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930s rule the wasteland
Join Date: Dec 2006
Location: Spotsylvania ,Virginia
Posts: 1,219
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reference and rpm signals?
bought 83 944, motor turns, no fuel in tank and previous owner smoked fuel pump, verified voltage at pump. So im checking ignition side and i find wrong coil in car, have substitute to try tomorrow, verified voltage to coil, If i have a tach signal are my rpm and refrerence signals ok? whats easy way to chk without a scope?
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1980 930 Turbo 1993 Corrado 1983 944 1984 944 2001 VW golf TDI |
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02-10-2015, 06:17 PM
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Registered
Join Date: May 2014
Posts: 298
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Quote:
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02-10-2015, 07:24 PM
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Registered
Join Date: Feb 2009
Location: Park Hills, KY
Posts: 2,459
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if your TACH bounces when turning the engine over, that is a good sign the sensors are OK. but not sure it is a guarantee. my impression is the tach bouncing is a good sign the speed reference sensor is working. not sure if it also represents a good crank sensor too.
I got a non-running 951 project and replaced both because I did not see this. still no tach bounce, so borrowed an O scope to verify signals at the DME. turns out there is something bad with the dash wiring to my tach. so bad fuel pump and questionable coil? sounds like the 944S project I did before doing the 951 now. good luck and have fun.
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Bob Cox 78 930 clone project car. 87 924S resurrect at some point. 84 928S, Ruby Red linen/brown interior - sold  86 944 turbo my new DE/track car - sold
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02-11-2015, 07:46 AM
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