my 04 Yukon with 5.3 just recently began to die on me as I would reach 2000rpm approximately around 40mph, when that happens CEL blinks. Just recent had new fuel filter put in o2 sensors, plugs/wires, new battery etc TPS is clean. Only thing have not checked is clogged cat and MAS. But just recently put on new Spectre air intake. Any suggestions please help.
Yukon dying at certain RPMs
- Thread starter Fssredo
- Start date
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swathdiver
Full Access Member
What trouble codes are you getting? Seems like a plugged cat at first glance.
Only codes reading is random multiple misfire, and ABS ECM code that’s it
swathdiver
Full Access Member
Fuel filter? You dropped the tank and changed the screen? P0300 and which ABS code?
Brand new fuel filter has no miles on it, and I’m not sure the exact ABS code I’m gonna do anther Testing and which screen in the tank
swathdiver
Full Access Member
I was confused. Missed your mention that this truck GMT800 and this post is in GMT900 section which do not have fuel filters. @NathanJax
Ok, new air intake and then codes. Check your fitment and for leaks. Even being slightly off can allow un-metered air into system and throw codes because MAS is not measuring it. Check the hoses from the valve covers to the throttle body and intake (PCV) too.
Ok, new air intake and then codes. Check your fitment and for leaks. Even being slightly off can allow un-metered air into system and throw codes because MAS is not measuring it. Check the hoses from the valve covers to the throttle body and intake (PCV) too.
I was getting P0300 when my cats were plugged, flashing CEL. Also TPS and MAF codes. Plugged cats can cause all sorts of intake/ misfire related codes. Have a shop check them.
