What did you do to your NNBS GMT900 Tahoe/Yukon Today?

iamdub

Full Access Member
Joined
Apr 23, 2016
Posts
13,739
Reaction score
23,646
Location
Li'l Weezyana
Dorman "updated" valve cover... leaking after 2 years?

Long story kept long, the ticking from my engine had been slowly getting louder over the years. I knew I had some broken manifold bolts, so I took it to a muffler job to give me an estimate on the job.

While looking the truck over from underneath (and idling), sparkplug #5 was jumping around like it was about to fall out. The tech said "looks like you have a misfire, you should get that sorted out first." I went home and sure enough, plugs #5,7 were both very loose (easily removed with my fingers).

The plugs themselves looked fine but I did note a lot of oil in the area. Turns our my driver's side Dorman valve cover (with the updated baffle design) is leaking. I read around on Amazon and it turns out their gaskets are junk and routinely do this after some time (most posts note 2 years). Heads up for you other guys with this product. I re-torqued my plugs but I am sure the oil dripping on them helped them come out; time to buy the GM part like I should have the first time around!

So, the cover is fine, it's just the gasket that's crap and an OEM one should be used?
 

cfmistry

Full Access Member
Joined
Dec 5, 2018
Posts
249
Reaction score
417
So, the cover is fine, it's just the gasket that's crap and an OEM one should be used?

That is what I read from most reviewers. Some still had leaks with a new FelPro gasket though, so not sure what that’s about. I can tell you my right gasket and cover are original and leak-free at 183k miles though.
 

Rocket Man

Mark
Supporting Member
Joined
Dec 25, 2014
Posts
20,278
Reaction score
35,767
Location
Oregon
Dorman "updated" valve cover... leaking after 2 years?

Long story kept long, the ticking from my engine had been slowly getting louder over the years. I knew I had some broken manifold bolts, so I took it to a muffler shop to give me an estimate on the job.

While looking the truck over from underneath (and idling), sparkplug #5 was jumping around like it was about to fall out. The tech said "looks like you have a misfire, you should get that sorted out first." I went home and sure enough, plugs #5,7 were both very loose (easily removed with my fingers).

The plugs themselves looked fine but I did note a lot of oil in the area. Turns out my driver's side Dorman valve cover (with the updated baffle design) is leaking. I read around on Amazon and it turns out their gaskets are junk and routinely do this after some time (most posts note 2 years). Heads up for you other guys with this product. I re-torqued my plugs but I am sure the oil dripping on them helped them come out; time to buy the GM part like I should have the first time around!
I seriously doubt oil leaking on your plugs could be blamed for them coming loose. Must not have got them tight the first time. Sounds like you got lucky and didn’t get a couple stripped holes. Someone was looking out for you!:)
 
Last edited:

Sparksalot

Supporting Member
Joined
Sep 20, 2020
Posts
1,460
Reaction score
2,784
Location
Texas
Is the hot lead for the front dome light somewhere in this bundle? I’ve been thinking about trying to install a red/white ticket light, and would like to use the harness if I can tap it.

You must be logged in to see this image or video!
 

trailblazer

Full Access Member
Joined
Jan 22, 2019
Posts
248
Reaction score
361
Yes there is a 12v hot and ground there. Use a multimeter and you can stick it in the rear of the connector. Start by doing a continuity check with body ground to find the ground wire in the harness; probably a black or brown wire. Then lol for a +12V accessory or constant depending on what you want. I found a +12V accessory wire to power my 12v to 5v USB adapter that will automatically power on my dash camera. It’s a nice clean install.
 

pwtr02ss

Full Access Member
Joined
Apr 1, 2013
Posts
5,253
Reaction score
6,862
Location
Tennessee
Got gas on my way to get groceries. E85 still $2.09 gallon [emoji847]

Sent from my SM-G930V using Tapatalk

I know this is 07-14 section but does anyone know if a 2019 Yukon Denali is flex fuel? My avalanche has a yellow gas cap. Has a badge on the tailgate as well. My Denali has no gas cap and doesn't say anything that I've noticed. Guessing not
 

Forum statistics

Threads
113,145
Posts
1,538,056
Members
69,788
Latest member
kandersn317
Top