no spark HEI
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Joined: May 2016
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no spark HEI
I put an HEI system from a '75 Cutlass in my '72 Cutlass. The system worked in the '75 but I am getting no spark in the '72. The rotor, cap, coil, ICM, plugs and wires are new. There is power getting to the coil. My mechanic ran a temporary 10 gauge wire from the battery to distributor(because the dash is out) This should provide full 12 volt power. (?) I am getting no spark. Any input would be great.
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Joined: Oct 2009
Posts: 42,506
From: Poteau, Ok
Like I said in the PM I responded to, the problem is in your HEI. You need to sheck the individual components.
1. Connect an ohmmeter between the TACH and BAT terminals in the distributor cap (at the coil on the L4). The primary coil resistance should be less than one ohm.
2. To check the coil secondary resistance, connect an ohmmeter between the rotor button and the BAT terminal. Note the reading. Connect the ohmmeter between the rotor button and the TACH terminal. Note the reading. The resistance in both cases should be between 6,000 and 30,000 ohms. Be sure to test between the rotor button and both the BAT and TACH terminals.
3. Replace the coil only if the readings in Step 1 and Step 2 are infinite.
These resistance checks will not disclose shorted coil windings. This condition can only be detected with scope analysis or a suitably designed coil tester. If these instruments are unavailable, replace the coil with a known good coil as a final coil test.
4. To test the pick-up coil, first disconnect the white and green module leads. Set the ohmmeter on the high scale and connect it between a ground and either the white or green lead. Any resistance measurement less than infinity requires replacement of the pick-up coil.
5. Pick-up coil continuity is tested by connecting the ohmmeter (on low range) between the white and green leads. Normal resistance is between 650 and 850 ohms. Move the vacuum advance arm while performing this test. This will detect any break in coil continuity. Such a condition can cause intermittent misfiring. Replace the pick-up coil if the reading is outside the specified limits.
6. If no defects have been found at this time, and you still have a problem, then the module will have to be checked. If you do not have access to a module tester, the only possible alternative is a substitution test. If the module fails the substitution test, replace it.
More info:
http://www.angelfire.com/realm2/84ca...coil/coil2.htm
1. Connect an ohmmeter between the TACH and BAT terminals in the distributor cap (at the coil on the L4). The primary coil resistance should be less than one ohm.
2. To check the coil secondary resistance, connect an ohmmeter between the rotor button and the BAT terminal. Note the reading. Connect the ohmmeter between the rotor button and the TACH terminal. Note the reading. The resistance in both cases should be between 6,000 and 30,000 ohms. Be sure to test between the rotor button and both the BAT and TACH terminals.
3. Replace the coil only if the readings in Step 1 and Step 2 are infinite.
These resistance checks will not disclose shorted coil windings. This condition can only be detected with scope analysis or a suitably designed coil tester. If these instruments are unavailable, replace the coil with a known good coil as a final coil test.
4. To test the pick-up coil, first disconnect the white and green module leads. Set the ohmmeter on the high scale and connect it between a ground and either the white or green lead. Any resistance measurement less than infinity requires replacement of the pick-up coil.
5. Pick-up coil continuity is tested by connecting the ohmmeter (on low range) between the white and green leads. Normal resistance is between 650 and 850 ohms. Move the vacuum advance arm while performing this test. This will detect any break in coil continuity. Such a condition can cause intermittent misfiring. Replace the pick-up coil if the reading is outside the specified limits.
6. If no defects have been found at this time, and you still have a problem, then the module will have to be checked. If you do not have access to a module tester, the only possible alternative is a substitution test. If the module fails the substitution test, replace it.
More info:
http://www.angelfire.com/realm2/84ca...coil/coil2.htm
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