THSCC Forums

HI guys,its me..The wrx has a misfire,on one hole under load,any boost,and mis and no pwoer.stumbles badly.Sebasiten Kokoszka says spark plugs.Any one have additional advice?

please let me know.i am drivnig the ford which is fine..but cars and coffee is coming up.and i may want to drive my wrx,or maybe the truck.dunno.but would like to have it back.

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hey yall,watch this...

I would highly doubt spark plugs would cause such a sudden issue. You should pull the codes and start there. Otherwise check the intake tract for any breaks/leaks first. If the car isn't building boost that would be my first place to look.

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2017 Autocross Chief of Tech

2000 E Street Miata
2015 Focus SE EcoBoost 6 speed
2015 Fiesta ST (Wife's ride)
2012 Yamaha FZ1 sorta crotch rocket? All I know is 150HP and 487 lbs is fun!

Had an issue with my Shelby with a miss and the codes to support. The issue wasn't plugs, coil pack or the cheap stuff, it was a valve issue with a failed roller. $1100 later the car runs great with no codes. Hope it is not that deep for you.

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Erin Dressler
SSR 31
92 Miata (sold)
07 Shelby GT
06 Corvette Z06
03 Corvette Z06 (RIP)

It's a reasonable place to start. As others have pointed out, any intake or vacuum leaks, however minor, can cause all manner of odd problems.

For example, my '01 bug had various oddball errors for years... the plastic dipstick tube had cracks in it (an all too common failure.) That was enough of a vacuum leak to cause turbo issues -- it needs vacuum to open the wastegate and diverter. (the plugs, ignition coils, DV, and MAF were actually bad too.)