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09-16-2005, 01:38 AM
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#1 |
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Registered User
Join Date: Aug 2002
Location: Corpus Christi, Tx
Posts: 156
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MPG Problems 2k1 chevy silverado.. v6 4.3 automatic
Im having problems with my silverado single cab v6 vortek 4.3. About a year ago when i got the truck.. i was getting 17/18 in city.. and like 20/22 on freeway.. Now a year later.. im getting like 10/12 in city and like 15 or so on freeway.. WHAT IS GOING ON... i have replaced fuel filter.. i have cleaned the KNN air filter.. i have kept up with oil changed.. i have used fuel injector cleaners.. used octane boosters once in a blew moon.. that stuff from lucas most of the time. The only thing i havnt done is changed plugs. A friend of mine thinks its a vacum leak.. but nothing visable.. and i cant hear anything.. Any ideas guys.? if not can you suggest a site with a forum for newer trucks?? thanks in advance..
Matt
__________________
email is matthew.solar1984@gmail.com 1980 Malibu Classic 2door(sold) 8-( 2001 Silverado single cab 4.3 V6(stolen and the totalled) 1979 GMC sierra swb stepside 350(sold) 1990 chevy suburban 4x4 350 2001 tahoe 4x4 2001 suburban 4x4 |
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09-16-2005, 08:08 AM
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#2 |
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67 is sold
Join Date: Apr 2001
Location: Troy, Michigan
Posts: 6,733
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How many miles on the plugs? I know they are rated to 100K, but that is BS, mine were toast at 80K.
When you cleaned the K&N filter, were you careful not to over oil it? Sometimes people do over oil it and the oil gets on the MAF sensor and throws things off. They end up cleaning the MAF (very carefully...). Have you made any other changes like tire size, etc? |
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10-04-2005, 11:52 AM
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#3 |
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Hittin E-Z Street on Mud Tires
 
Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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This thread is a little old, but you may want to try GM-Trucks.com if your still having the problem. They have helped me with my truck. Could be anything from plugs to a bad sensor, possibly an O2? A dirty MAF will do that too. Is your message center giving out any malfuntion reading?
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Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride  American Born, Country by the Grace of God  1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! |
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10-09-2005, 06:47 AM
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#4 |
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PROUD TO BE A MEMBER
Join Date: Sep 2005
Location: Jax Florida
Posts: 234
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10-13-2005, 11:35 PM
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#5 |
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Account Suspended
Join Date: Nov 2004
Location: Deer Park, Tx.
Posts: 2,522
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Have you checked your distributor cap and make sure there is not any moisture in there. There is a service bulletin on these trucks where the a/c line against the firewall is too close to the cap and causes it to sweat inside the cap. Check that out.
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10-13-2005, 11:42 PM
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#6 |
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He's got mean nasty FANGS!
 
Join Date: Dec 1999
Location: Rockwell, NC
Posts: 6,514
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They actually recalled most of em for the distributor cap now, might check into that, you get a free cap n rotor and they put a sleeve over the ac.
Without being able to play with it I cant say for sure why the MPG problems, but i would get a fuel pressure gauge on it and make sure the fuel pressure regulator isn't leaking, or the injectors aren't leaking...
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2004 K2500 Burb 1999 C3500 1985 Cutlass Supreme 1969 C-10 1967 C-10 Panel josh@67-72chevytrucks.com |
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