HELP! 14.1 miles per gallon

[seanish4042]

HELP! i just did a gas mileage estimate on my maxima. i got 110 miles on 7.8 gallons. freaknign 14.5 mpg. thats with conservative driving. NO WOT RUNS. someone please please help, this is freakn crazy.

i just got my WS y pipe installed about 3 weeks ago.

i just ran a ecu check and got 03 04. which is knock sensor.

is this the culprit?

[Nahkapohjola]

Originally Posted by seanish4042

...knock sensor. is this the culprit?

Engine pinging & dead KS causes ign retard. This definetely affects mpg and pwr... Test it -or- use bypass resistor to tst.

(Rusted handbrake wire keeps draggin, fuel leakage (...kids do need gas) etc ???)

Btw. Tank full -measurement method has 10% error margin.

.

[seanish4042]

Originally Posted by Nahkapohjola

Engine pinging & dead KS causes ign retard. This definetely affects mpg and pwr... Test it -or- use bypass resistor to tst.

(Rusted handbrake wire keeps draggin, fuel leakage (...kids do need gas) etc ???)

Btw. Tank full -measurement method has 10% error margin.

.

hmm ill get it replaced.

im confused as to what you are saying in parenthesis tho)

[Nahkapohjola]

Originally Posted by seanish4042

...im confused as to what you are saying in parenthesis tho)

Tester will show if KS or whatever is bad, ECU codes are not always reliable. (KS is top suspect b/c of code & symptom)

Clarification - for other sudden bad mpg possibilities.
- rear brakes will not release, but keep draggin (hb wire rusted, frozen)
- fuel leak, and/or some kids have a new need...
- injector leaks
- lots short&cold driving (=no problems)

[seanish4042]

Originally Posted by Nahkapohjola

Tester will show if KS or whatever is bad, ECU codes are not always reliable. (KS is top suspect b/c of code & symptom)

Clarification - for other sudden bad mpg possibilities.
- rear brakes will not release, but keep draggin (hb wire rusted, frozen)
- fuel leak, and/or some kids have a new need...
- injector leaks
- lots short&cold driving (=no problems)

is there any way to check the hb wire? or injectors?

im sorry, i might be a moron...whats a kid?

[SuperStock96]

Thank You. I have no idea what a kid is either.

[Nahkapohjola]

Originally Posted by SuperStock96

Thank You. I have no idea what a kid is either.

I have multiple kids. They come when papa is away, siphon gas (they will invent a method) for their hobbies, rally, scooter, skiido etcetc... Symptoms: Sudden mpg drop. ...Kidney stones is another matter, dont mixup

Manual says: take injectors out with rail. Connect and see how they spray. (Surely intermittent fault is not seen). Injectors start to fail at 100k, may run lots longer. (Some say "dont buy reman", dunno, no experience)

Bad mileage b/c of brakes draggin:
Rear brakes jam b/c they mostly sit unused in salt shower. Caliper piston and or rails jam, handbrake (hb) wire jams.
- does car roll free? If suspect, jack rear up.
- do wheels rotate free? If not, bend hb wire with force. If it does feel 'loose' then its not a problem. If its very stiff, seek out the cause, possibly rust. Depends on car age/mileage/location.
- Take wheel off, check caliper if its stuck. While there, do some service...
see http://www.cardomain.com/ride/748507/18

[seanish4042]

haha thats what i thought you meant, about kids anyway.

i guess ill replace the knock sensor when i get the money. because the rear brakes seem fine, and i dont oknw if i want to mess with injectors.

if the KS doesnt solve the prob, we will look into that.

[mikedizzle]

i had a bad problem with the gas mileage of my maxima but there was a little vibration every once in a while