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what the hell???


20yearredneck

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my stuck stalled out about a week ago like it was out of gas or there was no vaccuum pressure. but today i went to start it to move it and its running with no problem. thought it was a fuel pump but could it be something else?
please help
 


RonD

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Coil?

TFI module?

http://www.therangerstation.com/tech_library/TFI_Diagnostic.html


As far as the fuel, if it dies again pop the hood and on the fuel rail you will see the schrader valve(looks like a tire air valve), put rag/towel over it(your hands) and press in the center pin, like letting air out of a tire, there should be 30psi of press in there so fuel should squirt out, if it does gas ain't your problem.
Also turn key on and you should hear the fuel pump come on for 2 seconds, if not the Fuel Pump relay is a common problem on older Rangers, on the '86 it should be on the passenger side fender/wheel well, it will have a Green base/plug, they are not expensive.
The EEC relay(Brown base) is right next door, failure of this one is not so common but it will also cut fuel as it powers the Fuel Pump relay.
 

swynx

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My truck used to do this. It stopped stalling after I changed the fuel pressure regulator. It was CLOGGED.

Nissan used to do this when the fuel filter got too dirty.
 

20yearredneck

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thanks

replaced the coil now its running like a champ
 

RonD

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If this is the first time coil has given you a problem then it is probably just an age issue.

Distributor system coils would often run too hot and fail early, the solution to this problem was to reduce the voltage at the coil by a few volts, i.e. 12v down to 8v.
This reduces the coil heat significantly.
Manufacturers would install a Ballast Resistor on the 12volt "+" coil wire, to reduce the voltage.
You can do the same.

It does reduce spark voltage which isn't an issue most of the time, but on cold engine in cold weather, a hotter spark might be needed.
So what the manufacturers also added was a 12v wire from starter motor side of starter solenoid to the "+" on the coil(with Diode), what this did was to give the coil 12volts only when starter motor was being used, so hot spark for starting.
On 4 post solenoid, that's what the 4th post was for, the "I" post goes to the "+" on the coil, "I" has 12v when starter motor does, no diode needed.
 

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