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Just threw a P420, bank 2 cat. Time for headers! or at least some MIL eliminators and maybe a "clearing" of the cats 
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Originally posted by rkneeshaw3.0:
Just threw a P420, bank 2 cat. or at least some MIL eliminators and maybe a "clearing" of the cats
P0420 is Bank 1 (next to firewall).
In addition, if Michigan has smog emission tests, it might be a good idea not to gut the pre-cats. I just installed the Mileliminators and left the pre-cats alone. Will know in May 2006 if it will pass emissions in Northern VA.
Last edited by Tony2005; 09/21/05 03:34 PM.
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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assuming a healthy cat, gutted precats won't affect inspection. Precats are used on a colder engine.. the CAT on warm engines.
Make sure your engine is fully warm and you'll be fine.
Californians have passed their rigorous inspections with gutted precats...
Ray
'99 CSVT - Silver #222/276
In a constant state of blow-off euphoria.
Originally posted by Kremitthefrog:
I like to wear dresses and use binoculars to watch grandmas across the street.
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Originally posted by Ray:
.... assuming a healthy cat............, gutted precats won't affect inspection.
Emphasis on "assuming a healthy cat". 
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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I have no life
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I have no life
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We have no emissions in MI.
-'96 SE MTX 3L
-'98 SVT 1,173 of 6,535
-'05 Mazda 6s, loaded, g/f's ride
-Need a 96-00 manual on CD? PM or email me
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Originally posted by todras:
We have no emissions in MI.
Lucky devils. 
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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I saw a TSB when researching this problem. It appears that in some instances tha CAT may not be bad; the PCM may need to be reprogrammed. My DTC cleared up without doing anything.
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Originally posted by NKENN:
I saw a TSB when researching this problem. It appears that in some instances tha CAT may not be bad; the PCM may need to be reprogrammed. My DTC cleared up without doing anything.
The pre-cat could be going bad. The TSB just advises the reprogramming of the PCM to widen the band (limits) so that the CEL is not lighted up as early. Your DTC clearing up could be a different issue(as could his).
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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i think the precats are useless and stupid , headers and y-piped and high flow cat will do its justice,
do ford cars work soo bad that they had to have like 5 cats on them , dont early 90 mustangs have like 4 catts or somthign liek that ?
sorry thats my Opinion didnt mean to start anything
1997 30th Anniversary SS,Jethotts/ORY/GMMG, 160thermo, ,TB bypass, 1LE intake elbow, BMR STB, 32mmswaybar..21mm rear,BMR LCAs, PR,SFCs,TA,LT4 KM,255lph, shift kit
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Originally posted by bobbyd:
i think the precats are useless and stupid , headers and y-piped and high flow cat will do its justice,
do ford cars work soo bad that they had to have like 5 cats on them , dont early 90 mustangs have like 4 catts or somthign liek that ?
sorry thats my Opinion didnt mean to start anything
You're right for the most part. The pre-cats are used to reduce cold-start emissions. When you first turn on your car your main cat doesnt heat up as fast as the pre-cats.
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