1991 Honda CRX Dx has low MPG - Fuelly Forums

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Old 04-16-2012, 11:19 AM   #1
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1991 Honda CRX Dx has low MPG

I have a '91 with 145,000, my dad has a '90 with 75,000. He get 38+ I get 28 mpg.

My plugs and leads, ignitor, fuel and air filter are new, where should I look next for the gas hog? I recall having a vacuum gauge will help in isolating some parts failures in fuel delivery?
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Old 04-16-2012, 03:01 PM   #2
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Re: 1991 Honda CRX Dx has low MPG

thermostat, dragging brake(s), O2 sensor, cap and rotor, wheel bearing(s), leaky injector...

try a fuel system cleaner as well...amsoil PI, seafoam, or even just several ounces of acetone.

also driving styles differ...if your dad drives less aggressively or more highway miles well...

what about transmissions? if his is a manual(and yours auto) or he has the HF model then...
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Old 04-17-2012, 04:24 AM   #3
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Re: 1991 Honda CRX Dx has low MPG

Big heavy wheels/tires will also lower your mpg, especially with stop and go (city) driving.
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Old 04-19-2012, 07:13 AM   #4
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Re: 1991 Honda CRX Dx has low MPG

Thank you-forgot to mention both are manuals-never have had an automatic-tried SeaFoam, use Mobil1 in mine Redline in his, have similar driving habits, 13 inch on his 14 on mine both are narrow cross section tire, new cap/rotor on both, good bearings throughout, new 02 sensor on mine, non leaking injectors too.
I have a rebuilt pair of injectors-can I install them and reuse the keeper plates? Or is that a new item only replacement when you change out your injectors?

Any preferences for clutch brands when replacing?
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Old 04-19-2012, 02:33 PM   #5
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Re: 1991 Honda CRX Dx has low MPG

Not sure on the keeper plates- if there is an o-ring seal then it is a good idea to replace the o-ring.

I like just about any clutch brand that has a lifetime warranty -but if it was a whole clutch set (pressure plate and disk and bearing) for $50, I'd probably be suspicious that it was junk.
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