Wondering if I can remove the cats and computer
#17
11-14-2007, 03:24 PM
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Originally Posted by Radio
I gutted my cats on my 95 5.0 and had some serious fuel efficiency increases just clicky on my signature.
I read your post. I can't figure out what your mileage actually is now. I think we've got the same set up. 302, 5 spd. I've still got the stock 3.55 ratio. What do you think you get per gallon, just normal driving around. Also, have you got the stock manifolds still on or headers?
#18
11-14-2007, 06:16 PM
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Originally Posted by selbona
Alright, so I'm stuck with the EFI and the computer unless I want to completley gut my truck and start over. So, if I cut the cats off, does anyone know what will happen to the sensor readings in the computer? I guess it's going to throw a code, but what, if anything, can I do to bypass it?
If your cats are functioning properly, do not expect to see any MPG gains by removing them. If they are clogged, that's a different matter.
#19
11-14-2007, 08:13 PM
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#20
11-14-2007, 11:09 PM
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Not true.
With or without cats, the EFI system requires that ALL upstream HEGO sensors remain functional. On 96-up vehicles with OBD-II there is a downstream HEGO sensor between the cats and the muffler. If you gut the cats on an OBD-II vehicle you must install a MIL-eliminator on the downstream sensor. The upstream sensors MUST remain functional regardless of OBD-II or not.
With or without cats, the EFI system requires that ALL upstream HEGO sensors remain functional. On 96-up vehicles with OBD-II there is a downstream HEGO sensor between the cats and the muffler. If you gut the cats on an OBD-II vehicle you must install a MIL-eliminator on the downstream sensor. The upstream sensors MUST remain functional regardless of OBD-II or not.
#21
11-14-2007, 11:25 PM
Originally Posted by StrangeRanger
Not true.
With or without cats, the EFI system requires that ALL upstream HEGO sensors remain functional. On 96-up vehicles with OBD-II there is a downstream HEGO sensor between the cats and the muffler. If you gut the cats on an OBD-II vehicle you must install a MIL-eliminator on the downstream sensor. The upstream sensors MUST remain functional regardless of OBD-II or not.
With or without cats, the EFI system requires that ALL upstream HEGO sensors remain functional. On 96-up vehicles with OBD-II there is a downstream HEGO sensor between the cats and the muffler. If you gut the cats on an OBD-II vehicle you must install a MIL-eliminator on the downstream sensor. The upstream sensors MUST remain functional regardless of OBD-II or not.
#24
11-15-2007, 10:38 PM
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#25
11-15-2007, 11:14 PM
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#26
11-20-2007, 02:46 AM
Originally Posted by selbona
I read your post. I can't figure out what your mileage actually is now. I think we've got the same set up. 302, 5 spd. I've still got the stock 3.55 ratio. What do you think you get per gallon, just normal driving around. Also, have you got the stock manifolds still on or headers?
stock manifolds
3.31 ratio differential
Last edited by Radio; 11-20-2007 at 02:49 AM.
#27
06-09-2012, 01:20 AM
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#29
06-09-2012, 09:32 AM
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#30
06-09-2012, 11:37 PM
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