Mechanic, but gasser...not diesel smart.
Issue: Ive been trying to hunt down an intermittently stuck open injector. Today I spent a couple hours disabling each injector and going for a ride around an empty parking lot.
Surprisingly it didn't matter which injector was unplugged, it would just stick open and roll black smoke and essentially stall and have no power (was still running, but no power and still blowing smoke).
I started looking at rail pressures. I sit at 7700-8000 rail pressure at idle, which I've been told is a bit too high...I need 5500-6000 at idle I've been told.
When the motor smokes out and dies, I sit around 11-12,000 rail pressure at a dead stop idle. If I try to give it has, it will bump to 14-15,000 but the truck won't respond at all...won't have power, will smoke a little more and that's all.
So I don't think I have an injector problem, but a problem causing high rail pressure (which I was told could stick an injector at idle).
So how does the rail pressure build/release?
Obviously the cp3 builds the pressure that gets sent to the rail. I'm assuming there's a regulator or relief valve somewhere on the rail?
I know there's the FCA that is ecm controlled that is on the back of the cp3...is this also the overflow/relief valve?
What would cause high pressure at idle, and cause rail pressure to stick?
Obd 2 isn't working right now, in the process of dealing with that too.
Sent from my Moto Z (2) using Tapatalk
Issue: Ive been trying to hunt down an intermittently stuck open injector. Today I spent a couple hours disabling each injector and going for a ride around an empty parking lot.
Surprisingly it didn't matter which injector was unplugged, it would just stick open and roll black smoke and essentially stall and have no power (was still running, but no power and still blowing smoke).
I started looking at rail pressures. I sit at 7700-8000 rail pressure at idle, which I've been told is a bit too high...I need 5500-6000 at idle I've been told.
When the motor smokes out and dies, I sit around 11-12,000 rail pressure at a dead stop idle. If I try to give it has, it will bump to 14-15,000 but the truck won't respond at all...won't have power, will smoke a little more and that's all.
So I don't think I have an injector problem, but a problem causing high rail pressure (which I was told could stick an injector at idle).
So how does the rail pressure build/release?
Obviously the cp3 builds the pressure that gets sent to the rail. I'm assuming there's a regulator or relief valve somewhere on the rail?
I know there's the FCA that is ecm controlled that is on the back of the cp3...is this also the overflow/relief valve?
What would cause high pressure at idle, and cause rail pressure to stick?
Obd 2 isn't working right now, in the process of dealing with that too.
Sent from my Moto Z (2) using Tapatalk