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Old 09-07-2006, 04:14 PM   #1
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Question 95 Mustang GT engine knock

I have a stock 95 Mustang GT 5.0 engine that I bought new. Every summer in Arizona when temp. excedes 100 I get a really bad engine knock.
Tried to increase octane with 89 and 91, car only has 43,000 miles on it
and it runs perfect in the winter. Any help would be appreciated.
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Old 09-07-2006, 04:41 PM   #2
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Re: 95 Mustang GT engine knock

try running thicker oil

in the summertime I had to run 20w50 in my '89 to keep perfect oil pressure, it'd hold its own with 10w30...

but at least its worth trying a heavier weight oil
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Old 09-07-2006, 07:05 PM   #3
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Re: 95 Mustang GT engine knock

I think he might get some detonation.
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Old 09-10-2006, 04:53 PM   #4
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Re: 95 Mustang GT engine knock

Tried 20-50 and found no difference.
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Old 09-10-2006, 04:56 PM   #5
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Re: 95 Mustang GT engine knock

Have you advanced your timing at all? Try running 93 if its in your area, thats weird though..
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Old 09-10-2006, 10:38 PM   #6
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Re: 95 Mustang GT engine knock

can you hear it if you rev it up a bit under the hood?
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Old 09-12-2006, 05:33 PM   #7
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Re: 95 Mustang GT engine knock

No problem when I rev it under the hood,only when car is running at it's hottest temp. and there is a strain on the engine while driving.
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Old 09-12-2006, 07:30 PM   #8
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Re: 95 Mustang GT engine knock

Sure its not an exhaust leak?
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