cyl 4 misfire
08-18-2013, 04:10 PM
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cyl 4 misfire
Diagnosing a misfire -
144k miles 6spd 2001.5 s4
swapped plugs, coils, icms, injectors, no luck.. was thinking sh*t piston ring time! lol (even though no blue smoke or consumption of oil), but ran a compression test and am getting 165-170 on every cylinder. next I figured, carbon buildup? but I just ran seafoam (half bottle thru vacuum system, half thru oil filler) and drove the car 30 miles to get it all through the system, still no luck. the misfire is ONLY at WOT (idle is fine) and ONLY on cyl 4. I have also pulled n75 and n80 codes but that was only once (whereas cyl 4 has been cleared and comes back over and over) so I dont think they are the issue. Any input would be much appreciated!
144k miles 6spd 2001.5 s4
swapped plugs, coils, icms, injectors, no luck.. was thinking sh*t piston ring time! lol (even though no blue smoke or consumption of oil), but ran a compression test and am getting 165-170 on every cylinder. next I figured, carbon buildup? but I just ran seafoam (half bottle thru vacuum system, half thru oil filler) and drove the car 30 miles to get it all through the system, still no luck. the misfire is ONLY at WOT (idle is fine) and ONLY on cyl 4. I have also pulled n75 and n80 codes but that was only once (whereas cyl 4 has been cleared and comes back over and over) so I dont think they are the issue. Any input would be much appreciated!
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