my 2002 LXT 4.0sohc truck dies when i go from D to R or P. starts fine. drives fine. and seems to idal fine. my history. changed PCV one year ago fuel filter last week. had a check engine light that turned out to be a vac leak. it was located on the Lt side of engine just under the coolent hose going into the intake man now fixed. other than that no real problems. any ideas? TX

 

i had the same issue. when it was on P it would turn off and from D to R and if i didnt switch fast and i kept it in N it would shut off. the issue, PCV. if u still have this issue it might be a blow head gasket, not sure.

 

has this not happend to anyone

 

same things happening to me right now too. i am throwing code p0401 (insufficient egr flow) I've replaced the EGR and DPFE. going to try a new PCV valve this week.

 

i have no check engine light on

 

anyone have any honest ideas

 

I had a similar problem. Not sure what it was or how I fixed it. I did plugs, fuel filter, and regular tune up stuff and it stopped.

 

you didnt change anything else. just plugs and fuel filter

 

I did wires too, oil, air filter, cleaned iac, maf, and tb. First time I had cleaned those last 3 and plugs hadn't been done in 70k or more. Made a noticable difference and stopped my idle/cutoff issues. I think I seafoamed it too.

It was all just regular maintenance things that I should have been doing anyway.

 

sorry whats the iac, got the other two

 

IAC = Idle Air Control

 

Might check the switch that prevents starting in any gear other than Park or Neutral. If it is bad or has shifted position it could cut the engine off when the selector is put into park.

 

Didn't happen to the Ranger but my wife's car did the same thing, especially when you go from drive to park or reverse really quick.. I discovered it had a tranny leak and was low on fluid. Fixed that and no more problem. Does it hesitate around turns?

 

I paid Ford $300 to find the source of this exact problem. My airbox lid wasn't sealing properly cause one of the clips broke. Zip tie fixed it.

 

Check the rubber elbow on the front side of the intake, its the hose that comes from the PCV valve to the front of the intake, they go bad on the 4.0 and cause this issue, also take your throttle body off and clean it, the build up around the butterfly inside can cause this as well.

 

Im having the same issue, and im thinking its the neutral safety switch starting to fail. It feels more like a shut down than an engine stalling. Anyone agree?

 

4.0 litre explorer drops rpms and sometimes stalls when put in park or neutral. I also noticed that the oil pressure guage will pop up and down a couple times as well. Could this be the pcv valve?