Won’t rev over 2k

So, I got one kicking my ass here. It’s one of the guys at the shops truck. I built the motor about 5k ago, he went to pass someone on the freeway last Friday and lost all power, pouring smoke out like a 12v with no fuel plate in it. Truck has 190/30s, a stage 1 cam we had laying around, don’t remember if it’s welded or not, Odawg intake, and tunes by tsd.

All inputs look ok, ebp is a bit high, but no change with it plugged in or not, fuel pressure sits at 45psi, tried reloading the tune, no change. Swapped ficms, no change, have a run up misfire on 5 and 7, 7 was at -4% on relative compression, had 310 psi on manual, 30% leakage from crankcase and possibly exhaust. No chug from crankcase, but does seem to have some excessive blow by, not sure if he just hasn’t gotten the rings fully seated or not yet, or what’s going on there, but currently not chasing that issue yet. Lol. Truck does have an egr valve, but the cooler is plugged, and according to ids the valve isn’t hung open or anything. Did the bubble test, no issues seen. Swapped bank 1 injectors with stock injectors we had laying around with no change. Truck also has a car, so I disconnected the down pipe, with no change.

This thing makes a pile of soot at the tailpipe when running it, acts like it doesn’t have any air. Pulled the cold side cac tube to rule out any cac restriction or anything, no change, but it does sound like a big block now.

Finally, pulled the crank sensor, and checked the tone wheel, as my rpm pid was kind of messy, but the truck is running like ****, so I’m not sure what was causing it. Tone wheel felt tight, looked at it with a bore scope, didn’t see any issues while turning it over.

I do not have access to an oscilloscope, but what are the chances the cam could’ve come out of time? That’s kinda where I’m stuck at now. Any help is appreciated...


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Is this an 04 with a throttle plate?

No 05 or 06, definitely no throttle plate


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Guess I should add too, no pertinent codes. Had 5&7 misfire codes and some fuel sender codes


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What are baro map mgp ebp koeo and koer.

How does it fair on turbo sweep test?

Can you build boost in bay?

Mityvac test to map line and sensor?

Bark and map are between 13.7 and 13.8, ebp is high at 15.3, but no change with it unplugged. Map line seemed ok, won’t build enough rpm to build boost, barely made it up the slight hill into the shop. Turbo spins free and canes are working, again, doesn’t run good enough to do much of anything. It maxxes out at about 5mph floored when trying to drive it


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Also, been testing with hot and cold side tubes disconnected, hot side due to having pulled the valve cover a couple times, cold side to rule out something sucked into the inter cooler and plugging it


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What's it doing when it tops out at 2k?

Does it run terrible?

What's icp act vs desired and ipr %.

I had a few that icp wouldn't keep up and Power balance showed all injectors weak when under load, find out not enough ICP

I would manually give it boost via Mityvac and see if it cleans up

Just smokes like crazy and quits running up. Didn’t look at iCp desired that I remember, actual is around 1500-1600, ipr in the 40% range, command ipr higher or lower to see if it’ll run up more and I start losing rpm. It’s a late pump, we changed the stc while it was apart, but did not change the pump as I can count on one hand how many of those pumps I’ve seen die.


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I know right. I love seeing cast iron pumps come across the counter.... It's like "oh someone's guessing"

Sounds like **** injectors to me.

ghohouston said:

Sounds like **** injectors to me.

Click to expand...

They are fairly old injectors, and been in 2 or 3 motors, and I have had some act like this, but never really out of the blue, especially cruising down the highway. They also all clicked fine, which I know doesn’t validate the fuel side, but for them to go from basically 100% to **** in 30sec is astonishing to me.


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Fuel pressure is low, especially for big injectors. Maybe fuel pressure bottomed out when he was getting on it and toasted the injectors.
Other things you might consider are cleaning the Ebp tube and the intake nipple for the map.

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Stock fuel pump? 45psi is low with stock injectors.


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Yeah stock fuel pump, he’s saving up for an air dog. Wrench got thrown in the works though, I’m sicker than **** so don’t know when I’m gonna be able to look at it again


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I mean, its possible.. Ive driven trucks for dio purposes with well under 20 psi and they drive just fine until you hammer it.

CTC DEEZUL said:

I mean, its possible.. Ive driven trucks for dio purposes with well under 20 psi and they drive just fine until you hammer it.

Click to expand...

Which is when the problem arose. He was on the interstate and hammered it. Could’ve dropped pressure and wiped some injectors?


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Swapped injectors, no change in how it runs. These were brand new off the shelf 190/30s. Guess next step is figuring out if the timing somehow jumped. I did pull the oil filter and cut it apart before swapping injectors, nothing crazy in it. Couple of little pieces of metal, nothing I’d worry about. Another thing I don’t think I said prior, this thing has nasty oil in it. I have no idea why either. It looks like a 7.3 with 300+ on it, not 1-2k oil in something that has all of 5-6k on a rebuild


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Could the intake manifold be plugged up (from when the EGR system was active)?
Done any tests on the VGT solenoid?