Bronco Problems
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Joined: Jul 2000
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Bronco Problems
[font size="1" color="#FF0000"]LAST EDITED ON 30-Nov-00 AT 02:27 AM (EST)[/font][p]I've got an '89 Bronco with a 302, only engine mods are JBA headers. Recently it's been behaving sluggishly and developed a whistle, which changes in tone when the gas pedal is depressed. Also, it knocks when accelerating up grades. Upon shutting down the engine, it lets out what sounds like a breath of air, and makes a ticking noise that almost sounds like valves moving (starts rythmically, then slows, then stops, as if many things were ticking, then less, until none). The breath and the ticking were first noticed right after a service to replace a header gasket and repair some cracking in the header where it meets the exhaust pipe. At least two (maybe more, havent checked yet) of the spark plug wires are discolored and cracked thru at the boot on the spark plug end. Could that be related? Also, there is a known exhaust leak from the EGR tube, leading from the EGR into the intake manifold. Any thoughts would be appreciated, thanks. I Have also posted this in the Big Broncos fourm.
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Joined: Jul 1999
Posts: 3,172
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Bronco Problems
Id say the ticking noise you hear is the spark grounding on the engine instead of the spark plug ....this would explain the poor preformance . As for the whistling noise , it may be an intake leak . Replace the plug wires with ones than can withstand the heat from the headers & drive the truck & try & isolate the other noise . You can spray some carb cleaner around the intake to check for leaks , but be careful with it around hot areas of the engine .
