Runs great and then dies??? - Ranger-Forums - The Ultimate Ford Ranger Resource


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

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  #1  
Old 11-02-2007
basebal_21's Avatar
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Runs great and then dies???

Ok, i have a 91' Ford Ranger 4.0 5 spd 4x4 with the engine out of a 92' Ford Explorer automatic 4x4...Now, It starts right up and will idle and can drive it around for about 20-30 mins with no problems and then all of a sudden it just dies and will not start for about the same time it runs. The guy who did the engine swap on it gave up.... Any Idea's..... I've had the truck for 2 years and it has only gone 8 miles in my ownership..Please help!!
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Old 11-02-2007
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have you check the coil pack on it some times when them thing get hot it wont turn on till it cools off
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Old 11-02-2007
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A couple of questions and some thoughts.

When it dies.. does it die as if you turn the ingition off? Or does it loose power then die.

When trying to restart does it turn over just as quickly as when it starts?

When it does start does it fire right up? Or does it fire up slow/rough/???


Some thoughts:
1) I've know of some better quality car alarm systems that will let a car drive for 2-3 miles then kill the ignition. Does it have a system like this?
2) It takes three things to make fire. It's not the air. So it has to be either fire or fuel. Since the ignition is easiest to check.. check it first.

Rich
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Old 11-02-2007
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Yes it just turns off like it would if i turned the ignition off, yes it turns over the same as it did when it starts, and yes when it does start it fires right up... It doesnt have a alarm system at all... it reads 35 psi of fuel pressure all the time so i dont think its the fuel pump.. I was thinking that a wire gets hot and just shorts out or something.. cuz it will run like a champ for a given time of 20-30 mins then just turns off.. hmm
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Old 11-02-2007
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i would try looking at the coil pack an go from there
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  #6  
Old 11-02-2007
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Will do on the coil pack... It won't be for awhile till i get to it because im in college in dayton and live in mansfield.. 2 weeks b4 i will be home... i'll get ahold of some friends to check it out.. thanks rangeredge
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Old 11-02-2007
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becuase you say when it get hot it does it cant hurt how many miles does it have on it
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  #8  
Old 11-02-2007
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not sure on how many on the engine but the truck has 166000.. I'll get back with the miles on the engine
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Old 11-02-2007
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140000 on the engine
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Old 11-02-2007
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I agree. I suspect the coil pac.

Before you buy one though. Get a cheap $5 spark tester at a parts store. It plugs in between the spark plug and it's wire. When there is spark this thing lights up so you can see it's working.

My money (if I were to gamble) is that it's the coil pac. What you describe is classic symptoms.

Rich
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  #11  
Old 11-03-2007
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The EDIS module could be acting up when it gets hot.
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  #12  
Old 11-10-2007
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so did you get it fixed yet
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Old 11-11-2007
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actually ya im sure i fixed it.. there was a wire that goes to the fuel cut off switch that gets loose.. i'll see if it fixed it for real
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Old 11-11-2007
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well that cool
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