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peterpete190, Auto Technician
Category: Mazda
Satisfied Customers: 28244
Experience:  Auto repair Technician with 17 years experience.Past ASE and other certifications.
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Mazda CX-7 Sport: 2007 Mazda CX-7 2.3l vin 4. New turbo - new

Customer Question

2007 Mazda CX-7 2.3l vin 4. New turbo - new waste gate - good motor(used). Started good - ran good no codes until we drive in boost condition. PO234 over boost. Checked boost pressure never more than 12 lbs. In data stream we found the PCM is shutting down injectors when we feel failure. By-passed waste gate control solenoid - no change. Unplugged air by-pass valve and plugged. Problem gone , but now it trips an EGR code. Intercooler and all piping sent out to be steamed out. Exhaust back pressure less than 1 lbs. at 2500 rpm. Compared waste spring rate from old turbo to new (same). Retraced all wiring and vacuum lines, good powers and grounds. Changed MAP sensor. Cannot find a good PID list to check other PCM inputs, but everything looks good. Did a hard reset on system with no change. Cannot find any re-learn procedures for this. HELP please.
Submitted: 1 year ago.
Category: Mazda
Expert:  peterpete190 replied 1 year ago.
My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here. Inspect any wiring on the engine especially leading to any boost or MAP sensor and see if any wiring is found to be damaged or any connections corroded or spread open terminals in the connections causing this fault here.If any issues are found they will need repaired to correct this fault.If this is or was already checked and found o.k. let me know so we can continue from here. If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.Thanks Pete