Help with CEL on 04 Sl55. Engine hesitation/Vibration

NikleinR6 · 11-03-2009, 07:19 PM

I am new to this 2004 Sl55 with 78,000mi on it. I began to notice a vibration/misfire at around 2000rpm while driving and slight misfire at idle. Its a sort of hesitation at cruise, but at WOT i don't really feel it, and power comes on strong.
I thought it was possibly the spark plugs, so i replaced all 16 with OEM NGK laser plugs. I also replaced the air filters while i was in there..
Afterwards the problem still exists. I notice the vibration with the engine in Park/Neutral as well as drive @ 2000RPM. I then thought it might be the motor mounts, as they seem to be a common problem with these cars.
Yesterday I got a CEL to come on. I decided to run the car by Advance auto and AutoZone to have it scanned, and their Actron scanners couldn't connect.
I'm thinking the problem is either a coil pack, maf, or engine mounts.
Aside from going to the local dealer, how can i determine what the light is for?
Also, why won't the Actron scanners connect?
Any ideas what my problem could be?
Thanks

To remove this ad, register today or login if you already are registered!

htn · 11-03-2009, 08:03 PM

you have any sort of third party warranty??????????

NikleinR6 · 11-03-2009, 08:28 PM

Quote:

Originally Posted by htn

you have any sort of third party warranty??????????

Was actually looking into purchasing one before the problem began......
So No, at present i do not...

jmf003 · 11-03-2009, 08:37 PM

Unfortunately it could be anything, including things unrelated to the vibration.

My Actron CP9175 works fine on my SL55, for what it's worth.

If you can track down someone with a Star Diagnostics system that will certainly read the codes for you.

Good luck!

TheWorkshopMB · 11-04-2009, 02:09 AM

Quote:

Originally Posted by NikleinR6

I am new to this 2004 Sl55 with 78,000mi on it. I began to notice a vibration/misfire at around 2000rpm while driving and slight misfire at idle. Its a sort of hesitation at cruise, but at WOT i don't really feel it, and power comes on strong.
I thought it was possibly the spark plugs, so i replaced all 16 with OEM NGK laser plugs. I also replaced the air filters while i was in there..
Afterwards the problem still exists. I notice the vibration with the engine in Park/Neutral as well as drive @ 2000RPM. I then thought it might be the motor mounts, as they seem to be a common problem with these cars.
Yesterday I got a CEL to come on. I decided to run the car by Advance auto and AutoZone to have it scanned, and their Actron scanners couldn't connect.
I'm thinking the problem is either a coil pack, maf, or engine mounts.
Aside from going to the local dealer, how can i determine what the light is for?
Also, why won't the Actron scanners connect?
Any ideas what my problem could be?
Thanks

Well, the harsh vibration and or booming sound in park/neutral @ around 2000 rpm, is in most cases (99.3% of the time) attributed to the rear engine mount (transmission mount), at our mileage, its probably original and should be replaced, afterwards you will notice the concern gone.....

The misfire is another story....

The fault codes, well you will need a star or xentry mercedes benz platform scanner/laptop to get the most accurate information on the cel...

kiamcoj · 11-04-2009, 02:48 AM

I would venture out a guess and say its the MAF sensor. Just as the other's have stated, hook it up to Star and it will definitely tell you. Good luck!

NikleinR6 · 11-04-2009, 08:03 AM

Thanks guys..
I have a buddy that has a different obd2 scanner so i will try it tomorrow.
I would really like to have my own, so i really didn't want to give the dealer 100+ to scan the car, and would rather use the money to purchase a compatible scanner for myself.
Maybe a ScanGuage2 is in my near future..
If his scanner doesn't work, I will most likely take it to the dealer so i can begin to get this problem sorted.

Also, i don't think i am going to drive the car much until i figure out if it is some sort of misfire. I would hate for 1 cylinder to not be firing, and have piston wash as the result >lead to ring failure, gas in the oil, and eventually bearing failure as well.
Maybe someone can answer this for me> Why do we have 2 spark plugs per cylinder? Is it for emission purposes, and both plugs fire at the same time for complete fuel burn? OR Is it for performance purposes, and 1 plug fires until you begin to build boost/accelerate hard and then the second plug comes online to prevent plug blowout??

Also, I was thinking of changing all the engine mounts and trans mount anyway. I have heard it is difficult, but not impossible. I have pulled and reinstalled engines countless times on different vehicles, so I guess i will see what i am getting myself into as i go.. I have heard the engine just has to be lifted a couple of inches in order to remove the mounts.
Any tips or tricks i should be aware of??
Nick

benz_addict · 11-04-2009, 06:44 PM

you might have a P0106 code, that is what I got on mine too. Same engines.

If it's not keep us updated!

NikleinR6 · 11-05-2009, 07:37 PM

Well, I just got back into town... I started up the car to head over to my buddies house with the scanner, and the check engine light never came on???

I am really thinking i have some sort of misfire problem. How can i test the coil packs. On previous cars, i would just pull the plug, ground it, and look for spark. But i have not worked on this advanced type of vehicle yet..
Any ideas how to check the coil packs for proper operation?

Nick

2003 S600 · 11-05-2009, 08:20 PM

spark plugs fire alternately, not at same time. prob helps them last longer. Any scan tool should read the codes. I had misfires on both banks and had to replace both coil packs. You are lucky, you can replace individual ones.

11-03-2009, 08:37 PM	#4
jmf003 MBWorld Fanatic! Join Date: Dec 2005 Location: Ann Arbor Posts: 1,261 Drives: '03 SL55	Unfortunately it could be anything, including things unrelated to the vibration. My Actron CP9175 works fine on my SL55, for what it's worth. If you can track down someone with a Star Diagnostics system that will certainly read the codes for you. Good luck! __________________ Lowest ET: 11.4 seconds Best Trap: 126 mph Mod list: VRP VR600 package (175mm crank pulley, 80mm TB, ECU tune, K&N filters, with Evosport shorty headers instead of VRP), PTE thermostat, Quaife LSD, SLR cams, VRP supplemental heat exchanger

11-04-2009, 02:48 AM	#6
kiamcoj MBWorld Fanatic! Join Date: Nov 2006 Location: LB-CA Posts: 2,088 Drives: 2003 CLK500	I would venture out a guess and say its the MAF sensor. Just as the other's have stated, hook it up to Star and it will definitely tell you. Good luck! __________________ -Jon

11-04-2009, 06:44 PM	#8
benz_addict Super Member Join Date: Jan 2007 Location: Toronto, Mississauga Posts: 956 Drives: CL55 ///AMG	you might have a P0106 code, that is what I got on mine too. Same engines. If it's not keep us updated! __________________ CL55 AMG V8 Kompressor - ECU tune, primary cat delete, CM30 IC pump, 285/35/18 street setup E430 4Matic - black/black 5% limo tints - winter killer *Mississauga Crew*

11-05-2009, 07:37 PM	#9
NikleinR6 Newbie Join Date: Oct 2009 Posts: 12 Drives: 2004 Sl55	hmm Well, I just got back into town... I started up the car to head over to my buddies house with the scanner, and the check engine light never came on??? I am really thinking i have some sort of misfire problem. How can i test the coil packs. On previous cars, i would just pull the plug, ground it, and look for spark. But i have not worked on this advanced type of vehicle yet.. Any ideas how to check the coil packs for proper operation? Nick

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes	Rate This Thread
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode	Rate This Thread:

11-03-2009, 08:03 PM	#2
htn Member Join Date: Dec 2007 Posts: 126 Drives: sl55	you have any sort of third party warranty??????????

11-04-2009, 08:03 AM	#7
NikleinR6 Newbie Join Date: Oct 2009 Posts: 12 Drives: 2004 Sl55	Thanks guys.. I have a buddy that has a different obd2 scanner so i will try it tomorrow. I would really like to have my own, so i really didn't want to give the dealer 100+ to scan the car, and would rather use the money to purchase a compatible scanner for myself. Maybe a ScanGuage2 is in my near future.. If his scanner doesn't work, I will most likely take it to the dealer so i can begin to get this problem sorted. Also, i don't think i am going to drive the car much until i figure out if it is some sort of misfire. I would hate for 1 cylinder to not be firing, and have piston wash as the result >lead to ring failure, gas in the oil, and eventually bearing failure as well. Maybe someone can answer this for me> Why do we have 2 spark plugs per cylinder? Is it for emission purposes, and both plugs fire at the same time for complete fuel burn? OR Is it for performance purposes, and 1 plug fires until you begin to build boost/accelerate hard and then the second plug comes online to prevent plug blowout?? Also, I was thinking of changing all the engine mounts and trans mount anyway. I have heard it is difficult, but not impossible. I have pulled and reinstalled engines countless times on different vehicles, so I guess i will see what i am getting myself into as i go.. I have heard the engine just has to be lifted a couple of inches in order to remove the mounts. Any tips or tricks i should be aware of?? Nick

11-05-2009, 08:20 PM	#10
2003 S600 Member Join Date: Jan 2007 Location: ca Posts: 189 Drives: 2003 s600	spark plugs fire alternately, not at same time. prob helps them last longer. Any scan tool should read the codes. I had misfires on both banks and had to replace both coil packs. You are lucky, you can replace individual ones.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)