1984 Ford Bronco engine won't restart when brought up to te

Tiny
PKRAMER
  • MEMBER
  • 1984 FORD BRONCO
Engine Performance problem
1984 Ford Bronco V8 Four Wheel Drive Automatic

I have been having problems off and on for almost 6 months, narrowed down the main problem and now I have a new one. On a cold start, engine starts, runs great, once the engine gets up to temperature the truck won't restart. I have recently replaced the coil, distributor, voltage regulator, selenoid, map sensor, fule pump, radiator, thermostat and gasket, wires, plugs, fuel tank and many other parts. Once the motor cools down, the truck starts up fine.

The truck has no cold idle.

The truck has no muffler on it, just the converter, straight pipe to the tail end, could that be contributing to this recent problem?

I had written to you once before within the past 3 months, and your suggestion was exactly what the problem was, so I am hoping you will have the same insight this time around.

Frustated and pooor! From dumping so much time, energy and money into this truck and yet. Another probelm!

Thanks,
John
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Sunday, September 28th, 2008 AT 9:38 AM

5 Replies

Tiny
RASMATAZ
  • MEMBER
Once the engine gets up to temperature the truck won't restart. Duplicate the problem and immediately look for fuel and spark and comeback with the missing one.
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Sunday, September 28th, 2008 AT 10:52 AM
Tiny
PKRAMER
  • MEMBER
When truck doesn't restart, I have both spark and fuel.

At cold start the battery is at approx. 12.3-12.5 volts. When started, alternator is 14.3-14.5.

Once engine warms up, shut truck off, wait one min. Turn key to start, truck acts like battery is drained-let truck cool down for 30-45 mins. Truck start right back up.

I also noticed that when truck is idling, voltage gauge on dash fans very little from discharge to charge. When accelerated, gauge does not go towards charge, it drops slightly.

By the way, the truck is a 1985, not an 84.

I appreciate any advice you can offer!

John
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Sunday, September 28th, 2008 AT 11:08 AM
Tiny
RASMATAZ
  • MEMBER
Check the starter control circuit-ignition switch/NSS/starter relay/starter itself and battery connections.
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Sunday, September 28th, 2008 AT 2:12 PM
Tiny
PKRAMER
  • MEMBER
Thank you,

The starter relay and all battery cables have been changed. The starter checked out ok.

What exactly and where is the starte control circuit ignition switch? NSS?

I also wanted mention (although I am sure you already know) the truck has an EEC-IV system.
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Sunday, September 28th, 2008 AT 6:30 PM
Tiny
RASMATAZ
  • MEMBER
Yes sir-I know about the Ford EEC system it was the SS/DS before it. Okay

Your start circuit comes from the ignition switch cranking position from there it will go to the NSS Neutral Safety Switch at transmission and then to the starter relay where it terminates from ther it will leave the starter relay on the battery positive cable going straight to the starter.

See below -start at the ( To ignition switch #ST follow the circuit thru starter relay and to the starter


http://www.2carpros.com/forum/automotive_pictures/12900_st1_19.jpg

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Sunday, September 28th, 2008 AT 10:29 PM

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