429 shutting off
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Elder User
Joined: May 2011
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429 shutting off
I have a 1991 F-800 with a 429 that is giving me some problems. It is shutting down after it gets warm. I was hauling a load of rock and it cut off on me three times. It would be running great and just act like you cut off the switch. I could pull off the road, put my brake on, cut off the switch, and let it set for 30 seconds, and it start right back up and would run fine for about ten minuets. It did not do it on me at all till I was 20 miles from home on a 60 mile trip. I am figuring it is something electrical, but anyone have any idea what it is?
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Super Moderator
Joined: Apr 2004
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Possibly the ignition module. Should be mounted on the fender on the driver side. Trace wires from the distributor to find it. The "TFI" system has a history of failures similar to yours, as well as total failures--usually while you are crossing a RR track or in the left lane of a freeway....
FTE Leadership Emeritus
Joined: Jul 2002
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From: Long Island USA
Yeah, I bet it's the ignition module too...
When it does this, and won't start, I've put a bag of ice directly on the ignition module to cool it off, and see if it starts. Of course, a bag of ice is hard to come by on the side of the road. A "cold pack" from a first-aid kit would probably work too...
When it does this, and won't start, I've put a bag of ice directly on the ignition module to cool it off, and see if it starts. Of course, a bag of ice is hard to come by on the side of the road. A "cold pack" from a first-aid kit would probably work too...
Tuned
Joined: Jan 2012
Posts: 471
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From: Mount Vernon, KY
In my 89' F-700 with the 429 I had a similar problem. It would die randomly and then after some time start up again. It eventually quite starting up. I replaced the ignition switch that is lower on the column that the rod runs to. It started up fine after that and ran good until it got a crack in the block.
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From: Long Island USA
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New User
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Does your truck have the tilt hood were is the module located?
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New User
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Thanks for the info mine is a 1998 and they changed location of the module its behind a plate on the fire wall on this one.
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