Here are the facts. Time to time the truck will randomly stall at a stop or low speeds. Four times I know of. It will restart but it is a hard restart as if flooded. My Hubby had to drive it "two footed" to get it on the freeway the first time it did this. At speed it was fine. Getting out of the parking lot and in the turn lane it would stall when he went for the gas. Two times when I was in the truck. Once right after a trip on restart and once at the drive-thru pulling away. Always when he is starting to push the gas and it is in gear. Never when I'm driving it so I can't say what it is doing any better then that.

All stock, just turned 215,000 miles

Things I have done:

• Used key to check for codes. 12, 17, 55. No codes that should affect this problem. No CEL on.
• Looked good and hard under the hood at all the wires. Regardless of what they do, vacuum lines, alt. and battery volt tested. Nothing.
• Unplugged AC clutch. It has a broken finger and the problem seemed to get worse when the defroster was on. No change.

Things I read here that I should look in to:

• Fuel pressure. Trouble being I don't want to drive around with the tester hooked up.
• Plug wires. They all look good. No evedance of sparking between them and no miss fires I can tell.
• Plugs. All ten are there but thats all I know about them.
• Cam pick-up. I hope not you can't find them any more. Plus, wouldn't that set a code?
• Low oil pressure shutting off ign. Is that a thing in these trucks? It runs low most of the time now.
• Intake gaskets.
• IAC
• TPS

Any clues would be helpful. I don't have the cash to pour in to this thing trying to find the right part by throwing parts at it till I find the right one.

 

I had a '96 Jeep Grand Cherokee with the same symptoms, a crankshaft position sensor went bad, and no code. Checking spark plug wires might better be done at night when checking for arcing, an ohm meter is a great way to check them also. Checking fuel pressure can be done while sitting still. As I recall, you are looking for 55-60 psi, steady pressure and no bleed off after engine shut down. For low oil pressure, you might just need a sensor. test with a mechanical gauge to make sure. I would suggest changing spark plugs at around 30k with the V10, I changed a set at 40k and was surprised it still ran due to excessive wear.

 

V-10's also have an issue with the oil pressure relief valve spring breaking. That would also contribute to low pressure.

 

1/24/2018



Truck problems:

In order of event occurring.



Past few weeks, cold start idle drop after two mins run time for about 4 sec then back to normal



Today:



Idle will drop below 500 rpm on stops after low throttle/off idle run then slowly climb back up to normal. I.E. Moving around in a parking lot in a parking lot. Truck was at temp, not a cold start.



Hard start/Start & die. Starts fine in “clear flood” mode. After engine temp is normal only.



Good amount of fuel in the oil now.



Other then that, it seems fine. No stilling during normal driving this time.



This time I was driving it the whole day. I will be reading around and doing homework as well. Plugs and wires are on my list for this as well as an oil change. But should I look in to an IAC or injectors? No cleaner have been used in the time I have had it so that should not be a problem. Given there is fuel in the oil I don’t think it is a problem with the pump or tank. Just thought I would keep you guys updated.

 

Or, I could just make sure all the vac lines going to the fuel reg are in good shape. Hopefully it's just that.

 

No vacuum lines to regulator that I am aware of. (regulator is back on the fuel pump module, in the tank)

Might try cleaning the throttle body, and resetting the PCM, let it re-learn the various sensors, and see if anything changes.