no spark

1994 NISSAN TRUCK
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KEN LAFOND
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about 2 months ago i had a failure to start after brief stop. I tapped on coil and it started and did this 3 times. new coil has been fine for 4 wks, then again it does this, tap coil starts, coil tests well as does the IC unit .I'm a former electronic tech and a decent mechanic, all wiring and voltages are fine and clean, my haynes manual is a little confusing . do i next go through the ecu flashes routine. i'm praying its not in that as i am broke, thank you ken and a donation will be on its way in short order if you can help me out thanks again.
May 2, 2008 at 8:55 PM
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RASMATAZ
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  • 75,992 POSTS
Check for battery voltage at black and white wire at coil and the blue wire at the power transistor. Also test the crankshaft position sensor see below


https://www.2carpros.com/forum/automotive_pictures/12900_cps1_3.jpg


https://www.2carpros.com/forum/automotive_pictures/12900_cps2_2.jpg


https://www.2carpros.com/forum/automotive_pictures/12900_cps3_1.jpg

May 3, 2008 at 4:03 AM
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CANBREE
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I have a 1994 Nissan King cab that is not getting fire to the coils no spark. It cranks but that is it. what could be wrong
Aug 26, 2019 at 7:04 PM (Merged)
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RASMATAZ
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  • 75,992 POSTS
No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs,coil's resistances,distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it.
Aug 26, 2019 at 7:04 PM (Merged)