PDA

View Full Version : bad gas millage


drftthatshit
07-26-2008, 12:11 PM
hey to any body that has a clue i have a prob my 240 goes thou gas like crazy i dont really know what it may be but i have a clue the IAT at the bottom of the MAF is broken the wires just fell off can this cause the 54 miles to the half tank im really lost this is my first import and i need a direction to be sent in

ms!3
07-26-2008, 12:30 PM
set it down one saturday. check everything. sure it needs a tune up.

drftthatshit
07-27-2008, 05:00 PM
no tune up has been done what i did find out is the IAT wires are broken which runs the car as if it were -40 out this is also located in the MAS now what i have been told is the 02 sensiors dont hold up i bought a new one but by looking at the one that is in there it seems to me to look new to me i even changed out the thermostat thinking that may be the problem because my engine only runs at 160f i know this cuz i have a lazer temp guage and i did it on the thermoustat the upper raddiator hose and the lower all temps were bettween 135 and 160 could this be the result of an o2 sensior or a mass air flow sensior plz help

drftthatshit
07-27-2008, 08:57 PM
ok replaced the o2 sensior but my engine does not get hott i have no idea what it could be the only thing i havent tryed is a fan clutch but i dont know if that would have to do with my shitty gas millage:aw:

drftthatshit
07-27-2008, 09:30 PM
what causes a 90 240sx simgle slammer to run rich and cold and by cold i mean 160f with a autozone thermo

drftthatshit
07-27-2008, 09:32 PM
i need to know whay my 90 ka single slammer will not get to opp temp it sux gas and doesnt get hot replaced thermo and o2 sensior nothing same shit diffrent day

240sxScores
07-27-2008, 09:36 PM
youre saying the temp gauge doesnt work right.

Flybert
07-27-2008, 09:47 PM
The only thing that could cause that is if your motor doesn't have a thermostat. Pop open the thermostat housing and take a look.

slothonaleash
07-27-2008, 09:47 PM
His ka24e will not heat up to operating temperature.

He has replaced his thermostat and oxygen sensor in an attempt to figure out this pickle, but to no avail.

Same shit different day.

I have no idea what's wrong, I would have guessed that the thermostat wasn't working.

blueshark123
07-27-2008, 10:00 PM
coolant temp sensor ????

projekt_s13
07-27-2008, 10:07 PM
coolant temp sensor ????

I second that :wackit:

nieko
07-27-2008, 10:13 PM
theres 2! there is the coolant temp sensor that sends to the ECU and there is one right next to it that sends it to the Gauge. if ur running rich at all i would gess the fatter square one, or just change both and call it a day :)

wh0aitznic0
07-27-2008, 11:21 PM
just change both and call it a day :)

Best idea I've seen in this topic.

MrFairlady
07-28-2008, 09:54 AM
I have a Brand New Coolant temp sensor right here.Never used.

lemme know.thats your problem.Say hello to better MPG also.
From what I hear not somerthing that normally "goes bad" but I was told by a friend to replace it anyway.

lemme know if you want it $30 shipped

Saskacer
07-28-2008, 02:38 PM
Try not using a cheap thermo?

Bigsyke
07-28-2008, 04:56 PM
well, doesnt autozone have different thermo's? 160 and 185? And running below optimum temp will cause the car to run rich, as so by having your 160* thermo in.

Plus you really are just making the car less efficient cooling wise because the fluid wont be in the radiator long enough to cool off effectivly.

replace with an OEM thermo

S14DB
07-28-2008, 07:15 PM
well, doesnt autozone have different thermo's? 160 and 185? And running below optimum temp will cause the car to run rich, as so by having your 160* thermo in.

Plus you really are just making the car less efficient cooling wise because the fluid wont be in the radiator long enough to cool off effectivly.

replace with an OEM thermo
Yeah, the parts store by me has 170* and 180* Thermostats. 180* or 185* is OEM. I would consider swapping to one of those.

Also, Try changing the ECU(two pin) temp sensor.

drftthatshit
07-29-2008, 05:33 PM
ok i replaced the temp sensior the one in the intake manifold with an auto zone 185f also the thermostat was replaced to verify on the temp it is 185f i also replaced the fan clutch also from auto zone i dont like going there but the nissan dealer by my house dosnt know dick or have any parts for my 240 after i did all that im still rich and its driving me nuts i seem to be getting no where now there is a hose that i have to address it is the egr dampner would the egr have anything to do with gas millage also i found that my raddiator has a crack in it a very small one but still an issue that is getting replaced this week end

drftthatshit
07-29-2008, 05:34 PM
there is also some sensior on my lower radiator hose is that some type of temp sensior also thanks for all the help

drftthatshit
07-29-2008, 05:40 PM
also do i time this engine the same i would time an sr hook the timming lite to num 1 wire bring the r's up to 1100 and set it to 15deg advance??????

Addicted2Kouki
07-29-2008, 05:44 PM
i have horrible gas mileage too... except a different problem.
I'm KA-T.

Is the t25 im using too unefficient, resulting in bad gas mileage?
bov is atmospheric also...
ecu is tuned by eformance.

any suggestions?
maybe check timing?
get an afc for more correction?

Bigsyke
07-29-2008, 05:44 PM
look, please learn how to type. I had a suggestion but It got lost in the run-on paragraphs.

1st lesson I learned was DONT get this checker/autozone crap for your car. Things like this NEED to be OEM. www.thenismoshop.com (http://www.thenismoshop.com) Things such as;

Coolant (honda Type II)
Oil filters
PCV valves
Thermostats
Fuel Filters
Engine rebuild items such as timing chains and gaskets
OEM or better brake pads
sensors

For now either find a pigtail AIT sensor and crimp together from a junkyard, or find the resistor you need to simulate ambient/or 90*f

Replace your PCV valve, check for vac leaks, timing, replace thermo for an OEM nissan. Check ignition such as plugs, cap, rotor and wires. Make sure plugs are torqued 17lbs, See if NTK has an o2 sensor avail.

S14DB
07-29-2008, 05:54 PM
If that hose is causing a vacuum leak I would say so. Also the EGR being open at the wrong time can affect performance negatively.

drftthatshit
07-30-2008, 03:19 PM
ok so i think i fixed my gas millage issue it was a rotted hose that goes from the egr dampner to the egr much better idle and fuel millage i also replaced all my auto zone shit with nissan direct hopfully everything will work out to a bright future of an sr20