Skip to main content ↑ ↓
Topic: Engine Stalling Intermittently on Deceleration (Read 3708 times) previous topic - next topic

Re: Engine Stalling Intermittently on Deceleration

Reply #15 –
my fuel presure gauge is homemade,, its "how to" is under the
inside tips section.,,under general car work i typed up.

http://www.foxtbirdcougarforums.com/showthread.php?t=2984

if  you think about it,, its pretty unfair for everyone to just test the fuel pres while in park.. A bad fuel pump will show up strong and healthy but fail while under a load. Its only fair to completely simulate the complete operation of the task your troubleshooting.

im gonna venture to say you might have a pick up coil going bad on  you,, its getting hot and breaking down.


the test to check the pick up / stator assembly is also in that link i posted.  try to check it with the engine hot then test with the engine cold.

did we cover the coolant temp sending unit,,? on the intake?

Re: Engine Stalling Intermittently on Deceleration

Reply #16 –
HOLLY COW!!!
i cant belive it but here is what i found..........

Located in the "Revised edition, Engine/Emissions-Diagnosis 1987 Shop Manual by ford for car and truck.............
section 20-22

the symptom and troubleshooting procedure for

"Intermittent Quits On Road And Restarts"
the first thing they call out to do after a visual and vac check is this..........

"Install a fuel presure tester with an extention hose that allows you to tape the guage to the windshield"

gezz, and i thought i just kind of made this idea up.

Re: Engine Stalling Intermittently on Deceleration

Reply #17 –
It is in a good state of "tune" and run fine other than the stalling on deceleration? If so, the ISC is the most likely culprit. Most TFI failures are from heat and won't immediately restart. Fuel pressure due to poor delivery probably isn't the reason b/c there is very little fuel needed while coming to a stop. There could always be an electrical short/open circuit caused by the vibration coming to a stop.

Re: Engine Stalling Intermittently on Deceleration

Reply #18 –
Still working on problem.

-----------------------------------------------------
Question 1

Since you cannot get the multipoint ignition rotor anymore
Ford requires (per 84 shop) dialectic grease 1/32 inch thick
from the rotor tip end all along the metal connector except for
tip end which goes to ignition coil.

> The new rotor I purchased has a black coating.  Is this in place of the dialectic grease? 
--------------------------------------------------------

Question2

I find using the VOM bulky at times.  For some reason can't locate the ODBI simple testers that use to be out.  Thought I'd make one that would just flash to indicate sweeps.

Anyone know if this will work?

Battery(+) -----> LED -------->Resistor(value ??) ----> Pin4 on Test Connector.

Re: Engine Stalling Intermittently on Deceleration

Reply #19 –
question 1
im lost,,, you should not be multiport anything. 
as for the rotor,, im not sure what you mean,, just stick it on the dizzy and add compound if you want to.


question 2
im lost again,, do you mean to pull codes?  if so , i dont use a light bulb, i use a small buzzer i got out of a microwave wave i salvaged good parts from. I find it easier to listen while i write down codes vs watching a bulb flash and having ot look back and forth from my paper to the bulb only to question if i missed a bleep or not.

Im currently working on using the door chime as the device to pull codes.  its alread built into the car and im looking into using it as a way to ding for each pulse.

are you trying to pull codes ? in this question?

check here for instructions on pulling codes and what they mean.....
http://www.therangerstation.com/tech_library/OBD_I.html

Re: Engine Stalling Intermittently on Deceleration

Reply #20 –
Quote

im lost,,, you should not be multiport anything.
as for the rotor,, im not sure what you mean,, just stick it on the dizzy and add compound if you want to.


Ford use to make a "multi-POINT" ignition rotor (was two wire sticking out instead of the "T" at the end of the rotor circle.
Thr 1984 shop manual indicates that if you use the T rotor instead of the multi-POINT you need to put dielectic grease over most of the metal of the rotor.  I now see they are coating the metal with some type of black material and I was wondering if this takes the
place of the dielectic grease.

Quote

i use a small buzzer .................
Im currently working on using the door chime as the device to pull codes.


Yes, I was referring to pulling codes.  Both are GREAT ideas instead of dealing with VOM or light. 

Will a buzzer work directly or does it require a resistor (etc) in the circuit to work?

Thanks
David

Re: Engine Stalling Intermittently on Deceleration

Reply #21 –
my buzzer has its own resistance built in i guess.  the coil inside it acts as the load.  Anything should work that makes noise and has two wires.  Anything from a beat up toy or whatever you can rob a noise maker from. 

humm,, its still early and no one is up yet so ill just thumb through the evtm and see if using your car chime circuit will work.

brb.......

---------------------------------

can someone try this out,, my car does not test properly when i pull codes nor has it ever even with the original eec.  Im reading up on troubleshooting that but it appears to be an excess in resistance on a wire somewhere.

maybe this would work,, seems simple enough to just tap into the below wire and hook up to the "STO" connection.

something tells me nothing will happen here cause the sto connection acts as a ground.

Re: Engine Stalling Intermittently on Deceleration

Reply #22 –
Could this possibly be a torque converter problem? I know the GM products had a solenoid that would go bad and not allow the convertor to unlock.
Is not unlocking a possibility with our convertors?

Re: Engine Stalling Intermittently on Deceleration

Reply #23 –
Softtouch:

Thanks for bringing the transmission idea up. 

I recall the 84 shop addressing this, but the last in the list (theirs and mine).  Hoping for a simple solution first.  Because of being intermittent, can't reproduce so far in static mode, am taking it one step at at time -- cheapest first.  Just blew out the trottle body all linkages with carb cleaner so will see if problem continues tomorrow.
Also put some graphic on the ISC plunger in case it was sticking.

David

Re: Engine Stalling Intermittently on Deceleration

Reply #24 –
I just got a reply back from Standard Parts.  For those interested:

The black coating on the rotor segment tip is for RFI (Radio Frequency Interference) suppression.
 

Re: Engine Stalling Intermittently on Deceleration {RESOLVED}

Reply #25 –
Thanks to all for the help.

Car finally had problems first thing this AM.  Got code 63, changed out throttle position sensor and back up and running.

David