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Dan, Technician
Category: Mazda
Satisfied Customers: 24579
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Have a mazda 2003 prodege 2.0L has a po303 code changed

Customer Question

Have a mazda 2003 prodege 2.0L has a po303 code changed plugs,wire,injector, coil,ck for intake leaks and fuel pressure all good.still not running on 4 cly I give up
Submitted: 1 year ago.
Category: Mazda
Expert:  Dan replied 1 year ago.

Hello, my name is***** you done a compression test? Thanks.

Customer: replied 1 year ago.
125 all
Expert:  Dan replied 1 year ago.

Have you verified spark is good and verified injectors have good power and ground pulse?

Expert:  Dan replied 1 year ago.

Minimum compression for this engine is 139 psi but it should normally be close to 180. All cylinders have 125?

Customer: replied 1 year ago.
Ck spark is very good and injector pulse is good
Expert:  Dan replied 1 year ago.

All cylinders have a 125 psi?

Customer: replied 1 year ago.
1,has 135 2 has 130 3 cly 125 and 4 138
Expert:  Dan replied 1 year ago.

Considering what all has been replaced and tested I don't see any other possible problem besides the low compression. Like I said, book says minimum compression should be 138 psi. Next step is to do a cylinder leak down test to see if air is being lost through intake valve, exhaust valve, or piston ring then make repair as needed. Let me know if you have more questions, thanks.

Customer: replied 1 year ago.
Ok thanks
Expert:  Dan replied 1 year ago.

No problem, sorry it isn't something more simple. Let me know how it turns out or if you run into questions. Have a good day!