Vapor locked?
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Vapor locked?
I have a 390fe in my 66 f-100. It fires up great in the morning or when it sits for awhile, but after i drive it for a bit and get it to operating tempt and stop for gas for something at the store, come back to truck, it doesnt want to start, it has almost a low battery type of cracking then it picks up and fires up fine after a few secs of cranking.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
I bet you have an aluminum intake, and it is boiling the gas out of the carb.
Add a 1" phenolic spacer under the cab and the issue should go away, make the truck run a little sweeter too.
John
Add a 1" phenolic spacer under the cab and the issue should go away, make the truck run a little sweeter too.
John
Lead Driver
Joined: Jan 2003
Posts: 9,893
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From: Ohio
"Add a 1" phenolic spacer under the cab"
Well John, I don't think raising the "cab" up will help with the hot start problem..........
Ok.......just pulling your lariat...........
(see Art, I don't just pick on you)
Sounds kinda like both problems. Weak starter(check cables too), plus fuel boiling which will make it harder to start even after cranking. It'll have extra fuel puddled up in the cylinders which is hard to compress.
Stock motor? Autolite 2bbl? Still needs some kind of insulator under carb. My 352 was HORRIBLE for this.
Well John, I don't think raising the "cab" up will help with the hot start problem..........
Ok.......just pulling your lariat...........
(see Art, I don't just pick on you)
Sounds kinda like both problems. Weak starter(check cables too), plus fuel boiling which will make it harder to start even after cranking. It'll have extra fuel puddled up in the cylinders which is hard to compress.
Stock motor? Autolite 2bbl? Still needs some kind of insulator under carb. My 352 was HORRIBLE for this.
Lead Driver
Joined: Oct 2004
Posts: 8,062
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From: Central Oregon
[quote=cmoorehead78;7092665]well sounds like the easy check is the timing, which in it self is pain since the idiot that helped rebuild the motor installed the crank 180 out 
quote]
I have not herd this before, can you explain?
quote]
I have not herd this before, can you explain?
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
The cam timing is 180degs out. The timing chain was installed with timing marks in oppposite location(instead of close together). Still runs fine, but the TDC mark for #1 is now 180 degs out(bottom of the damper now).
I've heard of this before, but never dealt with it. Can you remark the damper after finding TDC on #1(using piston stop) and putting a scribe mark at your timing tab? Put the stop in, rotate til piston hits, mark at tab, rotate around backwards, mark at tab. Then measure between and remark your new TDC. Make sense? You'll have to use a timing light with a dial on it to get the degrees, but at least you'll have TDC.
I've heard of this before, but never dealt with it. Can you remark the damper after finding TDC on #1(using piston stop) and putting a scribe mark at your timing tab? Put the stop in, rotate til piston hits, mark at tab, rotate around backwards, mark at tab. Then measure between and remark your new TDC. Make sense? You'll have to use a timing light with a dial on it to get the degrees, but at least you'll have TDC.
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From: Long Island USA
What's the FE firing order? 1-5-4-2-6-3-7-8
Wouldn't it be easier to use cylinder # 6 for timing it?
Wouldn't it be easier to use cylinder # 6 for timing it?
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Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
Yall say what you want, but it corrected the same problem for me instantly, when I added one under the carb.
John
Lead Driver
Joined: Jan 2003
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From: Ohio
See John, I was making sure it wasn't just ART that I picked on for goofy posts. 
My '67 was horrible for vapor lock. I put a 1" spacer and it helps alot, though it still kinda was rough sometimes.
I was wondering if #6 would do it also? Wasn't sure(never tried it), so didn't want to lead anyone astray.
My '67 was horrible for vapor lock. I put a 1" spacer and it helps alot, though it still kinda was rough sometimes.
I was wondering if #6 would do it also? Wasn't sure(never tried it), so didn't want to lead anyone astray.
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