So I've been putting off asking for a long time because it seems like this will be hard to diagnose remotely but I thought someone might have some insight.

It certainly does seem like I have an exhaust leak under-hood. Exhaust in when the HVAC is on vent. One time I had a failed start that ended in a bunch of smoke coming out from under the hood. At first I thought something had caught fire and I was preparing to loose the truck - When I poped the hood it was jsut diesel smoke. I've had my hands all over the Turbo/Downpipe couple and it does not appear to be coming from there. I really don't seem to hear any exhaust leak. Does anyone care to guess where this may be coming from. I also checked all-over the Passenger manifold but it seems like the Driver manifold is harder to get near.

The Amount of Smoke under the hood on that one failed start seems odd - I've never noticed smoke from under the hood on any other smokey start but I suppose that may be because of the fan running.

 

look for black soot that will tell you where its leaking. mainfold to block, turbo up pipes or exhaust inlet for turbo. a flashlight and inspection mirror will help look at the those hard to get to spots.

 

I am having the exact same problem.....the problem is bad en enough that I don't use my truck anymore.....cause it smells of diesel for days on my clothes....I was told to look at manifolds, turbo...and EBPV....but here in the Yukon...it's about -5 degrees F....and I don't have a shop....no way I'm going to work in that cold.


Yukonsly

 

I have to admit that my problem doesn't sound as bad as your's. I am willing to let it sit at a light with the heat on and you can certainly smell exhaust but even still you can't smell it on your clothes afterwards. On the highway it's a non issue. I wonder if you might not have a fuel leak?

 

Nope...post combustion smell....and I could see the smoke come off the engine, just like you....actually I still drive it....but I would rather not...will need to get it looked at soon....


Yukonsly

 

Odds are it is your turbo up pipes, one or both. Those things are notorious for leaking, and they are an awful design. There is a company out there that is making a replacement version that eliminates the leaky joints, but for some reason I misplaced the link. Kwik in the supderduty forum has it though i think. Last time i looked, they only had prototypes and weren't ready for production, but that was 6 months ago so they may be ready now.

 

Found my leak....I started the truck this morning....with the hood opened....hahaha as not to asphixiate myself....smoke was coming from where the Downpipe meets up with the turbo....Clamp I guess....or could it be something more serious?

Yukonsly

 

I think that's the easy one... at least it's very accessible. I was driving with the windows down today and finnaly heard mine so at least I know it's there. It must be on the Drviers Manifold.