Gas mileage issues?
Nov 26, 2018 | 01:41 PM
#1
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From: Idaho
Gas mileage issues?
Hey guys new to yota tech! I’m running an 88 4Runner with the 22re and I’m getting awful fuel mileage wondering if anyone has any suggestions, currently running 32-11.5 mud tires with a freshly rebuilt engine and I’m consistently getting 10 MPG, I’ve gone through and redone damn near everything under the hood too, all the filters, got a cleaned intake manifold and free flow exhaust with a header with the rebuild, and put high performance injectors on it as wel. Not a significant power increase so I can’t see that causing the huge jump in mileage I was getting about 15 before and I romped on it, and like I said I’m getting ten now keeping my foot out of it. New computer, ignition coil, plugs, plug wires, distributed cap and rotor, and the ignition control unit as well, pretty much the only thing on the fuel side of things that isn’t new is the fuel pump, also got a new oem o2 sensor, the only thing I can come up with is the AFM but it seems to be functioning fine so any suggestions would be greatly appreciated, thanks guys!
Nov 26, 2018 | 01:52 PM
#2
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From: Southern Arizona
What do the spark plugs look like after a hundred or two miles run at speed??? Has it got the correct thermostat installed???
Have you tested the temp sensor that instructs the ECU to go into closed loop when the engine is up to temp??
Have you tested the temp sensor that instructs the ECU to go into closed loop when the engine is up to temp??
Nov 26, 2018 | 02:26 PM
#3
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From: Idaho
Haven’t noticed anything wrong with the plugs but I’ll check them again tonight, the thermostat is new as of last year when it was rebuilt and it was professionally done, I actually don’t know anything about that temp sensor you mentioned��
Nov 26, 2018 | 03:27 PM
#4
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From: Southern Arizona
Examination of the plugs after a run at speed will give indication of how rich the engine is running..
Both the cold start injector timer and the temp sensor of which I spoke are found under the air intake at the front of the plenum.
Look at the FSM and know thy truck.
Both the cold start injector timer and the temp sensor of which I spoke are found under the air intake at the front of the plenum.
Look at the FSM and know thy truck.
Nov 27, 2018 | 09:35 AM
#5
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From: Northern Colorado
Is this mileage decrease after you changed the tires from stock? Are you accounting for the odometer error with the bigger tires? I believe stock tires on that vehicle would have been about 29 inches in diameter. Going to a 32 is a 10% change right there and will cause your odometer to read low by that amount. Plus...
- heavier tires cost you mileage (more weight to spin up)
- more aggressive tread costs you mileage (more air and road resistance)
- Stiffer sidewalls (Load range E?) cost you mileage (more heat losses when the sidewall flexes).
Finally, the bigger tires mess up your gearing so your engine is not running in its sweet spot as much. Another mileage hit.
- heavier tires cost you mileage (more weight to spin up)
- more aggressive tread costs you mileage (more air and road resistance)
- Stiffer sidewalls (Load range E?) cost you mileage (more heat losses when the sidewall flexes).
Finally, the bigger tires mess up your gearing so your engine is not running in its sweet spot as much. Another mileage hit.
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