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post #1 of (permalink) Old 01-22-2001, 01:54 AM
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Gas Milage

I am getting 12.5 miles to the gallon. I have done plugs, plug wires, PVC, fuel filter, radiator flush, distributer cap, distributer roter, chevron techron, air filter, and a oil change. Do you think that it could be my O2 sensor causing this? Any other sugestions? I used to get much better milage and cant figure it out.

1995 Extended Cab Truck, 4X4, 4.3 V6 TBI, 31/10.5/15 BFG AT's, American Racing Rims/8"/Neutral, 3" Trailmaster Body Lift, Westin Side Bars.
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post #2 of (permalink) Old 01-22-2001, 10:54 AM
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Re: Gas Milage

Was that before you put the meats on? Naw just kiddin'! Uhh what about your air/fuel temp sensor that adjusts your parameters. Do you have a large amount of raw fuel in the exhaust? Just for a safety measure is it bad enough that your gettin' fuel in your oil? Also notice a sluggishness, could be another sign of a too rich of a mixture. Good Luck... Wayne


post #3 of (permalink) Old 01-22-2001, 04:38 PM
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Re: Gas Milage

If you have anywhere near 100,000 miles, I would change the O2 sensor just to be safe. It is cheap and easy. Our '98 Jimmy gets about 20mpg highway.

From the second post, my fullsize seems to be getting fuel in the oil. What could be causing this? I have also recently experienced a drop in fuel mileage.

Thanks.

Nich Kenny
'89 K1500 350/700r4
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post #4 of (permalink) Old 01-23-2001, 12:56 AM
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Re: Gas Milage

How do I check the air fuel temp sensor? I would think that this is what decides the fuel air mixture, but realy have no clue.
As far as if there is raw fuel in the exaust. I am not sure. It is not black smoke coming out of it, it actually is normal looking. When I changed my plugs out that were in only about 10 to 15 thousand miles they were very black. Heard somewhere once that means running to rich but not sure and have no clue on how to check that. Any sugestions or should I take it and have that checked by someone more qualified? Would running to rich make me use all this gas?
Fuel in the oil??????

1995 Extended Cab Truck, 4X4, 4.3 V6 TBI, 31/10.5/15 BFG AT's, American Racing Rims/8"/Neutral, 3" Trailmaster Body Lift, Westin Side Bars.
post #5 of (permalink) Old 01-23-2001, 07:40 AM
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Re: Gas Milage

Did you check the timing? I had the same problem, changed everything then checked the timing and found it to far advanced.Up to 15 mpg now (haha).

post #6 of (permalink) Old 01-23-2001, 08:04 AM
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Re: Gas Milage

Should I take that and have it done, or is it fairly easy to do. If so how do I do it. Thanks!!!!!!

1995 Extended Cab Truck, 4X4, 4.3 V6 TBI, 31/10.5/15 BFG AT's, American Racing Rims/8"/Neutral, 3" Trailmaster Body Lift, Westin Side Bars.
post #7 of (permalink) Old 01-23-2001, 09:30 PM
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Re: Gas Milage

Desert Chevy... Fuel in your oil usually only means one thing. Fuel is passing by your rings, very bad. This is also dangerous, I had my 4.3L "rebuilt" by a "mechanic" and found fuel in my oil the next week. When I asked him about it he said it should be fine. Well the next day, when I started the engine the fuel that was in my oil decided to catch fire, at 4:23P.M. my engine fireballed, the valve covers destroyed, the timing cover destroyed, and every gasket blown or burned. So when you have fuel in your oil stop driving it and rebuild it yourself(so you know it is done right). Sorry for getting sidetracked but wouldn't want this to happen to anybody else.

88 S-10 Blazer 4.3l K/N air filter, 2" body, torsion bar/shackle lift, 30" muds, custom front/rear bumpers, 4 KC daylighters
post #8 of (permalink) Old 01-23-2001, 10:47 PM
 
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Re: Gas Milage

<font face="Comic Sans MS">It would seem that fuel in the oil can also be caused by a major malfunction from one of the sensors causing it to run overly rich. It'll gradually collect in there (just like blowby gasses) since all the fuel isn't burned if it's got an improper air/fuel mix. Don't drive it with fuel in the oil (It's a bad idea to have a solvent (gasoline) mixed with the oil because it reduces it's lubricating abilities, from what has been explained to me from various sources.) I don't doubt that though. The other reason and it's a valid reason as lake unfortuneately found out is it can go boom. [img]/wwwthreads_images/icons/frown.gif[/img] </font>

Tim "Sandman"

ORC Land Use columnist:
My November article on ORC
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post #9 of (permalink) Old 01-24-2001, 07:07 AM
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Re: Gas Milage

Got me confused on the oil in the gas. Is this what you think my problem is? How do I check that? Is running rich mean that this is the case?

1995 Extended Cab Truck, 4X4, 4.3 V6 TBI, 31/10.5/15 BFG AT's, American Racing Rims/8"/Neutral, 3" Trailmaster Body Lift, Westin Side Bars.
post #10 of (permalink) Old 01-24-2001, 11:45 PM
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Re: Gas Milage

Ouch!!

Nich Kenny
'89 K1500 350/700r4
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