need help with loud noise
Thread Starter
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New User
Joined: Feb 2007
Posts: 23
Likes: 0
need help with loud noise
hi i just bought a 78 ford bronco with a 351m with 96,000 miles from the original owner. it runs great but it has a vary loud squealing noise that is driving me nuts. i replaced the plugs,wires,cap,button,belts, and oil when i got it. i also removed all the old vac lines that i did not need. i ran it with out the belts and no mater what i do still have the noise. i have one idea left and that is the distributor. there is a lot of play in the button when i move it back and forth. i think that maybe the distributor is junk and making the noise. i dont know i just need some help
thanks bruce dye
thanks bruce dye
Cargo Master
Joined: Nov 2009
Posts: 2,364
Likes: 117
From: starship enterprise
I had one do this one time. It was an intake leak. I didn't have time to fix it right but I had ae edelbrock 4 bbl intake and carb, I took the 30 minutes and swapped them and that fixed it. I would say go climb a hill on the highway and see if under acceleration climbing the hill it goes away or diminishes slightly then it is vaccuum related.
Senior User
Joined: Nov 2012
Posts: 225
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From: N,Ga
You said "It runs great" If so it's not a vac leak. But, you could spray starting fluid around the intake area- gasket area. If the motor smooth's out, you have a vac leak. If not then look for something else. Check to see if you have a bent pulley, if could be rubbing something as it turn's.
Thread Starter
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New User
Joined: Feb 2007
Posts: 23
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its not the starter because it does not go away. i dont think it is a pulley because i took off both belts just to make sure it was not any of that stuff.
it does ideal well. starts easy.
it does ideal well. starts easy.
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Fleet Mechanic
Joined: Apr 2012
Posts: 1,275
Likes: 134
If the started stuck in, the noise wouldn't go away as long as the engine was running. Next time after you start it, take the cable off the selonid that goes to the starter, if it quits, thats the problem, if not keep secrhing.
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Fleet Mechanic
Joined: Feb 2010
Posts: 1,742
Likes: 5
From: Near St. Joseph,MO
you replaced the belts, are they tightened correctly? Also, I've had alternators squeal before dying and currently have my power steering pump squealing quite a bit. I'd check those, or maybe even the water pump?
Cargo Master
Joined: Nov 2009
Posts: 2,364
Likes: 117
From: starship enterprise
I thought he said he ran it with no belts and the noise presisted, I don't think it is belt or pulley related. I had a 400 make a whistle sound and it ran fine. It was an intake leak and I fixed it myself, but it ran perfect with the intake leak, you guys never seeing it doesn't prove it is impossible, Me having it happen proves that it is possible.
Cargo Master
Joined: Apr 2009
Posts: 3,038
Likes: 4
From: South west Idaho
I don't think it is pulley or belt related. If it was the starter spinning with the engine it would be ruined by now. May be intake leak or base of carb. I bought a rebuild carb once, 2 bl. motor craft, it had an unusual air or vac leak in it . It ran good , just made that noise and it bothered me enough that i took it back and told them it was bad, got another one , no noise.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 785
From: Simi Valley, CA
Dealer A/C uses a different pulley (D8RZ-8678-A) than factory A/C (D8OZ-8678-A) which is the same as 1973/79 V8 Passenger Cars (all, except 460's).
Cargo Master
Joined: Apr 2009
Posts: 3,038
Likes: 4
From: South west Idaho
[quote=brucemdye;12791186]hi . i ran it with out the belts
thanks bruce dye[/quot
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O.K. you ran it with out the belts ? But the crank is still turning, so is the crank balance or the pulleys on it rubbing the timing tag or a bracket of some sort ?
thanks bruce dye[/quot
__________________________________________________ ______________
O.K. you ran it with out the belts ? But the crank is still turning, so is the crank balance or the pulleys on it rubbing the timing tag or a bracket of some sort ?
