Recently I have been experiencing dead pedal every now and again, but it eventually comes back. Its happened on the interstate a couple of times and that can get pretty dangerous. Now I am having issues with a no start condition out of no where. It will eventually crank but it churns and churns for a VERY long time, like 15- 30 mins before it will fire again. This has happened twice now. Here are the codes I pulled from Torque:

P0263
P0281
P0299
P0528

Any ideas where this is all coming from? I thought at first bad TPS on the adjustable pedals, but now with the no start condition, could it be fuel pump related? Yesterday i was at the dump and it was idling, then got real erratic and shut down. Then wouldnt start for 20 mins.

 

To The Top

 

Starts fine cold?
Any ICP and IPR numbers you can provide?
Charging system is up to the task? Good batteries?

Be sure you don't run the batteries down, the FICM hates that as well as the injectors.

 

These problems never surface cold, only qfter driven and at operating temp. My batteries were just replace and charge is good. There are 3 FICM readings, not sure what is what, but two are 13.0/13.5 and the other about 45-49. I can add ICP and IPR numbers if they can be added to my Torque app. Is there a PID for it? Should this be while driving? Im afraid to even drive it now until I know whats up.

 

Ok, I found ICP and IPR. Readings are below on a cold start and idling for a couple of mins:

ICP/HPOP = 850-900
IPR = 30% (+/- 1%)

Lost and issues are not consistant at all. Runs perfect, then takes a dump on me out of no where.

 

See what ICP and IPR do when trying to start after coming fully up to temperature. Also what is IPR/ICP at idle when engine is fully up to temperature.

 

I will drive it around the neighborhood tomorrow and get it up to temp and report back.

 

Full tilt boogie at Operating Temp:
IPR max: 78%
ICP max: 3931

Idle at Operating Temp:
IPR: 22%
ICP: 588

Starting at Operating Temp:
IPR: 23%
ICP: 688

Only issue I had on this run was the idle fluctuating a bit and a slow responding pedal one time. 15 min drive each way. No stall, no hard start.

 

That all looks fine to me, but you also described not having any problems, so that goes hand in hand.

It's annoying but you're going to need to monitor that stuff religiously from now on so that when the truck does act up, you know what those figures are while it's acting up. 9/10 the problem you're describing is a high pressure oil problem and those numbers will confirm that or refute it.

The other side of the injectors working correctly is the fuel side. I had a truck with a fuel delivery problem where the small tower valve in the upper fuel bowl was not depressed properly by the fuel filter shutting off fuel to the injectors. A fuel delivery problem is most easily seen IMO with a fuel pressure gauge; that's worth having all the time IMO.

The other thing that just comes to mind as a possibility is your throttle position/pedal position sensor. I hesitate to mention because I don't want to start a goose chase, but I think when that acts up your cruise will also not work or not work correctly. Do you use your cruise control at all and if so has it acted up at all? I think it would be good to monitor your TPS value so you can see if it's responding correctly during a "dead pedal" episode.

The FICM can also cause problems but the PIDs you pulled show that logic power seems ok. 45 is low but if you were cranking and cranking I'm not surprised to see that drop to 45.

 

I rarely use my cruise control, but when I have it has never given me issues. FICM didnt go below 47 and stayed right at 47.5 most of the time.

Will the HPOP come and go like this? When I get the dead pedal, it idles fine. Could the HPOP cause the theottle issue too? I was thinking the two issues are seperate but I dont know. Ill keep monitoring it, but not sure I want to get it on the interstate. Id hate to get the no start condition, the dead pedal is bad enough.

 

If HPO falls on its face yes it will cause driveability issues. I wouldn't expect it to be intermittent though.

When I had the fuel valve problem the truck would idle fine but when you tried to accelerate it just had no power, would run like crap and start smoking some and cylinders would drop out until I lifted off the pedal then it would clean itself up after a minute and idle fine again. Fuel pressure was fine at idle, but would drop like a rock with any throttle. If you haven't checked fuel pressure yet I would definitely do that before tearing the top half of the engine off to get at the HPOP.

 

^^^ What he says. Here's what caused my low fuel pressure.

 

I take it that's not motorcraft?

 

It is Motorcraft. I just got in a hurry and did a sloppy job of putting it in.

 

Looking pretty squashed