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Canucks Fan
 
Join Date: Jan 2009
Location: Vancouver B.C. Canada
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Question Wierd acting 87

Hi Guys
My 87 930 starts great and after a short warm up, I take it out, after about 2 miles it starts to run ruf, like its alternating between 4 and 5 cyl, the tach also bounces and goes to about 5000 when its barley at idle, seems like it wants to stall, I limp home and scratch my head.
The head scratching I can deal with, anyone have any ideas where to look for my problem, battery has full charge and the alt is putting out according to a test that I preformed from some other advice I got here.
Finn

Old 10-17-2010, 03:46 AM
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The symptoms you describe are often seen with a CD box failure, a coil failure, or problems with the wiring between the two.
Old 10-17-2010, 06:05 AM
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Also, check the output of your alternator/battery. Minimum of 13.5 VDC when engine is running.
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Old 10-17-2010, 06:58 AM
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I agree with Werk-alternator/battery.
Old 10-17-2010, 07:24 AM
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Quote:
Originally Posted by roger's 2937 View Post
I agree with Werk-alternator/battery.
+2. This rears it's ugly head periodically on the forum. Bouncing tach and poor running usually point to alternator/voltage regulation issues....and/or poor grounds.
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Old 10-17-2010, 08:20 AM
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i agree with all above, sounds like it could be a cd box and or coil failure, also sounds more like an overcharging issue then a weak battery. check the battery with car running if you rev it and it goes past 16volts you have a bad voltage regulator
Old 10-17-2010, 07:21 PM
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That is a good point. Overcharging would also cause this problem and still leave the battery charged.
Old 10-18-2010, 09:48 AM
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had it happen

Over charging,smell the battery?? mine was the regulator tach bouncing etc

Old 10-19-2010, 01:33 PM
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