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- Dodge Ram 2nd Gen Why Am I Getting Poor MPG
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Poor Gas mileage & Loss of Power "Solved"
#41
I put in a new set of 3923's, wires, cap and rotor today and I replaced the MAP sensor with a new one. At a cold idle in my carport it had 1.9 volts from the new sensor, it started quicker and had a much smoother idle. I test drove it and again it had much better power and throttle response. It was really good to climb hills in 5th gear at 65 mph again. Truck is running ten times better than it was. I need to drive it a while to see how it affects the MPG, but even since yesterday, I am pretty sure it's using less gas. If I can get even just 3 or 4 more MPG I will be glad.
Thanks for posting this and to everybody who replied. New MAP sensor made a world of difference on my truck.
Jimmy
Thanks for posting this and to everybody who replied. New MAP sensor made a world of difference on my truck.
Jimmy
#43
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#48
Check a couple local dealers. I got my map sensor from Dodge for $23 and I have a 2003 4.7 so it should be the same.
#49
My books don't differentiate between 3.9's and 4.7's for the output voltage. 1.4 is in specs, but low on the scale of acceptable. Lowest it should be is 1.3. Highest at idle with throttle plates closed should be 2.0. If it was mine I would replace it.
I already picked up almost another 3 MPG around town since I replaced my MAP sensor. I got a tank last weekend and filled up again today and divided the mileage by the gallons, it was 19.23. I'm pretty happy with that. I ordered 2 new upstream O2's from NGK Monday and they should be here tomorrow. When I get those installed this weekend I hope to gain another couple MPG's.
Jimmy
I already picked up almost another 3 MPG around town since I replaced my MAP sensor. I got a tank last weekend and filled up again today and divided the mileage by the gallons, it was 19.23. I'm pretty happy with that. I ordered 2 new upstream O2's from NGK Monday and they should be here tomorrow. When I get those installed this weekend I hope to gain another couple MPG's.
Jimmy