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Author Topic: Downpipe cause knock reading?  (Read 2095 times)

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Offline trashmechlv

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Downpipe cause knock reading?
« on: June 14 2013, 05:21:12 PM »
Can a downpipe vibrating against the a/c evaporator box cause false knock readings on Scanmaster?
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Mike G

87 GN, TA52, ATR headers, 3" downpipe, 80lb inj's and TT 6.1 chip, CAS V4 IC, PTC 9.5 NL, B&M transcooler, stock posi rear 3.42, Hellwig rear bar, Spohn solid LCAs on E85! 11.46@ 115mph

Offline Steve Wood

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Re: Downpipe cause knock reading?
« Reply #1 on: June 14 2013, 05:32:00 PM »
yes, indeed...or if it bangs the rear upper control arm ear
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Steve Wood

http://www.vortexbuicks-etc.com

A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline trashmechlv

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Re: Downpipe cause knock reading?
« Reply #2 on: June 14 2013, 06:04:48 PM »
Thanks, I will add clearance downpipe to my "to do list"
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Mike G

87 GN, TA52, ATR headers, 3" downpipe, 80lb inj's and TT 6.1 chip, CAS V4 IC, PTC 9.5 NL, B&M transcooler, stock posi rear 3.42, Hellwig rear bar, Spohn solid LCAs on E85! 11.46@ 115mph

Offline Steve Wood

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Re: Downpipe cause knock reading?
« Reply #3 on: June 14 2013, 09:37:08 PM »
check the drivers side engine mount...that is often the culprit that allows it to happen
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Steve Wood

http://www.vortexbuicks-etc.com

A lot of broken parts does not make you a racer; it makes you a slow learner.
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