How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15133
Experience:  GM Grand Master Technician 2007. 14 years experience.
10949255
Type Your Chevy Question Here...
GM Tech (Cam) is online now
A new question is answered every 9 seconds

2009 Malibu 2.4 no start unplug cam sensor starts with it

Customer Question

2009 Malibu 2.4 no start unplug cam sensor starts with it plugged in no start
Submitted: 1 year ago.
Category: Chevy
Expert:  Jared D replied 1 year ago.

If the engine starts with the cam sensor unplugged it usually indicates that it has jumped time. Has any work been performed recently?

Customer: replied 1 year ago.
no checked timing marks ok
Expert:  Jared D replied 1 year ago.

Check the resistance of the Intake Camshaft Position (CMP) actuator solenoid. Resistance should be between 5-9 ohms at room temperature. Note: Compare the resistance to exhaust solenoid next to it, should be the same.

Expert:  Jared D replied 1 year ago.

Any trouble codes?

Expert:  Jared D replied 1 year ago.

I have to step away for a few minutes, do you want me to opt out and let someone else pick it up or are you ok to wait?

Customer: replied 1 year ago.
po507
Expert:  Jared D replied 1 year ago.

The p0507 is a throttle position sensor code. It shouldn't affect the starting by unplugging the cam sensor if the throttle is at fault.

Have you checked the resistance of the CMPs?

Customer: replied 1 year ago.
Replaced them
Customer: replied 1 year ago.
Still need help
Expert:  Jared D replied 1 year ago.

So you replaced them in an attempt to fix the problem or you replaced them because they tested faulty?

If you start and run the engine with the cam sensor unplugged will it set a cam sensor code?

Customer: replied 1 year ago.
Replaced to solve problem. Yes code sets
Expert:  Jared D replied 1 year ago.

Have you tried replacing the cam position sensor? If it is the only apparent thing causing it to not start you should probably replace it to eliminate it as a possible cause.

Customer: replied 1 year ago.
Already did
Expert:  Jared D replied 1 year ago.

I'm convinced that the timing is off. That's the only way it would affect the engine starting by unplugging the cam position sensor.

Would you like to save a little time on back and forth by listing the things that you have already replaced and tested?

It might make diagnosis a little easier.

Customer: replied 1 year ago.
Cam actuated sendors
Customer: replied 1 year ago.
Replaced cam sensors and actuators
Customer: replied 1 year ago.
Checked timing marks ok
Customer: replied 1 year ago.
I will check again marks

Related Chevy Questions