Question with step 69

sammy · Post by **sammy** » Thu Jun 30, 2011 4:09 am

hi
In step 69, it mentions that you should install the PWM flyback damping circuit if using low impedance injectors, but then it says it’s ok to install it with high impedance injectors too!
Then it mentions if you want the standard PWM to continue to #70.

I’m planning to use a stepper motor to control fast idle, therefore I have pretty much ignored most references to PWM up to now.
I’m just wondering , even if I’m using a stepper motor, would it hurt to install the PWM flyback damping circuit anyway – i.e. for future proofing? (in case I want to use a PWM one day?)

Thanks
Sam

Matt Cramer · Post by **Matt Cramer** » Thu Jun 30, 2011 4:14 am

Step 69 is for PWM control of low impedance injectors, not PWM idle control. I would leave this step in - you never know if you may end up switching to low impedance injectors for a later engine build that makes more power than your current injectors can handle.

sammy · Post by **sammy** » Thu Jun 30, 2011 6:33 am

HI Matt

thanks for this , I was obviously not reading the manual properly

I’ll keep it in

Sam

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