Hey Folks, this is my first post. I've been reading alot and have a few questions. I have an 06 F-250 6.0 PSD. About a month ago I started having loss of power, throttle response, and hard starting problems. I changed the oil, fuel filters, and cleaned up my "water in fuel" sensor (had that light on every day) and it seemed to fix it for awhile. Then two days ago I had the "dead gas pedal" problem. I turned it off, cycled the key a few times and it made it about 3 miles down the road before she had the dead pedal problem again and this time when I turned it off to cycle the key, she never started back up for me that day. I've read on here that it could be the orings on the HPOP, carbon build-up, or a bad ICP. I want to disconnect the ICP and see if that fixes it but nobody had said what would happen if I just left it unhooked if it did fix it, whats the long term effects of leaving it unhooked? Anyways, I'm open to all advice and look forward to hearing from you guys. Thanks in advance - Dave

 

What's the "dead pedal" problem? If you have had problems with the truck starting when warmed up, you may have a leak in the high pressure oil system. The fact that she now doesn't start at all, could be a worsening of the original leak or a completely different problem. I personally doubt it's your icp sensor. Leaving it unhooked, well you would have various problems down the road, basically all related to an engine not running the way it was designed to. Read up in the tech folder, there is a great section on troubleshooting a no start condition.

 

have your egr cooler and oil cooler checked. most probably it's a leak in either one or both. i had the same problems as u did. exactly.

checked and the egr and oil cooler both went out. if u want, buy those parts new from online or wherever u get the best prices, then take it to a decent mechanic who knows wat he's doing. unless u know how to replace those parts. they're parts tat are located towards the back of the engine.

also, when you're done, u'll need to flush ur coolant out the reservoir completely, put in new coolant, and do another oil change. u could reuse ur original oil filter, but i wouldn't. i'd use a new one again.

sorry pal, but i wouldn't take chances on ur truck dying again. i tend to be very thorough. best of luck. if u need a professional opinion besides mine, try looking for "cheezit". he's a certified ford senior master mechanic. other fellas include "rusty axelrod", "npccpartsman", and a bunch of others. offhand i cant remember all of them, but if u approach them, they'll be more than happy to offer u advice and help. i've learnt a lot from them and i'm an aerospace engineer. key thing to remember is tat these pros are more knowledgeable than the regular mechanic.

best of luck!

 

btw, u unhook ur icp sensor to do a test. u dont leave it unhooked all the way, all the time. i tink u'll get an eventual check engine light, no? i could be wrong. jus my 2 cents.

 

I would invest in a Scan Gauge II to help you with diagnosis. There are several posts that will help you get the different gauges setup that will enable you to monitor your HPOP pressure, oil and water temps, turbo boost, FICM voltage, the voltage the ICP sensor is seeing, IPR valve, etc. I had similar issues and it wasn't just one item causing the issues. I took it to my dealership and paid $85 for them to diagnose, that saved me a lot of guessing and troubleshooting without factory equipment. That combined with the Scanguage II has been invaluable for me. Truck runs like new again, but it's taken time to work through the items on a 7 year old truck.

Disconnecting the ICP sensor is not a long term fix. It provides valuable input to set the IPR valve and various other adjustable parameters to get the most life and power out of your truck.

 

Unhooking the ICP sensor is for testing not driving.

You need to get the truck scanned for codes. You could have an assortment of problems--EGR, HPO, electrical, injector, FICM......Too many things to just guess.

 

The truck is at the dealership now, it was actually convenient cause when she quit on me that was the closest secure parking lot. Anyways, the service manager there says he ran some tests and can't get it to act up and doesn't know whats wrong with it and can't diagnose it without it acting up. btw, I went up there yesterday and started it and it ran and started normally. I ran the codes on it myself and all it threw was P0299 for turbocharger underboost. No other codes. I'm pretty sure the service manager up there is an idiot but there is no other diesel places anywhere near my town. I'm seriously strapped for cash so i'm just trying my best to find the cheapest fix so I can have my truck back. Explanation of the dead pedal is when the truck is running and you hit the gas pedal and there is absolutely no throttle response, stays at 500rpm even where the pedal is on the floor. Thanks again guys -dave

 

hard to diagnose when u dun have other codes tat go along wif it.

have u tried pulling out ur egr valve to look at it. if its coked up, then it's probably stuck on open. clean it out. if the spring aint springy, then it's time for a new one.

also, could be faulty icp sensor. or maybe ur connections have come loose. i'd check the connections.

u could also have low oil pressure. again, ur HPO may have leaks and ur constantly not able to have high pressure in ur HPO system.

or the turbo vane could be sticking. dirty stuff. will need some cleaning as well.

possible dirty EB sensor. tis is under ur degas bottle. pull it out, and clean it up wif brake cleaner. clean tat receptacle where u pulled the sensor out too.