lost gas mileage
Thread Starter
Joined: Nov 2007
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lost gas mileage
on my 99 dodge 1/2 2wd 318 ram i used to get about 330 miles a tank till the gas light comes on truck has 400,000 miles on it the 5 cylinder misses sometimes narrowed it to the point of dirty injector and it has done that since about 100k miles has new oxy sensors got put in about 50k miles ago i dont know what is causing it any know what could cause it?
Captain
Joined: Oct 2006
Posts: 732
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From: Suffolk, VIRGINIA
RE: lost gas mileage
have you done full tune up?
plugs, wires, cap, rotor, replaced the bad injector?????
your running on 7 cylinders... they have to work harder to compensate...
= bad MPG
how is the plenum in the truck?
plugged exhaust system can cause a Seriously BAD MPG issue
plugs, wires, cap, rotor, replaced the bad injector?????
your running on 7 cylinders... they have to work harder to compensate...
= bad MPG
how is the plenum in the truck?
plugged exhaust system can cause a Seriously BAD MPG issue
Thread Starter
Joined: Nov 2007
Posts: 29
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From:
RE: lost gas mileage
well it had a full tune up about 15k ago and thecylinder only misses in city drving and every once in a while at that but the in and its only running about a 5% more fuel when i checked it with snap-on scanner and ya its a dodge will last forever
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Champion
Joined: Aug 2005
Posts: 3,313
Likes: 8
RE: lost gas mileage
Did you change the oxygen sensors
before or after
the miles per tank change happened?
Did you use NTK oxygen sensors (what Chrysler used most years)
or did you use Bosch (what most auto parts stores carry) ?
Some Ram owners have reported problems with Bosch O2 sensors.
If you suspect the injector in #5
I personally would have swapped it over to its 'sister' cylinder #6
and see if the miss goes to #6 too.
At 400,000 miles it is not a bad idea to pull all the fuel injectors and inspect the little screens at the top designed to catch stuff big enough to foul the injector pintle. Have new o-rings on hand to reassemble.
At 400,000 miles
is your torque converter lockup clutch still working right
or do you have a manual trans?
My TCC failed at 180,000 miles.
Have you changed tires recently,
added a high camper top,
or put on a heavy tool box?
before or after
the miles per tank change happened?
Did you use NTK oxygen sensors (what Chrysler used most years)
or did you use Bosch (what most auto parts stores carry) ?
Some Ram owners have reported problems with Bosch O2 sensors.
If you suspect the injector in #5
I personally would have swapped it over to its 'sister' cylinder #6
and see if the miss goes to #6 too.
At 400,000 miles it is not a bad idea to pull all the fuel injectors and inspect the little screens at the top designed to catch stuff big enough to foul the injector pintle. Have new o-rings on hand to reassemble.
At 400,000 miles
is your torque converter lockup clutch still working right
or do you have a manual trans?
My TCC failed at 180,000 miles.
Have you changed tires recently,
added a high camper top,
or put on a heavy tool box?
