Need help with '79 351W
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Joined: Jul 2007
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Need help with '79 351W
Hi I'm new here and I need some quick help. I need this truck for work tomorrow! I have a '79 F150 4x4. It has a 351W in it. Since Autozone says '79 150's never had 351W's, only 351M's... I'm guessing the engine must have been changed at some point. Well, my truck has always missed slightly, (i've had it a few months now), but yesterday my husband changed the cap and wires. He was pretty sure he'd got all the wires back on where they were supposed to go, but it was missing worse so I looked it up online and it says 1-3-7-2-6-5-4-8 for a 351W. No where did i find a firing order listed for a "1979" 351W just a 351W in general. Did different years have a different firing order or are all 351W's 1-3-7-2-6-5-4-8?
Well, I drove the truck to work today (8 miles) and it was missing horrible. Thought poor little thing was gonna die on me for sure. It's the worst when you accelerate. Once you get at a steady 50mph or so, it runs ok, but as soon as you hit the gas it misses like crazy and there's also this new weird noise. Best I can describe that noise is sounds like someone's hitting a steel pipe with a nail or something. Doesn't quite sound like an advanced timing noise, more hollow sounding if that makes any sense. Plus, the distributer wasn't moved.
Any ideas, and is that the only firing order for a 351W?
Thanks.
Well, I drove the truck to work today (8 miles) and it was missing horrible. Thought poor little thing was gonna die on me for sure. It's the worst when you accelerate. Once you get at a steady 50mph or so, it runs ok, but as soon as you hit the gas it misses like crazy and there's also this new weird noise. Best I can describe that noise is sounds like someone's hitting a steel pipe with a nail or something. Doesn't quite sound like an advanced timing noise, more hollow sounding if that makes any sense. Plus, the distributer wasn't moved.
Any ideas, and is that the only firing order for a 351W?
Thanks.
Senior User
Joined: Feb 2007
Posts: 381
Likes: 5
He is aware that the firing order on a Ford is different than a Chevy, Yes?
he could have damaged one of the wires taking it off. Check the resistance readings on all your wires, they shouldn't vary by more than a couple Ohms.
Did he replace the spark plugs? Did he check that the new plugs had the "nipple" tight? Also, the parts counter guys LIE when they say you don't need to gap new plugs.
If he didn't replace the plugs.... do it. might have fouled one (or more).
he could have damaged one of the wires taking it off. Check the resistance readings on all your wires, they shouldn't vary by more than a couple Ohms.
Did he replace the spark plugs? Did he check that the new plugs had the "nipple" tight? Also, the parts counter guys LIE when they say you don't need to gap new plugs.
If he didn't replace the plugs.... do it. might have fouled one (or more).
