 Weak spark with Bosch Blue Coil, car won't start...then starts and sounds great...then no start.. |
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| second wind |
 Jan 3 2018, 04:43 PM
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#1
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Senior Member  Group: Members Posts: 855 Joined: 30-December 10 From: Los Angeles, California Member No.: 12,543 Region Association: Southern California 
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Hello gang and Happy New Year to all. My car hasn't run in weeks and I am closing in on the problem. With plugs out and cranking the spark in the spark plugs is very faint. I have a new Bosch Blue Coil to put in but wondered if anyone knows of a static test I can perform on my replacement coil (not brand new but told it came off a running car) and my old coil to compare results? Time to get back on the road. Thank you very much.
gg |
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| Rand |
Jan 3 2018, 04:46 PM
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#2
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
Check the braided ground wire between the advance plates in the distributor. If it's not solidly connected at both ends, you get weak spark. It's not unusual for one end to break loose where it's soldered. May not be your answer, but it's an answer you need to know either way
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| BK911 |
Jan 4 2018, 08:49 AM
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#3
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Senior Member Group: Members Posts: 672 Joined: 19-February 04 From: Rocky Top, TN Member No.: 1,674 Region Association: None |
Check continuity between the terminals.
Haynes describes the procedure and acceptable values. |
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| jcd914 |
Jan 4 2018, 09:36 AM
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#4
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Advanced Member Group: Members Posts: 2,081 Joined: 7-February 08 From: Sacramento, CA Member No.: 8,684 Region Association: Northern California |
A generic testing procedure, I'm not sure of the specs for a Bosch blue coil.
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| mgphoto |
Jan 4 2018, 09:59 AM
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#5
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"If there is a mistake it will find me" Group: Members Posts: 1,339 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California |
Start with the battery, fully charged should measure from terminal to terminal (not clamp to clamp) 12.8 - 12.6 v if not change it to capacity.
Resistance is the next problem, that's why we measure from the terminals. Corrosion between connectors is the main issue with a 40+ year old car. Starter will operate at a voltage of 9.5 v, FI might but ignition will have a tough time, especially if the ignition wires have some corrosion. Multi-meter is your best weapon. |
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| IronHillRestorations |
Jan 4 2018, 08:11 PM
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#6
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I. I. R. C. Group: Members Posts: 6,719 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None
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Can also be the points and/or condenser
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