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#1
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14mpg :-(
So my car started getting complete crap for mileage, and the check engine light came on. Pulled an o2 sensor code, so I replaced both oxygen sensors ($98/ea) and I'm still getting 14mpg, and developed an EGR code I know we have sh*t gas out here (damn ethanol) but any common problem areas I could check as to what would be killing my economy? I'm currently driving my truck cuz it gets roughly the same mileage and diesel is currently cheaper than premium...
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1992 SVX LS-L #1222 Pearl White 1987 GL Turbo wagon, 5 lug conversion, D/R 5 speed (Rice killer) 1992 Dodge Ram 4x4 diesel (car hauler) 1968 Dodge Polara convertible (Camaro killer) 1990 Toyota Corolla FWD auto (330,000 mile grocery getter) 1986 VW Jetta |
#2
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Re: 14mpg :-(
How old is your CTS? Mine wasn't giving a code, but was running rough on start-up. Changed the CTS and jumped 5 mpg.
Get the CTS right from Subaru!!!
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Dave - 03 Baja - 92 SVX - 86 Brat - 08 OB 3.0 |
#3
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Re: 14mpg :-(
What is a CTS and why did you change it if you didn't have a code for it?
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#4
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Re: 14mpg :-(
Coolant temperature Sender??
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#5
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Re: 14mpg :-(
Indeed. Even before it throws a code, it can be in bad enough shape to make starting the engine a challenge.
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Disclaimer: The above post is on the internet. |
#6
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Re: 14mpg :-(
Changed your air filter recently? How about spark plugs? Using the A/C a lot? Any one of these could contribute to your poor gas mileage.
(Point of Reference: I usually get 18-19, but can get down to 16 with a lot of A/C use and no highway miles)
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-Jason (8/23/07-Present) 1995 Subaru SVX LSi (197k) Polo Green (#1102) 03/95 Mods: DDM Tuning 4500k 35w Low Beam HID, 100w H3 Bulbs, Extra Ground Cables, 15 minute $12.96 mod, svxfiles designed transmission mount (), sporting a "new" tail light bar, silver BBS rims, custom power steering cooler (one that doesn't dump ATF constantly), new negative lead cable, no more third or fourth gear (1977-Present) 1977 Chevrolet Corvette (81k) Silver (12/01/2011-Present) 2005 Subaru Outback 2.5i Limited 5MT (97k) I have a bad feeling about this. -Obi Wan Kenobi |
#7
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Re: 14mpg :-(
Quote:
I feel for everyone on the "damn ethanol". When the "gestapo" started making the oil companies include 10%, our gas mileage dropped at least 10% Translation... it was at the very least of no value to us. Keith |
#8
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Re: 14mpg :-(
How is the 02 sensor code a "catch-all"?
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Cam '92 Ls-L Dark Teal 11:1 CR ECUTUNE pistons ECUTUNE .256 duration intake/exhaust cams ECUTUNE STAGE 2AV1 ECU Z32 MAF/SR20DET injectors Balanced & Blueprinted |
#9
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Re: 14mpg :-(
The code comes up frequently when nothing is actually wrong with the 02 sensors. This is pretty easy to prove when one or both 02 sensors are replaced after getting a code and the problem continues to exist and the same 02 cod is generated.
The computer wrongly gives an 02 code because it senses a problem in the system that would be the result of a bad sensor but is not an actual 02 problem... a seeping head gasket for one can cause this to occur. There are other things also and that is why I call it the "catch all" thingie. (probably not the technical name) Keith |
#10
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Re: 14mpg :-(
Ethanol in gas is a multi-purpose villain. I've run nothing in my cars but the cheapest no-name E10 swill and both get high teens around town and high twenties on the highway. The silver recently cracked 30 mpg for the first time. With AC.
dcb |
#11
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Re: 14mpg :-(
I got a new read on my MPG today and it was 22. That's about 50/50 city/hwy and some use of A/C. I have never gotten a read on pure highway.
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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 |
#12
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Re: 14mpg :-(
Twenty two is a good number. I started logging mileage closely when fuel prices spiked here in the wake of hurricane Katrina, and my average in both cars is 21-and-change. Most of my driving is pure grocery gettin'. Road trips come in consistently at 27-29 mpg.
Getting back to the topic, I'd disconnect the battery overnight, drive for awhile, record the mileage scrupulously, and see how it looks. Once I got a brief flicker of a CEL with an accompanying oxygen sensor code, did nothing, and the car probably runs better now than it did back then. dcb |
#13
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Re: 14mpg :-(
Quote:
What brand of O2 sensor did you buy? |
#14
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Re: 14mpg :-(
Talking of 02 sensors issues, I've got a strange one. Got 02 and knock sensor codes back from a CEL. Replaced them both all was good for 12 days then the 02 code comes back. Take it back to the dealer, new plugs (had 100km) and gaskets for the exhaust to insure no leaks. 13 days later 02 code again. Back to the dealer, he wants me to buy a new MAF, even though there is nothing to indicate there is a problem with it. They will not consider that perhaps they got a defective 02 sensor. The car drives perfectly with the CEL on, idles perfectly, not a single issue except I'm sick of seeing the CEL on every two weeks....any ideas as to where to start looking or should I just make the order another 02 senor and see if it comes back on?
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1996 Black, 134,000 KM, with Custom Stainless from Headers to Stebro, 17" Wheels, Michelin Pilot Sport PS2 225/45/17 Cold Air Intake. Pioneer AVIC D3 GPS/Video/Sound/Sirius/Bluetooth/USB Koni struts/ground control coilovers Stainless steel brake lines K&N filter, custom front grill H.I.D low beams 5000k 35w, H.I.D fog/driving 4500k 35w Clear front and corner lens |
#15
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Re: 14mpg :-(
Quote:
Good Luck & Cheers!
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' 92 SVX @ 185K ' 91 420SEL @ 223K! ' 88 420SEL I. @ 178K (what a buy!) ' 87 F250 @ 180K ' 93 ZX-11D @ 29K ' 93 SC400 @ 93K 2001 Valkyrie Interstate @ 6.6K (Brynhild) Y2K NightHawk 250 @ 1,500 miles ' 88 420SEL II. @ 208K '85 F150 @ 135K |
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