intermittent spn 0102 fmi 18 cm871

[jgriffin812]

I had some small leaks at the CAC boots, those were replaced, no more leaks there. i changed the imap sensor about a month ago when the problem started. I recently, after the code popped up, had the exhaust manifold off to change out 2 broken bolts on cylinder 1. My thought was i was loosing pressure before the turbo so it had low boost. not the case same problem after, but at least I have no broken manifold bolts and i was able to drill out and tap the egt sensor with the manifold off to make sure it was clean and also blow through the back pressure tube that was clear. when the code is active I have boost at idle so it makes it easier to check for leaks, when I spray the CAC itself with my soap water mix i cant see any bubbles. I've sprayed the soapy water around the egr crossover as best as I can but access is limited. thanks again.