L59 (5.3 flex fuel) question
Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
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.
. 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. 
TECH Fanatic
Joined: Jul 2005
Posts: 1,685
Likes: 7
From: Beebe, Arkansas
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.
. 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.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.
Teching In
Joined: Nov 2014
Posts: 4
Likes: 0
From: Spokane valley
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?
Trending Topics
there's a bunch of threads on flex fuel here and on hptuners if you wanna dig.
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Joined: Jun 2013
Posts: 487
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From: Orange, Texas
