cousins 71
Lead Driver
Joined: Aug 2003
Posts: 7,592
Likes: 10
From: **** hole San Jose ca.
Then it keeps dying out until you let off the gas pedal again.?
Then the motor comes back to life slowly until you put your heavy foot into gas pedal again?
If yes, to this post then, I'd say the exh. seats are starting to burn out..
orich
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
40-45 lbs oil pressure on mechanical gauge at highway speeds goes up to 55-60.....used a brand new coil and then an older used coil and then the one off of my truck....he has drove the truck for 6 months prior to this issue with no problems and it only started doing this a couple weeks after he ran it out of oil...... and could you go a little more in depth on your number 2. JEFFFAFA
Usually when an engine idles and revs fine but falls on it's face under load it is running out of spark or fuel.
Laughing Gas
Joined: Mar 2013
Posts: 1,027
Likes: 5
From: Garner NC
1. Jiggle the key while it's running in the driveway and you have your foot on the gas. A loose ignition switch or electrical connection to the coil will cause your issue.
2. Put the rear up on jack stands and run the truck in gear. That will eliminate road vibration. If it runs good there look for a loose connection or worn through insulation on the wires feeding the coil.
2. Put the rear up on jack stands and run the truck in gear. That will eliminate road vibration. If it runs good there look for a loose connection or worn through insulation on the wires feeding the coil.
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Fleet Mechanic
Joined: May 2012
Posts: 1,724
Likes: 1
From: peru kansas
that's one gauge i don't have in my arsenal (a vacuum gauge) and i don't think his dad has one either
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Fleet Mechanic
Joined: May 2012
Posts: 1,724
Likes: 1
From: peru kansas
they are new and the carb is not running out of gas, fuel problems have been eliminated as far as we can figure its more like it drops down to like 6-7 cylinders at certain rpms sounding like crap but other than the #8 plug which notoriously fouls every other week on this truck and is also the same one with slightly lower compression reading, but it really seems like its possibly cam related or fire related due to being able to adjust how and when it cuts out (higher or lower rpm) by adjusting the timing and the thing that gets me the most is that it ONLY STARTED doing this after he ran it out of oil
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
Off the wall here Smokin. Put your timing light on it and check to see if the timing mark bounces around. Both at idle and at about 1500RPM. Maybe when there was no oil it prematurely wore out the timing chain and/or gears. Retarding/advancing the cam.
Post Fiend
Joined: Apr 2008
Posts: 5,338
Likes: 3
From: Grants Pass, Oregon
1. Jiggle the key while it's running in the driveway and you have your foot on the gas. A loose ignition switch or electrical connection to the coil will cause your issue.
2. Put the rear up on jack stands and run the truck in gear. That will eliminate road vibration. If it runs good there look for a loose connection or worn through insulation on the wires feeding the coil.
2. Put the rear up on jack stands and run the truck in gear. That will eliminate road vibration. If it runs good there look for a loose connection or worn through insulation on the wires feeding the coil.
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Fleet Mechanic
Joined: May 2012
Posts: 1,724
Likes: 1
From: peru kansas
think we got it figured out...... we had replaced all the wire from firewall forward well he brought it over and i looked inside the cab and found a place where the no-longer existing grommet was the wire was old and brittle and i assume it was grounding out against who knows what under the dash (explains why we didn't see any sparks under the hood) and i removed the little angle plug that hooks up to the coil and used a new connector and 1 long piece of wire (instead of 3 splices) and the truck hasn't done it since that we can tell so thanks fellas
Cargo Master
Joined: Sep 2005
Posts: 2,954
Likes: 64
Your spending alot of time on that, pull of the valve covers and check the valve lift. Easy to do and eliminate that as an issue. I can't think of anything else that lack of oil pressure would cause to creat the problems you're having, so it's worth a shot. VC gaskets are cheap.
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