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#1
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Poor gas mileage.
Hi guys. My '97 with 85K on it gets 17 MPG on the same commute that my '96 used to get 21 MPG on. The car runs great and the CEL is not on. Does anyone have any suggestions on how to go about investigating a problem like this? Any help is appreciated.
Chip. |
#2
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Re: Poor gas mileage.
Check to make sure you don't have a sticky caliper. I got around 21 with mine until one of the calipers slowly started sticking. I watched the mileage drop to 17 over about 4 months before I realized what the problem was.
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Glen SOLD - 1992 LSL 180K #8588 with svxfiles' all aluminum radiator; Wolf's head synthetic ATF in tranny and power steering; lighted power mode switch; Mobil 1 10W30 motor oil with Bosch 72158 filter; ACDelco A975C air filter; Valvoline synthetic 75W-90 gear oil, Optima BlueTop battery 2002 F550 74K SOLD - 2000 F450 215K 1987 BMW 535i 209K 1999 Yamaha SRX 700 |
#3
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Re: Poor gas mileage.
I get nearly 14 MPG in my 92 pearly.. Its terrible.
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1992 Pearl White LS-L "Ruslana" #4946 - 180k on body, 95k on engine. Mods: ECU bead crush, 15 min mod, 20 min mod, drilled/slotted rotors & Axxis ceramic brakes, SS lines, 17" Evoke F1 wheels, XS-HF137 Sony Xplod speakers, 6000k HID's (lows & fogs), resistor mod, 1½" Sleek Spoiler mod, custom exhaust by svxfiles, '02 WRX aluminum racing radiator by svxfiles, Summit Racing 400# x 300# springs w/ Koni's by svxfiles, ClassGlass fiberglass hood /w scoop, Nevin's rear sway bar, '97 grille, phenolic spacers, custom LED interior lighting, custom paint. †"War doesn't determine who is right, only who is left"† Work to be done: Tinted windows, clear/LED tail lights, tailbar mod, "Power Mode" mod, Supertone horns, clear corners & headlight lenses, 2 pc splitters or custom bumper, Alcyone side skirts, TruSpeed Stage III SVX Intake, Hydra, 4.44 tranny swap, JDM auto folding side mirrors, engine rebuild, super charger, STi seats, bone leather interior /w SVX emblem, dash overhaul, SVX decals, paint (stock color). Total cost?: 22k At least it's going down..
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#4
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Re: Poor gas mileage.
Quote:
In 100% commuter mode, I've found 17-19 MPG is about the best either of mine has to give. dcb |
#5
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Re: Poor gas mileage.
Thanks for the help. It runs so well that I think I will check the calipers first.
Chip. |
#6
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Re: Poor gas mileage.
I cosider 17 in town pretty good. Of course what you call in town and what call in town can be two different things ( 6 traffic lights a mile or down town NY city or a rural town in Kansas ) I shift 21 times going to work and it is just under 2 miles.
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#7
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Re: Poor gas mileage.
Check the fuel delivery system too.
For example, if you've got a fuel pressure regulator on its way out (rubber diaphram perishing), it could be wasting fuel through that. |
#8
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Re: Poor gas mileage.
Could that cause a lot of gurgling noises when the car is first started? How does one check the FPR?
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Tony 1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads 2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil 2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil 1992 Red Ferrari 348 ts, 82,XXX, Redline everything |
#9
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Re: Poor gas mileage.
the gurgling (if it is coming from the back seat area) is probably just the fuel pump. if you pull the vacuum line off the pressure regulator then you should be able to tell if it is leaking. the line will be wet inside, apply vacuum with a clear hose to be certain. when the diaphragm ruptures it allows fuel to be sucked into the vacuum hose.
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Current Stable: 1992 SVX 1979 K5 Blazer Cheyenne 1956 Plymouth Belvedere - Daisy 1967 Chevy C20 1953 Chevy 210 1969 Plymouth Satellite 1949 Chevy Thriftmaster 1959 Chevy Apache 1951 Chevy Stepside 1969 Chevy Camper Special 1978 Ford F150 w/ stroked 460 1986 Volvo 740 turbo wagon 1999 GMC 2500 Creep Van 1994 Impreza Outback |
#10
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Re: Poor gas mileage.
I previously had a 1:1 KM/L but now have about 1.2L per 10km.
It's a sticky caliper (FR). Teh pads look very and clean there!
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I got my girl, I got my glass, I got my car and I'm ready to f... |
#11
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Re: Poor gas mileage.
Thanks everyone.
The left front caliper was binding, and the right front caliper, while not binding, had a bad (frozen) piston. Now to see what my mileage rises to. BTW my commute is 12.5 Mi. It is ~2/3 Freeway. but for comparisons, my '96 got 20.5 to 21 MPG on that route. It had 213K, and I expect that from my '97 with 88K. Chip. |
#12
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Re: Poor gas mileage.
Ironically, I didn't have a caliper issue
Must be the bad bearings.
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I got my girl, I got my glass, I got my car and I'm ready to f... |
#13
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Re: Poor gas mileage.
I once had a collapsing brake hose . When you applied the brake it would expand and when you released the pedal it would slowly resease the caliper.
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#14
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Re: Poor gas mileage.
Oh yes I tried nudging Sicksubie for those
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I got my girl, I got my glass, I got my car and I'm ready to f... |
#15
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Re: Poor gas mileage.
mine has the same problem and does about 13-15 MPG
I'm pretty sure it has something to do with the spark plugs and the slightly warped brake rotors...gotta replace those but when it was healthy i could get 22-23 highway MPG which is respectable...
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DIY FTW! 1993 SVX 25th Anniversary Edition @+142k -Rebuilt Tranny @135k -Regasketed Engine @140k -Enkei Raijin 18x8.5, with 255/35/18's @140k -BC racing Coilovers (From STI's) @142k |
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