Project 99 Yukon

Plastidipped the badges and fading rubber.


K&N Intake

Gibson Headers With Magnaflow exhaust and 3" tip.



For the mountains... the sleeping and storage platform. This needs some work but it is a starting point. The top shelf extends to just behind the front seat for 75" of platform when the rear seats are folded down.

Welcome from Miami Beach Jon!! Your 99 Yukon looks awesome!! Nice work..All those weekends working on your Yukon paid off.

Thanks Gary. I am proud of what I have done so far with a bit of youtube learning and no past experience. I have a few mechanical things to fix (ie. pay someone to fix the transfer case. I dont want to tackle that) before I head back to the mountains. A lot of the stuff can wait. Once I fix the 4L issue, it will be back to the capable truck that it has always been. Reliability is my main focus and that is why I chose to rehab the truck. Simple, basic Truck. 5.7L. Not too many computers. not too hard to work on and pretty fun to get to the mountains with.

Energy Suspension and Prothane Upgrades

I am not sure which upgrade is my favorite. The Gibson headers and Magnaflow sound amazing. The K&N CAI is great and I think really adds to the system with the new exhaust. The Hypertech programmer is a huge change for firmer shifting and power. I definitely notice that add-on.

But of all, I think the poly upgrades changed the entire dynamics of the truck.

The motor mounts were shot.




New Energy Suspension Motor Mounts with cleaned and painted casings.



Can I tell you what a total PIA that was? Wow!

I think the dealer wanted 700-800 aside and that was ridiculous. So I did the motor mounts, body mounts, transmission mount (all Energy Suspension) and front sway bar bushings (Prothane) and the difference in handling was such a huge improvement. I would always recommend this and except for the motor mounts the job was not that hard.

Looks good. With the bottom plate of the throttle body flapper that black, I would suspect your fuel pressure and spider injectors would need to be replaced. When the fuel regulator goes bad, or the injector lines get brittle and crack, the engine runs rich and probably smokes a little. Its a pretty simple job, but would put you back about $300. It made a huge difference on my 99 Hoe.

bunchz71 said:

Looks good. With the bottom plate of the throttle body flapper that black, I would suspect your fuel pressure and spider injectors would need to be replaced. When the fuel regulator goes bad, or the injector lines get brittle and crack, the engine runs rich and probably smokes a little. Its a pretty simple job, but would put you back about $300. It made a huge difference on my 99 Hoe.

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Thanks for the feedback. After the Dexcool killed my block, I replaced the motor with a crate motor about 40k-50k miles ago in December 2010. Would the mechanics have replaced the spider injectors as part of that? That seems like a big job to lift the top of the motor off to replace that part. I will check the fuel regulator in the morning and see if there is any of the cold start issues like long crank but I dont think I remember any of that in the past. perhaps the build up is from before the engine was R/R'd. Your thoughts?

RED TAHOE LS said:

Jon welcome to the forum from Georgia Dawg country. You mentioned you have not wrenched much in the past, you have done one hell of a job on the Yukon, so keep up the good work. Good luck and keep posting future changes.
David g.....

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Thanks for your support. I have never wrenched before so this is my life experiment to demystify what the mechanics do everyday. My goal was to have a minimum baseline of understanding how this beast works so if I got stuck somewhere, I would have a starting point for troubleshooting and determine if the problem was outside my scope of knowledge. Plus, it is pretty satisfying to fix something on the cheap that might otherwise be an outrageous expense that makes you want to unload the vehicle.

I am finishing some rock sliders, rear bumper and hitchgate. I will get that posted when I am done in the next few days with some pics. My goal for this project was to get some increased departure angle, get the spare tire to a place where I could actually get to it in the event of a problem and carry some spare fuel on the outside of the truck besides on the roof rack. Keep you posted!

My99Yukon said:

Thanks for the feedback. After the Dexcool killed my block, I replaced the motor with a crate motor about 40k-50k miles ago in December 2010. Would the mechanics have replaced the spider injectors as part of that? That seems like a big job to lift the top of the motor off to replace that part. I will check the fuel regulator in the morning and see if there is any of the cold start issues like long crank but I dont think I remember any of that in the past. perhaps the build up is from before the engine was R/R'd. Your thoughts?

Click to expand...

If you replaced the motor with a long block (block with heads and no intake, i would suspect they used the same injectors. Check youtube for changing spider injectors. There are several videos that are very helpful.