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Old 02-21-2010, 08:43 AM
morris_506 morris_506 is offline
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4.6L Engine Rattle when accelerating.

I have a 98 f-150 4.6L 5spd that has a wierd rattling noise coming from what sounds like the engine. The noise will only happen when the truck is in gear and under a load. It will not happen if I keep the RPM's low, unless I am going up a hill. When I rev the truck in neutral, the rattling noise isn't there. Also when I'm driving and hear the ratling noise it will go away when i push the clutch in(which im guessing takes the load off) but will come back when i let out on the clutch. Seems to happen most when I'm in gear and trying to accelerate. Any help would be much appreciated!!!
Thanks.
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Old 02-21-2010, 08:57 AM
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torkum torkum is offline
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New plugs and mid grade fuel might fix it. Probably detonation happening or alot of carbon build up on the valves.
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Old 02-21-2010, 09:00 AM
morris_506 morris_506 is offline
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Thanks. I am definitly gonna start there. I will post again and let you know how it worked!!!
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Old 02-21-2010, 09:22 AM
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If you've never replaced the plugs on a Triton before do research on how to do it. Make sure the motor is overnight cold, vacuum out the plug holes before pulling, use plenty of penetrating oil, and make slow 1/4 turns. Don't over tighten when replacing them and fill the spark plug boots with dielectric grease.
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Old 03-20-2010, 09:11 PM
morris_506 morris_506 is offline
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Hey there,
I replaced the plugs and the wires and it still has a rattling sound when accelerating or under load. Could it be a partially blocked catalyic converter causeing this rattle. I am also getting p0171 and p0174 error codes.
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Old 03-20-2010, 10:03 PM
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drive the truck until running on fumes and fill it with the high octane fuel. mine does that when it runs on regular. id almost guarantee it will fix it.
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Old 03-21-2010, 07:59 PM
Mike-G Mike-G is offline
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I have the notorious exhaust stud rusted away issue and my truck sounds it's worst when I pedal down. Might want to take a look at your exhaust manifolds.
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Old 03-21-2010, 07:59 PM
 
 
 
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