and for it not cranking it could be a low battery or bad connection.
1984 corvette
Thread Starter
Heel & Toe
Joined: May 2016
Posts: 18
Likes: 0
1984 corvette
I recently bought a1984 corvette with a manual transmission that's been setting up for about two years and was running when it was parked when we went to pick the car up the clutch petal would not move so I pushed really hard and it went down but now there's no petal pressure at all I looked at the clutch petal rod on the master cylinder under the dash and its moving in and out. The slave cylinder on the transmission is not moving at all so would it be safe to say the master cylinder is probably the problem. Second question all so i cant get the car to spin over all the dashboard lights up but will not turn over at all thought it might be the neutral safety switch on the petal but it seems to be in working order also jumped the switch with a jumper wire but still nothing is there something else I should try and I'm was wondering if the bad master cylinder could have something to do with it not turning over any help would be greatly appreciated thanks
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Clutch, you probably blew the hose or a fitting; I'd bet you blew the fitting where the hose attaches to the MC.
Question is "why"? It's dead-headed and you need to figure out what the reason for THAT is. My guess is that the slave (if cast iron) is stuck, but only way to diagnose this is get under the car, play w/the clutch fork w/a pry bar and see what will move and what won't.
As for the starter not cranking the engine, start at one end of the circuit, checking for power, and work your way through the circuit until you find the problem. Here is the diagram for it (top left one);
Question is "why"? It's dead-headed and you need to figure out what the reason for THAT is. My guess is that the slave (if cast iron) is stuck, but only way to diagnose this is get under the car, play w/the clutch fork w/a pry bar and see what will move and what won't.
As for the starter not cranking the engine, start at one end of the circuit, checking for power, and work your way through the circuit until you find the problem. Here is the diagram for it (top left one);
Burning Brakes
Joined: Apr 2016
Posts: 781
Likes: 73
The no crank situation may be related to your clutch issue and the clutch switch.
I'm not been able to find a lot of info on how it is supposed to work. I do know that if I shut mine off then try to restart it without first releasing the clutch then depressing the clutch again I get a no crank situation.
Hopefully someone can teach us how it is supposed to function.
I'm not been able to find a lot of info on how it is supposed to work. I do know that if I shut mine off then try to restart it without first releasing the clutch then depressing the clutch again I get a no crank situation.
Hopefully someone can teach us how it is supposed to function.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Some one already did. See the diagram (the top, left one) in post #2. It is a simple, on/off switch. It closes a circuit (pedal depressed) or opens it (pedal released). If you have to stroke your pedal to re-start the car, something is wrong with the switch, the way it's physically actuated...or there is an unrelated issue that you are correlating to your clutch switch.
Burning Brakes
Joined: Apr 2016
Posts: 781
Likes: 73
Some one already did. See the diagram (the top, left one) in post #2. It is a simple, on/off switch. It closes a circuit (pedal depressed) or opens it (pedal released). If you have to stroke your pedal to re-start the car, something is wrong with the switch, the way it's physically actuated...or there is an unrelated issue that you are correlating to your clutch switch.
To be honest it would be rare that I would immediately want to restart the car without having released the clutch pedal.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
True. It would be interesting to "get into" that issue and see what the deal is. Strange one.
EDIT: It IS providing power the the TD module...so maybe you're right that the TD module is influencing it? Although shutting the car off, should cut power to the TD module in the same way that releasing the clutch pedal would too, so....interesting one.
EDIT: It IS providing power the the TD module...so maybe you're right that the TD module is influencing it? Although shutting the car off, should cut power to the TD module in the same way that releasing the clutch pedal would too, so....interesting one.
Last edited by Tom400CFI; May 7, 2016 at 12:08 PM.
Melting Slicks
Joined: May 2014
Posts: 2,894
Likes: 592
From: New Port Richey FL
.
Cutting thru a lot of things First the clutch rod not moving that lies somewhere in the Hydraulics and clutch system, and all will agree on that.
Second if the Battery and connections are good as well as it's charge, I would get under the car with a test light find the starter Solenoid and test if your getting the command to crank, if NO command or no light or command. Run with the input schematics gathered above and go chasing. if you have the command get a hammer and give the starter a Whack with someone turning the key and see if it cranks.
Safety Note remember Your Clutch Pedal Doesn't Disengage your transmission so if your car is in gear IT WILL MOVE !!!!!! WHEN CRANKED
True. It would be interesting to "get into" that issue and see what the deal is. Strange one.
EDIT: It IS providing power the the TD module...so maybe you're right that the TD module is influencing it? Although shutting the car off, should cut power to the TD module in the same way that releasing the clutch pedal would too, so....interesting one.
EDIT: It IS providing power the the TD module...so maybe you're right that the TD module is influencing it? Although shutting the car off, should cut power to the TD module in the same way that releasing the clutch pedal would too, so....interesting one.
Second if the Battery and connections are good as well as it's charge, I would get under the car with a test light find the starter Solenoid and test if your getting the command to crank, if NO command or no light or command. Run with the input schematics gathered above and go chasing. if you have the command get a hammer and give the starter a Whack with someone turning the key and see if it cranks.
Safety Note remember Your Clutch Pedal Doesn't Disengage your transmission so if your car is in gear IT WILL MOVE !!!!!! WHEN CRANKED
Last edited by s carter; May 7, 2016 at 02:41 PM.
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