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I have 94 buick century it will crank after 4 starts with foot on gas pedal i replace coil packs mass air flow egr value fuel filter when it do crank it runs pretty good but motor has slight mist is this the fuel injector
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Do you know how to check for vacuum leaks ?
Visually and physically inspect the following areas for vacuum leaks:
• Intake manifold.
• EGR adapter.
• EGR valve.
• EGR feed pipes.
• Injector O-rings.
There are videos on youtube showing how to do this ? I would suggest to you to have a diagnostic shop check engine sensor data with a scan tool that can display this data. ,Especially the mass air flow sensor . All the money you put into the parts would have had it fixed already .
Did you check for spark? It sounds like you're not getting spark. Check for spark. If you are not getting spark then it sounds like you might have to replace the coil packs. Is it running a L4 engine? If its running a standard chevy L4 its probably the coil packs. Try to replace them check again for spark.
running rough, could be a few possible things besides spark plugs, and wires! air filter, fuel filter, fuel injectors, fuel pump, coil pack, Etc. Id start with the air and fuel filters! Good luck, Hope this helps!
to properly clean and test the egr valve you should remove it from the car. disconnect vacuum, elect connectors, and check the gasket surface both on the manifold and on the base of the valve. you will need to buy or cut a new gasket most likely. when you apply vacuum to the control inlet, you should see the valve lift away from the seat. I use brake cleaner and compressed air to spray clean and blow out the valve just to test it and then go from there depending on what you find ---- one of the vacuum switches that controls it or a faulty vacuum line is a likely possibility also ---- so you should check them also. a vacuum pistol comes on really helpful here.
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