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S4 misfire, please help

  #1  
Old 06-02-2009, 01:47 PM
1st Gear
Thread Starter
Join Date: Dec 2007
Posts: 23
Default S4 misfire, please help

My stage 2 2000 s4 is having misfire problems. The code is P0300 (random/multiple misfires). I replaced the spark plugs (gapped to .028) and I just replaced all 6 coilpacks and the problem still persists. The car sputters and doesn't have much power. It throws 4 codes which are as follows:

P1118
Manufacturer Control.
Fuel Air Metering

P0300
Random/Multiple
Cylinder
Misfire Detected

P1114
Manufacturer Control
Fuel Air Metering

P0140
O2 Sensor
CKT No Activity
(Bank 1 Sensor 2)


I'm thinking either MAF or 02 sensors but please give input

Thanks,
Klaus
 
  #2  
Old 06-04-2009, 11:32 AM
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Join Date: May 2009
Posts: 1
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Looks like the proof is right in front of you. Unplug your MAF to test whether or not it is bad. But, looks like you need a new O2 sensor.
 
  #3  
Old 06-04-2009, 01:14 PM
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Location: kentucky
Posts: 1,111
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do the maf.. the o2 code is a catalyst monitoring code and has nothing to do with drivability.. the maf can be reading way off and cause the ecu to command rich or lean, and that will cause a misfire, your p0300 code...you could also have a vacuum leak which could cause a maf code.. id replace the sensor though....
 
  #4  
Old 06-04-2009, 06:50 PM
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Location: Redmond, WA
Posts: 203
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That gap is too large. Gap it between .016 - .020 and tell us if the misfire is gone. I had the same problem few months back. Smaller gap fixed the problem.
 
  #5  
Old 06-05-2009, 12:28 AM
2nd Gear
Join Date: Sep 2008
Location: kentucky
Posts: 1,111
Default

Originally Posted by mys4.org View Post
That gap is too large. Gap it between .016 - .020 and tell us if the misfire is gone. I had the same problem few months back. Smaller gap fixed the problem.
and so what do the plugs have to do with the air fuel metering code?? nothing.. start with the maf.. smaller gap def is better, especially if your running a stage 2 tune..
 
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