I have a Honda Prelude Si. It used to get good gas mileage (30+ MPG), but within the past four months the mileage has plummeted to <25 mpg. I can use 1/4 of a tank to go 30 miles!
This sucks big time! Any suggestions as to what might be causing it? And no, I don't have a leak in my gas tank either. And no, it's not being siphoned. I can see the gas gauge move while I'm driving.
2007-03-20 14:43:23 · 11 answers · asked by whatz_upchuck 2 in Cars & Transportation ➔ Maintenance & Repairs
Well, I was going to suggest that a clogged air filter will cause a loss of MPG, but 1/4 tank in 30 miles??
Is it running OK otherwise? No smoke or odd smells from the tail pipe? I am thinking of your injectors, that one may have gone bad on you.
2007-03-20 14:50:04 · answer #1 · answered by Anonymous · 0⤊ 0⤋
If you dont have any visible gas leaks, Their are a few things you can do that are probabally causing your problems. First you need to change your fuel filter filter if it hasent been changed within the past 35 to 40k. A clean air filter will make a big difference in gas mileage, as well as proper tire pressure. Low tire pressure will cause a dramatic fuel mileage loss. Check for the last time you had you had a tune up. If needed new plugs wires cap rotor, etc will give you alot better mileage also.
2007-03-20 14:56:01 · answer #2 · answered by ALLAMERICAN 3 · 0⤊ 0⤋
Could be the TPSensor is locked in on 5 volts or more making the injectors opperate full open.Could also be a diode burned out in the computor and 12 volts are running through your 5 volt system at the throttle position sensor.Vacuum leaks can also cause poor mileage( eg.a vacuum leak at the EGR valve.
2007-03-20 15:02:48 · answer #3 · answered by (A) 7 · 0⤊ 0⤋
i own a shop,and probably whats happening to it is its getting in need of a good tune up,since it did this gradually id say the plugs have about had all the miles they can get on them,id go through it and put new plugs and cap and air and fuel filter on it,you cant hurt it by tuning it up ,this should bring the mileage way back up on it,i do a lot of those in the shop ,those things will run till they almost drop dead,good luck i hope this helps.
2007-03-20 14:51:37 · answer #4 · answered by dodge man 7 · 0⤊ 0⤋
check tire pressure, if you use a/c a lot lately then that affects it. Driving in stop and go traffic, accerating like a maniac, very dirty air filter, or bad gas meter< you can check this by letting your car run out of gas and having an extra container of gas to fill in to see if they meter is the problem.
2007-03-20 14:52:30 · answer #5 · answered by Anonymous · 0⤊ 1⤋
Many things. Start with a tune-up. Check tiers for proper inflation. Dragging around any extra weight?
2007-03-20 14:48:41 · answer #6 · answered by robert m 2 · 0⤊ 0⤋
You have a high pressure fuel leak in the rail or injectors. Run it for a while in one place and see if you smell fuel
2007-03-20 14:52:17 · answer #7 · answered by Uncle Red 6 · 1⤊ 0⤋
plugged catalytic converter which should give off a bad rotten egg smell or could be bad o2 sensor which regulates the fuel mixture.
2007-03-20 14:54:17 · answer #8 · answered by jzbnkat 2 · 1⤊ 0⤋
my first tgought was , it needs a tune up. but it wouldnt make that much difference. this may sound crazy, but check and see if your emergency brake may be stuck on. wirth a try. had it happen to me.
2007-03-20 14:54:21 · answer #9 · answered by oldtimer 5 · 1⤊ 0⤋
here's a article on gas mileage that is interesting (I found it on ebay motors guides)
2007-03-21 10:59:49 · answer #10 · answered by rudy m 3 · 0⤊ 0⤋