Cranking Engine for Compression Test
Thread Starter
Instructor
Joined: Oct 2006
Posts: 246
Likes: 1
From: Elk Plain WA
St. Jude Donor '11
Cranking Engine for Compression Test
Will any harm come to my 86 Vette if I jump the solenoid with a remote starter button tool to crank the engine. I want to operate as I'm used to on other cars. I work alone. I've never had an HEI ignition before so I'm being careful to not damage anything. The distributer cap and coil are removed at this time.
Anyone ....chime in ...need to know before I can procede.
Anyone ....chime in ...need to know before I can procede.
Race Director
Joined: Dec 2002
Posts: 13,345
Likes: 230
From: SCMR Rat Pack'r Charter Member..Great Bend KS
If the coil is removed, and you've disconnected all wires to the dist, and the ignition is OFF....You shouldn't have any problems.
You are right to ask though, some ignitions systems can be damaged if you don't have a way for the spark to get to ground and you crank the engine.
Larry
code5coupe
You are right to ask though, some ignitions systems can be damaged if you don't have a way for the spark to get to ground and you crank the engine.
Larry
code5coupe
Racer
Joined: Sep 2005
Posts: 271
Likes: 0
From: New Freedom PA
remote cranking
Will any harm come to my 86 Vette if I jump the solenoid with a remote starter button tool to crank the engine. I want to operate as I'm used to on other cars. I work alone. I've never had an HEI ignition before so I'm being careful to not damage anything. The distributer cap and coil are removed at this time.
Anyone ....chime in ...need to know before I can procede.
Anyone ....chime in ...need to know before I can procede.
Desert
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Wire the throttle open 100% and unplug the pink wire from the distributor cap.
The computer should not fire the injectors during cranking if the throttle is wired wide open, but as a precaution you can disconnect the fuel pump fuse or injector fuses anyways.
Pull all plugs, and hook up your gage, you should be able to put it where you can see it from inside the car, and just crank with the key.
The computer should not fire the injectors during cranking if the throttle is wired wide open, but as a precaution you can disconnect the fuel pump fuse or injector fuses anyways.
Pull all plugs, and hook up your gage, you should be able to put it where you can see it from inside the car, and just crank with the key.
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
If the coil is removed, and you've disconnected all wires to the dist, and the ignition is OFF....You shouldn't have any problems.
You are right to ask though, some ignitions systems can be damaged if you don't have a way for the spark to get to ground and you crank the engine.
Larry
code5coupe
You are right to ask though, some ignitions systems can be damaged if you don't have a way for the spark to get to ground and you crank the engine.
Larry
code5coupe
Burning Brakes
Joined: Dec 2003
Posts: 1,183
Likes: 1
From: MidOhio
'89 FSM says: disconnect BAT lead and the 4-terminal connector to the HEI, remove ECM fuse, throttle open 100%, all plugs out and battery at or near full charge. Be careful with the locking tabs on the connectors: they're old, they're brittle, they break!
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