Join Date: Jun 2008
Location: Fernandina Beach, FL, USA
Re: 1200lt cranks but wont fire now
I had a similar problem with my '05. I did most, but not all, of what you've accomplished.
In the end I pulled the fuel injector rail, turned it front-to-back and reconnected it to the high pressure fuel line. This was done to visually check that each injector was firing (squirting fuel/spray pattern). With the FI rail and injectors connected, engage the starter and look for fuel misting/squirting from each injector. My #3 was not working. My LT would crank, spark, but not run or even sputter. Why one of 4 injectors would cause this I do not know.
Anyway, I removed the injector from the rail to OHM test same. I accidently dropped the injector before testing, which tested OK. When I re-installed the injector it had an excellent spray pattern????? Best as I can figure it was clogged and the drop knocked whatever free of the injector.
You've gone this far, maybe pulling the injectors may help.