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1996 Nissan Sentra?No fire

Tiny
TLCINKY
  • MEMBER
  • 1996 NISSAN SENTRA
  • 1.6L
  • 4 CYL
  • FWD
  • MANUAL
  • 150,000 MILES
I pulled a great running motor from my 95 200sx and dropped it into a 96 sentra. The wiring harnesses are identical and everything plugged in fine. Problem is it won't fire now. It ran fine right up till I pulled it. There are 2 plugs that are the same. One goes to ignition coil and other to the crankshaft sensor. If they are wire wrong could that keep it from firing?
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Thursday, May 14th, 2015 AT 11:53 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
You know each item does different things so no plugs can be mixed up. The crankshaft position sensor develops a very low-level signal to tell the Engine Computer when to fire spark plugs and injectors. The computer runs the ignition coil or coil pack. I find it odd they'd both have the same plugs, but of course they can't be switched. You'll have the computer waiting for a signal from the ignition coil, which we know is never coming, and it will be trying to get spark from the crankshaft position sensor. There's no way you're going to get spark from him.
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Friday, May 15th, 2015 AT 12:24 AM

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