So interesting story. A van was driving in front of me yesterday, and half- yes half- of it's exhaust fell off..on the highway. It came off, bounced under my car, tore a hole in my Cobb downpipe, and busted a flange on my GReddy Evo 2 exhaust right before the muffler.
Needless to say, the car ran kinda rich until I got home to cut out the damaged downpipe section and re-weld in some more piping. But, i'm still running rich. And now I'm confused. While cruising, my car is anywhere between 13:7 to 14:4 AFR's. It's normally in the ideal range of high 14's, low 15's just cruising.
I'm running out of ideas as to why it's running rich still? I'm not throwing a CEL, and I can't SEE any cracks in the compressor housing ( that doesn't mean they aren't there I suppose..). I can hear a faint whistle from the motor, but given this incident, it's hard to decide whether or not it's just my itty bitty td04 spooling up, or if it's leaking.
Is it possible that A. The turbo cracked? B. The up-pipe got knocked loose? or C. I have an exhaust manifold leak? Would any of these things cause my rich condition? I didn't see any scrapes or marks on anything besides a crossmember and of course the gaping Titanic-like wound in my poor downpipe. Ideas? Thanks!