05-22-2019 | #11 | |
Join Date: Jan 2012
Location: Wisconsin
Posts: 887
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Re: Classic no start “relay fix” – what does it do?
Thanks everyone
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When "no start" happens, there's no solenoid click. I turn the key and nothing. When it does happen, I usually haven't been able to measure voltage. The last time it happened was at home, I got my meter and was ready to measure, but when I turned the key, it started up. Connections are clean and tight.
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1990 ZR-1 #2180 Red/Black Many of the usual mods for 460HP, tuned by Marc Haibeck ZR-1 Net Registry Member #1548 |
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05-23-2019 | #12 |
Join Date: Feb 2011
Location: Clayton, North Carolina
Posts: 1,133
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Re: Classic no start “relay fix” – what does it do?
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Lou[COLOR="Red"][B][SIZE="4"][/SIZE][/B][/COLOR] |
05-24-2019 | #13 |
Join Date: Oct 2004
Location: Folsom CA
Posts: 1,653
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Re: Classic no start “relay fix” – what does it do?
Be forewarned, push starting a ZR1 by yourself can be unhealthy.
One of our former members got his leg caught in the back wheel when trying to hop back into the car. I'll have to go digging for the posting, it was quite graphic. 'Crabs
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TomC '90ZR1 #792 Honorary Pirate [B]If it ain't FUN, you're doing something terribly WRONG. [/B] |
05-31-2019 | #14 | |
Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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Re: Classic no start “relay fix” – what does it do?
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In the 90-92 schematic there is a START RELAY which is commanded by the CCM. That relay sends power to the clutch safety switch (which you say is bypassed). That being the case, you'd like to know if the purple wire leading to the starter solenoid was reading ~ 12 volts when you turn the switch. IF NOT, then start tracing the circuit and find out where you are loosing voltage when the ignition switch is turned to START. The schematic says it all. And, Marc has listed the normal voltages at the various locations along circuit. Get some test leads w/ alligator clips on each end soze you can connect your VOM and place it were you can see it when you turn the START switch. (NOTE: If the START switch were not working, THAT TOO would cause the problem. My point is, the solution requires that the circuit be tested along the path until voltage with the start switch ON dissappears. Then find out WHY before changing anything. (RULE OF THUMB: A device isn't bad until it has "gozeinto but no gozeouta" ) Have no fear. this little ditty can be found. It is a bit unusual - not the usual culprit in the dreaded NO START ISSUE. But, NO POWER problems are usually pretty straight forward. Start with measuring voltage on the purple wire leading to the solenoid. With the ignition switch in the START position, do you have ~12 volts. If not, then divide the circuit in half and test again. (NOTE: With the clutch switch bypassed, there is only the START RELAY, (assuming connections are not corroded: but, you checked that, right? RIGHT??) The relay (black-yellow wire) is connected to the CCM and when the IGN switch is in START, the voltage at that wire should go to zero, or very close to it [indicating the CCM has grounded the START RELAY coil as it should when starting the car]. And, as always, CONNECTIONS, CONNECTIONS, CONNECTIONS....!!)
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry |
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06-04-2019 | #15 | |
Join Date: Jan 2012
Location: Wisconsin
Posts: 887
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Re: Classic no start “relay fix” – what does it do?
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You're right Paul. Bypassing the Start Relay has the added benefit of disabling the VATS system also. Every time I tried to "catch" the no-start issue, the engine decided to start so I couldn't get readings when it didn't start. I bypassed the Start Relay and so far I haven't experienced a no-start condition. Gary
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1990 ZR-1 #2180 Red/Black Many of the usual mods for 460HP, tuned by Marc Haibeck ZR-1 Net Registry Member #1548 |
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06-05-2019 | #16 | |
Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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Re: Classic no start “relay fix” – what does it do?
Quote:
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry |
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06-05-2019 | #17 |
Join Date: Dec 2007
Location: Fremont,Ca
Posts: 3,073
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Re: Classic no start “relay fix” – what does it do?
It was recently brought to my attention I may have gottin the wiring wrong on my installation so that might need to be verified before anybody does this modification yet I have had not a single -no start- issue in the 4 years since I did it.
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06-05-2019 | #18 | |
Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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Re: Classic no start “relay fix” – what does it do?
Quote:
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry |
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06-05-2019 | #19 | |
Join Date: Oct 2004
Posts: 1,890
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Re: Classic no start “relay fix” – what does it do?
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Have you actually confirmed that yours is wired as you mentioned and it's NOT just typo in your thread? |
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06-05-2019 | #20 | |
Join Date: Oct 2004
Posts: 1,890
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Re: Classic no start “relay fix” – what does it do?
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https://www.corvetteforum.com/forums...made-easy.html Last edited by WVZR-1; 06-05-2019 at 01:44 PM. |
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