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#16
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Relax man, I was just kidding with you. Nothing wrong with stepping on the gas, I do it every time I drive. I just don't expect my gas mileage to be good when I'm hammering on the car. If I run through a tank hot rodding around the whole time I'd get around 16-17mpg. I used to drive like that all the time when I first bought the car and I have logged my gas mileage since I bought the car. Not really because I care about the mileage, more so I can tell if something has gone wrong.
Now I get around 19-22 mixed city driving with about half of the time spent racing around and 26-27 highway. 10 mpg is pretty low. They could have screwed up the plugs by not gapping properly but I expect you'd have some roughness in the engine. I'd also check air filter, all the vacuum connections, 02 sensors, and make sure the intake boot is on tight and also the intake itself is bolted down tightly. Do you have alot of black soot in your tailpipe? Have you ever had a CE light? Maybe your crooked dealer pulled the bulb out and you don't know its throwing a code. Have you tried a good fuel system cleaner?
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. |
#17
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I drive highway any where between 65-80 mph and have never got above 21 mpg.
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96 Red SVX 96,000 miles 02 Toyota Highlander 02 Nissan Altima 04 VW Beetle GLS |
#18
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Ron.
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Good s**t happened. 69 was worth the wait. '92 stock semi-pristine ebony - 160K '96 Grand Caravan - 240K '01 Miata SE - 79K '07 Chrysler Pacifica - 60k - future money pit. |
#19
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I find that after the work i have just done i have doubled my fuel economy- plugs, airfilter, fuel filter, oil and filter, atf and filter, coolant temp sensor, and other thing that wouldnt change economy. |
#20
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Alan 1987 928 S4 (Black) SOLD! 1997 SVX LSi (Ebony) SOLD! 2005 Legacy GT (Silver) [Cobb Stg 2+] SOLD! 1987 928 S4 (Black) SOLD! 2005 Forester XT Premium (Crystal Gray Metallic) SOLD! 2008 Lancer Evolution X MR (Apex Silver) [Cobb Stg 1+] 2015 Outlander Sport 2.4GT AWD (Mercury Gray) 2013 G37xS (Obsidian Black) |
#21
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You said something VERY interesting...yes, I have TONS of black soot out the tailpipe. I cleaned them good, and 2 weeks later, its like all back again! You can't see it coming out, but yes, I get the deposits like crazy. What does that mean? |
#22
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It must be them thar hills because I've done everything in my power to maintain this like it cost me $36,000.00 and still 21mpg is the best it's ever done.
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96 Red SVX 96,000 miles 02 Toyota Highlander 02 Nissan Altima 04 VW Beetle GLS |
#23
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You should always check the gap before installing plugs. They are factory gapped platinums when you get them at the dealer but it only takes a small tap or drop to close the gap up. I dropped a plug once before putting it in an astro van and believe me, it was running on 5-6 cylinders until I found out which plug it was. Weird thing was the van felt more powerful than ever. Maybe beav could explain why. If you've ever even seen under the hood on one of these you'd learn the lesson I did. Changing the svx plugs was easy in comparison. I agree you shouldn't run cheap plugs but I have never tried the bosch +4, I just go with the factory platinums.
I drive through VA and WVA right over the hills about 6 times a year and I still manage 26mpg through there doing a steady 75-80mph but that is with only 1 or 2 stops during a tank. Now if thats 45-70mph driving in hills, you're gonna spend alot of time with the TC unlocked and doing alot of downshifting and that will definitely drop the mileage down. I try to always go fast enough to keep the engine above 2600 rpm when I am coming up to a hill so that the car has enough power to go right up without unlocking the torque converter. If I am only going around 60-70 I won't make it up the big hills without the TC unlocking and possibly a downshift. On an 800 mile trip it makes a difference. I have never hit 27 mpg but my wife has once on the same trip driving my car so I am on a never ending quest to beat that. I still don't know how some people here get 30mpg. Excessive black soot in the tailpipe indicates you are running a rich mixture. You're burning more gas than you should be. This could be due to a number of different things. Some black soot is normal. You can pull out your spark plugs and check their condition to see how your engine is running. They have pictures in the back of most chiltons manuals that will show you how to read a plug.
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. |
#24
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Help! My mileage has fallen and it can't get up!
My mileage sucks also and it is running rich from the looks of the tail pipe. The air filter is clean. I will have to pull my plugs and have a look at them. What is the best way to get to them? I've never changed them and it looks extremely tight on space from above. I've heard someone say that they are easier to get to from underneath. Is this true? Any suggestions would be appreciated. I can't believe the crappy mileage I get compared to some of you. Would clearing the computer make a difference if the prior owner didn't run premium fuel?
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Pearl '92 LS-L 179K (Historic 1st 5-speed SVX) Mods: 5-speed, 4.11's, Group-N motor mounts, dual Magnaflows, cone air filter, Kenwood MP-228 CD/Receiver, white-faced gauges, '97 grill, custom window tinting. Ebony Mica '92 LS 80K Oct 2002 - Dec 2004: Victim of theft. She served me well. You can tell the lack of craftsmanship by the wrinkles in the duct tape. |
#25
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I did all of the plugs from the top with a ratched and a couple different sized extensions. Some people remove the plug in the wheel well but it isnt necessary. Main thing to remember is patience. Take it easy, if you start swearing then step back and look at it from a different angle. They are a PITA to take out until you figure out the 'trick' for each one. You have to finesse the plugs out.
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Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. |
#26
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All I know is that NOTHING can be as bad as my 68 Charger 383's engine. Why? EGAD those headers sucked. There was one plug wher eyou literally couldn't fit a socket onto it. ACK.
- Ca$h |
#27
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Then it must be Fester's Exxon & Road Kill Kuisine station. Maybe he's done some West Virginny math back at the pump flow control to help pay the mortgage on the doublewide. Seriously - the car should get AT LEAST 26-28 mpg over the road, or you got one of them 3 speed models. Ron.
__________________
Good s**t happened. 69 was worth the wait. '92 stock semi-pristine ebony - 160K '96 Grand Caravan - 240K '01 Miata SE - 79K '07 Chrysler Pacifica - 60k - future money pit. |
#28
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David B. SVXipedia @ SVX-IW.COM -- SVX Information Warehouse 2.0 coming...eventually! Ebony 1992 SVX LS-L 5 spd Koni/GC Stebro 187k miles RIP (Rust In Pieces) 1993 SVX 5 spd Koni/GC Stebro Polyurethane bushings still available! |
#29
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