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2004 to 2008 F-150 and Mark-LT
4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs.


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Old Tue, August 4th, 2009, 08:34 PM
Sburn Sburn is offline
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Quote:
Originally Posted by JackandJanet View Post
I wonder though, how much difference flex/non-flex fuel is, and, 49/50 state differences seem like they should be minimal too.

- Jack
Functionally, I suspect there’s little to no change between those two flavors. Maybe labeling is done that way to satisfy some regulatory requirement or to be able to prove something to the EPA (flex) or CARB (50-state).

I know as a Kalifornia resident, I can't go out-of-state to buy a new car and bring it back here unless it's 50-state certified on the VECI label. I imagine a 49-state label could easily come unglued and somehow a 50-state label might get put in its place, leaving the PCM calibration as the only true way to tell the 49/50-state status.

http://www.dmv.ca.gov/pubs/brochures...cts/ffvr29.htm


Back in the 70's-80's California cars did have some actual hardware differences that were unique to our Golden State. NOx (nitrogen oxides) valves in the distributor vacuum lines, I think it was. Maybe cats and EVAP stuff too before the rest of the country got them. I don't think there's been any actual hardware differences between CA and the other 49 states in a while now. But that's all fixing to change again when CA goes to their own CO2 standard.
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Old Tue, August 4th, 2009, 09:54 PM
dnkrm dnkrm is offline
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Tonight I ran to the golf course and watched it closely. Had the same symptoms as soon as I took off, it would shift way too early, I was in third gear at like 30 mph and as I slowed down again it would not shift back down until I slowed to a stop and then it would finally shift down and I would feel it shudder as I came to a stop. So, now I am really concerned this deal is not going to clear up and I am going to have to fix my truck just out of warranty, just my luck. Not to mention if it was one year newer I would still be under the powertrain warranty. Anyone have anymore ideas? thanks
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