Crank / No Spark problem
1st Gear
Joined: Jul 2020
Posts: 1
Likes: 0
90 c4 vette
. I have a no spark issue. I replaced the cap, rotor, ignition coil, fixed loose wires on the coil, pick up coil, also put a new ground strap on it. It fired up about 5 times but not consecutively. Now after replace the pick up coil 0 spark. I'm stumped and scan tool only starts at 95. I'm lost here and looking for someone smarter than me to help.
. I have a no spark issue. I replaced the cap, rotor, ignition coil, fixed loose wires on the coil, pick up coil, also put a new ground strap on it. It fired up about 5 times but not consecutively. Now after replace the pick up coil 0 spark. I'm stumped and scan tool only starts at 95. I'm lost here and looking for someone smarter than me to help.
Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
90 c4 vette
. I have a no spark issue. I replaced the cap, rotor, ignition coil, fixed loose wires on the coil, pick up coil, also put a new ground strap on it. It fired up about 5 times but not consecutively. Now after replace the pick up coil 0 spark. I'm stumped and scan tool only starts at 95. I'm lost here and looking for someone smarter than me to help.
. I have a no spark issue. I replaced the cap, rotor, ignition coil, fixed loose wires on the coil, pick up coil, also put a new ground strap on it. It fired up about 5 times but not consecutively. Now after replace the pick up coil 0 spark. I'm stumped and scan tool only starts at 95. I'm lost here and looking for someone smarter than me to help.
From your post, the engine cranks but won't start. Are you sure lack of spark is the issue? First step should be to confirm no spark on at least one plug. If you don't have a high-voltage test light, ground a spare spark plug with the plug wire connected and crank the engine to test, do that on a couple of plug wires. A spark there then boils down to a timing or lack of fuel issue. If no spark, bearing in mind that these cars are old enough to vote and then some, you should check each element of the ignition circuit with a 12 volt test probe. Test to see if there is power to the low-voltage side of the coil with the ignition key in "crank" position. If yes, with the test light still connected, have a helper wiggle the key in the ignition switch to see if there is an intermittent short in the wiring upstream from the coil. If yes, follow the electrical path from the coil to the distributor using the high-volt tester. The goal is to isolate the faulty element in the circuit.
Last edited by sailorsteve; Jul 28, 2020 at 02:48 PM.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,713
Likes: 4,107
From: Cape Coral, Florida
90 c4 vette
. I have a no spark issue. I replaced the cap, rotor, ignition coil, fixed loose wires on the coil, pick up coil, also put a new ground strap on it. It fired up about 5 times but not consecutively. Now after replace the pick up coil 0 spark. I'm stumped and scan tool only starts at 95. I'm lost here and looking for someone smarter than me to help.
. I have a no spark issue. I replaced the cap, rotor, ignition coil, fixed loose wires on the coil, pick up coil, also put a new ground strap on it. It fired up about 5 times but not consecutively. Now after replace the pick up coil 0 spark. I'm stumped and scan tool only starts at 95. I'm lost here and looking for someone smarter than me to help.
