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Custom Dodge Ram Performance Mods - Engine - 5.9 Liter V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!


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  #1  
Old 12-11-2009, 09:54 PM
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Default Alright guys, I need some help here!!!

Here's the deal, I have the 99 ram 1500 with a 360. When i got the truck it got like 10 mpg. Then went up when i fixed the problem with the cat and o2 sensors. It was at around 13mpg. But over time it has dropped steadly and its at 8.9 now!!!! Now I have done the intake manifold gasket TSB, it has a magnaflow hiflow cat, Supper 44 flowmaster dual out, Accel Cap and rotor, and Superchips 3815 set on 91 performance and im running 93 octane. My driving style hasnt changed any but yet my MPG is dropping like crazy!!! Not throwing any codes, no misfire or spark knock, air filter is a little dirty but its still fine. WHAT DO I DO????? Any body know what the problem might be????
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Old 12-11-2009, 10:35 PM
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Your right , your mileage has gone to poo . Your check engine light hasn't been on by chance has it ? Still might not be a bad idea to have it checked anyway . If it checks out ok , check and see if your gas station is running that oxygenated fuel (winter time fuel) . That will effect your mileage also . Might want to pull a spark plug and see how it's burning .
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Old 12-11-2009, 11:22 PM
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Ya i was planning on replacing the plugs and wires with some accels anyways, so i guess it would hurt to check them. But no i havent had a check engine light since i replaced the cat and o2 sensors about 6 months ago. I didn't even know about this oxygenated fuel?!?! thats weird, whats different about it?
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Old 12-12-2009, 01:05 AM
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http://www.wisegeek.com/what-is-oxygenated-fuel.htm
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Old 12-12-2009, 07:34 AM
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Clean that throttle body. Can u find out your adaptive memory to see if it's running lean or rich. U will need a scanner.how's your oil consumption?
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Old 12-12-2009, 10:56 AM
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What about a plenuem leak? Look down the throttle body to see if there is oil, I believe is how you check that.
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Old 12-12-2009, 09:20 PM
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No more plenum leak, i fixed that problem.
Im good on oil not using any.
Don't know about the memory thing, i have an OBDII scanner but not sure how to check that.
And what should I use to clean the throttle body?
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Old 12-12-2009, 11:04 PM
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Throttle body cleaner. Unbolt t frm the intake, rese the old tbody gasket if it's not torn or cut. Remove the IAC motor and clean the iac and tbody thoroughly with a toothbrush. I bet it's filthy. That will help a lot. Did u replace that belly pan gasket or did a shop do it for u
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Old 12-12-2009, 11:12 PM
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I did it myself, I'm not gunna pay someone to do something I can lol. But yes i replaced the belly pan gasket, and the upper gaskets and cleaned the intake really good when i did it, and the throttle body didnt look bad so i didnt mess with it. but i might just do that monday or something. And where abouts is the IAC motor?
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Old 12-13-2009, 07:21 PM
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Is that 8.9mpgs coming from paper/pencil method, or the trucks computer? I know that I reset my computer, and my average mpgs looked really bad for a couple weeks. Just an idea. Otherwise listen to everyone else.
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