Sudden Weird Drop in Gas Mileage...Ideas?

[wsudu]

I have an 02' 4x4 and things have been fine forever. I did my 60K service in July and that was fine. I have been getting the usual 16-17 in town and maybe 19-21 on the Highway. Now I am getting 12ish in town. Tires are inflated right. Everything checks out, but I will say this. I have a remote start and for the last 3 weeks or so it doesn't fire on the first try. So when I do turn it over again after that, it hesitates likes it was flooded , then revs. Do you think i could have fouled a plug(s) and how can I tell? Do I need to reset some ECU or something? I don't know what the deal is. No leakes either. Thanks......B

 

[greasefingers]

At the 60 k mile check-up the spark plugs should have been changed. I would pull a plug and inspect it. That way, you will know if that was done and also know if they are fouling.

Don

 

[<<<<]

Change Spark Plugs.

 

[wsudu]

I put new ones in at 60K..What does a fouled plug look like?

 

[Good Times]

check the gap spacing on the plugs.

or the other thing to look might be the cables as one might have popped off.

 

[RunnerUp]

i have an 02 4x4 and im getting 12.6 around town, sure i dont have the right gears in it and my tires are really low on air pressure...

let me know what it is so i can check mine out


good luck

 

[wsudu]

Well i don't think it's a cable because wouldn't the motor be shaking a lot if 1 piston wasn't firing? And I know that the gaps are dead on. What about the MAF....or any other sensors? Any maintenece that I need to do there?

 

[Boston_Runner]

If one of the cylinder is not firing, the engine should shake a little but less so on a V8, My guess is something to do with the intake or emission system.

 

[mikes4runner]

Clean the MAF

Mike

 

[wsudu]

Wht about resetting the ECU? So it can learn the gas mileage trend again? You know what I am talking about.

 

[greasefingers]

Clean the MAF

Mike

Oh yea, clean MAF as Mile has stated.