I have 99 Yukon. 5.7L. I just had the intake gasket replaced. The Dealer used a gray sealant. I am not sure what kind. The next day after the gasket replacement work was done I noticed a small drip of oil. It runs down where the engine and the tranny bolt together. I believe it is called the torque converter housing. It comes down the passenger side from around the top of the torque converter housing. It is motor oil for sure. Because of all the plumbing it's hard to see where it starts but I believe it starts near the distributor.

I have only read of one similar leak and it was on a 2003 with the 5.3L motor.

Could this be caused from the intake gasket job not being done right?
If so, do you think the dealer should do the rework at no cost to me. I just got down paying them over $1400 for that and some other things.

The next question I have is how do I fix a hard to open cargo door (barn door)? One of mine is very easy, just like new, while the other is like trying to pry open a campbells soup can. The pins and hinges look good but they surely must be corroded inside. I see no signs of corrossion on the outside. The paint on them is perfect.

Could this be caused from the intake gasket job not being done right?

If it didn't leak before and it leaks now then it probably is the result of something they didn't do right. The leak could be the intake manifold gasket itself, but they would also have had to remove the valve covers which can also leak oil.

Why did the intake manifold gasket need replaced? Just curious because I just bought a '99 myself.

Jim

The intake gasket needed replaced because it leaked coolant. I have looked at Tahoes and Yukons for a while and this occurs on about 1/2 of the ones I spied.

The dealer fixed the leak today. They said the sealant failed to cure around the rear arch of the intake manifold. They also said they pulled the distributor and put a new o-ring on. Before I picked it up they ran it at 2500 rpm for 15 minutes and it didn't show any signs of leaking.

So far things look good. I wish I had a good diagram of the engine. Any recommendations that are better than a Haynes book?

Why can't GM figure out how to design an intake manifold that doesn't leak? My Grand National has a really poor design that leaks oil down the bellhousing because the manifold barely makes contact with the block at the front and back of the engine. They rely on a bead of silicone sealant to seal it. The 3.1L in my Century is known for leaking coolant either inside (bad) or outside (nusiance) of the engine. Mine leaked outside. I can't wait to change the one on the Denali.

Anyhow, you can get the factory service manuals from Helm (Helm.com). You have to poke around the site a bit to get there, but you can buy them directly from the site. These are the manuals the service technicians use. I have a set for every car I've owned - they come in really handy whether you plan to do things yourself or want to understand what the stealer or mechanic is telling you is wrong with your vehicle.

Jim