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Old 05-10-2010, 09:12 AM
Big-J Big-J is offline
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Default Gas Milage took a dive!?

Lately I have notcied my milage is terrible, and the idle is fluctuating.
I replaced my O2 sensor not too long ago, and it seems like it started after that. Any ideas on what is causing this?

Thanks for you help!
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Old 05-10-2010, 09:27 AM
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For a choppy idle I'd hunt for a vacuum leak, and/or leak to the air intake. Also did you disconnect the battery for a while to reset things after you replaced the O2 sensor?

What kind of truck? maybe it doesn't matter... the above guess is universal.
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Old 05-10-2010, 09:33 AM
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Mass air flow , or map depending on car. Also check the easy stuff.

Slarkplugs. Fuelfilter. Airfilter. Timing.
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Old 05-10-2010, 11:12 AM
Big-J Big-J is offline
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I didn't dissconnect the battery after I replace the sensor, I'll do that today when I get home. I check for leaks, but my plugs should still be good, I replaced them not too long ago.
Not sure how to check the timing?

Its a 99 4Runner SR5 btw
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Old 05-10-2010, 04:10 PM
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You could have just got a bad tank of gas, it happens. Look for any cracks in the big air tube going from the air filter to the intake, squirt something highly flammable at it while idling, see if anything changes.

Also check out the "routine maintenance brings the suck.." thread, for some nicely detailed pictures of your engine being taken apart and put back together. Maybe something will look different and jump out..
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Old 05-10-2010, 10:54 PM
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clean your mas air flow sensor, if it dosent fix it, it should be done regularry and will help anyways.. but use only mas air flow cleaner.. NOT brake clean your timing should be fine unless your timing belt is stretching..
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Old 06-02-2010, 09:26 AM
Big-J Big-J is offline
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Thanks for the tips, I had to go out of town for and have been so busy I haven't had time to take a look. This weekend I will clean my mass air flow sensor, I replaced that last year Im pretty sure.

I will try out all of everyones suggestions, but if all else fails, anyone know of a place that isn't going to charge me a lot of doe just to figure out what the problem is? Do you think a diagnostic would find the problem?

Thanks again for all you input.
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Old 06-02-2010, 09:39 AM
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Quote:
Originally Posted by nakman View Post
squirt something highly flammable at it
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Old 06-02-2010, 10:00 AM
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Quote:
Originally Posted by timmbuck2 View Post
hey man, it's free advice... you get what you pay for!

Big-J as for paying someone, check out the vendor section here. I think ATLR is a pretty good 3.4 guy from what I've heard http://www.risingsun4x4club.org/foru...ead.php?t=8747, Robbie is pretty much an expert at everything http://www.risingsun4x4club.org/foru...ad.php?t=10843 and you would be in good hands at Sleeoffroad as well. hth!
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Old 06-02-2010, 10:40 AM
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Quote:
Originally Posted by nakman View Post
hey man, it's free advice... you get what you pay for!
Ha! You wanna come show me that trick, I learn better from watching someone do it first......I stand way back!
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