MikeGyver

iTrader: (5)

How do you know that "pulse from the injectors was such that it literally caused the motor to break up"? That is such a bizarre statement to make without an explanation.

MikeGyver

iTrader: (5)

I mean, what is the train of thought that leads to changing the length of a fuel line to cure a misfire?

03sierraslt

iTrader: (22)

Mike. Look up injector pulse dampeners. Crazy enough as it is I have seen it also, not on my truck but on another. Short story of it is that pulses in the fuel from the timing of the injector opening and closing causes a misfire of the injector and a lean condition. In both examples just changing the length of the fuel line eliminated the issue or made it much better. Theoretically that's a band aide as that's what pulse dampeners are for. Many oem rails have them

MikeGyver

iTrader: (5)

I guess if he said what you just said, and then said "based on having seen rail mounted dampers, I decided to try and making a pseudo damper by lengthening the fuel line", I would have understood.
But the way Vortec said it sounded like for some reason he lengthened the fuel line, the symptom went away, and after five beers he came up with a theory.

MikeGyver

iTrader: (5)

Thanks Pat, for translating Vortec350ss' enthusiastic "eureka" moment into layman's terms.

smokeshow

iTrader: (16)

Sucks, but sort of a cool problem to find and diagnose on an aftermarket setup. These days manufacturers are using enhanced injector control strategies to prevent these issues. Dividing one pulse into two, etc.

Vortec350ss

iTrader: (20)

I was chatting with my cousin who is an engineer at GE who spends most of his time analyzing vibrations, pulses, and frequencies. He pointed me in that direction. Its also a common problem in the subaru world and hes a WRX guy.

To be honest it was a bit if a eureka moment. I never would have thought that on my own. Ever. Luckily Pat ran into the same issue only weeks later and at that point it was easy to diagnose.


Call me crazy, but what he typed doesn't sound much different than "resonance in my new fuel system from injector pulses" and "the pulse from the injectors was such that it literally caused the motor to break up as though it had a 2 step" knowing that the problem is as described in the first post.

arthursc2

iTrader: (5)

Are you return or returnless? I know its in your build thread, but that **** is like 1500 posts long lol.

Vortec350ss

iTrader: (20)

lol I'm now return with an under hood vacuum referenced regulator.

oakley6575

iTrader: (5)

Made sense to me...