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Change spark plugs wires now have a miss 75 coupe stock

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Old 04-15-2017, 08:36 PM
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pmr2000
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Default Change spark plugs wires now have a miss 75 coupe stock

Any tips to troubleshoot beyond checking no bad connections or swapped wires?

I don't have lower shields but used wire dividers and tie wraps to keep off exhaust.

Is there any issue with running wires parallel or crossing certain cylinders that would create a misfire?

I did remove my non functioning ac compressor but left hoses, wires on car side but don't think that is related...

Plugs, cap, rotor, coil all new previous weekends with no issue.

Thanks in advance for any tips.

Last edited by pmr2000; 04-15-2017 at 08:37 PM.
Old 04-15-2017, 09:14 PM
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Jims427400
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If you have a infrared thermometer you can run car for a short time and then check temp of each exhaust (easier if you have headers) the cool one will tell you which isn't firing. I just used this trick myself today. Can't take credit though. Another members idea.
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Old 04-15-2017, 10:19 PM
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stumpshot
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Only thing I can advise is to run down every wire again to make sure none are on the wrong plugs. Since it happened after a wire change, that is my bet.
Old 04-15-2017, 10:42 PM
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Big2Bird
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Originally Posted by stumpshot
Only thing I can advise is to run down every wire again to make sure none are on the wrong plugs. Since it happened after a wire change, that is my bet.
18436572

Also check the plugs "clicked" on. Sometimes they get cocked.

Did you go under the motor mounts? Sometimes they get stressed there. I always use a string, pulling the smaller cap end through there, and put dish soap on the boot for compliance.
Old 04-15-2017, 11:37 PM
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Kim72
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Run your motor at night, in the complete dark. Any shorts should show up like a blue light show. Works for me.
Old 04-16-2017, 09:14 AM
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pmr2000
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Thanks can i also try disconnecting wires one by one at distributor to see ones that does not make it worse? Hate to redo my tie wraps routing etc
..
Old 04-16-2017, 10:21 AM
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Tim Ware
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I'm sure your problem will be solved with one of the previous suggestions. But, one of my must-do tests when installing new wires, or just changing plugs, is to measure the resistance of every wire from end to end. Not only does this test the wire, but also the brass clips on each end. Just because they're new, doesn't mean they are working correctly. Also, carbon wires without reinforcement can fail if pulled too tightly.
Old 04-16-2017, 10:33 AM
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PAmotorman
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make sure the wires are all the way into the cap. slide the boots back along the wires install the wires in the cap and then slid the boots back onto the cap
Old 04-16-2017, 10:41 AM
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pmr2000
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Had 3 and 6 swapped at the dist. All is good!

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