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#26 |
God is good!
Join Date: Sep 2010
Location: Texas
Posts: 689
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Re: Eight MPG?!
Aaaahh yes, the old overlooked leaky gas cap. Goes hand in hand with the elusive blinker fluid.
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#27 |
Registered User
Join Date: Jul 2010
Location: Georgetown, KY
Posts: 183
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Re: Eight MPG?!
I don't think that would explain your lack of power, but it could explain why you're mileage is bad. How does the truck act when you accelerate from a stop?
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Andrew 1987 V20 Scottsdale 383 TBI, SM465, NP208, 14FF, 4.10 1988 C1500 Scottsdale 305, 700R4, 3.08 1986 K30 Custom Deluxe 6.2, SM465, NP205, 14FF, 4.10 Last edited by 87 V20 Scottsdale; 10-18-2010 at 08:02 PM. |
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#28 |
Registered User
Join Date: Sep 2010
Location: The Dalles, OR
Posts: 392
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Re: Eight MPG?!
I only get about 10mpg highway. 250, th400, 3/4T 4x4. I don't really think I have much to complain about. It's a big-ass old beater that can haul anything I've thrown at it so far and go anywhere I've wanted it to go. Thought about the 700r4 swap a few times, but every time it comes up, I figure I could probably fill both tanks quite a few times and still come up ahead. Also, I've heard so much bad about those trannys, I know people say if they're built right they can handle a load on 'em but... maybe just superstition or something. Anyway I hope you figure out your problem.
P.S. I solved my commuting issue by buying a 1979 Datsun 210 for $300 that gets almost 40mpg, so I don't really care about spending the extra gas now when I need it. If the truck was my only vehicle I'd be in trouble 'cause I often have to commute from The Dalles to Portland (about 85 miles) for work. |
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#29 | |
Registered User
Join Date: Aug 2009
Location: Oregon
Posts: 611
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Re: Eight MPG?!
Yeah...I know it's never going to get amazing mileage but I figure it should get better than a school bus.
![]() Quote:
![]() Several years ago I had to drive a C20 with a 454/TH400 to the DMV....while it was only running on 7 cylinders and I could only get first gear. I'm pretty sure that thing got better highway mileage!
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'73 K20 Cheyenne Super Camper Special 350/TH350/NP205 sittin' on 33's. You can set my truck on fire and roll it down a hill, and I still wouldn't trade it for a Coupe de Ville. Last edited by Number21; 10-18-2010 at 11:18 PM. |
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#30 |
Registered User
Join Date: Sep 2010
Location: The Dalles, OR
Posts: 392
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Re: Eight MPG?!
Ahh, I thought you said the other one was a C10. Not paying attention.
I can't imagine why you're having trouble getting up hills on the highway. I don't even notice them when I'm driving my truck. Have you checked your compression by chance? |
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#31 |
Registered User
Join Date: Aug 2009
Location: Oregon
Posts: 611
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Re: Eight MPG?!
Not yet...I probably will when I get time to change the plugs. I am told "the engine was replaced 30k ago", but it seems like every truck on craigslist says that.
![]() My carb looks like it was replaced alot sooner ago than the engine/intake, as best I can tell is its a 600 CFM Performer. Maybe it's not tuned right at all, carbs aren't really my thing. I'm trying to comprehend the edelbrock manual right now...
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'73 K20 Cheyenne Super Camper Special 350/TH350/NP205 sittin' on 33's. You can set my truck on fire and roll it down a hill, and I still wouldn't trade it for a Coupe de Ville. Last edited by Number21; 10-19-2010 at 05:38 AM. |
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#32 |
Registered User
Join Date: Sep 2010
Location: The Dalles, OR
Posts: 392
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Re: Eight MPG?!
Mine needs tuned too. Running pretty rich. Unless your carb is WAY off somehow I still don't understand why you'd have no power if your engine's in good shape. I know the hp/torque of the 350 engines can be all over the place depending on what you do to them, but it should have plenty of power to get you moving without having to stomp on it, especially unloaded.
Good luck and have fun. |
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#33 |
Arrived on a Pale Horse
Join Date: Mar 2007
Location: SnagTown Indiana
Posts: 2,524
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Re: Eight MPG?!
My 87 30 gets 8 mpg consistently, and it's TBI injected. Doubt the gas cap is going to hurt the mileage very much.
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Jason 87 V30 350TBI/400 White w/Boss V-plow 89 R3500 CC SRW |
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