94 deville concours northstar catalytic converter redhot and stalls
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Northstar Engines and System Technical Discussion Discussion, 94 deville concours northstar catalytic converter redhot and stalls in Cadillac Engine Technical Discussion; My caddy is having issues when you start it its ok untill it warms up then idles rough, stalls and ...
  1. #1
    jim stiles is offline Cadillac Owners Member
    Automobile(s): 94 Deville Concours
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    94 deville concours northstar catalytic converter redhot and stalls

    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 !!

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  3. #2
    ternstes is offline Cadillac Owners Fanatic
    Automobile(s): 2011 CTS V, 2007 SRX V8, 2005 CTS 3.6L, 2000 STS, 1999 STS
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    Re: 94 deville concours northstar catalytic converter redhot and stalls

    You are getting too much fuel into the cat converter. How old are your spark plugs?

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
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    Re: 94 deville concours northstar catalytic converter redhot and stalls

    Check for a leaky FPR. You are dumping raw fuel into the CAT. If it is not dead yet it soon will be.

  5. #4
    94CaddyConcours's Avatar
    94CaddyConcours is offline Cadillac Owners Fanatic
    Automobile(s): 1994 CADILLAC DEVILLE CONCOURS, 350ZR
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    Re: 94 deville concours northstar catalytic converter redhot and stalls

    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

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