C32 AMG, C55 AMG (W203) 2001 - 2007

Misfire issue need help to minimize list of possibilities

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Old Oct 27, 2008 | 04:34 PM
  #51  
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LET C32 2002
Originally Posted by jgsx
I had this identical problem ~6 weeks ago (misfires only under high load/high RPM shortly after installing a larger pulley). First thing that popped into my head was plugs, but after reading the plugged cat threads on here, I figured that was it. Checked the cats and they were fine. Checked the plugs and they gaps were off. Put in a fresh set of properly gapped plugs, and the problem went away.
very re-assuring
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Old Oct 27, 2008 | 05:06 PM
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Originally Posted by LETMotorsports
Glenn - With his plugs gapped at .41 and .45, 22 PSI is blowing out his spark causing the misfire.

They should be gapped at .34 - .38 max.

Why wouldn't his car be able to take the boost when others can?

This quote is right out of a repair handbook in my garage.

"Random misfires may be due to fouled spark plugs, plug gap too wide, bad plug wire, weak ignition coil, cracks or carbon tracks in an ignition coil."

This is a common problem on high boost cars.

http://www.google.com/search?hl=en&r...lows+out+spark

You are right, changing his pulley back to ASP would fix the problem....because it would remove 5 lbs of boost.


Just razzing him JERRY!!!! He loves the attention. I lay off him when he breaks into the 12s.
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Old Oct 27, 2008 | 05:11 PM
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Originally Posted by c32used
If nothing by the Friday then I will make an appointment



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Old Oct 27, 2008 | 06:05 PM
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LET C32 2002
Originally Posted by Newzchspy
[/B]

Just razzing him JERRY!!!! He loves the attention. I lay off him when he breaks into the 12s.
12s are coming just standbye pretty sure they will be better then 12.76
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Old Oct 27, 2008 | 06:06 PM
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LET C32 2002
Originally Posted by Newzchspy
[/B]

Appointment is made its called at Jerrys' Saturday
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Old Oct 27, 2008 | 06:08 PM
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LET C32 2002
Talking

Originally Posted by Newzchspy
[/B]

Whats up with this?
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Old Oct 27, 2008 | 06:25 PM
  #57  
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Originally Posted by c32used
Whats up with this?

You know I luv ya baby!!!
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Old Nov 2, 2008 | 09:49 PM
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LET C32 2002
Well misfire gone It was as AMG-Jerry stated the plugs

Also much thanks to him and all who helped with installing my new plugs

Glenn let me know when you are ready
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Old Nov 2, 2008 | 10:49 PM
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Originally Posted by c32used
Well misfire gone It was as AMG-Jerry stated the plugs

Also much thanks to him and all who helped with installing my new plugs

Glenn let me know when you are ready
as usual...Jerry knows all....
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Old Nov 3, 2008 | 04:12 PM
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Originally Posted by loungn14
as usual...Jerry knows all....
I'm ready and waiting Victor........................... Maybe those phenolics I bought from you will give me that 12.32 I am seeking
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Old Nov 3, 2008 | 04:18 PM
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LET C32 2002
Originally Posted by Newzchspy
I'm ready and waiting Victor........................... Maybe those phenolics I bought from you will give me that 12.32 I am seeking
I think perfect launch and it may be had with lighter car maybe lighter Renntech rims with good thread.......Fongflex did 12.38 with 178mm,SL55 splitter,Tune and Renntech Monolites...so it is possible
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Old Nov 3, 2008 | 04:37 PM
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Originally Posted by c32used
I think perfect launch and it may be had with lighter car maybe lighter Renntech rims with good thread.......Fongflex did 12.38 with 178mm,SL55 splitter,Tune and Renntech Monolites...so it is possible



I heard a lil more than that, BUt a 12.38 is still rockin!!!
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Old Nov 3, 2008 | 05:01 PM
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Originally Posted by c32used
Well misfire gone It was as AMG-Jerry stated the plugs
It's nice when it's the least expensive option that fixes the problem
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Old Nov 3, 2008 | 05:11 PM
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Originally Posted by ChicagoX;3147322[B
]It's nice when it's the least expensive option that fixes the problem
[/B]

Speaking of which, what is the recommendation for 1. Plugs and 2. Gap for those plugs?

Glenn
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Old Nov 3, 2008 | 05:24 PM
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LET C32 2002
Originally Posted by Newzchspy
[/B]

I heard a lil more than that, BUt a 12.38 is still rockin!!!
Well if you go to the drag times thread I believe on pages 2-4 there is a post with timeslip on it showing the 12.38 and the mods
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Old Nov 3, 2008 | 05:29 PM
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LET C32 2002
Originally Posted by Newzchspy
[/B]

Speaking of which, what is the recommendation for 1. Plugs and 2. Gap for those plugs?

Glenn
There are different choices but I prefer and use Denso Iridium IK20 #5304 and we gapped it at .37
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Old Nov 3, 2008 | 06:17 PM
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Originally Posted by c32used
There are different choices but I prefer and use Denso Iridium IK20 #5304 and we gapped it at .37




What's Jake runnin and at what gap???
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Old Nov 3, 2008 | 06:32 PM
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LET C32 2002
Originally Posted by Newzchspy
[/B]

What's Jake runnin and at what gap???
NGKs as stated in his sig but gap maybe between .33-.37
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Old Nov 18, 2008 | 03:33 PM
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Black on Black stock ' 03 C32
Originally Posted by c32used
Ok bought a bottle of Octane booster and Cheveron Techeron and refilled with 93 octane for the 4/5th time in a row...
I have had several cars in the last years, none as nice as My C32, but I have noticed that even the crappy ones will run better on Cheveron 93. The most finicky was a 96 Ford Windstar with the HO 3.8 V6. Changing nothing else but running Cheveron 93 it would run smooth at idle and pull even. Any other other brand, and it kind've trembled at idle, and slightly hesitated.

BTW: anything less than 93 in the C32, and it doesn't like it; just not the same car. (Not brand specific)

Just my .02:
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Old Nov 18, 2008 | 05:03 PM
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Originally Posted by t1n0
I have had several cars in the last years, none as nice as My C32, but I have noticed that even the crappy ones will run better on Cheveron 93. The most finicky was a 96 Ford Windstar with the HO 3.8 V6. Changing nothing else but running Cheveron 93 it would run smooth at idle and pull even. Any other other brand, and it kind've trembled at idle, and slightly hesitated.

BTW: anything less than 93 in the C32, and it doesn't like it; just not the same car. (Not brand specific)

Just my .02:



: Or you could run 89 Octane from this station and run a 13.2
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Old Nov 18, 2008 | 11:39 PM
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Originally Posted by Newzchspy
[/B]

: Or you could run 89 Octane from this station and run a 13.2
That's hilarious.
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Old Dec 8, 2008 | 12:46 PM
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LET C32 2002
I figured I give an update with a couple of pictures...lmao

Since plug replacement car runs fabulous with no misfires and the old way of thinking of running 89 octane fuel is out the window...thank God the fuel prices are quite a bit down I can save money now while before I had to visit the bank frequently.
Attached Thumbnails Misfire issue need help to minimize list of possibilities-gas-1.jpg   Misfire issue need help to minimize list of possibilities-gas2.jpg  
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Old Dec 8, 2008 | 07:20 PM
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Originally Posted by c32used
I figured I give an update with a couple of pictures...lmao

Since plug replacement car runs fabulous with no misfires and the old way of thinking of running 89 octane fuel is out the window...thank God the fuel prices are quite a bit down I can save money now while before I had to visit the bank frequently.
Costco Lake Zurich had Premium 93 Octane this weekend for $ 1.70 per gallon.
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