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98 S70 T5 Random Misfire

2K views 4 replies 4 participants last post by  SouthsideT5 
#1 ·
I've been running into a random misfire issue with my S70. Misfires between 4 and 5 thousand under WOT and doesn't after 5k. Seems to misfire more in the higher gears. Throws P030X as well as P0300 codes.

So far I've replaced the spark plugs (Denso's), wires, distributor and fuel filter.

The car had been sitting for two or three years with some bad gas in it so I drained the tank and threw in a can of BG 44K and a full tank of fresh 91 octane.

Any suggestions would be greatly appreciated.
 
#2 ·
Well you have the wrong plugs to start unfortunately.

Need Bosch FR7DPP+ or Volvo. Yes these cars are actually that picky. Gap should be 0.028"

Sounds like spark "blowout" which is an issue caused by low coil energy or incorrect plug gap.
 
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