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I can't get rid of p0391 on my 2005 SRX. I have tested the…

Customer Question
I can't get rid...

I can't get rid of p0391 on my 2005 SRX

Mechanic's Assistant: Okay, I'll connect you to the mechanic to discuss this further with you. Before I do, is there anything else you want him to know?

I have tested the sensors, swapped them, checked wiring, ECT.

Submitted: 8 months ago.Category: Cadillac
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Answered in 36 minutes by:
10/4/2017
Cadillac Mechanic: FIXITMAN, Master Technician replied 8 months ago
FIXITMAN
FIXITMAN, Master Technician
Category: Cadillac
Satisfied Customers: 17,588
Experience: ASE MASTER CERTIFIED, AA DEGREE AUTO/DIESEL TECH.
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Hello my name is***** is the vehicle running besides the code? How long does it take for the light to come back on after it is cleared? What size engine do you have?

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Customer reply replied 8 months ago
Hello Bobby. The vehicle runs extremely rough. It's a 4.6 L V8. If I clear the code it returns immediately.
Cadillac Mechanic: FIXITMAN, Master Technician replied 8 months ago

Thank you. One more question. Did you replace the cam and crank sensors?

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Customer reply replied 8 months ago
The only crank sensor I know of is Mid Engine under the intake manifold.
Cadillac Mechanic: FIXITMAN, Master Technician replied 8 months ago

It also has 4 camshaft position sensors. Two at the front of each cylinder head. It may be those, but this engine is also notorious for timing chain failures. If it is going bad then it will cause this code.

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Customer reply replied 8 months ago
I have swapped all four sensors. Removed the valve cover and check the chain. Checked the sensors on a bench test. Tested the wires. everything looks good. Still throwing a code.
Cadillac Mechanic: FIXITMAN, Master Technician replied 8 months ago

Have you checked the compression on the engine to see if the timing is off? Or check and see if engine vacuum is low when running indicating that the chain is worn.

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Cadillac Mechanic: FIXITMAN, Master Technician replied 8 months ago

When you say you "swapped all four sensors" you replaced them with new ones?

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Customer reply replied 8 months ago
all new.
Cadillac Mechanic: FIXITMAN, Master Technician replied 8 months ago

If the sensors are fine and if there is not any noise from the chain then the only other thing it can be is a bad camshaft actuator. If it is not in the correct position then this will occur. This would be on the passenger side exhaust camshaft.

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Customer reply replied 8 months ago
I have also tested and replaced the actuator.
Cadillac Mechanic: FIXITMAN, Master Technician replied 8 months ago

So the timing chain is new, the actuator is good, and the sensor is new? If this is the case then you have a circuit issue. Does your scan tool allow you to see the sensor reading and wave form?

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Customer reply replied 8 months ago
No. Im only using an OBD2 scanner. I want to taste your service, but I didn't get much of an answer. I have already done everything you suggested. What do I do from here?
Cadillac Mechanic: FIXITMAN, Master Technician replied 8 months ago

What were your compression readings during your compression test? What does engine vacuum read at idle?

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Customer reply replied 8 months ago
I was getting 120 PSI on all cylinders. At least all the driver side cylinders
Cadillac Mechanic: FIXITMAN, Master Technician replied 8 months ago

Did you test any of the passenger side cylinders? If you move the crank slightly by hand right now how much movement do you get before the cams on that side of the engine move?

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