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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

4.0 Cologne Dies at hard brake

  #1  
Old 2 Weeks Ago
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4.0 Cologne Dies at hard brake

Bit of a puzzle I am new at being my own DIY mechanic, mainly because I deliver parts for a living and see a lot of bad things so I like to do the work myself If I can. My Ranger does this interesting magic trick at hard brakes at a complete stop. This happens on long hours of operation. I dump coolant every 1-1/2 weeks but no milkshake and I plan to replace my rear main which only leaks 1/2 a quart a week. I installed a IAC but do not know if it has a dashpot, the IAC fixed death on turning completely but like mentioned before if I brake hard it dies, starts up just fine, no rpm issues during normal operation. It is as if the engine gets confused and simply shuts off, I know I need to clean the intake and probably blast the IAC as well.. EGR? Although I doubt that be the problem.. This is interesting as my Ranger is a bit oldschool so if I turn on the compressor (which needs to manually be turned in via dash controls) my engine does not have the braking issue AT ALL, probably due to the extra RPM's off the compressor. Is she overheating? I can post videos and capture what happens.. I am new and only 25 but I love ford trucks to death and this is confusing the crap out of me!
 
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Old 2 Weeks Ago
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Welcome to the forum

What year Ranger?
1990-2000 had the 4.0l OHV engines, so covers alot of years, and a few BIG changes to the Rangers

And manual or automatic transmission?
Year will tell us what model transmission you have, but not if its a manual or auto

If 1995 - 2000 have you checked if there are any Codes in memory, specifically P07XX transmission codes if you have an automatic

1990-1997 use vacuum operated Fuel Pressure Regulator(FPR) which may cause what you describe, but so could a leaking power brake booster
 
  #3  
Old 2 Weeks Ago
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Originally Posted by RonD View Post
Welcome to the forum

What year Ranger?
1990-2000 had the 4.0l OHV engines, so covers alot of years, and a few BIG changes to the Rangers

And manual or automatic transmission?
Year will tell us what model transmission you have, but not if its a manual or auto

If 1995 - 2000 have you checked if there are any Codes in memory, specifically P07XX transmission codes if you have an automatic

1990-1997 use vacuum operated Fuel Pressure Regulator(FPR) which may cause what you describe, but so could a leaking power brake booster
1994 Ford Ranger XLT, V6 4.0L Cologne with automatic transmission, where is the FPR located?
 
  #4  
Old 2 Weeks Ago
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FPR is on the engine, passenger side lower intake, behind alternator
There are two fuel lines coming from the drivers side frame rail
The IN from the fuel pump line runs to the Fuel rail between upper and lower intake on Drivers side
The OUT line back to gas tank is connected to the FPR

The FPR also has a vacuum hose connected
Unplug this hose and check it for fuel, gasoline smell, that would mean FPR is leaking, and must be replaced
If no gas smell then don't plug hose back into FPR but plug the end of the hose, put a screw or bolt into the end of it
Then do some test drives and see if stall out still happens, if so then not an FPR issue
No it doesn't hurt to run FPR without vacuum hose attached, assuming its NOT leaking, lol
The vacuum is used to stabilize fuel pressure at the injectors, which helps computer to get best MPG and performance


Try shifting to Neutral as you slow down
With an automatic(yours is an A4LD model) there is a lock up solenoid in the transmission to lock the torque converter when moving for best power and MPG, but it must UNLOCK when coming to a stop or engine will stall
Shifting to neutral would avoid that and test if maybe that was the problem

Power brake booster
After you turn off the engine, press brake peddle down 4 times, it should be easy to press the first 2 times at least, maybe 3 times and then get hard to press down
Thats the Vacuum reserve in the booster, if its hard to press 1st or 2nd time then its not holding a vacuum so it could be a vacuum leak causing engine to stall at lower RPMs when using the brakes


Just an FYI if you want to read the codes on your 1994, which is good to do
Watch this video: youtube.com/watch?v=X07hu0kAuzE

You need to find the OBD1(VIP) connector in engine bay, it should be between brake booster and fender on main wiring harness coming from the computer which is located just below that area between fender and firewall
Key off
install the jumper wire as shown
Get in the cab and turn on the key
count the flashes of CEL

1994 use 3 digit codes, list is here: https://therangerstation.com/tech_li...gitcodes.shtml
 

Last edited by RonD; 2 Weeks Ago at 01:03 PM.
  #5  
Old 2 Weeks Ago
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I'll test the FPR and get back on that, I do believe it is the A4LD and know they have problems but it is rebuilt so there is no lockup that I can tell, The brake booster is functioning normally, 4th or 5th pump it gets hard to press so It is just old but I doubt a vacuum leak, there is no rust or corrosion in the area either. I do smell gas on a full tank (we are talking completely full) so maybe she is not burning it? Once I get my paycheck I need to get a new scanner so I can hookup and check any codes that you linked, thank you btw. I'll post some videos of this next time
 
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A4LD is a good transmission, the trans shop guys are the ones that goofed up on rebuilds and then blamed Ford design, lol
A4LD was the FIRST automatic Over Drive using solenoids, transmission shops had never seen one before and goofed up on repairs and instead of saying "oops let me read up on that", they did what all poor tech guys do, they blamed the design, "oh its a bad design".
A4LD was used from 1985 to 2012 in Rangers and other vehicles, no car maker would use a bad design for 27 years, lol.
4R55E(1995-2001) and 5R55E(1997-2012) are exactly the same as the A4LD they just got more solenoids so no change in transmission itself

Sorry pet peeve about A4LD being bad trans
 
  #7  
Old 2 Weeks Ago
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Oh no your fine, this is good to hear actually. I love this truck and have a thing for fords. when I found out my wife had a 1999 F150 my brain exploded.
 
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