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02-22-2006, 06:23 PM
| #1 |
| Junior Member Join Date: Jan 2006
Posts: 9
 |  Horrible gas mileage I just put a truck together and have horrible gas mileage. I'm getting 12mpg driving easy/highway....does anyone have a suggestion.. I was thinking of swapping out my ring and pinion for a higher ratio. It is a 1990 chevy C1500 shortbed 2wd. It was a 454 SS I put a 350 TBI in it out of a 94. The rear is a 3.73 and the trans is the 3 speed th400. the computer is out of an 89 5.7L I think I even got better gas mileage with the 454 computer still in it. |
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02-22-2006, 06:23 PM
| #2 |
| Junior Member Join Date: Jan 2006
Posts: 9
| and the only engine code im getting is a 32 egr problem |
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02-23-2006, 03:16 AM
| #3 |
| Senior Member  Join Date: Feb 2006
Posts: 135
| Egr would definitly make gas milage suck, also, 3 speed tranny doesnt help, i think its a comb of things. Does it rev at cruisin speeds? A 4 sp would help. Perhaps a taller gear ratio? |
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02-23-2006, 07:03 AM
| #4 |
| Junior Member Join Date: Jan 2006
Posts: 9
| it revs at like 3,000 when you are going 65 |
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02-23-2006, 11:58 AM
| #5 |
| Senior Member  Join Date: Sep 2005 Location: ALABAMA
Posts: 3,292
 | 454 with a 3 speed, get used to it, I dont think you are onna get much better without going to an overdrive trans or a different motor.
__________________ Everyone hes to believe in something, I believe I will go ride my motorcycle. MSF certified Ridercoach USMC 92-96 USCG 98 to present |
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02-23-2006, 12:35 PM
| #6 |
| Senior Moderator  Join Date: Apr 2005 Location: Texas
Posts: 3,710
| Your lucky getting 12 outta it the way it is. The best I ever managed to get outta my old chevy was 8. That was with a carberated 350, TH400, and a 355 gear ratio. MY heavy foot didn't help much but even driving it normal still wasn't even close to being good.
__________________ John Wayne 2000 F-350 7.3L Powerstroke 4x4 |
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02-23-2006, 01:05 PM
| #7 |
| Junior Member Join Date: Jan 2006
Posts: 9
| im only going 55 - 65 on the highway to try to pick up a few extra mpg. I should have put a 454 back in it it only gets 1mpg less |
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02-23-2006, 08:06 PM
| #8 |
| Senior Member  Join Date: Dec 2005 Location: Texas
Posts: 172
| Partner, I have the same truck you have (1990 350 short-bed regular cab automatic) but I have overdrive trans. Around town I get 14-15 and I drive it like I'm in a drag race - all the time. Without the overdrive trans and those gears you have, you better just get used to it. Good luck.  |
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02-23-2006, 09:38 PM
| #9 |
| Senior Member  Join Date: Jul 2004 Location: Southern Missouri
Posts: 708
| yup agreed with the overdrive, something you need if you want better gas mileage
__________________ http://www.cardomain.com/ride/644045 Trucks are just cars when they grow up!!! If your gunna get a truck....Get a TRUCK!! |
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02-24-2006, 02:15 PM
| #10 |
| Senior Member  Join Date: Jun 2005
Posts: 2,753
| i agree, i aint gettin much better mileage than you, everything stock, like shoprattles said, bout 14-15
__________________ 99 suburban xlt 96 silverado 91 wrangler (my baby  )08 Honday shadow 750 (my mistress ) |
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