Stock underboost tuned over boost issue - Ford Powerstroke Diesel Forum
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Old 02-09-2014, 09:56 PM
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Stock underboost tuned over boost issue

So I have this 05 F350 169xxx KMs I got almost two years ago. Within the first month of buying used at like 130xxx I had the egr failure with the coolant flowing through the turbo and what not. Got fixed at a ford dealership.. Since then it's ran great for a year so I decided to do a few preventative measures and upgrades. egr delete, coolant filter, 4in turbo down to 5in MBRP dual exhaust and a sct 5015 with tunes by innovative diesel. So the problem I have is on the extreme street tune I have I'm over boosting to about 32.5 PSI which stock before any upgrades I only got 28.5. after the upgrades and now when I'm on stock or on the economy tune I only get 20 PSI but sometimes it'll shoot up to 26 with the sct monitor reads as the high but I haven't seen it on the stock gauge also scanned for DTCs and nothing out of the usual egr no flow and voltage for it being unplugged..any help would be greatly appreciated also if you need more info I'll try to answer to the best of my abilities :p
The back pressure says 60 at idle and 170 at WOT replaced the sensor and didn't change anything. Cleaned the sensor tube.

Last edited by Cartermackay; 02-09-2014 at 10:06 PM.
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Old 02-10-2014, 03:35 PM
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Also more info in what we've tried. With key on engine off the sensor reads .93 volts and the gauge says 50 psi. With key on engine running the gauge reads 60 psi and wot is 178. Tried plugging the egr valve back in and running like that and nothing has changed
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Old 02-11-2014, 04:46 PM
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I took the solenoid out and sprayed it off with carb cleaner.. O rings looked good nothing was dirty other then the tip had some gunk on it didn't look too bad.. Sprayed more cleaner in there and then put her back in.
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Old 02-12-2014, 05:49 AM
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Your grammar in post one make it tough to understand what is happening.

It sounds like your SCT isn't reading correctly. 0.93v shouldn't be 50 psi, nor 178 at WOT. Depending on the PID, it should be 14.7 - 52 psi (atm) or 0 - 38 psi (rel). Of course, you could have a leak or even sticky vanes. EBP, Boost, Vane position and EGT values will help you trouble shoot the problem.
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Old 02-13-2014, 07:33 PM
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Sorry haha. VGT duty cycle .69 idle .38-.40 WOT
EGTs 280-305 idle 60mph cruising 650
ICP dudty cycle .23 idle .79 WOT
We had a volt metre on the wires to the back pressure sensor

Forgot to say after this started to happen I took the turbo off and cleaned off the bit of rust and black soot then out a layer of never seize where the vanes go.. Some pitting on the vanes nothing too bad

Last edited by Cartermackay; 02-13-2014 at 08:25 PM.
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