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2005 GMC YUKON DTC P0200 AND P0300, spark plug replaced, the

Customer Question
same problem, sometimes detect misfired...
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: 1 year ago.Category: GMC
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Answered in 1 hour by:
4/8/2016
GMC Mechanic: mike switzer,
 replied 1 year ago
mike switzer
Category: GMC
Satisfied Customers: 717
Experience: lead diagnostic tech at Aamco
Verified
what size engine do you have?
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Customer reply replied 1 year ago
5.3L V8
GMC Mechanic: mike switzer,
 replied 1 year 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?
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Customer reply replied 1 year ago
Hpw does it work i have snap on ultra
GMC Mechanic: mike switzer,
 replied 1 year ago
i am not familiar with the ultra do you mean solus ultra?
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Customer reply replied 1 year ago
Yes
GMC Mechanic: mike switzer,
 replied 1 year 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.
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Customer reply replied 1 year ago
but is not showing any DTC ABOUT CAM sensor
Customer reply replied 1 year ago
WHAT THE VOLTAGE IN , injectors plug, what is a good resistance in injectors ..
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mike switzer
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