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C43 cylinder #2 & #4 misfire suspect bad coils
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05 Hammer
C43 cylinder #2 & #4 misfire suspect bad coils
Been having an issue with misfires on cylinders 2 & 4 but only when I go over 3500rpm or 1/2 throttle. Suspect it's the coil packs going bad along with spark plugs. CEL comes on and goes into limp mode with more than half throttle. Cant burn fuel so ECU shuts both cylinders and could down. Thoughts? I was quoted $350 to do plugs and coils in just those 2 cylinders. DIY?
Last edited by MProved; Sep 16, 2015 at 04:05 PM.
Senior Member
Joined: Aug 2007
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From: Los Angeles, CA
w202
if the $350 includes brand new OEM parts, then it's not extremely bad; quote is for sure on the high side, but one Bosch coil is around $80 + shipping and OEM Bosch spark plugs are around $5 /each...
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From: Sydney, Australia
190D 2.5 (x2), 190E 2.6, W202 C240,W202 C43 (C55), W210 E55, W212 E250CDI
The coils very rarely fail and if they do they usually misfire all the time.
Misfire at upper rpm/load ranges is usually due to a lean misfire caused by the MAF sensor failing. Disconnect the electrical plug on the MAF and see if it still misfires. If not then replace the MAF and reset the fuel trims with a diagnostic tool or disconnect the battery for 5 mins.
Misfire at upper rpm/load ranges is usually due to a lean misfire caused by the MAF sensor failing. Disconnect the electrical plug on the MAF and see if it still misfires. If not then replace the MAF and reset the fuel trims with a diagnostic tool or disconnect the battery for 5 mins.
Thread Starter
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Joined: Jan 2011
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05 Hammer
The coils very rarely fail and if they do they usually misfire all the time.
Misfire at upper rpm/load ranges is usually due to a lean misfire caused by the MAF sensor failing. Disconnect the electrical plug on the MAF and see if it still misfires. If not then replace the MAF and reset the fuel trims with a diagnostic tool or disconnect the battery for 5 mins.
Misfire at upper rpm/load ranges is usually due to a lean misfire caused by the MAF sensor failing. Disconnect the electrical plug on the MAF and see if it still misfires. If not then replace the MAF and reset the fuel trims with a diagnostic tool or disconnect the battery for 5 mins.
Last edited by MProved; Sep 18, 2015 at 01:48 PM.
Super Member
Joined: Nov 2011
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From: San Diego
2004 E55
C43 cylinder #2 & #4 misfire suspect bad coils
Mine did the same thing. Showed misfire codes, but nothing actually indicating it was a MAF issue. Replaced MAF & it hasn't been back; no codes & it's been about 5 months.
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are these cheap parts where you live?
do you buy Bosch or genuine MB parts or maybe something else?
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MBWorld Fanatic!
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From: A.D., U.A.E
2000 (W202 C200) & 2000 (W202 C55)
How you want me to show you..[!?!],,
come here to the shop near me, and take whatever quantity you wish, ($108) for a piece, and ($102) if you take more than (5) pieces..!!!
ZAYED,,
come here to the shop near me, and take whatever quantity you wish, ($108) for a piece, and ($102) if you take more than (5) pieces..!!!
ZAYED,,
Thread Starter
Senior Member
Joined: Jan 2011
Posts: 391
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05 Hammer
MBWorld Fanatic!
Joined: Aug 2006
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From: A.D., U.A.E
2000 (W202 C200) & 2000 (W202 C55)
Sure i can, shipping will be ($68), ($108+$68= $176)..!
you can get one locally cheaper, around ($150), from E-bay or Amazon:-
http://www.ebay.com/itm/Mercedes-Benz-Air-Mass-Flow-Sensor-MAF-OEM-Original-BOSCH-Germany-0280217810-/190772975906?hash=item2c6af49922&vxp=mtr
*
ZAYED,,
you can get one locally cheaper, around ($150), from E-bay or Amazon:-
http://www.ebay.com/itm/Mercedes-Benz-Air-Mass-Flow-Sensor-MAF-OEM-Original-BOSCH-Germany-0280217810-/190772975906?hash=item2c6af49922&vxp=mtr
*
ZAYED,,
Thread Starter
Senior Member
Joined: Jan 2011
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05 Hammer
Pulled plugs on cylinder 2 and they look fine. Swapped cylinder 1 coil pack with cylinder 2 and cyl 2 still misfired. Wires are my guess
Last edited by MProved; Sep 20, 2015 at 05:07 PM.
MBWorld Fanatic!
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From: A.D., U.A.E
2000 (W202 C200) & 2000 (W202 C55)
First put the key in position 2, then unplug the injector connector, and test the pins, if Electricity reaches to the injector, with NO cuts,,
after that star the car & see if Electricity still there continuously or not...!!
ZAYED,,
after that star the car & see if Electricity still there continuously or not...!!
ZAYED,,
Thread Starter
Senior Member
Joined: Jan 2011
Posts: 391
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05 Hammer
installed new injector, new MAF, new wires, new plugs, new coil pack. Still happening. I'm done
MBWorld Fanatic!
Joined: Aug 2006
Posts: 7,053
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From: A.D., U.A.E
2000 (W202 C200) & 2000 (W202 C55)
If all "MAF/coils/plugs/wires" are fine, then could be air leak somewhere that causes bad misfires..!,
did you check all breather hoses, or MAF breather hose or MAF upper/lower o-rings..!!
ZAYED,,
did you check all breather hoses, or MAF breather hose or MAF upper/lower o-rings..!!
ZAYED,,
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Joined: Aug 2023
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C43 AMG
The car is pulling strong for 5-150 km, then the CEL light is back on.
Always the same error.
Give me ideeas please !
First time it happend is after i stage 1 the car !
Same tuner, other c43, no problems !
