"mis firing"

Mercedes Girl · 03-26-2012, 09:24 PM

Ok, I need some help. I have a 2002 C32 and started having trouble when driving. Took it to my local mechanic and he thinks the engine is misfiring on 3, 4 and 6. He said it may be the plugs, it may be the wires, it may be the coils. I just got new plugs less than a year ago. Does anyone have any thoughts as to what this may be???

I appreciate any help. I love this car!

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number_one_c55 · 03-26-2012, 09:37 PM

Quote:

Originally Posted by Mercedes Girl

Ok, I need some help. I have a 2002 C32 and started having trouble when driving. Took it to my local mechanic and he thinks the engine is misfiring on 3, 4 and 6. He said it may be the plugs, it may be the wires, it may be the coils. I just got new plugs less than a year ago. Does anyone have any thoughts as to what this may be???

I appreciate any help. I love this car!

I would swap - spark plugs - wires - coil packs with other cylinder's so that way your technician can properly diagnose the issue. So swap plugs tell him to monitor the running values of the car, if misfire on 3/4/6 still exist then take step two and swap wires, then if issue still present swap coil packs. Have to take this step by step. Let your tech have the vehicle as long as he needs so he isn't rushed on working on your car! Swap them one at a time other wise what's the point...

Mercedes Girl · 03-26-2012, 09:43 PM

Thanks so much for your reply. I will definitely take this information to him.

Much appreciated!!

number_one_c55 · 03-26-2012, 09:59 PM

No worries. Any further questions or concerns feel free to send me a personal message. Were all here to help!

michael kuzni · 03-26-2012, 10:50 PM

HOLY CRAP WE FINALLY GOT A CHICK ON HERE! You can PM me with any questions about your uhh...car too

Welcome to mbworld btw

91RS · 03-27-2012, 07:10 AM

If he doesn't know how to diagnose a misfire, you need to take your car somewhere else. All he's going to do is waste your money throwing parts at it.

Lenin · 03-27-2012, 08:04 AM

Quote:

Originally Posted by 91RS

If he doesn't know how to diagnose a misfire, you need to take your car somewhere else. All he's going to do is waste your money throwing parts at it.

+1. Look for a new mechanic. Not everyone can work on Mercedes cars or for that matter has the tools and the diagnostics equipment. I would say that if your mechanic does not have his own STAR computer, go somewhere else.

loungn14 · 03-27-2012, 09:48 AM

Quote:

Originally Posted by Lenin

+1. Look for a new mechanic. Not everyone can work on Mercedes cars or for that matter has the tools and the diagnostics equipment. I would say that if your mechanic does not have his own STAR computer, go somewhere else.

I have to agree with the boys. Misfire is a pretty simple diag, and number_one_c55 listed the steps perfectly. If your guy has star like Lenin said it would make life easier...

RedStripe · 03-27-2012, 01:23 PM

It's a long story, but I chased a misfire after receiving some inaccurate information from the dealer, and it wound up being a bad upstream 02 sensor.

evilsaint · 03-27-2012, 05:43 PM

Are the wires aftermarket, more specifically Magnecor? If so, honestly, just try tightening removing the wires and putting them back on as tight as possible, maybe with a little dielectric grease on them. I've gotten a few random spurts of misfires, even when I still had stock wires, and this is an easy fix for it (for any car, really).

pww · 03-27-2012, 07:11 PM

heheh

Ms. Firing

evilsaint · 03-27-2012, 11:55 PM

Quote:

Originally Posted by pww

heheh

Ms. Firing

03-26-2012, 10:50 PM	#5
michael kuzni MBWorld Fanatic! Garage is empty, add now Join Date: Oct 2009 Location: bay area, california Posts: 2,436 Drives: 2007 E63 AMG with P2	HOLY CRAP WE FINALLY GOT A CHICK ON HERE! You can PM me with any questions about your uhh...car too Welcome to mbworld btw __________________ 2007 e63 AMG with P2 package. eurocharged ECU flash, resonator delete, yellow TTM intake scoops, charcoal filters delete, smoked side markers, CF front lip, painted black grille, tinted windows. http://www.youtube.com/watch?v=dhoFg...1&feature=plcp past cars: C55 AMG http://www.youtube.com/watch?v=66Zu8-jdyUU BMW X5 4.4i sport http://www.youtube.com/watch?v=S-zPNpRlbBU

03-27-2012, 05:43 PM	#10
evilsaint Senior Member Garage is empty, add now Join Date: Dec 2007 Location: The Windy City Posts: 484 Drives: '02 C32	Are the wires aftermarket, more specifically Magnecor? If so, honestly, just try tightening removing the wires and putting them back on as tight as possible, maybe with a little dielectric grease on them. I've gotten a few random spurts of misfires, even when I still had stock wires, and this is an easy fix for it (for any car, really). __________________ AMG Orphans Club Member #58 (We want our engine badges and we want 'em now!)

03-27-2012, 07:11 PM	#11
pww Super Member 2005 Mercedes-Benz C55 Join Date: Jun 2010 Posts: 619 Drives: '05 C55 AMG	heheh Ms. Firing __________________ ///AMG drive.S.low

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03-26-2012, 09:43 PM	#3
Mercedes Girl Newbie Garage is empty, add now Join Date: Oct 2011 Posts: 2 Drives: C32 AMG	Thanks so much for your reply. I will definitely take this information to him. Much appreciated!!

03-26-2012, 09:59 PM	#4
number_one_c55 Member Garage is empty, add now Join Date: Jun 2011 Location: Victoria Posts: 149 Drives: 2005 C55 AMG, 2004 CLK55 AMG, 1994 S500, 1999 ML320, 1991 300SL	No worries. Any further questions or concerns feel free to send me a personal message. Were all here to help!

03-27-2012, 07:10 AM	#6
91RS MBWorld Fanatic! Garage is empty, add now Join Date: Mar 2009 Location: GA Posts: 1,728 Drives: 2005 C55, 2007 Trailblazer SS	If he doesn't know how to diagnose a misfire, you need to take your car somewhere else. All he's going to do is waste your money throwing parts at it.

03-27-2012, 01:23 PM	#9
RedStripe Banned Garage is empty, add now Join Date: May 2011 Posts: 182 Drives: 2010 SLK350	It's a long story, but I chased a misfire after receiving some inaccurate information from the dealer, and it wound up being a bad upstream 02 sensor.

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03-27-2012, 11:55 PM