Misfires at WOT - MBWorld.org Forums

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Misfires at WOT

 
Old 08-04-2017, 08:38 PM
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2011 E550 Coupe, 1992 Corvette ZR-1, 1991 368ci ZR-1, 1990 ZR-1, 1987 Callaway TT, 05 SL600, CLA45
Misfires at WOT

Getting misfires at WOT......P0300 and cylinders on both sides. I wonder if this is due to my air intake setup, I added a 3" silicone intake with KN filters, Pressure sensors not hooked up....thoughts?


engine runs fine and no codes after they are cleared

Last edited by LGAFF; 08-04-2017 at 08:43 PM.
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Old 08-04-2017, 10:30 PM
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Put the stock airboxes back in....no more issues...you need those pressure sensors
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Old 08-05-2017, 06:56 PM
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Ford Mondeo
This sounds like a similar story:

https://mbworld.org/forums/m275-v12-...ml#post7225313

He came to the same conclusion.

Did you get misfires straight away, or did they take some time to appear?

Nick

Last edited by Welwynnick; 08-05-2017 at 07:00 PM.
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Old 08-05-2017, 07:04 PM
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Took time and progressively worse
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Old 08-05-2017, 07:10 PM
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It would over rev and boost quickly, not good....stock airboxes and no issues, posted a fix on his string
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Old 09-01-2017, 09:20 PM
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2011 E550 Coupe, 1992 Corvette ZR-1, 1991 368ci ZR-1, 1990 ZR-1, 1987 Callaway TT, 05 SL600, CLA45
So I am now getting misfires typically it was only when the car was just getting warmed up, today it happened about 20 minutes of driving, I usually get a P0300, and random cylinders..... 7 8 10 today; but 3, 5 a few drives ago so its not exclusive to one side.

Hard to pin down at this time, would it be worth disconnecting the battery and resetting everything....and which battery do I disconnect?
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Old 09-09-2017, 05:04 PM
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2011 E550 Coupe, 1992 Corvette ZR-1, 1991 368ci ZR-1, 1990 ZR-1, 1987 Callaway TT, 05 SL600, CLA45
Misfires are seeming to occur only when tipping into the throttle from a roll, part throttle....45-50...then hard throttle or tip in ...

P0300
FLsys1 CL
FLsys2 CL
Load % 42.4%
ECT 208
ShrtFT1 -1.6
LngFT1 4.7
ShrtFT2 0.0
LngFT2 5.5
MAP KPA 105
RPM 2375
VSS(KM.h) 108
Spark -21
IAT 54 C
TP% 28.6%
Air_stat Off

Last edited by LGAFF; 09-09-2017 at 08:59 PM.
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Old 09-09-2017, 08:32 PM
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Took the tune off, issue is not presenting now....might be the tune
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Old 09-10-2017, 07:56 PM
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2011 E550 Coupe, 1992 Corvette ZR-1, 1991 368ci ZR-1, 1990 ZR-1, 1987 Callaway TT, 05 SL600, CLA45
Well after about 100 miles of trouble free driving, Check engine came on with stock tune....didn't notice it until after the CE appeared. So its not the tune, the tune just makes it worse. going to change the fuel filter and see if it helps
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Old 09-19-2017, 08:43 PM
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Well I changed the plugs when I first got the car.....pre-gap plugs. .031, I pulled them regapped to .024 and then took it out and no misfires with tune. I have had false hope with the car before on these issues, so lets give it a few days before I claim victory
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Old 09-22-2017, 09:00 PM
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No Misfires with tune.....idle is much smoother
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Old 01-11-2018, 02:46 PM
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Good news, what plugs?
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Old 01-11-2018, 03:36 PM
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NGK Iridium Ix Spark Plug (BKR6EIX)
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Old 01-11-2018, 03:42 PM
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Why those over the IFR6Q-G/?
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Old 01-11-2018, 03:52 PM
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Probably had a lot to do with trying to find 24 of the same plug and b)works for car and good reviews for application
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Old 01-12-2018, 11:43 AM
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Fair enough, if they are gapped the same they are the same apart from slightly shorter longevity. Same heat range etc.
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