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04-24-2017 | #1 |
Join Date: Jul 2016
Location: Bloomington, MN
Posts: 127
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Intermittent DNS
So I now have the intermittent DNS (dreaded no start) on my 91 Z. I want to try to bypass the clutch safety switch to see if that helps. Can I just unplug it and jumper across the plug or is there more to it?
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1991 ZR-1 #520 Arctic White/Gray |
04-24-2017 | #2 |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,162
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Re: Intermittent DNS
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
04-24-2017 | #3 |
Join Date: May 2007
Location: Westminster, Maryland
Posts: 3,689
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Re: Intermittent DNS
Verify that both battery terminals are clean and tight. Disconnect any after market systems attached to the battery terminals.
Put the ignition key to ON, Engine not started. Note the battery voltage on the instrument panel. Turn the key to start, while watching the battery voltage meter. If the needle does not deflect, then investigate the starting circuit, ie clutch switch, VATS, TDS. If the volt meter does deflect, it means that the starter solenoid is energizing but the solenoid contacts are not passing current to the starter motor. Rebuild the starter solenoid or replace the starter. NOTE, keep this procedure handy because it has to be done when the car won't crank. For an intermittent problem like you stated, you will have to wait until the next failure. Good luck, Jim
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If it isn't fun, you aren't doing it right! 1990 Black ZR-1 - sold 1993 Quasar Blue ZR-1 1994 Competition Yellow ZR-1 1995 Dark Purple ZR-1 Maryland State Coordinator WAZOO Member Last edited by QB93Z; 04-24-2017 at 06:32 PM. |
04-24-2017 | #4 | |
Join Date: Jul 2016
Location: Bloomington, MN
Posts: 127
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Re: Intermittent DNS
Quote:
Sent from my XT1080 using ZR-1 Net Registry mobile app
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1991 ZR-1 #520 Arctic White/Gray |
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04-25-2017 | #5 |
Join Date: Aug 2005
Location: Iuka, Mississippi 38852
Posts: 756
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Re: Intermittent DNS
EXACTLY the same symptoms I had when the starter solenoid contacts were dirty.
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05-10-2017 | #6 |
Join Date: Jul 2016
Location: Bloomington, MN
Posts: 127
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Re: Intermittent DNS
OK, so it happened again. I watched the volt meter and the needle didn't move when I turned the key to start. I was able to get a push start. What's the next step?
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1991 ZR-1 #520 Arctic White/Gray Last edited by ALLTHECAMS; 05-10-2017 at 10:48 PM. |
05-11-2017 | #7 |
Join Date: May 2007
Location: Westminster, Maryland
Posts: 3,689
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Re: Intermittent DNS
TDS is the theft deterrent system, the resistance chip in the ignition key that is checked to allow the computer to allow the starter circuit to energize.
The next step is to rebuild the starter solenoid or replace the starter. Jim |
05-11-2017 | #8 | |
Join Date: Jul 2016
Location: Bloomington, MN
Posts: 127
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Re: Intermittent DNS
Quote:
Sent from my XT1080 using ZR-1 Net Registry mobile app
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1991 ZR-1 #520 Arctic White/Gray |
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05-11-2017 | #9 | |
Join Date: May 2007
Location: Westminster, Maryland
Posts: 3,689
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Re: Intermittent DNS
Quote:
You are correct. I am on the road in Colorado right now and wasn't following you comments carefully enough. I suggest troubleshooting the starter circuit to identify a switch or wiring that is failing. I don't have any manuals with me so I will leave the explanation to others. Jim |
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05-11-2017 | #10 |
Join Date: Dec 2007
Location: Fremont,Ca
Posts: 3,072
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Re: Intermittent DNS
Bypassing the switch is easy. Pull the hush panel and look up under the dash and look for the 10 gauge PURPLE WIRE plug,it should be towards left of the steering column. I have a jumper I made,if you were closer I'd loan it to you for some trouble shooting.
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