mis fire but no code did change allredy egrvalve,coil plugs,feul pump,injuctor , on 2003 Mazda Protege5

my macnice change these parts thats i wrotre on top but problam still in car when stop intersciton no exilator car do vibration and feel like engion going to shut off

by in Elmira, NY on May 04, 2013
1 answer
ANSWER by on May 30, 2013
I would recommend doing a compression test on all cylinders. It is possible that you have low compression on 1 or more cylinders. You should see a compression reading of 130-160psi. You may also want to check the vacuum in the intake manifold at idle, it should be 16-18 inches of vac. Is it possible you have a timing belt/chain issue? If you have jumped time this could cause a misfire as well. Personally I would recommend a mechanic that properly diagnoses your problem rather than just throw parts at it hoping that will cure your problems. Hope this info was helpful to you.

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