annoying spark knock
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More Turbo
Joined: Jan 2010
Posts: 685
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From: Western NC mountains
annoying spark knock
My '96 300 has got an aggrevating spark knock. Full throttle with a load or up hills and it rattles bad. Changed distributor twice. I can back the timing way off and cure it but i lose a lot of power. Used some water to decarbon but will use seafoam next. As i dont have a light and set by full throttle pulls and listen, i can t give exact timing numbers. Ive lost at least 10mph crossing a hill every day the way it is set now.(in 5th gear). I replaced egr solenoid. Thinking of trying some colder plugs. The hotter the outside temp the worse it does it. Before my original dist. trouble it didnt do it.
Elder User
Joined: Mar 2003
Posts: 788
Likes: 1
From: Hendersonville, TN
My '96 300 has got an aggrevating spark knock. Full throttle with a load or up hills and it rattles bad. Changed distributor twice. I can back the timing way off and cure it but i lose a lot of power. Used some water to decarbon but will use seafoam next. As i dont have a light and set by full throttle pulls and listen, i can t give exact timing numbers. Ive lost at least 10mph crossing a hill every day the way it is set now.(in 5th gear). I replaced egr solenoid. Thinking of trying some colder plugs. The hotter the outside temp the worse it does it. Before my original dist. trouble it didnt do it.
Elder User
Joined: Mar 2003
Posts: 788
Likes: 1
From: Hendersonville, TN
No easy way to clean it out. It's pretty much a manual chipping out of the carbon. I soaked it in a big tub of half water and half purple power cleaner and pulled out every now and then to chip away the loose stuff. I had the engine on a stand building, so I had time, but it took a while and was a serious PITA. I'd say the runners were at least 50% blocked when I started.
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