Cherry red y pipe
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New User
Joined: May 2004
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Cherry red y pipe
I just bought a used 97 f150,was told it needed cats. Replaced them and the y pipe still glows cherry red. disconnected muffler still the same.also I have hardly any throttle response.Any help would be appreciated(4.2 V6)
Hotshot
Joined: Aug 2002
Posts: 12,679
Likes: 15
From: BC, Canada
Hi moe67 and welcome aboard 
I would start by taking the truck and getting it scanned for codes. Not just memory codes, like Autozone checks for, but engine running codes too. A good scan tool will let the tech watch live data and he might be able to see a problem such as a bad MAF sensor or whatever.
I would also have the fuel pressure and ignition timing checked. Neither is adjustable but both have to be right.
I would start by taking the truck and getting it scanned for codes. Not just memory codes, like Autozone checks for, but engine running codes too. A good scan tool will let the tech watch live data and he might be able to see a problem such as a bad MAF sensor or whatever.
I would also have the fuel pressure and ignition timing checked. Neither is adjustable but both have to be right.
