Quote:
Originally Posted by simonbond
im guessing that if its starved of fuel like you guys say its not going to get hot anyway.
I don't know where the EGR valve, is on the engine, but then again I haven't looked round throughly...
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I wouldn't think so since it gets exhaust gas which is plenty hot. I have had the rear section of a Garret T3/T4 glow in the dark along with the manifold after a hot lap. The front was hot but not glowing.
The EGR valve is just below the 6 way split. See post
here. Also, if you go remove the manifold, I'd take the GPs out also and anti-seize them.
If you are suspecting injectors, I'd forget the snake oil like Diesel Purge or what I call Double Penetration. Take the injectors out and have them tested. That way you will KNOW for sure if it is good. At 172K, I suspect at least one of them is crudded up. I had them out at 100K and 5 were good while one was dirty and needed to be disassembled, cleaned and retested. Total bill for that part of the work? $70. You could spend $200 on DP and not know for sure if the injectors are bad or good. Though you would have a SWAG.
Check the turbo. Take out the front hose and see if you can spin the blades freely. There should be no noticeable drag and you should not be able to wiggle the shaft back and forth. Look around the exhaust manifold all the way to the turbo and see if it is sooty at the joints.
As a last resort, you might disconnect the down pipe and run it BRIEFLY to see if the cat is clogged.