460 sputters?
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460 sputters?
1996 E-350 one ton extended high top conversion. Seems to sputter with mid to upper throttle, and maybe when it is slightly above middle on the temp gauge. Could it be that the fuel mix is lean at that temp? Would a one level cooler thermostat cure the sputter, and if so will gas mileage suffer (getting 11mpg geared 4.10)?
Almost everything is new; Jasper reman, new dist., new O2 sensor, map sensor. Ran the same way before all the new stuff.
Someone else told me of a similar problem with an F-250. Is this the nature of the beast?
Almost everything is new; Jasper reman, new dist., new O2 sensor, map sensor. Ran the same way before all the new stuff.
Someone else told me of a similar problem with an F-250. Is this the nature of the beast?
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Joined: Mar 2001
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From: So Cal
Have you changed the fuel filter in the past? These slowly clog over time to where you don't really notice the change until it is bad, like sputtering etc.
My truck went to I think 60 or 70K miles before I thought to change the filter. I THINK the symtpom that was the tip off was ... My truck would stumble badly when I switched tanks. It got so bad that it stalled in an intersection once and that was the strraw that broke the camels back. I replaced the fuel filter and the stumble went a way and the truck ran way better.
Maybe not your problem, but it is something most of us ignore. They should be changed every 30K I think I read.
Good Luck,
Jim Henderson
My truck went to I think 60 or 70K miles before I thought to change the filter. I THINK the symtpom that was the tip off was ... My truck would stumble badly when I switched tanks. It got so bad that it stalled in an intersection once and that was the strraw that broke the camels back. I replaced the fuel filter and the stumble went a way and the truck ran way better.
Maybe not your problem, but it is something most of us ignore. They should be changed every 30K I think I read.
Good Luck,
Jim Henderson
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Originally Posted by jim henderson
Have you changed the fuel filter in the past? These slowly clog over time to where you don't really notice the change until it is bad, like sputtering etc.
My truck went to I think 60 or 70K miles before I thought to change the filter. I THINK the symtpom that was the tip off was ... My truck would stumble badly when I switched tanks. It got so bad that it stalled in an intersection once and that was the strraw that broke the camels back. I replaced the fuel filter and the stumble went a way and the truck ran way better.
Maybe not your problem, but it is something most of us ignore. They should be changed every 30K I think I read.
Good Luck,
Jim Henderson
My truck went to I think 60 or 70K miles before I thought to change the filter. I THINK the symtpom that was the tip off was ... My truck would stumble badly when I switched tanks. It got so bad that it stalled in an intersection once and that was the strraw that broke the camels back. I replaced the fuel filter and the stumble went a way and the truck ran way better.
Maybe not your problem, but it is something most of us ignore. They should be changed every 30K I think I read.
Good Luck,
Jim Henderson
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I would not replace the thermostat with a low range unit. I did that and the ECM thought the engine had just started and wasn't warmed up. I screwed up the emissions and made the engine run rich. Remember, O2 sensor input is top dog; then engine temp; then... Went back to a 192 degree unit and the engine runs better and the emissions went back to where it was orginally.
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Joined: Apr 2001
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From: Eustis FL
Originally Posted by Jay Rhodes
Thanks, but, it was changed before and after the Jasper transplant 10K miles ago. I really think it is programmed this way for maximum fuel economy/emissions or something. Just annoying when it runs 'jittery'.
Also, do you notice any engine ping at speed?
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Originally Posted by trinogt
No engine should be programmed that way, for mileage or otherwise... There is definitely a problem somewhere... Higher engine temps are actually good for fuel economy, not so good for horsepower, so I can't see the temp being an issue. Have you had a scan done of your EEC? Autozone does it for free. I would also have the fuel pressure tested as there may be a drop in pressure causing lack of fuel.
Also, do you notice any engine ping at speed?
Also, do you notice any engine ping at speed?
No ping.
It dosen't do it all the time.
When the map sensor went bad (kept stalling), this thing really ran stronger than ever.
Cargo Master
Joined: Apr 2001
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From: Eustis FL
Wow, my Thunderbird got OBD II in 1995... I think everyone else in 1996? Must be a different rule book for trucks and vans...
Have you run the EEC IV self test diagnosis? If you are unsure how to do it,
look at: http://www.thorssell.net/hbook/eectest.html
Please post back results.
Have you run the EEC IV self test diagnosis? If you are unsure how to do it,
look at: http://www.thorssell.net/hbook/eectest.html
Please post back results.
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