Why does my mileage still suck?
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Why does my mileage still suck?
Just looking for ideas on why I am still only getting 10mpg town and 15mpg highway with my 4runner. Check the list below for all the stuff I've tried. None of it has helped (but at least its good maintenance). Anyway, just wondering if you guys can think of anything I've overlooked.
Vehicle Specs: 95 4Runner, 3.0L, A340H (auto tranny), 4.88 gears (stock), 31X10.5 tires, Downey coils in back.
What I've tried:
1) Semi-Synth lube everywhere (oil, tranny, T-case, front bearings, difs, driveshafts, balljoints)
2) New plugs, cap, fuel filter, air filter, timing belt, drive belts, PCV
3) Timing at 10 deg. BTDC
4) Cleaned out intake manifold, and TB
5) 2 cans Berryman FI cleaner over the last year. One can of motor flush during last oil change
6) 93 octane (helps a little)
7) Swiss cheese airbox.
8) high flow muffler w/ 2.25" pipe from cat back
9) Checked EGR and modulator (both OK). Checked cat (not plugged)
10) Tires at 45 psi.
11) Very easy driving (i.e. no lead foot, slow accelerations, N at stop lights, etc).
12) All wheels rotate fine by hand when not engaged (i.e. no binding or rubbing of brake pads)
13) Warn hubs up front
Vehicle Specs: 95 4Runner, 3.0L, A340H (auto tranny), 4.88 gears (stock), 31X10.5 tires, Downey coils in back.
What I've tried:
1) Semi-Synth lube everywhere (oil, tranny, T-case, front bearings, difs, driveshafts, balljoints)
2) New plugs, cap, fuel filter, air filter, timing belt, drive belts, PCV
3) Timing at 10 deg. BTDC
4) Cleaned out intake manifold, and TB
5) 2 cans Berryman FI cleaner over the last year. One can of motor flush during last oil change
6) 93 octane (helps a little)
7) Swiss cheese airbox.
8) high flow muffler w/ 2.25" pipe from cat back
9) Checked EGR and modulator (both OK). Checked cat (not plugged)
10) Tires at 45 psi.
11) Very easy driving (i.e. no lead foot, slow accelerations, N at stop lights, etc).
12) All wheels rotate fine by hand when not engaged (i.e. no binding or rubbing of brake pads)
13) Warn hubs up front
Last edited by szf2; 08-22-2003 at 08:00 AM.
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Originally posted by <96 Runner>
I did not see O2 sensor replacement on that list.
I did not see O2 sensor replacement on that list.
Just one thing that i know of tha tyou forgot to replace.... your 3.SLOW...
Last edited by szf2; 08-22-2003 at 08:36 AM.
#6
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Here's a question for you. Do you drive with the windows up or down. Windows down cause alot of drag believe it or not, and will cause poorer mpg than driving with the AC cranked up.
Also have you adjusted your TPS?
Also have you adjusted your TPS?
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Windows rolled up, down, with A/C on, with A/C off, with some part-time wheelin in there; I can't say I've EVER seen a noticable difference in my gas milage while I've done any of the above combinations. But my experiences is with a 96' V6, so I don't know.
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#8
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Check your AFM. That caused my poor city mileage
As for the windows, another good thought. They are down around town (speeds under 40mph) and up on the highway (with AC on). As for the TPS, I have had it apart but haven't really adjusted it (didn't know that was possible). I will have to look into it. Thx.
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I see you cleaned out the intake manifold & TB, do you have a MAF as well? Is that cleaned?
On a side-note, my mileage dropped between 1 - 2 mpg when I had my muffler installed. Don't know if it was just coincidence or what but thought I'd mention it. My mileage has improved since I cleaned my MAF and TB a few days ago, as well as put in a paper filter (so I could remove my Amsoil one for cleaning).
On a side-note, my mileage dropped between 1 - 2 mpg when I had my muffler installed. Don't know if it was just coincidence or what but thought I'd mention it. My mileage has improved since I cleaned my MAF and TB a few days ago, as well as put in a paper filter (so I could remove my Amsoil one for cleaning).
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Originally posted by szf2
Good thought. I have made sure the flapper valve (or whatever its called) moves freely plus sprayed some lube on it. It does rattle a bit, but seems to work OK.
Good thought. I have made sure the flapper valve (or whatever its called) moves freely plus sprayed some lube on it. It does rattle a bit, but seems to work OK.
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Originally posted by 4runner4life
Windows rolled up, down, with A/C on, with A/C off, with some part-time wheelin in there; I can't say I've EVER seen a noticable difference in my gas milage while I've done any of the above combinations. But my experiences is with a 96' V6, so I don't know.
Windows rolled up, down, with A/C on, with A/C off, with some part-time wheelin in there; I can't say I've EVER seen a noticable difference in my gas milage while I've done any of the above combinations. But my experiences is with a 96' V6, so I don't know.
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Check your AFM. That caused my poor city mileage.
No, you have to go through the electrical tests outlined in the factory service manual (I think chiltons or haynes has it too). Becareful because it's real easy to break the afm and a new one is around $700.
Again, though, great input. The more the better!
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Originally posted by szf2
So you checked your afm and it was OK but cleaning out the internals helped your mileage OR you replaced the entire afm b/c you found out it was bad? Just wondering b/c even if I test mine and it is bad, $700 could buy ALOT of gas . Maybe more than I would gain by replacing the afm (at least in the short term of a few years or so).
So you checked your afm and it was OK but cleaning out the internals helped your mileage OR you replaced the entire afm b/c you found out it was bad? Just wondering b/c even if I test mine and it is bad, $700 could buy ALOT of gas . Maybe more than I would gain by replacing the afm (at least in the short term of a few years or so).
Sure you can buy a lot of gas with $700, but think about what is happening. If you're using more gas then you're probably running rich. This could lead to carbon deposits, O2 sensor problems, cat problems, emissions problems, etc.
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Are you sure that you have 4.88 gears? I've read that only 4 cylinder autos with 31" tires came stock with 4.88's, and v6's with 31" tires *usually* came with 4.56's.
Granted, I have a 3rd gen and know nothing about 3.0's, but the stuff I reference was from this site.
Granted, I have a 3rd gen and know nothing about 3.0's, but the stuff I reference was from this site.
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Are you sure that you have 4.88 gears?
Finally, here is a picture of the model info sticker I snapped back when I was trying to figure it all out:
Last edited by szf2; 08-22-2003 at 12:28 PM.
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Originally posted by jjdeneen
did you check the flux capacitor????
did you check the flux capacitor????
It seems like you've covered all the bases to improve you mileage, I would try cleaning your MAF sensor real good and hope for the best. How are you calculating you MPG? Are you sure you are doing it right? I'm not bashing you at all, but sometimes people don't really know how to calculate their mileage(I didn't in the beginning).