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.
1969 Toyota Fj40, 2001 Chevy 5.3 Drive by Wire, NV4500. Build site at http://toysandbox.com
Thats terrible mileage. I get 20 to 22 in my truck. Who did your tune?
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
2004 Buell XB12s
Originally Posted by LamboDoNoMo
Sounds like you're not going into closed loop or your 02 sensors are bad.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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.
Last edited by sgirt; 01-26-2010 at 10:05 PM.
1969 Toyota Fj40, 2001 Chevy 5.3 Drive by Wire, NV4500. Build site at http://toysandbox.com
scanning software like HPTUNERS or EFI-LIVE
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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!
1969 Toyota Fj40, 2001 Chevy 5.3 Drive by Wire, NV4500. Build site at http://toysandbox.com
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.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
What software is that?
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
1969 Toyota Fj40, 2001 Chevy 5.3 Drive by Wire, NV4500. Build site at http://toysandbox.com
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.
1969 Toyota Fj40, 2001 Chevy 5.3 Drive by Wire, NV4500. Build site at http://toysandbox.com
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