Won't rev pas 2k ish, new injectors, good fuel pressure, no boost, turbo soot pics!
My truck has brand spankin' new (rebuilt) stage-1 injectors from Rosewood. It still smokes like a bandit and hangs around 2k. It doesn't have a lot of power. Only every once in a while will it accelerate smoothly.
I have a gauge on the passenger side high-pressure oil line. It's reading around 700 at idle, and comes up to 1800-2k at WOT. When the revving hangs up, so does the gauge, and then after a moment, if it feels like it, the RPMs climb and the pressure climbs by a couple hundred PSI at the same time.
I'm fairly certain this is a high-pressure oil problem. I tried to measure the duty cycle of the IPR with a multimeter and got really strange numbers. 80% at idle, and around 50% at WOT. Weird.
Now I'm thinking I can start the truck and momentarily apply 12V 100% DC to the red/yellow wire to the IPR and the pressure should climb. If not... IPR is my guess. But it could be the HPOP. And I suppose I'd have to pressure test each head.
I jumped the yellow/red wire to + with the engine running and the IPR would open up and the pressure would drop. I then jumped it to the - post and it would skyrocket, one of my quick jumps hit like 3300psi. This would lead me to believe that the IPR and HPOP are capable of producing the pressures needed. It would also lead me to believe that maybe I didn't have my meter set correctly, because apparently the duty cycle to the IPR is controlled by switching the ground on and off, not the 12V line.
ICP unplugged doesn't improve driveability much. It still hangs somewhere between 2k and 2500.
So, unless the default ICP tables are EXTREMELY conservative and prevent the truck from reving, the only likely culprit at this point is low boost or the MAP sensor. So tomorrow I'm going to throw a boost gauge in. Is there a boost pressure to MAP voltage table floating around for testing?
So I unplugged the MAP sensor and took it for a drive. The truck seems to respond well for the most part. But once on the highway in 4th gear, it still hit a hang-up wall around 2500. At the wall, there was a lot of room left on the pedal which didn't do anything to bring up the RPMs, however there was a definite increase in turbo noise if I stepped on it further. To me, this would suggest that the turbo is definitely increasing in boost, but the truck isn't responding with the appropriate pressure. Granted, this may have been isolated to this drive just because the MAP was unplugged.
Unplugging the ICP sensor should make a difference. You should hear a change in the idle when you unplug it while running. If you do not hear this change, it might not be a bad idea to try a new ICP sensor. Is there any oil inside the ICP sensor where the electrical connector plugs into it?
It's important to remember also that stage 1's will run just like a stock injector without aftermarket tuning. So if you don't have a chip in the truck, don't expect any extra power over stock from it.
Just for grins, check your oil level and open the fuel bowl to see if there is any oil in the fuel. I've had messed up injector o-rings cause a hang up in the upper RPMs before. Improper installation can result in damaged o-rings.
If you unplugged the MAP sensor and it ran better, there's something wrong there. If/when the MAP is unplugged, the truck should be a total TURD.
Unless I missed something.
Also, like Travis said, you should notice significant change in idle or something when the ICP sensor is unplugged. A scanner will read 0 volts and 724 psi, or something, but even by ear you will notice a change.
We can do a pretty good job pinpointing oil pressure issues in the injectors, but that's not to say there isn't a problem there. If you eliminate everything else I can explain how to do a test for the High Pressure Oil side. But it really doesn't sound like that's your problem yet.
I drove 350 miles with no power. I was topped out at 45mph going up some of the mountain inclines.
Then I installed a boost gauge and made the return trip. It never went over 5psi. Once I hit the power wall, if I pushed the pedal down past it, I could hear the noise of the exhaust or turbo change to a higher pitch, but the gauge wouldn't really move, and the truck wouldn't rev higher.