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Old 10-18-2010, 11:37 PM
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low rail pressure help..

I ran into some trouble and Im hoping that im not gonna have to make a trip to the dealer cause its surely not going to be covered under warranty they have seen my truck to many times with all the go fast parts on it..anyways earlier today I was towing 10,000 lbs on the spartan 175 enhanced tune (freeway driving) and expirienced a low fuel rail pressure code (I honestly dont exacty know when or how it happened I just noticed low power shortly after a WOT pull up a steep grade) and it seemed to throw my truck into some kind of limp mode where I couldnt make much boost or power I dont know if this was due to an actual limp mode or if it was being caused by continuing low rail pressure..I was not monitering my FRP when this happened so I dont know. I pulled over and looked under the hood for anything abnormal and found nothing I got back in the truck and fired it up and the problem was gone. The truck now maintains 24,500psi at full throttle which is perfect..at idle it maintains 5,000psi which again as I understand is right on the money. This is the first time this has happened to me Ive towed and drag raced many times on the race tunes and even then this didnt happen. What are your thoughts? I have a TS-mp8 stacked with my spartan (its a fuel pressure box) and I was running it at the time this occured..I have run this setup for awhile now and have never had a problem.. Ive actually been very pleased and would diffenetly reccomend but I am calling it into question. If you have any questions about my mods just check my sig! Im hoping this is a fluke
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Old 10-18-2010, 11:47 PM
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This also seems awful strange to be happening on the 175 tune...not much fuel in that tune..like theres something wrong with the truck
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Old 10-18-2010, 11:47 PM
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The Code is P0087 and it's most likely your high pressure fuel pump but it could also be the controller. If it's the hpfp then it's a cab off operation. I know this because I just dropped my truck off today and I had the exact symptoms as you. If you are located anywhere near Houston my diesel tech will take care of you and not report your truck in oasis.

this is from my thread about this:
I just got off the phone with my Ford diesel tech and it looks like my hpfp may be going out (P0087 coming back on after wot). He said not to worry about my programmer, just bring it in and he'll warranty everything that is wrong. I've also lost about 4 gallons of coolant on the driveway too. This is the same tech that warrantied my transmission at 30k when it went out.

He said the cab will come off if its the hpfp. I asked about him doing an egr delete and possibly studs while the cab is off. He said that wouldn't be a problem, that we'll discuss that on the side. What else should I do to the truck while the cab is off? Not looking at spending 10,000 on fuel and turbos, just longevity inducing mods. I plan on keeping this truck for years and need it to remain my reliable dd.
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Old 10-19-2010, 09:05 AM
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is there any other possibilities or am I ****ed on this one?
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Old 10-19-2010, 12:08 PM
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I'll let you know my diagnosis whenever I'm informed.
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Old 10-19-2010, 01:51 PM
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Take that MP-8 off and see what happens....
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Old 10-20-2010, 12:43 AM
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ok yeah I did a few more WOT runs again today and everything is going ok dzchey seems to think that it was a glitch with the mp8 i thinking thats probably what it was...If i get the code 2 more times im gonna take it in
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Old 10-20-2010, 06:22 AM
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Quote:
Originally Posted by KTMotoRider1 View Post
ok yeah I did a few more WOT runs again today and everything is going ok dzchey seems to think that it was a glitch with the mp8 i thinking thats probably what it was...If i get the code 2 more times im gonna take it in
I've been having the code flash on several times over the last month. I'm not sure how long it would have lasted by just clearing the code when it came on and driving on.

I still haven't heard the verdict on what was wrong with my truck but my tech has already said he is for sure replacing the hpfp
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Old 10-20-2010, 08:46 AM
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alright yeah keep us posted on the verdict
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Old 10-20-2010, 08:04 PM
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Are you stacking the MP-8 on the Spartan tune? If so, why would you add a pressure/timing box on top of Spartans timing and fuel pressure modifications? As Jeff stated earlier I would remove the MP-8.
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