help on shitty fuel consumption

[Rocket]

well at the moment ive figured out my z24 carb is running at 17L/100km

for you US guys thats 13.84 MPG.

im going to try and make the mixture leaner by adjusting the carb, and im going to get new plugs for it,

apart from that, any other suggestions?

[ScottXGTR]

id say dont stop at the plugs. do a full tune up. plugs, wires, dizzy cap and etc. 14 mpg with a 4 cylinder is pretty bad. something has to be up

[jdoe44]

It should definitely get better than 14. I always do plugs, wires, cap, rotor, and air filter whenever I buy a used car. Another likely suspect (at least for the later HBs) would be the coolant temp sensor. I don't know how much electronics the carbed z24's have though.

[Rocket]

(at least for the later HBs).
'87 hb

[burrsg101]

dont feel bad i just found out my pathy is running on original EVERYTHING from the factory. plugs wires cap and rotor, t-belt, accessory belts, clutch, and i just replaced the thermostat and fuel filter which were original. the only thing this has gotten since it cam out in 94 is oil changes. and it has like 160k on it. im so scared something is gonna crap out, and i only get like 10 mpg if im lucky, which should improve now with the new thermostat because the old one was stuck open.

[Rocket]

dont feel bad i just found out my pathy is running on original EVERYTHING from the factory. plugs wires cap and rotor, t-belt, accessory belts, clutch, and i just replaced the thermostat and fuel filter which were original. the only thing this has gotten since it cam out in 94 is oil changes. and it has like 160k on it. im so scared something is gonna crap out, and i only get like 10 mpg if im lucky, which should improve now with the new thermostat because the old one was stuck open.


ohh fuck ay.. most of you will be like oh well thats life, but i got a half hour drive to school- (senior) then a 15 min drive to work, then a 40 min drive home.. on 14MPG

I DONT MAKE ENUFF MONEY lol

[JsD21HB]

fuel filter is never a bad idea, if you know how to use an ohmmeter then u can test the coolant temp sensor if the z's have one im unfamilar, maybe try running some seafoam though it both in the tank and through the brake booster hose. my .02

[burrsg101]

ohh fuck ay.. most of you will be like oh well thats life, but i got a half hour drive to school- (senior) then a 15 min drive to work, then a 40 min drive home.. on 14MPG

I DONT MAKE ENUFF MONEY lol
haha i feel ya there, i just graduated last year and i dont even have a job right now so my horrid gas mileage sucks, and i cant drive the z which got like double the mileage cuz its already in storage for winter :(

[Rocket]

haha i feel ya there, i just graduated last year and i dont even have a job right now so my horrid gas mileage sucks, and i cant drive the z which got like double the mileage cuz its already in storage for winter :(


pisses you off hey, the whole reason i sold my r31 skyline was because i thought it was going to murder me for fuel. so i buy another nissan (yes.. loyal) and bang, the ute is worse than the skyline.

the skyline was running 12l/100km (20MPG) which isnt that bad concidering it was an RB30, then i go to a 2.4 low revving thing which i think Great.. here we come 8l/100km (29MPG).. but not i got 17l/100km (14MPG).
I spend $75 every >WEEK< to keep it running. I Drive to skool, work, then home, thats it.

[peterikan]

dam that's crazy! mine varies between 14 and 17 and i've been eating through spark plugs...put a set in 2months ago and put maybe a combined total of 500 miles including this past wknd going up to rome for Outlandish bash show...check em kuz it smelled rich and they were f@#$ed!!!! and whenever i have the air filter on it seems to be choked up.IDK????????

[burrsg101]

try putting slightly hotter plugs in peter, but ya rocket i know what you mean. my z has the brother engine to my pathy, (z has vg30de soon to be tt, and the pathy has the vg30e soon to be t) and somehow even though the z is like 60 percent more power stock i got like 25ish around town with the mods i had on it.

[Rocket]

try putting slightly hotter plugs in peter, but ya rocket i know what you mean. my z has the brother engine to my pathy, (z has vg30de soon to be tt, and the pathy has the vg30e soon to be t) and somehow even though the z is like 60 percent more power stock i got like 25ish around town with the mods i had on it.

now that pisses me off haha, do u think an injection manifold and setup would be worth it?

[burrsg101]

personally im not a fan of carbed at all so yes id say its well worth it, theres a very good reason why everyone switched to fuel injection (aside from government standards of course) youd probably get a tiny hp boost from it along with some better gas mileage

[Rocket]

with the stock piping, ive set up a CAI, the original piping had a tiny inlet, ive tripled the size by opening the previously sealed end of the pipe up, i have it sitting just behind the nissan badge on the grille, its definatly helped a bit, alot better sounding car, more go, and a tiny bit better fuel consumption.

i know a guy who knows a guy who is like king at tuning carbs, he does race carbs and everything, im booking it in for a tune up. hopefully it will double the mpg, it doesnt sound right for the type of car at the moment.

ill keep updated

[yeti_'87HB]

did you try changing the fuel filter, it is a very common thing to overlook, it should be a little cannister on the passenger's side of the engine bay, i have and '87 z24 as well and thats where mine is

[Rocket]

i dont see how that would make the mixture too rich, but ill try it anyway

[iRay808]

put some moth balls in your gas tank n do a full tuneup including tire rotation

[yeti_'87HB]

the fuel filter won't make the mixture too rich or lean, but a dirty fuel filter severly ristricts fuel flow, which greatly effects gas milage. when i first started drving my truck, i was only getting about 375kms out of a full tank of gas, i changed my fuel filter and it went up to almost 500kms/a tank, then i did the rest of my tune up (plugs, wires, air filter, oil change, etc) and i get around 650kms to a tank

[xmb63]

fuel filter is never a bad idea, if you know how to use an ohmmeter then u can test the coolant temp sensor if the z's have one im unfamilar, maybe try running some seafoam though it both in the tank and through the brake booster hose. my .02

Sorry to whore.
Would the coolant temperature sensor make the truck sometimes idle at 1700rpm and at other times sputter like its tring to stall. Then sometimes it will just run fine.
this is in a 95 with the ka motor.

[Rocket]

update:

fuel filter was filthy- changed
plugs were crap-chenged
oil- still to come
timing- advanced to 20* without pinging

when buying the plugs, i asked him to look up what plugs i needed on the computer, by telling him it was a navara. He found them and the guy goes just four? and i was like nah mate, 8.. he gave me the weirdest look lol.

you should have seen the shitty $2 ($1.34481 USD LOL) one that was in it, it was meant to be white.. it looked like someone had put dirt in it before fitting it.

all fixed and hoping for less money out of my pocket

[OLDSCHOOL]

the plugs are diffrent for the intake and exaust

[burrsg101]

haha sounds like my plugs except mine are original factory like i said. i need money bad haha

[Rocket]

the plugs are diffrent for the intake and exaust

dont say that.

farkkkkk..

at the moment ive got bosch wr9dc in both sides (WHICH IVE FOUND OUT IS COMPLETELY WRONG)

Looks like im going back to supercheap for:

bp5es - W8D/W8DC/W8DCO

bp6es - W6D/W6D1/W6DC/W6DCO

Hes given me: BPR5ES - WR9DC

Which one is the inlet side and which is the exhaust?

[tattoos&minitrucks]

the parts guy shouls be able to tell U ...I did the same thing last time I did a tune up....U think the dumb shit kid would have told me that but no I get it all done and it is still running like shit ....I call my friend and that is the first thing he asks me....so for sure look in to that

[Rocket]

my mate works there, im going in again on thursday with the recipt and empty packets and im gunna tell the manager the guy who did it (some guy who was there just for the renovations) fucked up, they will probably want the plugs back, they can take them out of my car themselves if they want them to throw out (there used so theres no resale value) and im takin the new ones.

he even looked at the computer n was like yer dat dem der and im like ok then..

[tattoos&minitrucks]

ya it makes U wonder ....what happen to the old guy that had been working on cars since they were still horse and they put some dumb shit kid that does not even drive back there to help out

[garetcurry]

I'm slightly coming off topic (I know you're still dealing with a spark plug issue), but still staying on the main scope of the whole shitty gas mileage deal. I've been eying this site for a while now : http://www.aquauto.com To sum it up, it's a site about making hydroxy boosters. Some people believe it, some people don't, but these people are about eliminating the doubts and seem to be producing some results.

My 92' 4x4 current gets a whopping 18 miles to the gallon (combined). I've been thinking about making one of the boosters they have on the site just to see if it's even valid. Quick note, it all may seem a little overwhelming at first, but if you like to tinker I'd give it a shot like I'm [eventually] going to.

[VG30E]

at the moment ive got bosch
Bosch and Nissan = bad
use NGK.

Every customer I have that has bought
Bosch plugs has returned them and got NGK's. I don't know why but they do not work well with Nissan ignition systems.

Just the plug brand could be your problem. I will get the right part numbers for you when I get to work in the AM.:cool:

[JsD21HB]

yeah bosch is another word for rip off quad dropple ground electrodes what a joke.

[yeti_'87HB]

i'm not sure if i read t right or not, but are you supposed to run 2 different types of plugs, 4 of one type on the intake and 4 of the other on the exhaust side? cause i'm running 8 champion plugs and all 8 are the exact same part number, and i've haven't had any problems with how it runs since i changed them, and i get better gas mileage then the ones that where in it before

[SkinnyG]

Did something happen suddenly to cause the poor economy, or has it steadily declined, or has it always been?

What is the engine's compression? Do a test.

What is the engine's vacuum?

Check for missing/damaged vacuum lines and/or leaking gaskets - air leaks which cause a drop in vacuum will cause the power valve to open sooner, dumping more fuel in (though you should notice a rougher idle, or surging due to the air leak).

Check the float level - has the plastic float started absorbing fuel? A heavy float will make the engine run rich everywhere.

Check the needle and seat - If it doesn't close, fuel may overflow into the engine by the pump.

Is the choke releasing?

Are the brake calipers/cylinders seized and always dragging?

Just some more direct pointers....

[Rocket]

Did something happen suddenly to cause the poor economy, or has it steadily declined, or has it always been?

What is the engine's compression? Do a test.

What is the engine's vacuum?

Check for missing/damaged vacuum lines and/or leaking gaskets - air leaks which cause a drop in vacuum will cause the power valve to open sooner, dumping more fuel in (though you should notice a rougher idle, or surging due to the air leak).

Check the float level - has the plastic float started absorbing fuel? A heavy float will make the engine run rich everywhere.

Check the needle and seat - If it doesn't close, fuel may overflow into the engine by the pump.

Is the choke releasing?

Are the brake calipers/cylinders seized and always dragging?

Just some more direct pointers....

i bought the car without knowing about how much it drinks, i know a vacuum hose was wrong on it (and it was running shit and lean) immediately when plugged into the right plug, shot up to a nice steady idle.

ill tell u what, its fkn ugly under there, 3 or 4 plugged up hoses makes u wonder what guy who did it was smoking.

Whats the float thing?

at the moment even with boschs i can definatly notice a difference. (the fuel filter was an excellent idea JsD21HB (http://infamousnissan.com/forum/member.php?u=22)) 20* ignition timing at the moment..

umm
what do you guys run for plugs and what do u think about them?

[Rocket]

yeah good idea as well, ill check my brakes too.. it likes to pull to the left a bit, might just be camber, toe, or alignment, but its worth a test

I'm slightly coming off topic (I know you're still dealing with a spark plug issue), but still staying on the main scope of the whole shitty gas mileage deal. I've been eying this site for a while now : http://www.aquauto.com (http://www.aquauto.com/) To sum it up, it's a site about making hydroxy boosters. Some people believe it, some people don't, but these people are about eliminating the doubts and seem to be producing some results.

My 92' 4x4 current gets a whopping 18 miles to the gallon (combined). I've been thinking about making one of the boosters they have on the site just to see if it's even valid. Quick note, it all may seem a little overwhelming at first, but if you like to tinker I'd give it a shot like I'm [eventually] going to.

theyve tried to sell a lot of things on ebay related to it.. if you have utorrent or something you can download the ebook (free but not ethical) which pretty much tells you what you have to do.. using electrolosis (some guy in a uni in sri lanka has perfected it) you can run your car totally off water.. the guy got something crazy like 70km from 1 litre of water (198 MPG FROM 1 GALLON OF WATER)

petrol companies threw billions at him to buy it, but hes developing it for his country to sell..

i was looking into whats involved in making it.. it looks tough though

[VG30E]

According to my parts catalog it takes 8 of the same plug. NGK BPR7ES

[Rocket]

is that what you run?

are they good?

[VG30E]

It's what the motor is set up to run from the factory. I wouldn't put anything other than NGK's in a nissan at all.

[Rocket]

ok.. im going back to the shop tomorow..

ill get those plugs.

thankyou everyone for your assistance ;)

[Rocket]

super cheap wouldnt refund my plugs, i broke a lead and drove 25 kms for no reason. after replacing all the parts ive either not tightened my sparks enough, or have plugged a hose in wrong.. and now my car is running worse than it was before i changed the plugs :mad:

this is crap. crap. i hate this fucken car and im over it. i brought the plugs back in boxes with recipt within 7 days and they said no, i tol them my car was idleing shit and stalling etc. ohh our big manager isnt here at the moment, drive another 40k's each way next time for a maybe chance of getting them refunded, maybe that will pay for one of ur trips of petrol.
they will try and send me to the bosch outlet and there just going to fuck me around..

[SkinnyG]

Whats the float thing?

Should be a window on the front of your carburetor with something like this in it (this is not a Nissan carb):

http://www.off-road.com/trucks4x4/data/articlestandard/ford/472005/198754/bowl.jpg

There usually is a line etched on the glass where the fuel level should be. If the fuel level is not on the line, it needs adjusting or fixing.

If there are some hoses plugged, you really need to get a vacuum diagram (there's one under the hood, no?) and sort that out. Dough-heads yanking emission stuff usually do more harm than good, most of which costs in fuel economy.