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jopo911's Avatar
 
Join Date: Jul 2003
Location: Latrobe, PA
Posts: 108
Turbo boost gauge going crazy

My 1986 930 OEM boost gauge suddenly started going crazy. Jumps all over the place. Turbo is working properly, AFR gauge normal. Any clues what might cause this?
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Joe
1986 Black on black 930
Kokeln IC/ 1 bar spring/European Fuel Head
GHL Exhaust Dual Exhaust, Wevo shifter and coupler
935 Front Air Dam, Forgeline wheels
Old 09-28-2017, 02:18 PM
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Dmitry at Pelican Parts's Avatar
 
Join Date: Aug 2016
Location: Los Angeles, CA
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Hi Joe - take a look at the link below to earlier threads that discuss this issue. Hope you find it helpful.

930 boost gauge problem

Need a little help with boost gauge
Old 09-28-2017, 02:51 PM
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mark houghton's Avatar
 
Join Date: Jul 2008
Location: Central Washington State
Posts: 3,690
Those are good articles. At the very least check the hot and ground connection to the sending unit back on the engine (orange or faded red) rubber covered thing beneath the IC
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 09-28-2017, 05:16 PM
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Alan L's Avatar
 
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Location: New Zealand
Posts: 2,750
If you have a nil connection, the gauge is pegged. So an intermittent bad connection will give you everything in between.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
Old 09-28-2017, 11:45 PM
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