: 94 deville concours northstar catalytic converter redhot and stalls



jim stiles
01-10-12, 03:08 AM
My caddy is having issues when you start it its ok untill it warms up then idles rough, stalls and the cat is glowing? I checked the codes and its saying map sensor. I replaced the the map sensor the idle control valve, tps sensor, catalytic converter and have no clue what it could be any ideas of the problem would be appreciated. Thanks !!

ternstes
01-10-12, 08:03 AM
You are getting too much fuel into the cat converter. How old are your spark plugs?

Ranger
01-10-12, 12:17 PM
Check for a leaky FPR. You are dumping raw fuel into the CAT. If it is not dead yet it soon will be.

94CaddyConcours
01-10-12, 08:27 PM
It could also be that his ignition coil doesn't work which dump raw fuel into the CAT. The cat then would burn any raw fuel. Shouldn't replace the CAT like Ranger says until the issue is resolve. CAT was the effect not the cause