
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2003 C32
Update.........mechanic can't look at until early next week. Took it for a little drive yesterday and it seemed fine, then felt the stumble again and sure enough it threw the same codes but with one more this time:
P0134 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
So my question is, wonder if the 1-3 cylinder misfire caused this or did the 02 sensor cause the misfire? Egg before the chicken, chicken before the egg?
P0134 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
So my question is, wonder if the 1-3 cylinder misfire caused this or did the 02 sensor cause the misfire? Egg before the chicken, chicken before the egg?
MBWorld Fanatic!
Joined: Mar 2004
Posts: 2,073
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From: North NJ
2002 C32 AMG, 2013 GLK 350/4, 2015 E63S AMG Wagon
Update.........mechanic can't look at until early next week. Took it for a little drive yesterday and it seemed fine, then felt the stumble again and sure enough it threw the same codes but with one more this time:
P0134 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
So my question is, wonder if the 1-3 cylinder misfire caused this or did the 02 sensor cause the misfire? Egg before the chicken, chicken before the egg?
P0134 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
So my question is, wonder if the 1-3 cylinder misfire caused this or did the 02 sensor cause the misfire? Egg before the chicken, chicken before the egg?
