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veach
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(Need a Spot)
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03/20/07 07:40 PM
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really bad gas mileage!!!!
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i just got done rebuilding my 86 4runner it has a 22re in it and today i drove it. it had a half tank of gas in it i drove probly about 80 miles and now it is down to empty once again. i think it might be a problem with the air fuel mixture but i am not sure. and if that is the problem i dont know how to remedy it. if u have any ideas please let me know thanks
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Re: really bad gas mileage!!!!
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Check to make sure you don't have any leaks in the fuel tank/fuel lines. Also, could your gas gauge just be giving you a bad reading? It's best to start of with simple things, mostly since I'm a carbie and I don't know much about EFI 
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hdrisc
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(Getting the Wheeling Fever)
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03/20/07 10:02 PM
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Re: really bad gas mileage!!!!
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A dirty air filter will hurt your fuel mileage also.
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Re: really bad gas mileage!!!!
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Was this something that happened suddenly or over time?
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Re: really bad gas mileage!!!!
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Any codes?
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Re: really bad gas mileage!!!!
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I only get 220 km when I am driving off road, and 270 km when I don't. That does sound about right, doesn't it? Or do I am something wrong too????
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bkg
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(Roll Me Over)
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03/21/07 09:42 AM
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Re: really bad gas mileage!!!!
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Quote:
i just got done rebuilding my 86 4runner it has a 22re in it and today i drove it. it had a half tank of gas in it i drove probly about 80 miles and now it is down to empty once again. i think it might be a problem with the air fuel mixture but i am not sure. and if that is the problem i dont know how to remedy it. if u have any ideas please let me know thanks
Define "just got done rebuilding...." Does that mean the engine, the entire truck? Missing information here.
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Staceman
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(Body Damage is Cool)
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03/21/07 10:13 AM
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Re: really bad gas mileage!!!!
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How old is the o2 sensor? A defective one will cause the motor to run a richer mixture, therefore, dumping more fuel into the engine.
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CJM
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(Body Damage is Cool)
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03/21/07 10:53 AM
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Re: really bad gas mileage!!!!
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welcome to the 300 club 
mine also is in the same boat .. I use to get 400 per tank , untill I burnt a valve . I ended up driving it for quite awhile before repairing , but when I finally did (rebuilt complete engine )
I have replaced everything , including new o2 sensor , throtle body, rebuilt injectors , temp sensors .. actually , its easier to say what I havent replaced ..
computer
air flow meter
i'm on stock size tires , with only a canopy .
I just did a new exhaust as well , and now my tail pipe is black , and also i'm getting some back firing when coasting down hill .. It , is absolutly running rich , and i cant figure it out 
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89PU
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(Getting the Wheeling Fever)
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03/21/07 06:26 PM
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Re: really bad gas mileage!!!!
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How's the fuel pressure?
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hdrisc
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(Getting the Wheeling Fever)
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03/21/07 07:16 PM
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Re: really bad gas mileage!!!!
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incorrect timing will also decrease mileage
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CJM
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(Body Damage is Cool)
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03/21/07 07:46 PM
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Re: really bad gas mileage!!!!
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Quote:
How's the fuel pressure?
I didnt think fuel perssure was an issue ??? ( I could be wrong) but that is what the return line is for ? ..
thinking it could be a "leak down" proplem .. I also replace the cold start injector .
Quote:
incorrect timing will also decrease mileage
timing is right on .
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canuck
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(Wheeler)
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03/21/07 08:17 PM
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Re: really bad gas mileage!!!!
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What about the TPS adjustment then followed by the timing. This was my problem when running rich. Also caused my cat to plug up.
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CJM
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(Body Damage is Cool)
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03/21/07 08:29 PM
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Re: really bad gas mileage!!!!
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have followed the steps to set up in in manual ..
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veach
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(Need a Spot)
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03/21/07 08:59 PM
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Re: really bad gas mileage!!!!
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ok when i said rebuild i ment just a engine rebuild and the question about if it happend suddenly or over time the answer to that is it happend suddenly because i was gettin better gas mileage before i rebuilt it. but thank u guys very much for your info i will let u know what works
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89PU
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(Getting the Wheeling Fever)
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03/21/07 09:57 PM
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Re: really bad gas mileage!!!!
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high pressure can result in a rich mixture when running in open-loop mode
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Re: really bad gas mileage!!!!
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Corey what brand O2 sensor did you use?
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CJM
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(Body Damage is Cool)
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03/22/07 10:49 AM
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Re: really bad gas mileage!!!!
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Quote:
high pressure can result in a rich mixture when running in open-loop mode
I guess thats my next step .
Quote:
Corey what brand O2 sensor did you use?
I dont remember , but it was an aftermarket NOT oe ..
I did replace it with a couple of "cleaned" OE sensors I had on my shelf , and there was no change . It is the single wire O2.
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Re: really bad gas mileage!!!!
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Quote:
high pressure can result in a rich mixture when running in open-loop mode
Low fuel pressure will result in a poor spray at the injectors thus also resulting in a rich condition.
I would verify fuel pressure...
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oldsub86
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(Rock Warrior)
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03/22/07 10:56 PM
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Re: really bad gas mileage!!!!
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Is your rebuild stock or did you change things in the engine?
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