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01-26-2010, 09:55 PM
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Junior Member
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Join Date: Dec 2007
Location: Wyoming
Posts: 9
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Poor Gas Mileage after swap?
I have about 500 miles on a newly rebuild Chevy 5.3 engine. I have all emissions removed and using an o2 about 10 or so inches past each header. No cats and an open filter. Other items. 1997 Dodge NV4500 5 speed, axles are 4:10 gears with 35" tires. My questions is, I am only getting 8 mpg and would like some guidance on how it could be improved.
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1969 Toyota Fj40, 2001 Chevy 5.3 Drive by Wire, NV4500. Build site at http://toysandbox.com
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01-26-2010, 09:56 PM
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Speedy
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Join Date: Jan 2009
Location: Augusta, Ks
Posts: 3,113
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Thats terrible mileage. I get 20 to 22 in my truck. Who did your tune?
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 2000 Silverado ECSB- 5.3 CAI, Pacesetter LTs, ORY- Pipe, Magnaflow XL, E-fan, Ported T/B , Nelson Tuned, Built 4l60e, Circle D Stall, 3.42s G80, 2-4 Drop, Hertz Highs, Rockford 501s *Waiting to be Installed* 220/222 .581/.581 114lsa, Magnacharger, 60lb injectors
2007 Hyosung GV650 The Little 650 Cruiser that could. 12.7 at 104 Mph
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01-26-2010, 09:59 PM
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New Member
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Join Date: Nov 2003
Location: Denton Texas
Posts: 17,738
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Sounds like you're not going into closed loop or your 02 sensors are bad.
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01-26-2010, 10:02 PM
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Junior Member
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Join Date: Dec 2007
Location: Wyoming
Posts: 9
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I used Brendan at Lt1swap.com. Is there a way to determine how or if they are going into closed loop? It looks my my ODBII program will show open/closed loop. I use Diagnose ODBII on the laptop to monitor.
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1969 Toyota Fj40, 2001 Chevy 5.3 Drive by Wire, NV4500. Build site at http://toysandbox.com
Last edited by sgirt : 01-26-2010 at 10:05 PM.
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01-26-2010, 10:11 PM
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New Member
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Join Date: Nov 2003
Location: Denton Texas
Posts: 17,738
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scanning software like HPTUNERS or EFI-LIVE
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01-26-2010, 11:59 PM
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Junior Member
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Join Date: Dec 2007
Location: Wyoming
Posts: 9
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Please take a look at my images. I was positive on your Closed loop. However, after running it in the garage for several minutes it went to closed loop. I really do not know how to read the O2 diagram. Does this look right? My Bank 2 looks odd. What do you think?
And the other screen shot.
Thanks for your help!
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1969 Toyota Fj40, 2001 Chevy 5.3 Drive by Wire, NV4500. Build site at http://toysandbox.com
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01-27-2010, 12:03 AM
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New Member
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Join Date: Nov 2003
Location: Denton Texas
Posts: 17,738
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you need a tune in the worst way. You're pulling 15.1 on fuel and its needing to probably pull even more. It should be about 5 max. RH 02 sensor is bad, too. Replace it first before attempting a tune.
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01-27-2010, 08:50 AM
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What now?
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Join Date: Jun 2009
Location: Cocoa, FL
Posts: 135
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What software is that?
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01-27-2010, 04:36 PM
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Junior Member
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Join Date: Dec 2007
Location: Wyoming
Posts: 9
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I will look into something like HP tuner or ? Would this effect my flashing or cause it to be reflashed? While I did the full rebuild of my LC, I know very little about the engines. Thanks so much for the info on the tuning. I will research them a little and may have quetions.
For the other - Here is the link to the software I bought. It is read only to your ECM.
OBDII Diagnostic ScanTools and code-readers
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1969 Toyota Fj40, 2001 Chevy 5.3 Drive by Wire, NV4500. Build site at http://toysandbox.com
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01-27-2010, 04:56 PM
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Junior Member
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Join Date: Dec 2007
Location: Wyoming
Posts: 9
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In looking at the two site you mentioned above, these are more than I thought a "tuner" is. Is this best to be farmed out or something that I should have with my engine conversion? I was thinking the tuners as the devices you buy to add enhancements to your ECM like what Diesel guys have from Bully Dog.
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1969 Toyota Fj40, 2001 Chevy 5.3 Drive by Wire, NV4500. Build site at http://toysandbox.com
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Linear Mode
