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My 99 f250 is randomly dying and sometimes won't start back up for minutes. When it won't start I'm getting low or no oil pressure to injectors. I changed the IPR with a motorcraft replacement a month ago and that fixed it till a few days ago. I tried a new NAPA ICP and it runs better on the factory original. Unplugging the ICP doesn't help the no start. I've tried a new dealer CPS and no change. Can the hpop fail intermittently? Oil level is good, checked hpop reservoir and it's good. I'm stumped. Where do I go from here?
Almost 180k. I have AE but still learning how to use it. It's a bone stock E99. I've heard of the Cody test, I'll have to read up on it and give it a try. I just replaced the injectors with remans about 200 miles ago but theres been no change in how it runs.
If you could figure out how to use your AE and check your IPR % and ICP that would help too. Check your wiring, around the IPR and ICP pigtails, the UVCH connections and where the engine harness rubs on the driver's side VC. Those are pretty easy to check and it can't hurt.
I have figured out how to check IPR with the AE, but not sure what duty % is normal. I've had it hooked up a couple times when it dies and the psi just starts to fall off. It usually dies while coasting to a stop, sometimes sitting at idle. It does stumble occasionally while cruising.
The truck is acting the same now as before the injector swap so I don't think a torn o-ring is the culprit, unless they were bad before and I messed 1 up going in.
It acted like this a month ago but a new IPR seemed to fix it till last week. Also where do I find a write up in the Cody test so I'm sure to do it right. I would also like to do a compression test, is there a parts list of what I'd need to tie into the GP holes.
A good, quick way to check the condition of your cylinders/rings is to turn the oil fill cap upside down and place it on the fill tube. If it just sits there and rattles around you're not leaking compression into the crankcase, if it blows off due to pressure coming out then you have an internal problem. The Cody test you blow air pressure into the HPO rails and listen for air leaking out inside the VC's. I ran one and didn't have any leaks so I can't tell you what it sounds like but it is supposed to be pretty audible. When you do it it can get messy as the air pressure has nowhere to go and oil can, and will blow out on you during the process. I got some fittings and can hook my air quick disconnect right to the STC fittings on the HPO lines then turn the air in and not make a mess. For the HPO hose removal I got a wrench from a circular saw, cut a notch in it for the tubing and ground the tip down to facilitate getting it onto the hose. It beats fighting with screwdrivers and is a lot cheaper than buying a tool and it works awesome.
Is the tin nut tight? Did you try cold air on the IPR to see if that helps with start up? Does a new coil come with the IPR? I've never bought one. That is somethings that goes bad also. But if your dumping HPOP, it has to be in the IPR or injector o-rings I would think. Coolant looks good right? I would think the HPOP would work or not work.
Here's what I got, I had a fitting here from a pump and bought the adapter from the ORB to NPT so the air hose fitting can connect to it. Then you can take the hoses off at the pump, it's easier than getting at that one on the passenger's side. That wrench notch isn't pretty but it works.
Yeah I've done the oil cap test, it's good, actually got better after the injector swap. I'll try to source some tools and fittings for the oil lines to try the Cody test.
The tin nut is tight and the new IPR came with new coil and everything. Haven't tried canned air yet but did try a bottle if ice water yesterday and didn't help.
Keep the suggestions coming. I'm willing to try most anything. This is my work truck so it being reliable is a must. If it don't work I don't work
Do you have a way to check your fuel pressure? You need fuel, air and compression to make these things run. To get fuel you also need oil pressure, which is a good thing. If you can set your AE up and save a run it would make it easier to help figure it out. ICP, IPR %, FIPW will help with your fuel delivery process.
Over half a tank on fuel. I don't let it go below 1/4 before fill up. I changed the in tank screens 2-3 months ago when I installed the flatbed. When I get hime this afternoon I plan to run codes again, so I'll see if I can get some #'s to help figure this out.
Over half a tank on fuel. I don't let it go below 1/4 before fill up. I changed the in tank screens 2-3 months ago when I installed the flatbed. When I get hime this afternoon I plan to run codes again, so I'll see if I can get some #'s to help figure this out.
well I just got back from recording a run with the AE i'll have to figure out how to post here. a couple things I noticed were when the engine would stumble the psi would drop but the duty cycle would stay pretty steady. (cruising at 1000ish psi stumble, drop to 450ish psi then back up to 1000) it did die on me once at an idle, got out to open a gate. it wouldn't start right back up, and I noticed the psi was struggling around 250-300 and the duty cycle was 64.8% while cranking. I let it set a couple minutes and finally started. i'll work on figuring out how to post the graph, but want to get this info out there. thanks
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