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Old 12-27-2004, 07:31   #1 (permalink)
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exhaust heating up on f350

I have the f350 utility body with the 351 windsor 2x4. The exhaust between the cat and the muffler is getting red hot, the muffler and pipes going out back are all new. Does this mean that the cat is backed up? Its getting hot after the cat so im thinking it may be something different, any help would be greatly appreciated.
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Old 12-27-2004, 15:24   #2 (permalink)
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Re: exhaust heating up on f350

i had a cat that would glow on my old falcon ute, a short while after the car started backfiring and i had to get it replaces coz it was stuffed.

is it actually glowing or is it just smelling really hot? it may just be the new paint burning off the new exhaust pipe

see what the exhaust shop says.
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Old 12-27-2004, 20:50   #3 (permalink)
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Re: exhaust heating up on f350

The cat is flat LOL give it the flik, high load vehicles shite the cat more often than passenger cars, changed quite a few on heavily loaded XH's etc WOT for too long stuffs em specially on GAS (shudder)
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Old 12-28-2004, 05:40   #4 (permalink)
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Re: exhaust heating up on f350

When the cats get red hot it means either a
1. The cat is stuffed
or
2. You have unburnt fuel going out the exhaust where is gets trapped in the catalyst and burns when the catalytic converter heats up - in which case you can now look back to dot point 1.
I would start checking your air/fuel ratios before you put another cat in there.
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Old 12-29-2004, 01:32   #5 (permalink)
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Re: exhaust heating up on f350

Yep timing retarded and/or fuel mixture
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Old 12-29-2004, 14:47   #6 (permalink)
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Re: exhaust heating up on f350

ok quick update, I gutted the cat then re-installed, BUT I also found a broken vacuum line that I fixed. The truck runs like a top now, but I'm not sure if its completely because of the cat cleared or the vacuum line being fixed.
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Old 12-29-2004, 15:05   #7 (permalink)
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Re: exhaust heating up on f350

was it the vacuum line for the distributer?
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Old 12-30-2004, 15:23   #8 (permalink)
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Re: exhaust heating up on f350

looked like it was going to the throttle body.
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Old 12-30-2004, 19:51   #9 (permalink)
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Re: exhaust heating up on f350

Map sensered I suspect ?? Yep too rich...
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