I have no injector pulse. S4 Turbo II PFC

Daedalus704 · 07-23-2012, 09:14 PM

So my car has been undergoing a bit of work over the past few months. Nothing terribly major, but I've run into an issue at this point.
I have a Power FC and Banzai Racing adapter harness and when I attempt to start the engine the injectors are not pulsing despite the Power FC showing it's percieved duty cycle.

Here's what I have done so far in an attempt to correct the issue:

Verified that the Power FC is not faulty
Replaced the engine harness with a new OEM one
Replaced the injectors with new DW units
Checked the "eng inj" fuse and it's not blown
Checked the resistors in the resistor pack and they are within spec (6.3 ohms)

I've also cleaned all of my grounds besides the starter ground. I have fuel pressure while cranking and a very strong spark from the coils. I cannot figure out whats going on, absolutely no fuel sprays from the primaries during start up. Prior to the Power FC install, I was having an issue with the engine bucking while under light load which I thought was TPS related (replaced with a new one now).
Never had any issues starting and idling though, just random lean spots while going over bumps and turning. Also if I had the car idling to operating temp, I would open the door and sit down and it would die as if the engine was out of fuel and then start right back up no problem (I figured this was related with the issue of going lean over bumpy roads, hence the reason I replaced the old broken harness thinking there was a short).

Any ideas? I'm stumped.

Thanks,
Steven

07-23-2012, 09:14 PM	#1
Daedalus704 Rotary Fan in Training Join Date: Feb 2012 Location: NC Posts: 34 Rep Power: 0	I have no injector pulse. S4 Turbo II PFC So my car has been undergoing a bit of work over the past few months. Nothing terribly major, but I've run into an issue at this point. I have a Power FC and Banzai Racing adapter harness and when I attempt to start the engine the injectors are not pulsing despite the Power FC showing it's percieved duty cycle. Here's what I have done so far in an attempt to correct the issue: Verified that the Power FC is not faulty Replaced the engine harness with a new OEM one Replaced the injectors with new DW units Checked the "eng inj" fuse and it's not blown Checked the resistors in the resistor pack and they are within spec (6.3 ohms) I've also cleaned all of my grounds besides the starter ground. I have fuel pressure while cranking and a very strong spark from the coils. I cannot figure out whats going on, absolutely no fuel sprays from the primaries during start up. Prior to the Power FC install, I was having an issue with the engine bucking while under light load which I thought was TPS related (replaced with a new one now). Never had any issues starting and idling though, just random lean spots while going over bumps and turning. Also if I had the car idling to operating temp, I would open the door and sit down and it would die as if the engine was out of fuel and then start right back up no problem (I figured this was related with the issue of going lean over bumpy roads, hence the reason I replaced the old broken harness thinking there was a short). Any ideas? I'm stumped. Thanks, Steven