Fuel Injector sticking

[Fred W]

Oh man, Joe! I'm crushed that you didn't believe me?

It's good to see the scope waveform of the injector pulses.

One thing that sticks out to me is the variation of the injector pulse width occurring in such a short period of time. Was that taken with the O2 sensor connected?

 

[joebiodiesel]

Oh man, Joe! I'm crushed that you didn't believe me?

It's good to see the scope waveform of the injector pulses.

One thing that sticks out to me is the variation of the injector pulse width occurring in such a short period of time. Was that taken with the O2 sensor connected?

As often as I'm wrong, of course I believed you. I just thought you'd appreciate seeing it first hand.

As for the variation in pulses, It's not the case here. It's due to low screen resolution and sloww sweep speed of the scope. Raise the RPMs a little bit though, and there's some serious variations. I'm going to post some more info on that in my CO thread as soon as I get it organized.

Joe

 

[Fred W]

Ah, that makes more sense. It looked like only two out four pulses were shorter, which wouldn't make any sense. I'd expect any intentional changes in pulse width to be applied equally on all 4 cylinders, except for the CO trim, which doesn't vary over time.

Yes it is cool to see the waveforms. I've got several o'scopes kicking around but have never taken the time to hook one up.

PS - You do know I was kidding with you, right? (you had to mouse over the underlined words)

 

[joebiodiesel]

PS - You do know I was kidding with you, right? (you had to mouse over the underlined words)

I did know you were kidding. Mousing over the words is a cool trick, but I hadn't seen it until you pointed it out!



Joe