Lately when I am coming to a stop and roll up to a stoplight/sign in gear the rpms drop too much and it stalls. I let the clutch back out and it starts back, but will stall again if I coast in gear again.

If I just push in the clutch without the rpm's coming up like to change gears it doesn't stall, only when I downshift when stopping and then once I push in the clutch the rpms drop and don't recover.

Truck runs great otherwise, new motorcraft icp and cps doesn't help. Thinking maybe ipr, but idk. I can rev it in neutral and it doesn't stall only when it's under load coasting, it's like the injectors don't recover from being off while coasting in gear.

 

mine WAS doing the same thing. Would drop rpm, if thrown in N, coasting to stop. I finally got around to changing the fuel filters, at the bowl and prepump. Honestly, i have yet to see/hear the problem comeback. I'll repost later today, since i got some running around to do

 

Changed the filter when I put in a new fuel pump a few months ago. Still runs great otherwise, mpg's are good once I fixed my stuck caliper lol.

 

So if it's getting ready to stall with the clutch pushed in, and the foot off the brake, what happens if you rev the go pedal a little?

RPM's pick up and a no stall or does the truck surge a little like maybe the clutch disc didn't disengage?

 

If I hit the go peddle it will save it, no stall, clutch is only a year old or so. New hydraulics about 3 months ago.

 

It does it when rpms are up from downshifting coming to a stop. Then I push in the clutch and it stalls.

 

yup...mines' the same way. There was one time where it dropped to about 300rpm, and it "caught" to stay alive....driving yesterday, i forgot to "listen/watch" for it. I think for me, it was a combo of both filters. Heading to beach today, so i'll pay attention, note if anything happens

 

Mine was catching to stay alive, but dies most times now.

 

fresh oil, new fuel filter, no change.

 

After reading the thread, I'm more convinced it's HPOP related than Transmission.

I would monitor a few PIDs just to eliminate them as a possible cause:

ICP 500 PSI or 3.4 MPAM Minimum the ICP should steadily climb during cranking. This indicates a healthy HPOP depending upon how high it climbs. It should be between 480 - 520 at idle.

ICPv (KOEO) Spec 0.20v - 0.30v This is important to check KOEO to verify the sensor is within range electrically.

FUEL PW: 1 MS - 6 MS (<1 / >6 IDM Suspect)

DC% - Cranking NTE 20% / 65% is closed. (IPR Suspect) 10% - 14% at Idle.

Low RPM's could also be an indication of starting / charging system problems which is drawing engine RPMs down when your coasting to a stop.

FUEL PW - Even though a 1 to 6 mS FUEL PW is shown, it’s possible the IDM did not receive the signal due to a CI or FDCS circuit fault or internal IDM failure or communications failure between the IDM and FP.

Hope this helps,

Tom

 

good hypothesis, but in my position, i have an aux fuel supply, which, when driving on it, DOES NOT harbor rpms's when downshifting/throwing in N...etc.

 

It runs great otherwise, I don't think it's the tranny for sure or the hpop . It's like the injectors never wake up after a while coasting in gear. Might try to rebuild my ipr, don't want to throw too much money at it haha.