CATALYTIC CONVERTER or PROGRAMMER
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Senior User
Joined: Aug 2008
Posts: 278
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From: Bethlehem, PA
CATALYTIC CONVERTER or PROGRAMMER
I have an X3 SCT tune installed in my '05 5.4. I have had it installed for about a year now. A couple of months ago Mike (from 5 Star Tuning) and I started changing somethings with my econo tune and everything was great. I was getting between 14.5 and 15.5 mpg. In the last month it slowly started dropping all the way down to 12 mpg. nothing has changed; warm up time, ethenol mix, drive situation, etc... I just noticed today when I got back from a short trip and pulled into the garage I smelled the catalytic converter smell pretty bad, which I have never smelled before. Truck only has 35,000 miles on it. QUESTION.....Is it normal for a converter to go this early in life, Or do you think the programmer has gone on the blink or caused damaged to the converter? I wanted to see what you guys think before I called Mike.
Sick 'n Tired
Joined: May 2006
Posts: 2,969
Likes: 47
From: League City, TX
The cats should last the life of the truck. They only go bad early if unburnt gas from misfire is causing them to melt. You should see if you have any codes. If they're going bad you should get a cat insufficiency code.
Either way, it could be bad plugs or stuck injectors.
Either way, it could be bad plugs or stuck injectors.
Sick 'n Tired
Joined: May 2006
Posts: 2,969
Likes: 47
From: League City, TX
It's also worth noting the cats are on national back-order. Some on here have reported waiting several months for their dealers to get them in stock.
Senior User
Joined: Dec 2007
Posts: 162
Likes: 0
I have an X3 SCT tune installed in my '05 5.4. I have had it installed for about a year now. A couple of months ago Mike (from 5 Star Tuning) and I started changing somethings with my econo tune and everything was great. I was getting between 14.5 and 15.5 mpg. In the last month it slowly started dropping all the way down to 12 mpg. nothing has changed; warm up time, ethenol mix, drive situation, etc... I just noticed today when I got back from a short trip and pulled into the garage I smelled the catalytic converter smell pretty bad, which I have never smelled before. Truck only has 35,000 miles on it. QUESTION.....Is it normal for a converter to go this early in life, Or do you think the programmer has gone on the blink or caused damaged to the converter? I wanted to see what you guys think before I called Mike.
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Senior User
Joined: Aug 2008
Posts: 278
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From: Bethlehem, PA
No, The winter blend around here is the same 10% ethanol mix that the stations serve in the summer, Unless there is something else I dont know about. I am just trying to figure out why my mileage dropped off over the past couple of months. I am going to contact Mike at 5 Star, But I dont know what he is going to tell me because I am running the same program.
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