Mechanics

90 300ZX NO SPARK

1990 All Other Makes All Other Models

I have a 90 300ZX with 57k miles and it wont spark! New crank sensor, new computer, any other ideas?
Avatar
SRPGA2B
April 24, 2007.



Look for spark at the coil wire disconnect it from the D/Cap do you have spark? Got spark there change the rotor and the cap it has to go thru there to get to the plugs, could also be the coil, no power to it wire problem or a blown ignition fuse/main relay

Rasmataz
Apr 25, 2007.
Look for spark at the coil wire disconnect it from the D/Cap do you have spark? Got spark there change the rotor and the cap it has to go thru there to get to the plugs, could also be the coil, no power to it wire problem or a blown ignition fuse/main relay[/quote: 7887b06e30]
there is no distributor, it has independent coils, I have checked the relays and fuses, any other help?

Tiny
SRPGA2B
Apr 25, 2007.
Look for spark at the coil wire disconnect it from the D/Cap do you have spark? Got spark there change the rotor and the cap it has to go thru there to get to the plugs, could also be the coil, no power to it wire problem or a blown ignition fuse/main relay[/quote: 67d0d94566]
there is no distributor, it has independent coils, I have checked the relays and fuses, any other help?[/Quote: 67d0d94566]

COP coil in plugs-check for power at each coil-and check every plug wire for spark-there's a way on checking it-the coil sits right on top of the sparkplug fabricate a sparkplug wire as a jumper to ground.

When all ignition components checks out good-the last item to check is the computer

In a typical COP ignition system, a crankshaft position sensor generates a basic timing signal by reading notches on the crankshaft, flywheel or harmonic balancer. The crank sensor signal goes to the powertrain control module (PCM), where it is used to determine firing order and turn the individual ignition coils on and off.

A COP engine that cranks but fails to start, in many cases, will often have a problem in the crankshaft position sensor circuit

I hope this helps-Good Luck

Rasmataz
Apr 26, 2007.