White exhaust manifold

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Author Message   Daniel McElroy (Danielm60660) New Member Username: Danielm60660 Post Number: 37 Registered: 05-2003 Posted on Tuesday, August 19, 2003 - 11:00 am:    What does it mean when one exhaust manifold is much whiter in color than the other, besides the fact that one is getting hotter? (driver's side on a 98 Disco) Been told to watch for stopped up cat on the effected side. Make sense? Thanks, -D   Alex Cabrera (Alexcabrera) Member Username: Alexcabrera Post Number: 131 Registered: 12-2002 Posted on Tuesday, August 19, 2003 - 06:52 pm:    Do you hear any rattling when car is idle? That's how my cats sounded when the matrix stuff got loose after a while. What's the mileage also... head issues?? Valves??   Daniel McElroy (Danielm60660) New Member Username: Danielm60660 Post Number: 38 Registered: 05-2003 Posted on Sunday, August 24, 2003 - 12:01 am:    Alex, I tapped on the cats they sound the same on both sides. No rattling at idle. I have 107k.   Will Cupp (W_cupp) Member Username: W_cupp Post Number: 47 Registered: 07-2003 Posted on Monday, August 25, 2003 - 11:34 am:    My truck looks the same way. My cats seem fine, but how can you tell. Will the check engine light come on after a while. Seems like the O2 sensor would notice a problem.