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terrible gas mileage?

B

Blue GTP

New member
i am getting probably 15 for mixed and other then a few punches a week i drive relatively preservative. what should i start to check it. it starts fine and has random misfires at idle and low acceleration up a hill.all the plugs are new(5k miles) along with new ac delco wires at the same time also cleaned all the terminals on the battery packs and put a nice amount of di-electric grease on everything.
 


What year of car?

Tire's properly inflated?

Random missfires could indicated a bad plug, wire, or coilpack.
 
it is a 00 gtp i put autolite 606s and tires are set at 30 with nitrogen
also how do you go about cleaning the maf, my k&n is clean, and no i recently checked my codes cause ses came on and only reason was my ****ty rear 02 sensor didnt go off for almost a month after the catless dp install but only code was the rear o2 sensor going off.
 
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rynoman03 said:
Random missfires could indicated a bad plug, wire, or coilpack.
Click to expand...

Add ICM to this list as well as bad gaskets.

Factory tire reccomendation is 35, I run mine a little higher.

You clean the maf by spraying MAF cleaner on the sensor. Don't use anything but MAF cleaner.

You said you have a catless downpipe, any other mods?
 


Its a possibility that the catless downpipe is your issue since you don't have a pcm.

I forget the details on how that system worked before 01 though. I know 01+ Needed an O2 simulator or tune.

sLpGPGT My 05 N/A 100% stock gets 30 MPGs, you're doing something wrong.
 
Explicit_Spade said:
Its a possibility that the catless downpipe is your issue since you don't have a pcm.

I forget the details on how that system worked before 01 though. I know 01+ Needed an O2 simulator or tune.

sLpGPGT My 05 N/A 100% stock gets 30 MPGs, you're doing something wrong.
Click to expand...
ppl keep telling me cause its my heavy foot, but i highly doubt thats the only reason, unless i needa reset and the 15.2 read is wrong, but idk ill figure it out eventually
 
I guess this hasn't been mentioned in this thread yet. Don't rely on your DIC for accuate mileage estimates.

Do the math manually for the best results. Gallons / Miles = MPGs takes about 10 seconds to do before leaving the pump.
 
ill do that first before i do anything, and yea it doesnt feel/look like i get 15.2 mpgs but thats what it tells me and everytime im like i doubt thats right
 
Explicit_Spade said:
I guess this hasn't been mentioned in this thread yet. Don't rely on your DIC for accuate mileage estimates.

Do the math manually for the best results. Gallons / Miles = MPGs takes about 10 seconds to do before leaving the pump.
Click to expand...

HMMM...After cross multiplying, Gallons squared = Miles squared.
Think you better check your math. LOL
 


Explicit_Spade said:
I guess this hasn't been mentioned in this thread yet. Don't rely on your DIC for accuate mileage estimates.

Do the math manually for the best results. Miles / Gallons= MPGs takes about 10 seconds to do before leaving the pump.
Click to expand...

Fixed :th_winking:

did you replace your fuel filter? are you using 93 octane? your rear having a code up could effect your mileage, as said before, try to find someone local who knows how to tune and have them give you a custom one. that will help alot.
 
its miles divied by gallons bro but hes right the DIC is never right usually ofe by 2-3 miles per gallon
 
Swiggles said:
Fixed :th_winking:

did you replace your fuel filter? are you using 93 octane? your rear having a code up could effect your mileage, as said before, try to find someone local who knows how to tune and have them give you a custom one. that will help alot.
Click to expand...

once i get my 3.4 i will be getting a tune also i have been told that for 00 the rear o2 sensor doesnt effect the pcms fueling only the front sensor also i have nothing in my trunk i am running 91 octane(Highest we have in nd) and i had this ****ty mpgs before the dp too and i do go by my dic but i still can only get about a week out of a tank between school and work which is MAYBE 35 miles a day if that
 
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