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Thread: Terrible MPG
01-26-2010, 10:59 AM #11
Information about the IAC (Idle Air Control) valve can be found here http://www.2carpros.com/forum/1999-c...-vt323585.html
My description of the affects of a bad IAC are as follows:
-less responsive throttle
-truck seemed to idle to 1000rpms with a bit of a rough idle
Now there are a lot of different parts to check, but after I replaced this, I have been noticing good changes in the response and idle is a lot smoother. Does this affect MPG? I don't know for sure as I will do a comparison (before I seemed to go 284 miles a tank) 21 gallon tank=13mpg which is mostly city driving.
The IAC located on my 95 chevy 1500 (4.3L V6 Vortec TBI) (this is just below the TBI)
A print out from Auto-zone about checking this states:
1. Disengage the IAC electrical connector.
2. Using an ohmmeter, measure the resistance between IAC terminals A and B. Next measure the resistance between terminals C and D.
3. Verify that the resistance between both sets of IAC terminals is 20-80 ohms. If the resistance is not as specified, the IAC may be faulty.
4. Measure the resistance between IAC terminals B and C. Next measure the resistance between the terminals A and D.
5. Verify that the resistance between both sets of IAC terminals is infinite. If the resistance is not infinite, the IAC may be faulty.
6. Also, with a small mirror, inspect the IAC air inlet passage and pintle for debris. Clean as necessary, as this can cause IAC malfunction.
Last edited by liquidmetal; 01-26-2010 at 11:12 AM.----------------------------------------------------------------------------------------------
1995 Chevy Cheyenne 4.3L V6
1972 Chevy C-10 (on storage lot, fathers but part of the family chevys!)
01-26-2010, 11:54 AM #12
mostly city i dont go highway to much. mostly from home to school/friends so theres no need for highway use
and yes i like to stomp on the gas every now and then but not at every stoplight
01-26-2010, 12:34 PM #13
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city eats it up. still not sure if that will get you 7 alone though.This post has been rated MA LSV, and is intended for mature audiences. Reader discretion is advised. :fighting0037:
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01-26-2010, 12:48 PM #14
01-26-2010, 02:01 PM #15
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01-26-2010, 03:18 PM #16
01-26-2010, 03:27 PM #17
So all you do is drive in town. if thats the case its gonna be bad, my sister has a 1998 blazer same thing, NEVER on the highway and she just drives 2 miles to work then home. the truck can not get to operating temp which will give it really crappy mileage.99 K1500 Suburban LT "THE BEAST"
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01-26-2010, 04:23 PM #18
yeah in town short driving kills mpg. i'm only like 2 miles from my work so if i floor its or just little heavy on the gas i get 10-12 mpg. but if i drive to my parents a hr away then the mpg is alot better. and a 4 banger s10 will get about the same in town if you drive the same way. my brother had a '00 s10 that sucked on gas. it was totally stock and got worse mpg then my truck. just my 2 cents.Peter
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01-26-2010, 08:22 PM #19
alright so i cleaned my throttle body with a toothbrush and the cleaner today and man was it nasty. hoping this will up my MPG
01-26-2010, 08:23 PM #20
oh and another thing. a can of seafoam says to put 1/3 of it in gas tank. well if i have a 26 gal should i pour half of the bottle or all of it?
which would you prefer?
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