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05-11-2017
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#1 |
 
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,133
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Re: Intermittent DNS
If it is Hot start only, it is the contacts of the solenoid. I chnaged the wiring a bit to minimize the solenoid electrical path, I still ended up pulling the starter and replacing the contacts.. The Challenge is diagnosing while hot..
But because it is only when hot, the contacts make more sense than the clutch switch
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - 3" Magnaflow Bullet cats - LT4 Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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05-11-2017
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#2 | |
 
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
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#3 |
  
Join Date: Jun 2005
Location: pittsburgh
Posts: 4,633
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Re: Intermittent DNS
If you need a how to on bypassing the clutch switch I can post it when I get home from work tonight.
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It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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07-16-2017
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#4 |
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Join Date: Jul 2016
Location: Bloomington, MN
Posts: 127
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Re: Intermittent DNS
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1991 ZR-1 #520 Arctic White/Gray |
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07-16-2017
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#5 |
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: Intermittent DNS
Pull a spark plug wire then crank it with a plug checker or just a screwdriver to ground and see it you have spark. If no spark I'll bet it's a VATS issue.
Sent from my iPhone using ZR-1 Net Registry
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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07-16-2017
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#6 |
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Join Date: Dec 2007
Location: Fremont,Ca
Posts: 3,039
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Re: Intermittent DNS
One other option is to put a secondary relay in for the starter,check out sticky thread in the ZR-1 second on the other site.
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07-16-2017
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#7 |
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Join Date: Jul 2016
Location: Bloomington, MN
Posts: 127
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Re: Intermittent DNS
I have spark. 45-50 psi fuel pressure. It actually started when I was working on it today. I test drove and started it 3 more times once I got home. I put the dash back together and it wouldn't start again.
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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07-17-2017
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#8 |
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Join Date: Jun 2013
Location: Toronto
Posts: 782
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Re: Intermittent DNS
I did not go back and read the rest but is vats still active ? Have you tried both keys if you have them? When my clutch switch went I went ahead and added the resistor to by pass the pellet on the key
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07-17-2017
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#9 | |
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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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09-29-2017
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#10 |
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Join Date: Jun 2008
Location: Alberta
Posts: 87
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Re: Intermittent DNS
Where is VATS lockout located ? Is it possible to completely eliminate the entire VATS and TDS ?
I have been fighting DNS for 2 years now, on 2 1990 cars. New batteries, both new fuel pumps, bypassing VATS at bottom of steering column, TPS has .45 volts. On my red car, key on, under hood use jumper from battery to the larger purple wire to engage starter, ....car cranks and car fires and tries to run for 3 seconds then dies. Subsequent tries car will not fire, unless turn key off and wait 10 minutes, then it will fire once only, then key off and wait again. My vacuum pump not working. Car has spark on all 8. Please, any help ideas ? Sent from my iPhone using ZR-1 Net Registry
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