Help please! 351W ho
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Help please! 351W ho
I bought a 1984 Ford f150 xlt today with a 351W ho with the original holley carb, It fired right up when we arrived, test drove it, inspected it at gas station, cut it off and on several times, bought the truck, stopped at 2 gas stations in virginia, cranked right back up everytime, then continued to drive it back to north carolina, bout an hour and 40 minutes, I was almost back home and it all of sudden seemed to have lost power for a few seconds and back fired, i pulled over and checked it out, seemed okay and it did fine for the last 15 minutes of driving. Parked it and didnt let it idle at all, cut it right off, bout 15 minutes later, it wouldnt start. Seemed like the carb was flooded, shot with a little starting fluid and it was fine. Let it idle and it eventually died after about 10 minutes of sitting. Had to shoot it with starting fluid again. Truck has plenty of power! Just wanted some help, I'm thinking that the long ride home possibly let too much gas build up? and i parked it. Any suggestions? Im guessing idle needs to be adjusted down.
Laughing Gas
Joined: Apr 2013
Posts: 1,047
Likes: 63
Losing power and backfiring just cruising down the highway on a long trip suggests ignition to me. Just had a coil go bad that was like that. Dura-spark ignition modules will do that too but usually they'll just shut down until they cool off.
If it's new to you a complete inspection of cap, rotor, wires and plugs is in order.
If it's new to you a complete inspection of cap, rotor, wires and plugs is in order.
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
Do you have a fuel pressure regulator on it? Eddy's like 6 psi or less, but most pumps put out 7+. So Edelbrock recommends using a fuel pressure regulator set at 5.5 psi.
On the other hand, it isn't too unusual to have dirt in the fuel system. How long did this set before you bought it? Pull the top off the carb and see how much gunk is in the bowl. If there's a lot then put two fuel filters on, one ahead of the pump and one after.
On the other hand, it isn't too unusual to have dirt in the fuel system. How long did this set before you bought it? Pull the top off the carb and see how much gunk is in the bowl. If there's a lot then put two fuel filters on, one ahead of the pump and one after.
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Do you have a fuel pressure regulator on it? Eddy's like 6 psi or less, but most pumps put out 7+. So Edelbrock recommends using a fuel pressure regulator set at 5.5 psi.
On the other hand, it isn't too unusual to have dirt in the fuel system. How long did this set before you bought it? Pull the top off the carb and see how much gunk is in the bowl. If there's a lot then put two fuel filters on, one ahead of the pump and one after.
On the other hand, it isn't too unusual to have dirt in the fuel system. How long did this set before you bought it? Pull the top off the carb and see how much gunk is in the bowl. If there's a lot then put two fuel filters on, one ahead of the pump and one after.
pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
Powervalve if it backfired.
Probably wise to install the check valve retrofit while you have it apart, so it doesn't happen again.
Probably wise to install the check valve retrofit while you have it apart, so it doesn't happen again.
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pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
As a straight across swap?
A 600 cfm Holley like in my sig is easiest.
You need to swap your existing low voltage Motorcraft choke element over.
Rerout the PCV to the rear and trim the metal fuel line so you can add an inline inlet filter.
Eddy's may be easier to tune, but throttle linkages, choke relays etc... add a lot to the installation.
A 600 cfm Holley like in my sig is easiest.
You need to swap your existing low voltage Motorcraft choke element over.
Rerout the PCV to the rear and trim the metal fuel line so you can add an inline inlet filter.
Eddy's may be easier to tune, but throttle linkages, choke relays etc... add a lot to the installation.
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
As a straight across swap?
A 600 cfm Holley like in my sig is easiest.
You need to swap your existing low voltage Motorcraft choke element over.
Rerout the PCV to the rear and trim the metal fuel line so you can add an inline inlet filter.
Eddy's may be easier to tune, but throttle linkages, choke relays etc... add a lot to the installation.
A 600 cfm Holley like in my sig is easiest.
You need to swap your existing low voltage Motorcraft choke element over.
Rerout the PCV to the rear and trim the metal fuel line so you can add an inline inlet filter.
Eddy's may be easier to tune, but throttle linkages, choke relays etc... add a lot to the installation.
As for the issues with an Eddy, if he's using a stock intake will there be issues with the throttle linkage? I know there are issues when using an aftermarket intake, but it is the intake and not the carb causing the problem - right?
But, I agree on the choke. Swapping the 7v unit from the 4180 to a 4160 would be easiest.
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