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4.6L General Discussion This section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.

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Old 08-24-2012, 04:59 PM   #1
GT fireman
 
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Default CATALYTIC CONVERTER, is it necessary?

Just recently purchased a used '05 GT 4.6 w/manual shift, having occasional missfire issues, took it to a local ford dealer for a computer check. Along with a couple of other issues that were found as to why this GT sat on a car lot for so long I was told that the CATs had been blown out. Question is to some of you that have been around, " are catalytic converters even necessary or should I replace them ". Running MSD coil packes and violator exhaust system.
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Old 08-24-2012, 05:04 PM   #2
03gt04mach1
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If you have Emissons Inspections in your area, then yes. If not, you just have to fool the Computer.
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Old 08-24-2012, 05:12 PM   #3
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Also keep in mind the warranty for cats is federally regulated for 80,000 miles. So you have low miles ford has to fix that mess.
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Old 08-25-2012, 06:52 AM   #4
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Quote:
Originally Posted by Seabee1993 View Post
Also keep in mind the warranty for cats is federally regulated for 80,000 miles. So you have low miles ford has to fix that mess.
Not if someone deliberately beat out the cores.

One other comment though, in most states it is illegal for a licensed dealer (new or used) to sell a vehicle that has defective emission control components. Unless it was sold "as-is" the dealer has to either fix it or take it back...
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Old 08-25-2012, 06:52 AM
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