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Old 01-03-2013, 11:58 AM   #1 (permalink)
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Horrendous gas mileage?

I recently picked up a '92 pickup, 3.0, 5sp stick, 4wd extra cab. About to roll over 264,000 miles. I bought it from my buddy, and he claimed 17-20 mpg. Now I get it, I get 12.5-13. I don't like that. Are there any points I should check? Is this little truck supposed to get such terrible mileage?
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Old 01-03-2013, 12:12 PM   #2 (permalink)
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It should be getting much better than that. my 22r 4 spd was getting 25 when i drove conservatively and had smaller tires. but still gets 20 now. I've read that having some nasty emmission sensors can do that to your gas mileage, possibly o2 sensors too. Any warning lights?
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Old 01-03-2013, 02:33 PM   #3 (permalink)
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First, suspect the O2 sensor.

Second, are you making short trips in/around town during cold weather? Not warming up sufficiently will cause major drops in fuel economy.
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Old 01-03-2013, 03:26 PM   #4 (permalink)
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Stock tires or over sized. When I changed my o2 sensor I went from 18 to 25 mpg.
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Old 01-03-2013, 10:49 PM   #5 (permalink)
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I haven't looked at my o2 sensor, I have no warning lights but it does idle sporadically sometimes. Found a vacuum leak, fixed it, nothing changed. All my trips are 10+miles. I do have my hubs locked in frequently, but seldom actually use 4wd. I don't think that would have such a drastic effect. I have 31/1050/15 tires, which I think are the stock size.

Also, when on the freeway, I have NO passing power. That might be because I'm used to my thundering Ford's V8, but it's literally pathetic. I'd expect more out of a V6. Maybe there's something causing that too?
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Old 01-03-2013, 10:51 PM   #6 (permalink)
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P.s. just filled up again, got 12.45 mpg. Mostly highway, 65-70 mph.
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Old 01-03-2013, 11:19 PM   #7 (permalink)
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The O2 sensor has to be COMPLETELY shot to get a CEL on these trucks. They are good for @80,000 miles, depending on fuel used & general health of the engine (burning oil will make it fail quicker).

As far as power, these engines are getting old & a lot of tbings break down, electrical connections get corroded, etc. Things need to be replaced. I replaced the distributor in mine last year and it made a HUGE difference in power. New fuel pump made a difference, too.
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Old 01-04-2013, 07:48 AM   #8 (permalink)
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Check that your TPS is working correctly. Toyota recommends the timing be set at 10 degrees below top dead center. You might try 12 - 14 to make it a little more responsive.

http://www.4crawler.com/4x4/CheapTri....shtml#Dashpot

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Old 01-04-2013, 08:48 AM   #9 (permalink)
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It's pretty cold around me, so when i start up, mind you i have a 22r so i'm carbed, if its not warmed up properly and i tap the gas to take the choke off i have no power either, have to play with the pedal. BUT I imagine a frozen engine for you will do the same if the high idle is stuck open. First things first check your sensors, wires, plugs to make sure youre in good working order.
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Old 01-04-2013, 09:24 AM   #10 (permalink)
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Alright I'll do all that stuff soon. I'm about to do a full tune up
With leads, plugs, filters, etc. and my question is, should i replace the whole distributor, or can I get away with just the cap and rotor?
I live in Utah, so cheap gas is 85 octane. I put in Plus, (87 octane) and it made no noticeable difference.
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Old 01-04-2013, 09:54 AM   #11 (permalink)
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OP said he has no passing power... What about the cat? I had a clogged cat and I couldn't get my DD to go over 45mph...
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Old 01-04-2013, 10:16 AM   #12 (permalink)
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I have gotten it up to 85, and it felt like it had more. It just took forever and a day to get it up there. I am planning on exhaust work soon anyway, I'll look at it. I found crazy cheap cats online, so I wouldn't be opposed to changing mine.
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