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I cleaned up that area of the motor as best as I could. I then put 9PSI of pressure into the exhaust and looked for leaks. in the EBP tube. I couldn't find any. I listened, felt for air flow where I could and used soapy water.
The engine was pretty messy when I got it, so now I'm chalking that "find" up to a missed spot on previous cleanings.
I'm too chicken to remove the tube to inspect it because it is so rusty at the manifold. I'll wait until I can stand some down time before attempting to take it off.
I've got about a thousand miles of towing to do over the next couple of weeks. I assume that if there is a leak in the tube at the spot where I found the soot, that it will present itself again.
I'm sure it will, I guess just keep cleaning up until you start your trips so you'll have clear indicators where the leaks are once you're done towing.
How are you getting such awesome pics? Good hardware there, and very helpful.
Most are cell phone with a flash. Sometimes I tape it to a stick or something slightly flexible to get it to where I want it.
I also have the phone set to take the photo on voice command.
Originally Posted by aawlberninf350
Based on the EBP chart above the tube won't leak until over 30 psi or so. In your shoes with a trip soon I'd just replace it.
I fear a huge project because of the rust at the manifold. Otherwise I'd just do it. After 350 miles of towing, there are no soot marks where I found that one.
The driver side cac tube at the cooler has oil on it. I just cleaned it before the towing trip. I'm just going to replace that now since it's a likely candidate. I did leak test it with soapy water so I don't think it's simply a loose clamp.
Does anyone have the OEM numbmer for that tube (blue tube driver side at intercooler - just above power steering box)?
I have pressure tested and sprayed the EBP tube in the recent past. Lately, I've been on a oil (intake side) and soot (exhaust side) hunt with the camera in places that are hard to see.
I found this, which I will investigate further:
It also appears that it might be getting a little damp there:
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I can't say for sure. The truck was pretty dirty when I bought it. That could be a spot that just never got cleaned up or a leak. I cleaned it up and towed ~350 miles and that area is staying clean so far.
Originally Posted by Tugly
I should point out that I doubt this is an exhaust leak. I'm convinced something is going on with the intake side.
I have a light coating of oil on the driver side CAC tube at the cooler. I did bubble test there, so I doubt it's the clamps. I don't see any oil on the plastic cooler fitting or the aluminum pipe. I would expect that if it was the clams the oil would be blown onto this areas....
I'm wondering if a hole that can't be seen when inspecting could expand under pressure to be a problem?
17-18 PSI boost is the norm at WOT, but capping the red line can deliver as much as 22 PSI boost on a stock truck - I've done it and I've seen it on other stock trucks. His red line is capped and he's getting 15 PSI boost... somewhat anemic.
I'm not sure. We've been tying the EBP swings to the low boost and have been focused on a leak. Also the ability to hit 1250 EGT on a stock truck seemed to point to a leak.
Is there some specific test I can do to check the turbo?
I have a light coating of oil on the driver side CAC tube at the cooler. I did bubble test there, so I doubt it's the clamps. I don't see any oil on the plastic cooler fitting or the aluminum pipe. I would expect that if it was the clams the oil would be blown onto this areas....
I'm wondering if a hole that can't be seen when inspecting could expand under pressure to be a problem?
Those CAC connections always seep a bit of oil. The traditional fix is to re-route the CCV gasses away from the intake to atmosphere, or through an oil separator. But if you get all the surfaces really clean and use a sealer like hairspray before slipping it all together you may be able to keep it dry. That's just cosmetics tho.
My suspicion was the EBP tube was leaking when it goes over 30 psi or so. Testing it at less than that will not reveal anything. But towing is a great real world test, so if that soot stain doesn't come back I'd cross it off the list.
I thought it was strange that just the blue tube seemed to have a misting of oil on it. If it was spraying a little from the connection, it seems like it wouldn't be all over the blue tube, more near the ends.
Although, one of the photos did show some on the end - since it's on the bottom, it could have come from there or it could have pooled there.
Oil sheen on the tube:
Maybe some made it to the sheet metal (I think this is by the battery - but I'm not positive).
The only oil found at the clamp, but the insulation on the pipe **seems** dry.
How hot does this pipe get?
Can I tie some paper towels around it with a string and see if I get a wet spot?
