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Try new plugs
Posted by DrewP [Email] (more from DrewP) on Mon, 23 Aug 2010 09:20:59
In Reply to: Re: Pre-igntion/ Detination.? 9-5 culprits?, LUKE, Sat, 21 Aug 2010 14:12:10
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Try new plugs first, it's cheapest an easiest.
Double and triple check very carefully there are no air leaks anywhere in the intake and PCV and EVAP lines, check the big rubber cold side intercooler hose, the corner that faces the turbo gets hot and starts to desintegrate and can cause air leaks.
Make sure the little red fittings for the brake booster lines are snug, and none of the vacuum hoses are cracked where they turn corners.
Barring a bad AMM can cause it, but don't go buy one till you rule everything else out, they're expensive, maybe you can find a used one or borrow one to test ahead of time.
Best,
Drew
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