2003 Mazda Protege5 Q&A

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

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 -
Answer 1
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. -