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1996 Prelude Si - Terrible gas mileage, need help

 
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Old 05-21-2015, 08:07 PM
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Icon5 1996 Prelude Si - Terrible gas mileage, need help

So i recently got a 96 Prelude Si and at this point i have no idea what to do about this gas problem. I have a 15.9 gallon tank and after filling it full for about $40, i can maybe go 160 miles if im lucky. Usually more like 140. Its absolutely awful. I did a tune up 300 miles ago (plugs,wires,oil,filter). Also i just replaced the O2 sensors. The only big problem besides the terrible gas mileage and a hole somewhere in my exhaust, is a valve tick or lifter tick. I don't really know exactly. PS. i have an H23a1 engine (might be stock idk)

This car at the moment is a POS and i would love some insight from other Honda owners to see if maybe im not the only one with this problem, or what i can do to fix this issue. My last vehicle (96 Mustang GT 4.6L) got better gas mileage than the prelude gets.

Really appreciate you reading this and anyone that thinks they can help, please do so!

-Nate
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Old 05-22-2015, 12:06 AM
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Re: 1996 Prelude Si - Terrible gas mileage, need help

How bad is the exhaust leak and where's it at? If it's causing the O2 sensors to misread the emissions, that could be an issue. A catalytic converter that's on its way out would also effect the efficiency if it's becoming clogged.

Try a couple rounds of SeaFoam to see if it helps at all. Be sure to read instructions on how to use it, and maybe even try the several different methods available i.e. some in the gas tank, some in the oil, or some through the intake runners by applying through the brake booster hose.
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Old 05-22-2015, 11:00 AM
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Re: 1996 Prelude Si - Terrible gas mileage, need help

How much PSI are you running in your tires? And what size tires do you have?

I ask because I was getting like 22-23 MPG in my 89 driving "average" and several people said that they were getting 32... I was like No Way!

Anyways, I checked my tire pressure in my tires (Which Discount had put in) and they aired them up to 28 PSI... Just like on the door frame of the car... Which is great, if you have old school bias ply radials who's max PSI is 32 PSI...


My new tires (Falken 205/45/16's) say Max is 50PSI! I did some research and the recommended PSI is like 70-80% of the max, which would be somewhere around 37PSI. Guess what happened? I jumped right up to 28MPG... And my handling and ride quality got better as well!

Just an idea before you go buying ANY new parts or doing any unnecessary work to your car...
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96 prelude, gas mileage, h23a1, honda prelude, need help


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