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Dan
Dan, ASE Certified Technician
Category: Mazda
Satisfied Customers: 1374
Experience:  Dealer Auto Technician
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2009 cx7 New motor, battery, turbo, etc. No spark at the

Customer Question

2009 cx7
New motor, battery, turbo, etc.
No spark at the plug, has good fuel pressure.
Not immobiliser, far as I can tell
Submitted: 1 month ago.
Category: Mazda
Expert:  Dan replied 1 month ago.

Hello my name is***** am an ASE Master Technician and I am glad to help you with your question.

Expert:  Dan replied 1 month ago.

Check the crank sensor, this is what controls spark on this engine.

Customer: replied 1 month ago.
New sensor
Customer: replied 1 month ago.
Fuses are all good as well
Expert:  Dan replied 1 month ago.

Do you have any codes?

Expert:  Dan replied 1 month ago.

The next step would be looking at a engine control module problem.

Customer: replied 1 month ago.
No codes
Expert:  Dan replied 1 month ago.

Do you have a wiring diagram of the engine harness?

Customer: replied 1 month ago.
No
Expert:  Dan replied 1 month ago.

I can send you one if you would like.

Customer: replied 1 month ago.
K. So got it to where it will fit for like 3 revs then same thing
Customer: replied 1 month ago.
Sorry. I meant fire
Customer: replied 1 month ago.
Gonna check in a few minutes to see if I have constant spark
Customer: replied 1 month ago.
sparks one time and then nothing
Expert:  Dan replied 1 month ago.

Unplug the cam sensor and see if it will spark.

Customer: replied 1 month ago.
Unplugged the sensor. Same thing. One spark
Expert:  Dan replied 1 month ago.

There is a capacitor on the right rear of engine I would check this as well.

Expert:  Dan replied 1 month ago.

Check the engine fuse 15 amp, left end of dash.

Customer: replied 1 month ago.
Fuse is good. Where's the capacitor at
Customer: replied 1 month ago.
I'm not seeing any capacitor
Customer: replied 1 month ago.
Capacitor is supposed to have 2 wires right? I found it by the way. Been a long day
Customer: replied 1 month ago.
Switched out capacitor and still o e spark then nothing
Expert:  Dan replied 1 month ago.

This sounds like a pcm problem, I would swap out the engine computer on this.

Customer: replied 1 month ago.
Do I need to re flash the computer even though it has the same ids
Customer: replied 1 month ago.
Also there is a humming noise coming from the throttle body along with a clicking sound from the computer. Thoughts
Expert:  Dan replied 1 month ago.

Yes, you have to program the pcm to recognize the keys or it will not start.

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