Jim Warman Posted November 8, 2008 Share Posted November 8, 2008 Well, gents, I've got one here where I can't see the forest because too many trees are blocking the view.... this is one of my three amigos.... About an 06 with a recent "trifecta" (head gaskets, EGR cooler, oil cooler)... and a recurring P0299, P1408 and P2263 in the KOER test. They key to the thing is that it appears that it can't build any backpressure (but it makes 25~26 PSI boost on a road test). Smoke test shows that no exhaust or intake leaks are left... air management test shows EBP is too low but sensor coherency passes... I had him remove the EBP tube and make sure it was clear - gave it a new EBP at the same time. Did the VVT test (I'm going to repeat it tomorrow to look for some considerations I may have overlooked) and it looked good at the time... you could hear things cycling up and down.... IAT2 didn't change when the EGR was commanded open at first - cleaned the sensor and now that works. Had him pull the turbo.... unison ring, etc. all looks and moves good.... Tried a known good EGR valve - no change... Warm idle, I have barely 15 PSI EBP with the VGT pinned at 85%. And the question bears asking - how many of these have we seen with exhaust leaks and no codes? And all I'm looking for is one or two more PSI.... Quote Link to comment Share on other sites More sharing options...
GregH Posted November 8, 2008 Share Posted November 8, 2008 What boost does the VVT test generate? I've seen sick trucks make 1psi or less when warm, where healthy trucks can make 2 to 2.5psi. Does it have a catalytic convertor? If so, is the casing gutted out? Quote Link to comment Share on other sites More sharing options...
Jim Warman Posted November 9, 2008 Author Share Posted November 9, 2008 The tech didn't have things back together Saturday so there was no opportunity to rerun the VVT test.... As I recall, the highest reading I saw was 0.25 PSI boost. But I really do need to rerun the test to consider some possible oversights on my part... if only I had thought to take a couple of screenshots. Tapping the cat with a small hammer "sounds" like it is intact... But we have had trucks through with cat deletes and don't display this concern. Quote Link to comment Share on other sites More sharing options...
2006 Posted November 10, 2008 Share Posted November 10, 2008 I would check the egr o rings for being cut first. If thats ok, reinstall the egr valve but leave it disconnected. Run the engine and then block off the tailpipe with your foot and get someone to watch the ebp pid. If the pid does not increase, I would suspect a exhaust leak somewhere Quote Link to comment Share on other sites More sharing options...
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