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Discussion Starter #1
I know this sounds like a timing issue but I have set the timing 6000 different ways and it still rattles under load at low rpms. it is a 88 bronco with the 302ho. it runs good other than the rattle, could use a little more power but thats a different story;)
 

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Try a higher octane fuel and if that doesn't work than try checking your knock sensor.
 

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Discussion Starter #4
I normally use plus but I have gotten premiem the last 2 fill ups. where is the knock sensor on our broncos?
 

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On top of the block, behind the intake manifold near the centre

check for codes
 

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Discussion Starter #6
I had auto zone check the codes cause they do it free;) and the only code it showed was for vthe vacuum canister they said????
 

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It could be an exhaust leak,eg:cracked exhaust manifold,broken AIR check valve behind the upper intake on the pipe that is bolted to the back of the cylinder heads.If you can hear the noise under load(in gear with the brakes on and increasing the rpm slightly),it is probably an exhaust leak.
 

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Timing/tune up?
 

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does it doe it at start up? how many miles on the motor? could be piston skirt slap. and hows your oil press while pulling hard?
 

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Carb or EFI? If EFI don't forget to remove the spout before you check/set timing. Make sure you don't have a vacuum leak somewhere. I just squirt my engine while it is running with simple green. the liquid will block a vacuum leak and you will notice the idle improvement. Besides....keeps the mother clean to and is nonflammable. :toothless
 
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