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Help With Interpreting AE ICP Results
Sorry in advance for the long post but I wanted to provide as much information as possible. I have been having a random hot no-start for the last few months. I have had two different diesel shops look at it but they could not find anything wrong. I finally broke down and purchased AE. After reading through what seemed like a gazillion posts on this site, I have never seen a thread where the problems were the same as mine. I have seen some that were close but every time, the threads seem to just stop with probable problems and the OP never came back with a fix. My plan is to post results of my fix in hopes that it can help others with their 6.0L problems.
Truck is a 2005 f250 6.0 with 51,000 miles. All stock to include Motorcraft filters, I run Opti-Lube at every fill-up, new batteries and I don’t think STC fitting has been replaced (bought used). My problems started about 1 ˝ years ago when the truck would randomly shut off when letting off the throttle. This problem progressively got worse and I took it to a diesel shop that had for 3 weeks. They trouble shot, swap parts from other known good parts and reported back to me that it was a bad PCM. I questioned how they came to that conclusion and they stated ‘We have swap out all other parts so it has to be that”. They wanted $2100 to install a new PCM (this included their diagnostics). I didn’t think that was my problem and told them to put my truck back together and I was coming to pick it up. When I picked up my truck (after paying $1200 in diagnostics fees) I have never had the problem anymore.
Fast forward to about 6 months ago, I started having hot no-start issues. Took it to a local diesel mechanic who has a good reputation for 6.0L’s and ask him to look at the truck for the hot no-start condition. He had it for a few days but could not re-produce the problem and said the HPO system pressures looked good. He didn’t charge me anything and told me to bring back when it broke and he would charge me when he fix something. Great Guy!!
So now, I am having cold hard-starts and hot no-starts. It runs great when it starts. I don’t drive the truck that much simply because I don’t want to be stranded. But now that the weather is getting warmer I need to tackle this problem. Yesterday I took it out for a good drive and when I got back, I shut it down for about five minutes and try to re-start it but it would just crank and wouldn’t start. I hooked up AE and recorded my attempted starts. The average results during cranking are as follows;
ICP Desired – 652 PSI
ICP Volts – 0.28
ICP Regulator (IPR Duty Cycle) – 84%
ICP (PSI) – 34 PSI
FICM (Main Power) – 47.5
I’m fairly certain that I have a major HPO leak with my IPR duty cycle getting up to 84% and my ICP pressure only building to 34 PSI. What I’m not sure of is if it could be my IPR stuck open or it’s a leak in the HPO system (STC fitting, dummy plugs, stand pipe o-rings). Based on my results, what do you guys think?
I’m getting to the point to just tear into this thing myself and replace all known problems (including Bullet Proof EGR Cooler and a new Oil cooler. I have also attached the Excel file with me AE results. Start attempts are highlighted yellow. Let me know what you guys think.
Thanks for your help!!!