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zzark
*GenII*
2/06/2006
14:17:25
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 Subject: worse mileage after mods
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Message:
After all my work, my gas mileage is WORSE.
It went from a solid 19 to 15.
Any ideas to get it back?
Thanks
zzark
Indexed AP3923 plugs; Accel Tune-Up Kit,coil,foam air filter; TPS,Injector Sync; Amsoil in motor, trans, PS, rear diff; new front end with PST kit; Monroe shocks; rear sway bar; Flowmaster 50; 48 mm bored TB; FMS Bosch injectors; Black Magic fan; ASP crank pulley, 136-amp alt; Optima red top, new IAC; isolated and insulated fuel rails.
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DakotaSport
GenIII
2/06/2006
14:32:35
| RE: worse mileage after mods
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Message:
What mods have you done to it?
00 Dakota Sport CC 4.7L 4x4
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daddio
Dodge Dakota
JOIN HERE
2/06/2006
15:04:55
| RE: worse mileage after mods
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Message:
any idea what shape your O2 sensors are in?
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GraphiteDak
GenIII
2/06/2006
15:15:42
| RE: worse mileage after mods
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Message:
Don't see any reason for that much of a decrease. Unless you are simply putting the pedal to the metal like many of us do when we see crap mileage :)
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prodak
Dodge Dakota
JOIN HERE
2/06/2006
15:18:57
| RE: worse mileage after mods
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Message:
Is this a 3.9? I can see several things right off the bat. Unless you were having a detonation problem go back to a factory heat range extended tip plug. "Injector Sync" means what, that you changed it? If so change it back to where it was. I have no experience with aftermarket injectors, but unless you put in a hotter cam or something the factory ones are probably the best mpg-wise. Lastly that big alternator requires more power to spin, and if you did it because of the BM fan you probably lost more than you gained (I'm assuming you previously had a clutch fan). This is all only IMO of course, others may disagree.
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prodak
Dodge Dakota
JOIN HERE
2/06/2006
15:49:30
| RE: worse mileage after mods
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Message:
Another thing to consider is if you did TB, muffler, and injectors all at the same time you gave the PCM a lot of new parameters to adjust to - it may get better with time (or not).
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Mopar318
GenII
2/06/2006
16:41:10
| RE: worse mileage after mods
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Message:
If you checked that mileage when it was warm then rechecked your mileage after the mods when the weather was cold then that could be it. I usally go from about 16 MPG to around 12MPG when winter strikes
My rice eater
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Bob Lincoln
Dodge Dakota
JOIN HERE
2/07/2006
08:50:48
| RE: worse mileage after mods
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Ouch. My stock 3.9L gives me 20-22 mpg highway year round, about 17 city. That's a club cab 4WD with cap and 4-speed auto and 3.55 axle.
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zzark
*GenII*
2/07/2006
12:31:30
| RE: worse mileage after mods
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Message:
Thanks guys.
New O2 sensor.
PCM has been reset.
It may be the winter weather, so I'll give it some time. Although, in NC, we have had an extremely mild winter.
I tried some E3 plugs. Talk about PING, they were terrible. And they were the 3923 equivilant.
zzark
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dan millward
Dodge Dakota
JOIN HERE
2/07/2006
17:40:51
| 1997 3.9 DIES AS SOON AS YOU GIVE IT GAS
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Message:
TRYING TO SAVE A LITTLE MONEY. "12 YEAR OLD BRACES" THIS OUGHT TO BE SIMPLE CHECK ENGINE LIGHT CAME ON AN SLOWLY IT GOT WERE EVERTIME I PUT IT IN DRIVE OR SLOWED DOWN THE MOTER DIES. KNOW IT WILL HARDLY START BACK UP AN IT SMELLS REALY RICH FLOODDED. 1997 DAKOTA CLUB CAB WITH 3.9 AC AUTO 110000 MILES THANK FOR ANY HELP
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