highrollersk5

I am getting horrible gas mileage I went from 21 to right around 10 mpg and have replaced the fuel pump filter 02 sensor injectors fuel pressure regulator map sensor tps sensor iac sensor spark plugs wires cap and rotor my jeep runs perfect but my mpg went way down and have no idea what's wrong any thoughts?

JrRifleCoach

Lots of posts here trying to find the same answer.

Who ever figures this out will be a rich man

XJ4life92

dragging brakes? i have no idea...ive always gotten around 12 or 13mpg average. im surprised if i get more then 230 miles/tank.

duncan0668

I drove to Orlando and back Monday, it was 234 miles round trip. The guage shows 1/2 tank but I havent refilled it yet but should be about 20 mpg. I usually set the cruise at 66 to get this milage. I know at 70 it drops to the high 17's. low 18's. Stock 99 Sport with 235-70r-15's

My375hp302

Read this whole page...

http://www.lunghd.com/Tech_Articles/...iagnostics.htm

Could also be you coolent temp sensor or the manifold air temp sensor. Both help the computer control the air fuel mixture.

With the vehicle running and warmed up go take a big sniff of your exhaust. Does it smell like gas?

highrollersk5

I am a broke man but trying to figure it out thanks for that website, i deleted my egr valve cuz i dont have deq but what would cause it to stall in drive without giving it gas? It doesnt smell rich at all but i can smell a gassy smell coming from under the hood after i get on it sometimes. I am also getting pretty bad blow by but no smoke from my muffler no lack of power

highrollersk5

Also my fuel gauge is jacked up i did 2 new sending units and same they didnt do anything when i give it gas it goes down and when i hit the brakes it goes up same things on corners also it will never read full full and when on empty it will only take 10 gallons

josh77

check your fuel pressure regulator, i was smelling gas every now and then and finaly looked under the hood and saw fuel pooling on the heat sheld. not cool! it was from a bad o ring to the rail. good luck.

My375hp302

X2, I had a 85 ford ranger with a leaky carb, not enough to notice on the ground, but I sure noticed the mileage go from 22 to 8 mpg. Definatly check on the whole fuel system looking for a leak!

highrollersk5

I replaced the whole fuel system already and neworings in injectors i havent replaced the throttle body so may try that after i try the mat and cts sensors thanks for the advise

highrollersk5

I deleted the egr valve but what do i do with the solenoid wires? splice them together?

My375hp302

Check your fuel system all the way back to the tank, it could be leaking anywhere. If your exhaust doesn't smell like raw gas then you probably have a leak, it has to be going somewhere.

highrollersk5

I went threw the entire system and no leaks what so ever it doesnt smell rich at idle but was told from my buddy while driving behind me it smells rich

My375hp302

Hmmmm, that sounds like a TPS or MAP sensor then but you said you replaced them. You caould have a broken wire for one of those sensors tho, Unplug the MAP while it running and listen for a change to verify it's connected and working. Did you adjust the new TPS to the proper voltage?

highrollersk5

Yes everything is on i had a bad map sensor before and when i unplug it the idle drops. I went behind it today after i drove it for awhile and it did not smell rich at all is there any way gas could some how get into the intake thats the only place i can think it is going. Also drove it hard shut it down right away pulled a plug and it looks fine