cmp189ap

i have a 91 ford F-350 with a 460....friday it lost a lot of power and than started to idle like crap. i could not move the throttle much and than it would bog out and kick air back in to the air box.... i cant get the thing to start now and i have tryed everything. someone i worked with told me t could be the cat that might have taken a crap. could one that went bad really stop me from starting my eng??

cmp189ap

yes a bad catalytic converter can stop your truck from starting. 460's are pretty loud with no exhaust.

360ci

If you have the proper tools or know someone who does you can 'gut the cat'. Which is taking the crap out of the cat and then reinstalling it - or a straight pipe until your next emissions check is due will be the way to go so you can save up some $ for a new cat. Inside it's mostly a honeycomb mesh that absorbs particles to reduce tail pipe emissions.

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'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!

JOAT

perhaps you should check if the timing is still correct... if you have lots of miles on the motor, the timing chain may be worn and loose . This causes the chain to skip over a tooth or two and the timing sprockets no longer align ... lack of power and almost impossible to keep running at low speeds .... giving backfires thru the intake and eventually skipping enough teeth to bend the valves as they now contact the pistons and a no start condition.