Morning Everyone

on the way home from work last night the CEL light started flashing at me at around 5k rpm i throttled off and continued to flash then it fully stayed on.

nursed it home got the code reader out and come up with

P0301 Cylinder 1 misfire detected
p0303 Cylinder 3 misfire detected

car seems to be fine at idle and low revs, plugs are less than a thousand miles. is there anything else that could cause it to misbehave like this?
cars a 2001 bug wrx unmodded with 130k

many thanks

 

compresion test it and swop the coil pack around to see if the fault codes change cylinder

 

Neutral position switch possibly faulty

 

Isnt that CEL light but no code stored?

 

alot of the time no cel light at all

 

MAF. I had the same thing with the misfire codes, wiped the codes then got the dead MAF code instead. Didn't really need it though as it was obvious! lol

 

I cleared the code before I came to work and gave it a good spanking to force it to do it again. But nothing came up?

Is there any definitive way to test NPS and MAF? Also why would NPS through misfire code? How does it work?

Thanks

 

Nope, but there's a definitive fix!

 

From what I remember it can throw the cel and other times it won't, also it can show as a misfire code iirc and can vary on cylinders.

I'm not sure if a proper diagnostic tool like the snap-onn scanner we use will pick up the problem on the voltage side of things as it thinks the car is not in a gear.