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mike switzer
mike switzer,
Category: GMC
Satisfied Customers: 448
Experience:  lead diagnostic tech at Aamco
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2005 GMC YUKON DTC P0200 AND P0300, spark plug replaced, the

Customer Question

2005 GMC YUKON DTC P0200 AND P0300, spark plug replaced, the same problem, sometimes detect misfired in 1 sometimes in 2 , 7 and 8 SOMETIMES.
Submitted: 8 months ago.
Category: GMC
Expert:  mike switzer replied 8 months ago.
what size engine do you have?
Customer: replied 8 months ago.
5.3L V8
Expert:  mike switzer replied 8 months ago.
sounds like your cam sensor and or cranks sensor are going bad do you have a lab scope you would be able to use?
Customer: replied 8 months ago.
Hpw does it work i have snap on ultra
Expert:  mike switzer replied 8 months ago.
i am not familiar with the ultra do you mean solus ultra?
Customer: replied 8 months ago.
Yes
Expert:  mike switzer replied 8 months ago.
the solus ultra is not a lab scope it is only a scanner. a lab scope allows you to backprobe the cam and crank sensor to monitor their signal. without it you will have a tough time figuring out whether or not you have a good signal from them. but i would definitely look at those first. you have no variable valve timing so the only things telling it when to fire or when you dump fuel are those two sensors.
Customer: replied 8 months ago.
but is not showing any DTC ABOUT CAM sensor
Expert:  mike switzer replied 8 months ago.
i have attached a flow chart to diagnose the p0200 which you will want to take care of first. this code is causing the p0300
Customer: replied 7 months ago.
WHAT THE VOLTAGE IN , injectors plug, what is a good resistance in injectors ..

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