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89 5.0l bronco, 5 speed manual

While towing the camper and family back yesterday, I was sitting idling and the bronco suddenly stalls (no sputters-just cuts off), start it back up, it runs for a few seconds and again dies. Turns over but will not start. About 45 minutes later I try it again and it fires right up and I proceed home again. While I am driving on the turnpike it dies again-the tachometer dumps to zero but no check engine lights or anything, then it comes back and is fine. This happens while driving one more time, the tach drops to zero, then a second later comes back up and bronco is running. It runs fine when it runs, just randomly cuts off and dies. I am not getting any warning lights or check engine lights. Is this a fuel pump problem? The haynes manual states I may have 2 fuel pumps, one in tank and one inline, is that true?
 

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Yes, the '89 Bronco does have a low pressure pump in the tank and a high pressure pump on the driver side frame rail (under the drivers door if I remember right). There was a way to jumper the fuel pump from the diagnostic connector under the hood to see if they are any good, but it's been many years since I owned my '89. Also could be a ignition module, gone bad. Good luck! Been through both pumps and a ign module, fairly similar symptoms.

-Lbrdsoxfan
 

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Yes, the '89 Bronco does have a low pressure pump in the tank and a high pressure pump on the driver side frame rail (under the drivers door if I remember right). There was a way to jumper the fuel pump from the diagnostic connector under the hood to see if they are any good, but it's been many years since I owned my '89. Also could be a ignition module, gone bad. Good luck! Been through both pumps and a ign module, fairly similar symptoms.

-Lbrdsoxfan
Thanks. When you say jumper the fuel pump from the diagnostic connector do you mean to read codes? Or is there a specific way to jumper just for the fuel pump? Also, you're talking about the TFI module, correct? Thanks for the heads up on that-I had that same problem on an 83 escort long long ago, very similar symptoms-would just die then start later and run fine. Think I'll replace that and the fuel filter and see if it happens again.
 

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These are also the symptoms of the PIP (I believe they are called the Hall Effect Sensor in the 80s models). If thats the case, a replacement of the distributor is the most common and easy fix....
 

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These are also the symptoms of the PIP (I believe they are called the Hall Effect Sensor in the 80s models). If thats the case, a replacement of the distributor is the most common and easy fix....
Thanks, that's what I am finding searching through the threads as well. Looks like I'll atleast try replacing the tfi and the stator if not the entire distributor assembly.
 

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Was able to run the codes after work. From continuous memory I am getting 18 or "IDM circuit failure or SPOUT circuit grounded" Does a bad stator cause this error?
 

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Sounds like it may be time to chase the ignition module. In all honesty, I'd replace it. I think it's about a 20 dollar part from the cheapo parts houses, but if it's the distributor mounted one like I remember, it's somewhat of a pain to replace. Any case, less work than the intake pump, I remember that being a PAIN since I had 3/4 of a tank of gas, when I dropped the tank.

Good luck, curious about what the problem is.
 

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Sounds like it may be time to chase the ignition module. In all honesty, I'd replace it. I think it's about a 20 dollar part from the cheapo parts houses, but if it's the distributor mounted one like I remember, it's somewhat of a pain to replace. Any case, less work than the intake pump, I remember that being a PAIN since I had 3/4 of a tank of gas, when I dropped the tank.

Good luck, curious about what the problem is.
From the code it is giving off, I believe the fuel pump is eliminated. From what I am reading, it is either a ground/short somewhere(not likely since the underhood is in excellent shape and all the wires I have inspected so far are in better shape than my daily driver) or the TFI module, or the stator(I have seen a few posts stating that when the tach drops to zero-it is the stator. In any case, I think I am going to replace the entire distributor and be done with it. I don't mind chasing a part except this is my camper tow vehicle and I don't like the idea of stranding my family on the side of the road on a "fun filled" weekend.:doh0715:
 

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Good luck, curious about what the problem is.

I think it is fixed. Took it out over the weekend for a 100 mile roundtrip after changing the TFI (ignition module) and pickup with no problems. Seems to run better to than it did prior to the problems.
 
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