Quote:
Originally Posted by nicholas
I cannot see where the exhaust gas has been spewing from exactly, but my best guess would be somewhere near the EGR valve where it screws into the round pipe (not where it bolts onto the intake manifold).
I've been looking over the FSM and it looks like the exhaust could still spew from the EGR unless it is completely removed and capped.
Is that true or will capping the vacuum lines that go to the TB prevent exhaust gasses from being sucked up into the EGR?
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From what I've lived through, the most likely culprit is going to be the stem off of the EGR valve (DS space ship) that points to a little L shaped hose on the bottom of the EGR modulator valve (PS space ship) and puts exhaust pressure under it.
This is the point where mine failed twice. On a SC engine with old stock exhaust and clogged catalytic converter, the back pressure was too much for that little L shaped hose to either stay on the modulator valve (my meltdown documented in the link) or even to split the L hose itself.
As a temporary fix to stop the blazing gases coming through, inspect the L shaped tube. I replaced mine temporarily (while waiting to get parts and change out the exhaust system) with a 3" piece of super heavy duty high temp 1/4" ID 1/2" OD hose. One end I clamped -tight- to the EGR stem. The other I put a 1" long 1/4" bolt in and clamped down as well.
Now, how your gases got back behind the EGR to the main wiring harness... don't know. Mine hit my SC wiring harness that we had strung back behind the EGR setup.
Keep us updated. A picture of where your harness melted would help out a bit in pinpointing the leak too.