engine trouble
Senior User
Joined: Jun 2004
Posts: 353
Likes: 3
From: Mid-Missouri
I've got a similar problem right now. Changed the TFI module and it didn't solve anything.
86 5.0EFI - F-150
I'll be driving down the road with no problem. All of a sudden, the tach drops to 0 like it loses it's signal. When I go to restart, I have to cycle the ignition key several times between the off and run position. Usually on the third cycle, it will start and run as if nothing is wrong.
The weird thing is, it only happens in the morning after it has set all night. Won't do it the rest of the day. It seems to happen during the first warm-up cycle as the truck approaches 170 degrees. After that everything is fine.
Doesn't seem to matter which tank I've got selected
Appears to be getting fuel, it restarts and runs fine until the next morning. There has been no other sign that the fuel pressure is running below normal.
When this happens, the rest of the electrical system seems to functioning.
Also, there are no codes other than the EGR, which it has had for 3 yrs now.
Mechanic is puzzled. I'm frustrated.
I'm thinking maybe EEC relay and or fuel pump relay.
Coil and Ignition pick-up test o.k., but that may change due to vibration or heat.
Any ideas.
I'm tired of chasing ghosts like this.
86 5.0EFI - F-150
I'll be driving down the road with no problem. All of a sudden, the tach drops to 0 like it loses it's signal. When I go to restart, I have to cycle the ignition key several times between the off and run position. Usually on the third cycle, it will start and run as if nothing is wrong.
The weird thing is, it only happens in the morning after it has set all night. Won't do it the rest of the day. It seems to happen during the first warm-up cycle as the truck approaches 170 degrees. After that everything is fine.
Doesn't seem to matter which tank I've got selected
Appears to be getting fuel, it restarts and runs fine until the next morning. There has been no other sign that the fuel pressure is running below normal.
When this happens, the rest of the electrical system seems to functioning.
Also, there are no codes other than the EGR, which it has had for 3 yrs now.
Mechanic is puzzled. I'm frustrated.
I'm thinking maybe EEC relay and or fuel pump relay.
Coil and Ignition pick-up test o.k., but that may change due to vibration or heat.
Any ideas.
I'm tired of chasing ghosts like this.
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JumpinJoe
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