Big question: What should the fuel pump be doing when the key is turned to "on?"
Longer question: Ilsa has had a lot of work done lately. She got a new Magnuson 2300 supercharger (to replace her 120) and Kook's headers. Her exhaust system was redone, but it's pretty much the same custom true-dual system that was on before the headers. Her power steering was so close to the headers that it blew a hose, so I had to have the hoses rerouted away from the headers. After that, all she needed was a tune, but it was too cold to do it outside and we couldn't find an indoor dyno that was available. FINALLY, it was over 50 degrees yesterday, so we got the chance to do a street tune. Now she sounds great and has a lot of jump, but starting is a major problem.
When the key goes on, I can hear a faint electric motor which I assume is the fuel pump; but what happens next sounds like the engine isn't getting enough fuel to start. It goes like this:
1st crank - nothing
2nd crank - nothing, or maybe one hit
3rd crank - a couple hits
4th crank - a few hits, then a very rough start which finally becomes smoother
This sounds to me like the engine isn't getting much fuel during the start.
Does this sound a problem with the tune, or possibly a defective fuel pump (aftermarket Aeromotive)?
Can the computer be tuned to get more gas to the engine on startup? Again, it does fine after the engine finally gets going.
Longer question: Ilsa has had a lot of work done lately. She got a new Magnuson 2300 supercharger (to replace her 120) and Kook's headers. Her exhaust system was redone, but it's pretty much the same custom true-dual system that was on before the headers. Her power steering was so close to the headers that it blew a hose, so I had to have the hoses rerouted away from the headers. After that, all she needed was a tune, but it was too cold to do it outside and we couldn't find an indoor dyno that was available. FINALLY, it was over 50 degrees yesterday, so we got the chance to do a street tune. Now she sounds great and has a lot of jump, but starting is a major problem.
When the key goes on, I can hear a faint electric motor which I assume is the fuel pump; but what happens next sounds like the engine isn't getting enough fuel to start. It goes like this:
1st crank - nothing
2nd crank - nothing, or maybe one hit
3rd crank - a couple hits
4th crank - a few hits, then a very rough start which finally becomes smoother
This sounds to me like the engine isn't getting much fuel during the start.
Does this sound a problem with the tune, or possibly a defective fuel pump (aftermarket Aeromotive)?
Can the computer be tuned to get more gas to the engine on startup? Again, it does fine after the engine finally gets going.