i need to know if its normal with a 90 civic 1.5 motor to suddenly go from 35 mile per gallon to 20mpg just from messing with the catalytic convertor, the thing is hollowed out??????????????any info would be great. i was told these motors require a certain amount of back pressure to work right, is this true??
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Quote:
Originally Posted by 90lxcivicnocat
i need to know if its normal with a 90 civic 1.5 motor to suddenly go from 35 mile per gallon to 20mpg just from messing with the catalytic convertor, the thing is hollowed out??????????????any info would be great. i was told these motors require a certain amount of back pressure to work right, is this true??
wasn't there a thread very similar to this in the civic section???? No, its not the cat. its either your driving or something else wrong with the car
THANKS GUYS, I WASNT GETTING NO RESPONSES TO MY POST SO I REPOSTED IT A FEW TIMES, SORRY,ANYHOW IM A NEW IDIOT ON HERE AND DONT KNOW COMPLETELY HOW THE SYSTEM WORKS EVEN THOUGH I READ STUFF.
I DIDNT THINK IT WAS THE CAT, I HADNT CALCULATED MY GAS MILAGE IN A WHILE, BUT ALL I HAVE IS A 4DR CIVIC (90) WITH A 16VALVE 1.5L MOTOR, I GEUSS THATS A D15 MOTOR?? IT HAS ALOTA MILES ON IT..260K RUNS GOOD, SEEMS SLUGGISH, THE CAR IS SLOW, BUT IM TOLD THATS NORMAL FOR THAT MOTOR AND CAR. I HAVE A NEW CLUTCH, RAM AIR, NOT TO BE CONFUSED WITH COLD AIR, NO CAT AN A CHEAP RACE MUFFLER THATS JUST 2.5" SIZE WELDED ONTO THE STOCK PIPE STARTING FROM THE BACK PASSENGER SIDE WHEEL.SO I DONT EXPECT IT TO GO FAST,BUT THOUGHT I WAS GETTING GOOD GAS MILED TILL I CALCULATED IT THE OTHER DAY. I DONT WANN DRIVE A SLOW CAR THAT GETS 20MPG!! BECAUSE I CAN DRIVE MY OTHER CAR AND GO FAST ANG GET 15MPG.
I LIVE BY A PLACE THAT SELLS JDM MOTORS FOR AROUND 600, WHAT IS GOOD MOTOR TO PUT IN THIS CAR THAT WILL GET UP?I WAS TOLD A ZC MOTOR. LET ME KNOW.
hard to say why its gone from 30-20mpg w/o really knowing the car....try reseting the ecu by taking the neg. cable loose from the battery for a good 30-45mins and then go from there. also your driving style might have partly to do with it. 260k is alot of miles though.
ILL TRY RESETTING THE ECU. I DIVE IT HARD, ALWAYS HAVE, HAD IT SINCE SEPT LAST YEAR. GREAT LITTLE CAR, STILL CAN SMOKE THE TIRES BUT IS WAY SLOW TAKING OFF,LOL! HOW DO U READ CODES ON THE CAR???I VAGUELY HEARD ABOUT THE FLASHING LIGHT UNDER THE PASSENGER SIDE ON THE ECU, BUT I DONT REALLY KNOW HOW TO MAKE IT DISLAY A CODE OR WHAT THE NUMBER OF FLASHES WOULD MEAN ANY WAY
on OBD 0 (what you have) it should be flashing if you have a code. Long flashes = incriments of 10 / short flashes = increments of 1.
For example
Long Long Short = code 21...then you pick up your helms or haynes or whatever manual you have or look it up on the internet and see what the code is for.
OK WELL I GOT THE TERMINAL OFF RIGHT NOW JUST WAITING. I KNOW IT DOES FLASH, IVE SEEN IT BEFORE, AND IT DOES IT QUITE A FEW TIMES, POSSIBLY REPEATING THE SAME CODE??? OR MULTIPLE CODES MAYBE? DOES IT GIVE A PUASE BETWEEN CODES??? AND WHERE CAN I FIND THE TROUBLE CODE INFO ON THE NET AT, IF U KNOW, THANKS
ALSO I PULLED MY PLUGS TO SEE HOW THEY LOOK. PRETTY GOOD EXCEPT I HAVE A LITTLE BIT OF OIL AROUND THE TOP OF MOST OF THE PLUGS AND THREADS TOO, ISS THIS A SERIOUS ISSUE? OR JUST A MINOR LEAK IN THE VALVE COVER SEAL???
it would be a VERY fast car if you droped in the JDM d15B. its like your engine BUT it has a better r/s ratio and is extremley rev happy. Its an awesome base for anything you want to do to it. it also has 3 stage vtec, below 2500rpm it only has 1 intake valve per cylinder, les air and less gas= AWESOME mpg.
but at about 5200rpm you have a high cam too for a nice broad flat tq curve.
from the net a JDM d15b can be had for 550. tht tranny ecu, WHOLE motor and les then 50k on it
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