bttlfedls1
New Member
Here is my situation:
My girlfriend’s father has a 2002 GMC Yukon XL that isn’t running so great.
Characteristics: When you start it up, it will rev rather high (2500rpm or higher) then run rough and choppy until warmed up. After that specified time it goes away. More definite characteristics are seen the colder it is.
My Thoughts: I’m fairly knowledgeable with cars, and own a fairly heavily modified LS1 Trans Am. My first impression was an intake manifold gasket due to the fact that is runs fine when warm (my thought was the gasket would expand).
Before they contacted me, some other guy did a whole lot of expensive work and didn’t solve the problem. From my understanding, he swapped spark plugs, injectors, and a fuel pump. Granted my GF’s father lacks knowledge on vehicles and terminology (and his English isn’t very strong), so maybe I misunderstood him but by his descriptions that’s what I deciphered.
So all in all, here are my questions that I have.
1) Does my theory seem about right? If not, give me your input.
2) Since it is in “Yukon XL” trim it has a 6.0L engine correct? Are the intake manifold’s even different between the 5.3/6.0 engines?
3) When I researched I kept running across a “lower” and “upper” gasket. When buying a replacement is there something I should know? When I went to a dealership they told me it would run about $116, sound about right?
4) I’ve swapped intake manifolds on my LSX motor before, is there anything special to watch out for?
Sorry for my noobness in the GMC Yukon Category, thank you for your time.
-David
My girlfriend’s father has a 2002 GMC Yukon XL that isn’t running so great.
Characteristics: When you start it up, it will rev rather high (2500rpm or higher) then run rough and choppy until warmed up. After that specified time it goes away. More definite characteristics are seen the colder it is.
My Thoughts: I’m fairly knowledgeable with cars, and own a fairly heavily modified LS1 Trans Am. My first impression was an intake manifold gasket due to the fact that is runs fine when warm (my thought was the gasket would expand).
Before they contacted me, some other guy did a whole lot of expensive work and didn’t solve the problem. From my understanding, he swapped spark plugs, injectors, and a fuel pump. Granted my GF’s father lacks knowledge on vehicles and terminology (and his English isn’t very strong), so maybe I misunderstood him but by his descriptions that’s what I deciphered.
So all in all, here are my questions that I have.
1) Does my theory seem about right? If not, give me your input.
2) Since it is in “Yukon XL” trim it has a 6.0L engine correct? Are the intake manifold’s even different between the 5.3/6.0 engines?
3) When I researched I kept running across a “lower” and “upper” gasket. When buying a replacement is there something I should know? When I went to a dealership they told me it would run about $116, sound about right?
4) I’ve swapped intake manifolds on my LSX motor before, is there anything special to watch out for?
Sorry for my noobness in the GMC Yukon Category, thank you for your time.
-David
