Tach doesn't always pulse - Saab 9000 Bulletin Board - Saabnet.com
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Tach doesn't always pulse
Posted by Wingerr (more from Wingerr) on Fri, 20 Jan 2006 20:05:05
In Reply to: Re: Might have been easier to try the DI first-, Rudolph, Fri, 20 Jan 2006 17:22:58
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It may be an indication that it's good, but may not necessarily tell you if it's bad, because some systems with working CPS's won't show a noticeable movement while cranking.
I'd use the "jumper from the fuel pump output at the fuse block to hazard light relay circuit" method as a quick preliminary check; if the CPS isn't putting out, the system won't engage the fuel pump relay. No tools needed and no straining to hear the fuel pump whine, which makes it fairly easy; just need a scrap of wire-
posted by 68.237.6...
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