the P0300 misfire.
possibles (many)
1- loss of spark dah. ( dizzy or Cas)
2- loss of compression.
3- cam belt slipped ( you didnt Say what engine 1.6v or 1.8v sport so this is a guess)
4- Egr stuck open , destroying a/f mixuture with inert gas.
5- Air leaks in to the induction ( from anywhere to the right of MAF sensor.
your car is unique in that it has 2 CAS sensors,
one in the DIZZY and another seperate one.
I believe the DIZZY sets the drum beat and the real CAS tells the ECU when #1 is firing.
cam angle and crank angle sensors they are....
On this engine , it can tell you WHICH spark plug is misfiring. P0301 = plug 1. and so on.
On this engine , code 300 is general misfire.
so I would suspect #2 #3 or #4 modes and not dizzy after replacing it.
300 means, all cylinders are randomly misfiring.
I'd pound the carbon out of EGR valve and get it closed up and maybe even pull the vacuun line to it and plug this line up.
only to do testing, put back soon.
keep in mind misfire is "crank shaft did not show evidence of a power pulse", or that it did not accelerate while rotating. Each time a cyclinder fires the cark jumps, the ECU measures this jump. No Jump = misfire ( it wont lie to you , trust that )
P0300 fails are FIRST ORDER of Business, (it will kill any cat).
Think in terms if cyclinder mixture and then spark, boom
anything that can foul the mix will stop the boom.
you need a proper manual.
what do you need ,I send. (cas and dizzy?)
Last edited by jtgh : 12-12-2007 at 01:15 PM.
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