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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.
Thats terrible mileage. I get 20 to 22 in my truck. Who did your tune?
Sounds like you're not going into closed loop or your 02 sensors are bad.
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.
scanning software like HPTUNERS or EFI-LIVE
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?
http://toysandbox.com/diagnose02.jpg
And the other screen shot.
http://toysandbox.com/diagnose.jpg
Thanks for your help!
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.
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.Quote:
Originally Posted by RedHeartbeat
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
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.
those are programmers, EFI Live and HP Tuners are tuning devices. There are BIG differences between programmers and tuners.
Look to Nelson Performance for a tune. Nelson Performance - Performance without Sacrificing Drivability
In town?! Dam! How do i get mine to get that?!Quote:
Originally Posted by WARLOCK
Update. I bought a new o2 and the HPTuner software. (It hasn't arrived yet). I also disconnected my Oil Pressure Guage that was connected to the sensor on the back of the 5.3. How does this look?
http://toysandbox.com/diagnose02-nosend.jpg
And this one.
http://toysandbox.com/diagnose-nosend.jpg
Woohoo! Now you have it cycling! I bet it gets better mileage now.
i hope so! that's a pretty big difference that the trashed o2 was making the motor compensate for. congrats dude! I love when problems are properly diagnosed.Quote:
Originally Posted by RedHeartbeat