Need help PLZ

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Need help PLZ

Post  Big block fox 339 on October 2nd 2012, 10:16 am

Ok I've been trying to get my bronco to run right for years now I gave up for a while now I'm back at it.

It's a freshly rebuilt 460
Stock rebuild kit
Over 30
Lunati voodoo cam 252-262 dur 530 lift
Performer intake
429 timing set
Stock ignition

It's been sitting a while after the rebuild and I decided to finish her up and get her running

So she started fine and revs fine

But it will not pull under a load it won't turn past 3k on the floor

So I checked the timing it's 13 initial 35 total

So I thought maybe its the fuel system
A buddy let me borrow a complete fuel system so it's not that.

I checked the cam it's dot to dot

Checked the compression it's 140-150 on all 8

It barely will crank now and blows back threw the carb

Could it be the stock ignition ??

I really don't know what else to check I really wanna take my little boy riding in it
So any help will be greatly appreciated

Thanks Micah
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Re: Need help PLZ

Post  jasonf on October 2nd 2012, 12:17 pm

What carb and have you put a vacuum gauge on it to see what it is doing at 3000 rpm?
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Re: Need help PLZ

Post  Big block fox 339 on October 2nd 2012, 12:25 pm

jasonf wrote:What carb and have you put a vacuum gauge on it to see what it is doing at 3000 rpm?


It's a holly 850 with a proform body and it wouldn't run with my 600 cfm holly either

It had a mechanic pump and a 600 holly it wouldn't run
I put my buddy's 850, blue pump and regulator and no change

Didn't check vacuum and it won't crank now
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Re: Need help PLZ

Post  cool40 on October 2nd 2012, 10:35 pm

did you put a new cam in it?
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Re: Need help PLZ

Post  Big block fox 339 on October 2nd 2012, 10:46 pm

cool40 wrote:did you put a new cam in it?

No sir just new lifters
That cam has been in there a while
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Re: Need help PLZ

Post  zbob on October 2nd 2012, 10:48 pm

how are you adjusting the valves?

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Re: Need help PLZ

Post  Big block fox 339 on October 2nd 2012, 10:56 pm

zbob wrote:how are you adjusting the valves?

Hmm it's been awhile since I put it together
Its stock rockers so I think just bolted down
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Re: Need help PLZ

Post  bosshoss on October 3rd 2012, 12:45 am

Plugged exhaust system?

dkp
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Re: Need help PLZ

Post  Big block fox 339 on October 3rd 2012, 6:04 am

bosshoss wrote:Plugged exhaust system?

dkp

I dont think so it has Open headers lol
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Re: Need help PLZ

Post  bosshoss on October 3rd 2012, 9:33 am

When you say it wont crank. Do you mean the starter engages but will not turn the engine over or there is nothing happening at all.
If the starter is having trouble turning it over is it siezed? Pistons to tight in bores? Bearings to tight on crank? mechanical binding?

dkp
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Re: Need help PLZ

Post  Big block fox 339 on October 3rd 2012, 9:37 am

bosshoss wrote:When you say it wont crank. Do you mean the starter engages but will not turn the engine over or there is nothing happening at all.
If the starter is having trouble turning it over is it siezed? Pistons to tight in bores? Bearings to tight on crank? mechanical binding?

dkp

No sir spins fine just spitting and sputtering and popping out the carb.
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Re: Need help PLZ

Post  res0rli9 on October 3rd 2012, 1:31 pm

Check timing, broke cam pin maybe ?

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Re: Need help PLZ

Post  Big block fox 339 on October 3rd 2012, 3:04 pm

res0rli9 wrote:Check timing, broke cam pin maybe ?


Both are good

Timing is 13&35
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need some help

Post  1970 ford maverick on October 3rd 2012, 3:11 pm

OK, have you thought about a new set of "Autolites"?, just a thought,MavMan
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Re: Need help PLZ

Post  Big block fox 339 on October 3rd 2012, 3:20 pm

1970 ford maverick wrote: OK, have you thought about a new set of "Autolites"?, just a thought,MavMan

They really ain't old but they are soot black
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Re: Need help PLZ

Post  4604X4 on October 3rd 2012, 4:44 pm

Bad fuel? How long has it been sitting? If it's over 3 months get some fresh gas.
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Re: Need help PLZ

Post  Big block fox 339 on October 3rd 2012, 4:49 pm

4604X4 wrote:Bad fuel? How long has it been sitting? If it's over 3 months get some fresh gas.


My fuel is old so I by passed it with a small jug still wouldn't turn pass 2500 rpm
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Re: Need help PLZ

Post  1970 ford maverick on October 3rd 2012, 4:54 pm

Big block fox 339 wrote:
1970 ford maverick wrote: OK, have you thought about a new set of "Autolites"?, just a thought,MavMan

They really ain't old but they are soot black
I would change the plugs,if that don't help I would change the dizzy,do you have the vac. hooked up,and where?,maybe check your power valve also, I,ve had coils to drive me crazy too, so it may take some trouble shooting here. Hope this helps,MavMav
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Re: Need help PLZ

Post  Big block fox 339 on October 3rd 2012, 5:17 pm

1970 ford maverick wrote:
Big block fox 339 wrote:
1970 ford maverick wrote: OK, have you thought about a new set of "Autolites"?, just a thought,MavMan

They really ain't old but they are soot black
I would change the plugs,if that don't help I would change the dizzy,do you have the vac. hooked up,and where?,maybe check your power valve also, I,ve had coils to drive me crazy too, so it may take some trouble shooting here. Hope this helps,MavMav

When I get to go back to the shop I'm gonna stick another dizzy and a msd ignition on it and try that.
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Re: Need help PLZ

Post  res0rli9 on October 3rd 2012, 8:50 pm

Big block fox 339 wrote:
1970 ford maverick wrote:
Big block fox 339 wrote:
1970 ford maverick wrote: OK, have you thought about a new set of "Autolites"?, just a thought,MavMan

They really ain't old but they are soot black
I would change the plugs,if that don't help I would change the dizzy,do you have the vac. hooked up,and where?,maybe check your power valve also, I,ve had coils to drive me crazy too, so it may take some trouble shooting here. Hope this helps,MavMav

When I get to go back to the shop I'm gonna stick another dizzy and a msd ignition on it and try that.

and change them plugs

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Re: Need help PLZ

Post  69F100 on October 4th 2012, 12:20 am

x2 on the coil soundd like it is not firing right
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Re: Need help PLZ

Post  Big block fox 339 on October 4th 2012, 9:17 am

res0rli9 wrote:
Big block fox 339 wrote:
1970 ford maverick wrote:
Big block fox 339 wrote:
1970 ford maverick wrote: OK, have you thought about a new set of "Autolites"?, just a thought,MavMan

They really ain't old but they are soot black
I would change the plugs,if that don't help I would change the dizzy,do you have the vac. hooked up,and where?,maybe check your power valve also, I,ve had coils to drive me crazy too, so it may take some trouble shooting here. Hope this helps,MavMav

When I get to go back to the shop I'm gonna stick another dizzy and a msd ignition on it and try that.

and change them plugs

O yes
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Re: Need help PLZ

Post  Big block fox 339 on October 4th 2012, 9:19 am

69F100 wrote:x2 on the coil soundd like it is not firing right


I'm gonna change the coil put in a 6al and try a different dizzy.
I'm gonna start over from scratch check firing order and everything
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Re: Need help PLZ

Post  4604X4 on October 4th 2012, 12:21 pm

Big block fox 339 wrote:
4604X4 wrote:Bad fuel? How long has it been sitting? If it's over 3 months get some fresh gas.


My fuel is old so I by passed it with a small jug still wouldn't turn pass 2500 rpm

Be sure to drain the old fuel from the carb to (remove a lower fuel bowl moutning bolt to drain -or better yet remove the bowls and clean out). I just went through this myself a month ago. Old gas can make a big mess in the carburator.
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