North American Turbocoupe Organization

Catalytic converter
TCtbird88 Offline
Junior Member
Wondering if anyone would no why my catalytic converter would be smokingvlike crazy after shut off and sometimes while sitting at a light? In thinking it's bad and was thinking of deleting it and not running one at all. I need to have the exhaust fixed from ripping one muffler off on a speed bump

Pete D Offline
Could be a problem with the converter. Are you sure it's not an oil leak is not getting on it?
Pete Dunham


Jeff K Offline
If the converter is producing smoke off of its outside surface, something like oil is getting on it and burning as Pete suggested. Cats run very hot..... around 1500 deg F, and anything that gets on the cat exterior will burn off.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
11 Crown Vic Interceptor
14 Toyota Camry (wifes car)
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized

anasazi4st Offline
Senior Member
Yes plastic grocery (shopping) bags are notorious for this. I try and avoid these whenever possible on the freeway/highway, as I see them floating around.
Another proud dues-paying member.

1987 Turbo Coupe w/T5OD, 8.8 axle, grey smoke; most options. Got it in 1991 with 41K miles: 3 turbos, 2 heater cores, 3 T5OD full rebuilds, 6 clutches, 1 head gasket, 2 Teves II ABS units, etc. later....

TCtbird88 Offline
Junior Member
I think oil is getting on the cat. I just pick up a pretty nice 88 automatic TC and it does the same thing. I'm thinking that the tail shaft seal is leaking on bothe transmissions. I haven't really gone under to really investigate but I need to. That cat is directly under the trans tail shaft from what I can see just looking under the car. That's why I'm guessing it's the tail shaft.

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