Cutting out after driving for a while
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Mountain Pass
Joined: Sep 2019
Posts: 109
Likes: 8
Cutting out after driving for a while
I have a 1986 F-150 5.0 efi 4x4 with AOD transmission. When you crank the truck it runs great. If you only drive for 20-25 min it does perfect. If you park and let it cool down it still perfect. But if you drive it for over 25-30 min it starts to cut out under load. So when you take off at a light or get in it to pass it will sputter/cut out. But once moving at a cruising speed it will drive for an hour as smooth as ever. Just don’t stop and have to take off or put your foot in it because it will fall on its face. It has new fuel filter and injectors in the last 2 months. Pumps are about 6 months old. Any ideas? Thanks as always.
Lead Driver
Joined: Jun 2013
Posts: 5,667
Likes: 1,159
From: Tolland, CT
So getting hot, on the side of the distributor is a ignition module, that may be the issue when it gets hot. There have been other threads here recently with the same kinds of issues.
If that is the issue, make sure you buy a good replacement, not a cheap one.
https://www.napaonline.com/en/p/ECHTP31 NAPA has three of them.
https://www.google.com/search?q=how+...hrome&ie=UTF-8
But wait for one of the experts to chime in, they may have some trouble shooting steps.
If that is the issue, make sure you buy a good replacement, not a cheap one.
https://www.napaonline.com/en/p/ECHTP31 NAPA has three of them.
https://www.google.com/search?q=how+...hrome&ie=UTF-8
But wait for one of the experts to chime in, they may have some trouble shooting steps.
Lead Driver
Joined: Nov 2013
Posts: 7,174
Likes: 1,174
A priest and a rabbi walk into a bar...
If you're going to tell a joke (a part must be good because it's new) then so will i.
All seriousness aside, I've no definitive plan to find the root cause, but don't automatically rule out a problem at the tank. The quality on some Chinese parts is dismal. There's no guarantee a shiny new Fling Dung brand tank hasn't started rusting already, especially with modern fuels with corrosive ethanol.
Just a thought, but rust particles could be collecting on the pickup tube sock inside the tank after a long drive. Shut off the engine, vacuum ceases, and the debris falls off to await the next.cycle. Maybe the restriction only becomes a problem after a long drive, and is not related to heat. You would not see much of anything on the external filter, as the sock is catching most of it. Just a hunch, so don't read too much into it.
If I had to place a bet, I'd suspect the ignition module. Do you.the Duraspark or TFI system? Either way, it might be worth gambling on a new module. As previously mentioned, get a quality name brand, not the cheapest offering.
If you're going to tell a joke (a part must be good because it's new) then so will i.
All seriousness aside, I've no definitive plan to find the root cause, but don't automatically rule out a problem at the tank. The quality on some Chinese parts is dismal. There's no guarantee a shiny new Fling Dung brand tank hasn't started rusting already, especially with modern fuels with corrosive ethanol.
Just a thought, but rust particles could be collecting on the pickup tube sock inside the tank after a long drive. Shut off the engine, vacuum ceases, and the debris falls off to await the next.cycle. Maybe the restriction only becomes a problem after a long drive, and is not related to heat. You would not see much of anything on the external filter, as the sock is catching most of it. Just a hunch, so don't read too much into it.
If I had to place a bet, I'd suspect the ignition module. Do you.the Duraspark or TFI system? Either way, it might be worth gambling on a new module. As previously mentioned, get a quality name brand, not the cheapest offering.
Thread Starter
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Mountain Pass
Joined: Sep 2019
Posts: 109
Likes: 8
Thank You! I will check that. I’ve never had one do this. They have always just quit working completely on me. But I will check it out.
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FTE Legend
Joined: Nov 2015
Posts: 30,912
Likes: 4,123
From: Angier, NC
Max & Karl both have good info.
Starting with fuel I cant see the tank rusting in 1 year unless it is really really chaep.
Now a bad in tank pump I can see going bad in a years' time. After it runs for a bit it heats up and starts to fail
I had a EFI garden tractor with a in tank pump that after1.5 hours of cutting a 3 hour yard it would start to surge then just shut off.
I found this by using a fuel PSI testing gauge and have it out where I could see it and sure enough when it was surging the fuel PSI was bouncing down to 0 till it stop running.
I would check the fuel PSI when this starts to happen. Long hose so you can put the gauge on the windshield to be seen and go for a drive.
Might try removing the gas cap to see if this helps but thinking it may not but its free.
The TFI in the dist. I can also see doing this the most but they just shut down till it cools off and restarts.
Then again we have seen some strange things happening both with the TFI and DSII boxes.
They are the 2 timings I can think of for now.
Oh a far shot maybe a pickup coil in the dist. or main coil (not that I seen one go bad like this before) heating up and failing?
Dave ----
Starting with fuel I cant see the tank rusting in 1 year unless it is really really chaep.
Now a bad in tank pump I can see going bad in a years' time. After it runs for a bit it heats up and starts to fail
I had a EFI garden tractor with a in tank pump that after1.5 hours of cutting a 3 hour yard it would start to surge then just shut off.
I found this by using a fuel PSI testing gauge and have it out where I could see it and sure enough when it was surging the fuel PSI was bouncing down to 0 till it stop running.
I would check the fuel PSI when this starts to happen. Long hose so you can put the gauge on the windshield to be seen and go for a drive.
Might try removing the gas cap to see if this helps but thinking it may not but its free.
The TFI in the dist. I can also see doing this the most but they just shut down till it cools off and restarts.
Then again we have seen some strange things happening both with the TFI and DSII boxes.
They are the 2 timings I can think of for now.
Oh a far shot maybe a pickup coil in the dist. or main coil (not that I seen one go bad like this before) heating up and failing?
Dave ----
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Lead Driver
Joined: Jun 2013
Posts: 5,667
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From: Tolland, CT
Another thing to think about, how old is the distributor ? Mine was replaced about 10 years ago, with a rebuilt one. Gee, just checked my records, May 2014, 3000 miles ago.
It had all new parts in/on it.
It had all new parts in/on it.
FTE Legend
Joined: Nov 2015
Posts: 30,912
Likes: 4,123
From: Angier, NC
I had an issue with the plates the pickup coil is mounted to it was missing the bushings to keep it level when it moved for advancing.
I also had a miss under load so figured I would change it out. I got a name brand part, Standard. Well when I went to start the truck the star thingy hit the coil and would hardly run.
I ended up making 1 good one from the 2 but for some reason when I dropped the distributor back in and lined up the marks I made it ran like crap.
The timing was way off, not 1 tooth maybe half a tooth, so I had to turn the dist just to get it to run / idle so I could use the timing light.
So I would not go changing parts till I knew 99% it was bad like a dist. Swap in a DSII box or TFI unit, fine just get top of the line parts but the dist I would hold off on till you knew it was bad.
I cant see a dist being bad to cause his problem at this time.
Dave ----
Moderator
Joined: Jan 2001
Posts: 56,984
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From: Virginia
I agree with Fuzz. It may have looked good on the outside, but they do not do much to them on the inside, especially here lately. You must have gotten a good one that was turned in.
Thread Starter
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Mountain Pass
Joined: Sep 2019
Posts: 109
Likes: 8
Problem Solved!!
Turns out the only 2 month old fuel filter had completely fallen apart on the inside. I decided to change it even though I knew it only had maybe 150 miles on it. When I removed it from the truck it rattled when shook. So I opened it up and the filter itself was just in a wad/ball. And there was a metal disk inside also that was making the rattle. I’ve never seen one do this but changed it out and she is back to running great. Thanks everyone for the help.
FTE Legend
Joined: Nov 2015
Posts: 30,912
Likes: 4,123
From: Angier, NC
It suc* you cant get good parts anymore.
Who made the filter and part number and take it you did not use the same on the change?
I had seen issues with Frame oil filters from the fast oil change place on my 02 Dodge only after about 1000 miles the oil gauge would read lower than normal at high way speeds, never a good thing.
The dealer would use a different filter and never a problem. After it happened the second time I never went bake to the quick change.
Frame used to be a good filter NO MORE!
Orange can of death!
Dave ----
Who made the filter and part number and take it you did not use the same on the change?
I had seen issues with Frame oil filters from the fast oil change place on my 02 Dodge only after about 1000 miles the oil gauge would read lower than normal at high way speeds, never a good thing.
The dealer would use a different filter and never a problem. After it happened the second time I never went bake to the quick change.
Frame used to be a good filter NO MORE!
Orange can of death!
Dave ----
Thread Starter
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Mountain Pass
Joined: Sep 2019
Posts: 109
Likes: 8
The one that I relived was a duralast from the AutoZone. Not knowing if it was the problem u til after I removed it I had already bought the new one. But it came from oreillys. So hopefully it will last longer than 150 miles. lol
Lead Driver
Joined: Nov 2013
Posts: 7,174
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Great find! Got pictures? Was this filter like the one seen in post #2 above? Or was it a different arrangement?
I'll have to file this under "Yet another new part that failed". I'm working on a prototype for a animatronic arm that attaches to your computer or tablet. It slaps you around if you type "must be good because it's new" or any similar phrase. The prototype uses AI intelligence and off the shelf mechanical parts. If successful, I'll lobby Congress to make this device mandatory on all computers. Just working out the bugs with the prototype. Some of the parts installed were bad from stock. Took me a while to realise that.
I'll have to file this under "Yet another new part that failed". I'm working on a prototype for a animatronic arm that attaches to your computer or tablet. It slaps you around if you type "must be good because it's new" or any similar phrase. The prototype uses AI intelligence and off the shelf mechanical parts. If successful, I'll lobby Congress to make this device mandatory on all computers. Just working out the bugs with the prototype. Some of the parts installed were bad from stock. Took me a while to realise that.