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Ruby911
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RPMs drop when I turn headlights on - is this normal?
The title pretty much says it...The RPMs drop about 200 when I turn on the headlights. Is it supposed to? I dont recall that it used to do that. Any ideas on the fix, assuming it is bad?
Thanks, Farrell
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1984 Carrera - SW Chip, Factory Short Shift Kit, Cat Bypass - SOLD 1968 Ossi Blue 912 Sunroof Coupe - SOLD 1971 911E - 2.7 Twin Plugged, PMOs - SOLD 1965 356C Outlaw RGruppe #577 |
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10-05-2009, 10:26 AM
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Mine dip about 100 or so then recover immediately. It's from the additional current that instantaneously loaded the electrical system...
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88' Carrera, Black/Black/Black, "Murdered Out" OEM. 06' BMW 'M' Roadster (Wife's car and WAY faster than mine) |
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10-05-2009, 11:28 AM
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Registered
Join Date: Oct 2005
Location: Capistrano Beach, Ca.
Posts: 7,235
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Doesn't sound normal to me. It it a true RPM drop or is just the tach reading dropping?
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L.J. Recovering Porsche-holic Gave up trying to stay clean Stabilized on a Pelican I.V. drip |
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10-05-2009, 11:36 AM
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Ruby911
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The tach drops and the idle changes - almost like when I turn the AC on.
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1984 Carrera - SW Chip, Factory Short Shift Kit, Cat Bypass - SOLD 1968 Ossi Blue 912 Sunroof Coupe - SOLD 1971 911E - 2.7 Twin Plugged, PMOs - SOLD 1965 356C Outlaw RGruppe #577 |
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10-05-2009, 11:45 AM
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muck-raker
Join Date: Jan 2009
Location: Coastal PNW
Posts: 3,059
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definitely not normal. Possible VR or alternator issue.
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STONE '88 Cabriolet, using EP Slick 20w50 partial synthetic Snake Oil...just as Rommel intended.  Deny Everything; Admit Nothing; and Always Make Counter-accusations 
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10-05-2009, 03:12 PM
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check your ground , especially the battery to body , and the tranny to engine/body
if either are bad your electrical system is in trouble , and this may be its way of screaming for help ...
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10-05-2009, 03:45 PM
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1984 Porsche 911 3.2
Bonnie Blue
Bloodymary
1988 Porsche 911 Carrera
2006 BMW 'M Roadster'
Willie
