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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


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Old 08-31-2014, 12:10 AM   #1
tdk3231
 
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Cranking but no spark

So recently took my car to the car wash. Washed it and once I was done the car would crank but wouldn't start. Figured I got something wet since I have hood spacers. Let the car sit for about 20 minutes and it started up. Drove it about 2 miles and died on me but all the acc still work.

My set-up
-Ka24DE-T
-Supertech 0.020" over 8.6:1 Forged pistons
-Eagle H-beam rods
-Crower 264/264 cams
-ARP Head bolts
-Cosworth Headgasket
-Engine work - block/head cleaned & pressure
tested, new freeze plugs, cylinder boring/honing
-MAZWORX turbo kit w/ 4" intake
-AMS fuel kit w/ 76 lb./hr. injectors
-Walbro 255 fuel pump
-Custom Magnecore 8.5mm wires
-MegaSquirt 2 ECU/wiring harness
-(4) custom LS2 coil packs

I'm not getting any spark from any of the coil packs. Checked all the grounds found 1 bad ground and fixed it but still no spark. We're all here scratching our heads. Hopefully someone has a possible solution. Thanks in advance.
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Old 08-31-2014, 12:12 AM   #2
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Possible short elsewhere in the system. Is the ECU located inside the car? Anywhere else that water would have been able to get in and damage components? Missing firewall grommets etc.
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Old 08-31-2014, 12:15 AM   #3
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The ECU is located inside the car. There's a hole in the firewall but it where everything runnings to the ECU but it would of had to enter at the perfect angle.. Which is a possibility but that wouldn't make sense for the car to have started again and then ran for a few miles then shut off.
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Old 08-31-2014, 12:28 AM   #4
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Check the main fuses in the engine bay on the passenger side near the battery cables. Maybe the Engine Control fuse etc.

I would do a continuity test on them because i literally had one blow on the side where you could not see it. The window on the top does not always help.

These ones.

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Old 08-31-2014, 12:30 AM   #5
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Will do. I'll post an update once I can.
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Old 08-31-2014, 12:41 AM   #6
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Ignore the finger in that picture pointing to the relays haha.

Make sure to check the 25 Amp fuses.
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Old 09-01-2014, 07:16 AM   #7
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Replaced the fuses. Still no spark
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Old 09-02-2014, 03:11 AM   #8
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Think it might be the CAS?
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Old 09-02-2014, 12:21 PM   #9
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Do you have power to the coils? Is the fuel pump priming?
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Old 09-02-2014, 05:53 PM   #10
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The fuel pump is priming. pretty sure the coils do too.
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Old 09-02-2014, 07:05 PM   #11
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i am having the same problem. i can only get it started with starter fluid
after it starts car drive fine.

have you check
ignition coil
ignitor
wires
spark plugs/wires
distirbutor -- bad crank angle sensor
fuel fuse
fuel pump
Egi
Egi relay
ign cont fuse
engine con fuse
fuel injector ground
fuel filter
ground the head
wiring harness?
engine coolant temp sensor aka ECT
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Old 09-03-2014, 03:14 AM   #12
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Ive checked almost all of that. Next step is CAS. Ive replaced all fuses and checked the harness and associated wiring. After the CAS ill probably check the packs themselves. Just hard to believe that all 4 would fail at once
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Old 09-04-2014, 12:36 AM   #13
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Idk if this would make sense in you're situation but when my ka wasn't getting spark we found out the that the wire from the distributor to the fuel rail went right under the breather hose from the valve cover which pushed it against a sharp edge causing the wire to cut= no spark


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Old 09-04-2014, 01:54 AM   #14
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Quote:
Originally Posted by bushybeardedtaco View Post
Idk if this would make sense in you're situation but when my ka wasn't getting spark we found out the that the wire from the distributor to the fuel rail went right under the breather hose from the valve cover which pushed it against a sharp edge causing the wire to cut= no spark
I'll have to check for that to see if it could be similar. Thanks
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Old 09-04-2014, 01:00 PM   #15
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Spark tester incoming.......................................... ......
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Old 09-06-2014, 12:32 AM   #16
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How would I go about checking the resistance/continuity to my CAS?

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