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2005 yukon xl 1500 5.3 driving me insane

Yukongonebad

By Yukongonebad
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Yukongonebad Enthusiast

Yukongonebad

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I have been trying to figure out what's going on with my moms Yukon. Replaced trans a month ago ran fine then she calls saying its on the side of the road has no power and missing. I get it home and replace plugs and wires. No fix so then pull intake and replace knock sensors and intake gaskets and clean the fuel injectors which was fine. No fix. I then get a reader from a friend and get a P101,P102,P342 codes so I change the cam position sensor. No Fix. I checked the fuel psi notice it goes from 50 to 40 lbs so you guessed it I changed the fuel pump (which is a heck of a job by yourself) NO FIX. I forgot to mention I also replaced the throttle body. Went ahead and changed the crank position sensor also just because I guess I love throwing money away lol. NO FIX. I have checked all harnesses and wires back to the ECU and all are working as should. If anyone has a clue I'm all ears Thanks

Yukongonebad Enthusiast

Yukongonebad

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I have been trying to figure out what's going on with my moms Yukon. Replaced trans a month ago ran fine then she calls saying its on the side of the road has no power and missing. I get it home and replace plugs and wires. No fix so then pull intake and replace knock sensors and intake gaskets and clean the fuel injectors which was fine. No fix. I then get a reader from a friend and get a P101,P102,P342 codes so I change the cam position sensor. No Fix. I checked the fuel psi notice it goes from 50 to 40 lbs so you guessed it I changed the fuel pump (which is a heck of a job by yourself) NO FIX. I forgot to mention I also replaced the throttle body. Went ahead and changed the crank position sensor also just because I guess I love throwing money away lol. NO FIX. I have checked all harnesses and wires back to the ECU and all are working as should. If anyone has a clue I'm all ears Thanks

Jglew82 Enthusiast

Jglew82

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Check your MAF. Also check your wiring for damage. 101 and 102 are MAF failure related. Unplug the maf and see if it runs better (switches to SD mode).

riverbanks Senior Enthusiast

riverbanks

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Try running it with MAF electric connection unplugged,see if  it improves and check that connection and look to see if you have a air leak

Yukongonebad Enthusiast

Yukongonebad

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I've tried that also. Truck will crank and run like a champ in park. soon as its put in rev or drive no power.

Yukongonebad Enthusiast

Yukongonebad

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Thanks, Ive unplugged during idle and noticed not much difference but have not tried while attempting to drive. Will give it a shot

Yukongonebad Enthusiast

Yukongonebad

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I dropped the exhaust just to verify cats are not plugged and same issue with or without. The scan tool I was using is just a cheap one with no live feed. I'm so use to the 70-early 90 model vehicles that the average back yard trying to save a dollar mechanic could work on. Thinking I'm just gonna work a weekend of overtime and send this one to a shop.

Yukongonebad Enthusiast

Yukongonebad

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My dad bought this for my mom about a year before he passed. Most would probably just sell with it having over 200k on it but every time I get in it you can feel him riding with you. One of those things in life you just don't let go of. Sorry for the sob story.

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