Gas Mileage and power loss
Gas Mileage and power loss
'93 MX3, 1.6l, 5spd.
167k miles
Recently at highway speeds the rpm's would drop, then rpms would rise back to where they were and the car would obviously jerk. I cleaned out the tb, changed spark plugs/wires, dist. cap/rotor. Everything seems to run fine now, but I noticed that it seems to have lost a little bit of power and my gas mileage has also went down from 27/town - 32/highway to about 24/town - 27/highway. Anybody have any ideas what would have caused this? The only thing I could think of is the spark plugs were NGK brand with the fancy little platinum tips that you can't gap.
Only odd thing i've noticed otherwise is: When the car is started up and it's very cold outside, I can hear a whistling noise if I push on the gas a little. The noise increases with RPM's so maybe a vacuum leak is to blame. (NOTE:whistling noise goes away once the car is warmed up)
Any ideas are appreciated
167k miles
Recently at highway speeds the rpm's would drop, then rpms would rise back to where they were and the car would obviously jerk. I cleaned out the tb, changed spark plugs/wires, dist. cap/rotor. Everything seems to run fine now, but I noticed that it seems to have lost a little bit of power and my gas mileage has also went down from 27/town - 32/highway to about 24/town - 27/highway. Anybody have any ideas what would have caused this? The only thing I could think of is the spark plugs were NGK brand with the fancy little platinum tips that you can't gap.
Only odd thing i've noticed otherwise is: When the car is started up and it's very cold outside, I can hear a whistling noise if I push on the gas a little. The noise increases with RPM's so maybe a vacuum leak is to blame. (NOTE:whistling noise goes away once the car is warmed up)
Any ideas are appreciated
Re: Gas Mileage and power loss
Funny as I was adjusting the Idle the more I screwed out the screw the more whistling sound I got from my CAI. Sounds like you could have a vac leak. You could also try putting the car in diag. mode and re adjusting your idle. Take the screw right out make sure it's clean screw it back in gently reseating it then screw it out to the original point start the engine and when warm adjust your idle.
2004 Subaru WRX Silver, stage 2, minty interior.
2002 Subaru WRX Blue, SOLD (best E test numbers I've ever seen)
94 MX-6. Sold
92 GS KLZE 5 Speed
96 GS 5 speed, KLZE, Sold
95 GS Minty Shape Sold
92 GS Sold
92 GS Parts Car scrapped.
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7477th member.
I know you believe that you understand what you think I said but I'm sure you realize that what you heard is not what I meant.
2002 Subaru WRX Blue, SOLD (best E test numbers I've ever seen)
94 MX-6. Sold
92 GS KLZE 5 Speed
96 GS 5 speed, KLZE, Sold
95 GS Minty Shape Sold
92 GS Sold
92 GS Parts Car scrapped.
Feedback viewtopic.php?f=37&t=66348" onclick="window.open(this.href);return false;
7477th member.
I know you believe that you understand what you think I said but I'm sure you realize that what you heard is not what I meant.
Re: Gas Mileage and power loss
What should the idle be set to?
- Ryan
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Re: Gas Mileage and power loss
Dude, it says on the underside of your hood.
Now with Moderator power!
Black '93 BP RS - wrecked, parted, scrapped.
Green GS - Sold.
Black GS - Summer DD/Race car - Fancy KLZE
Red GS - K8-ATX -> MTX-KLDE - Frakencar. Scrapped
White GS - Rusty. Parts. Scrapped
1997 BMW M3 - my summer baby
2002 BMW 325Xi - sold
2003 Forester Xti - EJ20K swapped.
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Black '93 BP RS - wrecked, parted, scrapped.
Green GS - Sold.
Black GS - Summer DD/Race car - Fancy KLZE
Red GS - K8-ATX -> MTX-KLDE - Frakencar. Scrapped
White GS - Rusty. Parts. Scrapped
1997 BMW M3 - my summer baby
2002 BMW 325Xi - sold
2003 Forester Xti - EJ20K swapped.
Feedback
Re: Gas Mileage and power loss
Well Ryan...thanks for the answer.
Guess any form of information is acceptable...
Guess any form of information is acceptable...
- fowljesse
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Re: Gas Mileage and power loss
I don'r know about your particular area, but around here, they switch to Ethanol in the winter, and it SUCKS. Worse performance, and gas mileage.
'93 GS - P&P DE w/ ZE exh. cams/ pistns, KLG4 IM, 65mm TB, MSnS, Phenos, K&N RAI, UDP, Grnd wires, rear batt, filld MM, torq strt, TWM short shftr, Exedy, Lng tube hdrs 2.5" Side exhaust, H&R sprngs, Poly bushngs, strutbars, Alum. crss mmber&tiebar, 22mm swybar, solid links, Direzzas, leather int, Alpine 9805 stereo & alrm, keyless entry, 10 Boston Accoustics spkrs, Prjectrs, Blaster2, CF hood, FG hatch, Lexan
Re: Gas Mileage and power loss
I'm 2 hrs away visiting my g/f at college so I have no clue what they do in this town. I'll have to check it out at the pumps.
- fowljesse
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Re: Gas Mileage and power loss
I'm not used to this. I've never lived where I couldn't find a non Ethenol station. I pay attention to evey fill up, and one day, outta nowhere, 26mpg, instead of 30. I thought something was wrong with my car, as I had also noticed it being slightly sluggish.. Then I saw the sing "Contains up to 10% Esthaintol"
'93 GS - P&P DE w/ ZE exh. cams/ pistns, KLG4 IM, 65mm TB, MSnS, Phenos, K&N RAI, UDP, Grnd wires, rear batt, filld MM, torq strt, TWM short shftr, Exedy, Lng tube hdrs 2.5" Side exhaust, H&R sprngs, Poly bushngs, strutbars, Alum. crss mmber&tiebar, 22mm swybar, solid links, Direzzas, leather int, Alpine 9805 stereo & alrm, keyless entry, 10 Boston Accoustics spkrs, Prjectrs, Blaster2, CF hood, FG hatch, Lexan
Re: Gas Mileage and power loss
Drove all over town and can't find anywhere that's not "enriched" with ethanol. I just went ahead and filled up with 89 instead of 87 since it's "supposed" to have less. Doubt it's worth the extra 10 cents per gallon but oh well.
As far as the idle speed, I can't find anything under the hood that has it. Sticker evidently fell off.
As far as the idle speed, I can't find anything under the hood that has it. Sticker evidently fell off.
Re: Gas Mileage and power loss
There are only a few gas stations that are not mixed with ethanol now.
Most BP's in TN and AL are all 10% ethanol
Just about all gas stations in my county are 10% ethanol
The only place I can get 0% ethanol is a tiny little PURE station on the georgia border.
It sucks
Most BP's in TN and AL are all 10% ethanol
Just about all gas stations in my county are 10% ethanol
The only place I can get 0% ethanol is a tiny little PURE station on the georgia border.
It sucks
Re: Gas Mileage and power loss
Anymore ideas folks?
Re: Gas Mileage and power loss
If you still have the original 16 year old O2 sensor - it might be time to change it....
Re: Gas Mileage and power loss
Also, you might want to adjust the ignition timing.
It's possible your injectors are gunked up... I would suggest running some cleaner, maybe seafoam or lucasoil...
But if there is a serious issue with the injectors, they'd have to be removed and professionally cleaned.
Double quadruple quintuple check your vacuum, pay attention to the accordian tube.
... and change your air filter if you haven't done that
I super suggest changing your O2 sensor as well.
It's possible your injectors are gunked up... I would suggest running some cleaner, maybe seafoam or lucasoil...
But if there is a serious issue with the injectors, they'd have to be removed and professionally cleaned.
Double quadruple quintuple check your vacuum, pay attention to the accordian tube.
... and change your air filter if you haven't done that
I super suggest changing your O2 sensor as well.
- fowljesse
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- Joined: March 17th, 2006, 2:59 pm
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Re: Gas Mileage and power loss
D) All of the above.
A major tune-up would be good. Alot of injector cleaners are mostly Acetone. Try 2¾ oz. Acetone per tank (You can get it @ Home Depot, or any hardware store). It also relaxes the tension between gas molecules for better atomization. You'll get better gas mileage, anyway.
A major tune-up would be good. Alot of injector cleaners are mostly Acetone. Try 2¾ oz. Acetone per tank (You can get it @ Home Depot, or any hardware store). It also relaxes the tension between gas molecules for better atomization. You'll get better gas mileage, anyway.
'93 GS - P&P DE w/ ZE exh. cams/ pistns, KLG4 IM, 65mm TB, MSnS, Phenos, K&N RAI, UDP, Grnd wires, rear batt, filld MM, torq strt, TWM short shftr, Exedy, Lng tube hdrs 2.5" Side exhaust, H&R sprngs, Poly bushngs, strutbars, Alum. crss mmber&tiebar, 22mm swybar, solid links, Direzzas, leather int, Alpine 9805 stereo & alrm, keyless entry, 10 Boston Accoustics spkrs, Prjectrs, Blaster2, CF hood, FG hatch, Lexan
Re: Gas Mileage and power loss
I've ran a couple bottles of injector cleaner through the car within the last few months, and i've also used Seafoam. I did a tune-up very recently, less than 3k miles ago. Air filter was changed around 10k miles ago. It snowed tonight and it's only supposed to be 3 degrees tomorrow but i'll change the o2 sensor when the weather clears up. I'll also check around for vacuum leaks.