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Discussion Starter · #1 ·
We have a E450 Ambulance with 6.0. We have put a new motor in it by a local SVI vendor and recently had to put a turbo in it. We after the new motor it started surging off idle. no mater what the engine speed it seems like you are getting on and off the throttle, at a rhythmic pace. place that replaced the motor said it was the HPOP, replaced that and it didn't fix the surging, then they said it was,oil pressure tube, that did not work either. Townsend Ford said that this is a common problem and that there is nothing they can do. I believe they just have no clue what their talking about. I remember seeming something on here about a voltage drop might be causing the waste gate to open and close, or create a WOT-no throttle and this might be causing it. Please, if there is anyone on this forum or maybe a great powerstroke mechanic around Townsend, MA let me know. This truck makes driving in slippery conditions sketchy especially when you have your partner and a patient in the back
 

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you might wanna check the FICM.. i never worked on an e-series before.. you should go buy a monitor for your truck/ambulance so you can give us readouts and we can better help you
 

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Discussion Starter · #3 ·
Just got off the phone with the people that replaced some parts on the motor. truck seems to surging at the 2000-2200 rpm, They think it has to do with the new software that ford loaded, thing is they put the same program in 12 other ambulances and they all work fine. Mechanic said when it was hooked up to the computer he didn't find any faults with the computer. and when they disconnected some sensors that it did not throw any codes. they said it seemed like the truck was running in "Back up fuel mode". He said that it looked like it the vanes and the EGR valve was the cause of the surge. That is the current update.
 

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Dont know if your new motor came with a new ebp sensor, but that may be something to look into, my guess anyways. It could be a bad flash, not a common thing, but it can and does happen, ford will just have to reflash the pcm if its the case
 

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Discussion Starter · #5 ·
Took the truck out and its surging through out the rpm range, not the 2000-2200rpm range the company told us. It did take about6 seconds to crank over too. don't know if this plays into the problem.
 

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Might be a bad injector dumping fuel maybe, broken tip? If you could monitor things it would make it easier to diagnose. Id recommend Auto Enginuity, as it will work on all of the fleet.
 

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check a few of these things out:
Ficm voltage
fuel pressure
icp% shouldn't be below 15 and shouldnt be above 85 around normal driving like 50-60mpg should be in 20's.
ipr voltage
injectors- any fuel from the exhaust pipe? smoke, blue, white, black on start up?

If its surging I don't think its turbo related and the Ford dealer sounds like a crack-job to me...

a scangauge from bulletproof diesel has all the pre-programmed points to monitor for the 6.0 and would be the cheapest route for in-house monitoring.

icp and ipr problems are HPOP relatedish... and those and low volts to ficm can cause extended starts. also just to be on safe side check your batteries and make sure your alt is putting above 12vs.
 

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For what its worth my truck did that when I bought it. Turned out to be the solenoid that works the turbo. Everyone said it was non turbo related but I disconnected the solenoid and of course the truck did not run well at all but the surging stopped. Bought new vgt solenoid and surge went away.
 

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try a new VGT solenoid before anything. They are very sensitive to dirt or any contaminates. Something as simple as removing and installing the turbo can do it.
 
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