mugenhatch92

i just swapped a y8 into my 98 dx hatch.. it was formally using a Type R motor, and all the fuel accessories with that (i.e. fuel pump)

i have a map sensor code, secondary O2 sensor code, and intake air temperature..

and i only got 150 mpg???

help me with suggestions please

2lua

try to fix all the cel first.

ubercerealkiller

im confused.. how do you get a 150 mpg? to me that would be great you'd save alot on gas but i dont think its possible LoL and i cant figure out why you'd say its horrible :-D

SnowSurfer

did you fill your tank all the way???

goldskiguy

150 mpg is GREAT, I get 28 on my old, slow dx. Did you mean 150 per tank?

Ajax

If you car gets 150 a gallon, sell it to honda for millions...

mugenhatch92

lol i mean 150 miles to my full gas tank lol

sorry about that mix up...

but normally i got 35-40 mpg and right now im getting like 17 mpg....

i dont think the secondary should throw it off that bad@!?@?@?@?@ ii hate it

ubercerealkiller

oh well hell, that sucks then LOL

AphexMatt

When my 98 hatch's (stock y7) Primary O2 died I went from 30mpg to low 20s, I replaced the sensor and all is back to normal. You must be running rich as Trump, fix the codes and then see whats up.

EE_Chris

A base fuel injector pulse width is referenced by two inputs - RPM and MAP.

You have a code for the MAP - well I don't think the ECU is gonna want to rely on what your MAP sensor is spitting out since its already deemed a problem with it....so since it has to use something for an input, it uses a back-up set of values to allow you to limp home and FIX the problem.

mugenhatch92

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EE_Chris &raquo;</TD></TR><TR><TD CLASS="quote">A base fuel injector pulse width is referenced by two inputs - RPM and MAP.

You have a code for the MAP - well I don't think the ECU is gonna want to rely on what your MAP sensor is spitting out since its already deemed a problem with it....so since it has to use something for an input, it uses a back-up set of values to allow you to limp home and FIX the problem.</TD></TR></TABLE>

i only got a little bit of that lol

yes i need to fix the secondary 02 for sure

DJ_SaNdOz

A bad MAP sensor & O2 sensor will give you awful mpg, fix them, and you will see much more normal mpg..

fishnfst

When your car is running too rich or too lean it ruins the o2 sensor. My o2 stopped cycling when my car was running lean it also stopped working when my car was running too rich...

Kamin

yea uh MAP and O2 codes will totally DESTROY your mileage.

mugenhatch92

i have my primary in there, so it wont work even when i put my secondary back in?? because it will be ruined?