Conversions & Swaps LSX Engines in Non-LSX Vehicles
Sponsored by:
Sponsored by:

L59 (5.3 flex fuel) question

Old 03-16-2012, 09:51 PM
  #1  
TECH Resident
Thread Starter
 
superdave84's Avatar
 
Join Date: Mar 2012
Location: Elkridge MD
Posts: 820
Likes: 0
Received 4 Likes on 4 Posts
Default L59 (5.3 flex fuel) question

Is there any reason to steer clear of an L59 flex fuel version of the 5.3? Better off to stick with a 5.3 LM7?
Old 03-17-2012, 03:06 AM
  #2  
TECH Junkie
iTrader: (1)
 
garys 68's Avatar
 
Join Date: Dec 2007
Location: Camdenton, MO
Posts: 3,706
Likes: 0
Received 32 Likes on 31 Posts

Default

No issues at all.
Old 03-17-2012, 11:31 AM
  #3  
sawzall wielding director
iTrader: (4)
 
G-Body's Avatar
 
Join Date: Sep 2004
Location: Downers Grove, IL
Posts: 3,120
Received 8 Likes on 8 Posts

Default

Larger injectors than the LM7 and you get the ability to run e85. Make sure you get the flexfuel sensor if you plan on having e85 capability though, as those sensors are expensive. Theres not really a lot of benefit to getting a l59. Well except for pulling up to a e85 pump and putting it into a car that was definently not e85 capable from the factory and having everyone freak. There are also not any drawbacks that I can think of. Running a tank of e85 every once in a while is a good way to clean the fuel system and injectors though, just watch out cause it tends to plug up a fuel filter a lot faster than a car that just runs plain gas.
Old 03-17-2012, 04:22 PM
  #4  
TECH Resident
Thread Starter
 
superdave84's Avatar
 
Join Date: Mar 2012
Location: Elkridge MD
Posts: 820
Likes: 0
Received 4 Likes on 4 Posts
Default

Great. Thanks guys.....you just saved me a few hundred bucks.
Old 03-17-2012, 06:46 PM
  #5  
TECH Fanatic
 
Bo185's Avatar
 
Join Date: Jul 2005
Location: Beebe, Arkansas
Posts: 1,683
Received 5 Likes on 4 Posts

Default

Originally Posted by G-Body
Larger injectors than the LM7 and you get the ability to run e85. Make sure you get the flexfuel sensor if you plan on having e85 capability though, as those sensors are expensive. Theres not really a lot of benefit to getting a l59. Well except for pulling up to a e85 pump and putting it into a car that was definently not e85 capable from the factory and having everyone freak. There are also not any drawbacks that I can think of. Running a tank of e85 every once in a while is a good way to clean the fuel system and injectors though, just watch out cause it tends to plug up a fuel filter a lot faster than a car that just runs plain gas.
The early L59's had a fuel comp sensor (FCS) in the fuel line, the later ones didn't not have the sensor. The later non FCS PCM's used the O2 sensor to determine a change of fuel based on fuel level and O2 reads then it would know what fuel was in the tank.
IIR its the 2005+ motors that don't have the FCS, the PCM has to have a working fuel level sensor, and the capacity of the fuel tank programmed into the PCM to run e85 with out the FCS.
Old 11-08-2014, 12:45 AM
  #6  
Teching In
 
urface19's Avatar
 
Join Date: Nov 2014
Location: Spokane valley
Posts: 4
Likes: 0
Received 0 Likes on 0 Posts
Default need opinion

I have an 03 l59 and the motor idled better when I ran e85 through it, now that I'm back on regular pump gas it idles low. (400rpm) I cleaned the TB and maf sensor the truck has fresh oil, anyone have any ideas?
Old 11-08-2014, 07:49 PM
  #7  
TECH Junkie
iTrader: (11)
 
S10xGN's Avatar
 
Join Date: Jul 2005
Location: Port Neches, TX
Posts: 3,782
Likes: 0
Received 6 Likes on 6 Posts

Default

Speaking of flex-fuel, can these things differentiate octane levels on straight gasoline or just between gasoline and ethanol?
Old 11-09-2014, 06:22 PM
  #8  
TECH Senior Member
iTrader: (25)
 
truckdoug's Avatar
 
Join Date: Nov 2013
Location: Portlandia
Posts: 6,330
Received 526 Likes on 356 Posts

Default

Originally Posted by S10xGN
Speaking of flex-fuel, can these things differentiate octane levels on straight gasoline or just between gasoline and ethanol?
not really. at least on my 2001 0411 pcm'd motor, I'm not sure about the later ones. on mine the composition sensor measures only two things, fuel temp and ethanol percentage.

there's a bunch of threads on flex fuel here and on hptuners if you wanna dig.
Old 11-09-2014, 07:39 PM
  #9  
TECH Junkie
iTrader: (11)
 
S10xGN's Avatar
 
Join Date: Jul 2005
Location: Port Neches, TX
Posts: 3,782
Likes: 0
Received 6 Likes on 6 Posts

Default

Originally Posted by truckdoug
not really. at least on my 2001 0411 pcm'd motor, I'm not sure about the later ones. on mine the composition sensor measures only two things, fuel temp and ethanol percentage.

there's a bunch of threads on flex fuel here and on hptuners if you wanna dig.
No biggie for now, we're firmly entrenched in oil country. Not an E-xx station within 100 miles...
Old 11-09-2014, 08:31 PM
  #10  
TECH Regular
 
squarles67's Avatar
 
Join Date: Jun 2013
Location: Orange, Texas
Posts: 487
Likes: 0
Received 6 Likes on 5 Posts
Default

Originally Posted by S10xGN
No biggie for now, we're firmly entrenched in oil country. Not an E-xx station within 100 miles...
You can get E85 at the new station at the south end of Bridge City.
Old 11-10-2014, 07:58 PM
  #11  
TECH Junkie
iTrader: (11)
 
S10xGN's Avatar
 
Join Date: Jul 2005
Location: Port Neches, TX
Posts: 3,782
Likes: 0
Received 6 Likes on 6 Posts

Default

Originally Posted by squarles67
You can get E85 at the new station at the south end of Bridge City.
Thanks! I had no idea... You local?
Old 11-13-2014, 06:17 PM
  #12  
TECH Regular
 
squarles67's Avatar
 
Join Date: Jun 2013
Location: Orange, Texas
Posts: 487
Likes: 0
Received 6 Likes on 5 Posts
Default

Yep, I'm in Orange


Thread Tools
Search this Thread
Quick Reply: L59 (5.3 flex fuel) question



All times are GMT -5. The time now is 09:32 PM.