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  1. Bxcliff

    My 2003 GMC Yukon Denali

    I've done a lot of work on this truck since it was given to me by my dad. My parents had bought it with 5,000 miles back in 04 and it's been the family truck until we bought a 08 Suburban LTZ. My dad loved chrome back in the early 2000's so once I got ahold of it I really changed the look. I...
  2. Bxcliff

    My 2003 GMC Yukon Denali

    I had the halo headlights for a while but didn't like the look anymore and I've noticed a lot of people started to get the same one so I wanted to switch it up and I've gotten a lot of compliments.
  3. Bxcliff

    My 2003 GMC Yukon Denali

    I was testing out my new camera and thought she looked pretty good. I bought a second-hand HD hood that I'm waiting to find someone to help me prep for install. Don't ask me why I had to put a mismatched color hood on, it been there for years, and its finally time for it to go :Big Laugh:
  4. Bxcliff

    Low Fuel Pressure/P0300 - 2003 GMC Yukon Denali

    Update: Iv'e done more research and a buddy of mine has a Snap-on scanner that could relearn both the crank and cam position sensors; I'm going to give that a try. What do you think of the fuel trims, @Fless
  5. Bxcliff

    Low Fuel Pressure/P0300 - 2003 GMC Yukon Denali

    So I put together this video of all my fuel trim data in this video, check it out and tell me what y'all think. I recorded it at idle and revved around 2k rpm which is where the CEL will flash for p0300 as shown at the end.
  6. Bxcliff

    Low Fuel Pressure/P0300 - 2003 GMC Yukon Denali

    Not the case with me, I replaced my manifolds and used ARP bolts last year with headers and wrapped them with kevlar heat wrap.
  7. Bxcliff

    Low Fuel Pressure/P0300 - 2003 GMC Yukon Denali

    @Fless @PNW VietVet Thanks guys, I'll give it a shot and keep you guys updated. And I'm sure the lifters are going bad also not just one, I did some research and there was always a ticking sound that got gradually worse. At first, it would go away once the truck was warm but now it sounds like...
  8. Bxcliff

    Low Fuel Pressure/P0300 - 2003 GMC Yukon Denali

    I have and if I'm being honest I know nothing about that type of stuff. I'll borrow a scanner and do some research on reading fuel trims and check it out. What would the fuel trim values need to be for it to be running properly? Also, I had a buddy install my new cats, the truck drives a lot...
  9. Bxcliff

    Low Fuel Pressure/P0300 - 2003 GMC Yukon Denali

    Not at all, it starts right up and it always started the same way for years
  10. Bxcliff

    Low Fuel Pressure/P0300 - 2003 GMC Yukon Denali

    With the key on and engine off, it held at 45 psi and it didn't go down at all
  11. Bxcliff

    Low Fuel Pressure/P0300 - 2003 GMC Yukon Denali

    The needle jumps straight to 45 psi when I put the ignition on and 55 psi when I pull the vacuum line off the FPR and rev it a little. I bought an Acdelco fuel pump, I think the part number was MU1321 but I'm not sure. I kind of wish I had tested the fuel pressure right after I installed it but...
  12. Bxcliff

    Low Fuel Pressure/P0300 - 2003 GMC Yukon Denali

    I've been fighting with a p0300 (multiple cylinder misfire) code for a while so I had recently replaced my intake manifold gasket along with knock sensors w/ new harness, and while my fuel rail was out, I had the injectors cleaned by a professional with new o rings and filter for each one. The...
  13. Bxcliff

    Searching for Catalytic Converters

    I'm 99% sure my cats are clogged in my 2003 GMC Yukon Denali and I'm having trouble trying to find a good replacement for my truck. Some of them don't come as a full Y-pipe while others that are sold with both left and right pipes don't seem to have a way to connect them back similar to OEM...
  14. Bxcliff

    What Rear Diff Do I Have?

    Thanks! I'll take your word for the gasket and buy that one to install, the reviews on it look good.
  15. Bxcliff

    What Rear Diff Do I Have?

    Thanks for your help guys, I never knew about the RPO codes until now. I was looking at the list of all the codes on that website and it's pretty cool. It now makes sense to me why the 6.0 in my truck is called LQ4 :Big Laugh: So if anyone were to ask me what differential/rear-end I have, it...
  16. Bxcliff

    What Rear Diff Do I Have?

    Thanks for the response guys; At first I looked at the diff itself to see if I could find anything but the rust and it just being old I couldn't ID anything. Here's a pic of that RPO sticker you told me about.
  17. Bxcliff

    What Rear Diff Do I Have?

    So I'm planning on doing a well-needed diff fluid change with a new cover in my 2003 GMC Yukon Denali and I wanted to know what specific rear differential do I have. I know its a 10 bolt but I've seen different variations of 10 bolts from older to newer cars regarding the size of something in...
  18. Bxcliff

    P0300 Code On For Years and Years...

    So what I'm thinking now would be to do a smoke test and do some digging around to find a possible leak. If the intake manifold does happen to be cracked I know ill have to replace the whole thing but would it be wise to change out the knock sensors/harness too?
  19. Bxcliff

    P0300 Code On For Years and Years...

    Could that make a sound when I turn the engine off? I've noticed it sounds like a vacuum or air being released whenever I turn the truck off, only if I'm outside the truck using my remote starter or if someone else does it.
  20. Bxcliff

    P0300 Code On For Years and Years...

    So my 2003 GMC Yukon Denali that my family and I had since 2004 w/ 181k miles has had an intermittent CEL for years, actually for as long as I can remember. The thing is, the truck dives totally fine, the engine light comes on only when I take it on a highway (about 60 mph) and it would start...
  21. Bxcliff

    03 Yukon Denali AWD Rough Country Lift Kit?

    Anyone?
  22. Bxcliff

    03 Yukon Denali AWD Rough Country Lift Kit?

    I want to lift my AWD Denali but I was wondering if this kit sold by Rough Country would fit my truck. I have completely removed and deleted the Air ride system on my truck and I'm currently running regular gas shocks all around. Since this kit works with the regular 4WD Yukons/Tahoes, would it...
  23. Bxcliff

    Parking Brake Problems :(

    I just put them next to eachother to see if anything is drastically different but didnt physically measure their length. Sent from my SAMSUNG-SM-J727AZ using Tapatalk
  24. Bxcliff

    Parking Brake Problems :(

    So I just took everything back out and installed it again to make sure I wasn't doing anything wrong and I did. I didnt put one of the cables in its mounting hole on the pedal assembly and on the frame mounted hole. Once I did that, the cable is now too short, figures. It's about an inch and I...
  25. Bxcliff

    Parking Brake Problems :(

    The part number of the cable is BCA660195 and according to Advance Auto, it fits my truck. Other part stores have the same cable but it looks like the same one I just bought. Think I should go to the dealer for this? I usually don't ever go to the dealer for parts.

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