Cam and crank position sensor replacement failed to remove negative battery cable from battery, now it will not start

2005 NISSAN FRONTIER

200,000 MILES • 4.0L • V6 • 4WD • AUTOMATIC

CAK1969

MEMBER
2 POSTS

I have replaced both cam sensors and crank sensor. However, i failed to remove negative battery cable from battery. Now, i get engine turnover but no start. What could have gone wrong? Thanks for your help in advance.

Mar 13, 2019 at 8:18 AM

JACOBANDNICKOLAS

✓Experienced Mechanic
110,240 POSTS

Welcome to 2CarPros.

Honestly, if the key was off, you should be fine. However, it is recommended to prevent power surges to the control modules. Have you checked to see if your getting spark to the plugs? Here is a link that shows how to check:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Do this and let me know the results.

Joe

Mar 13, 2019 at 12:36 PM

CAK1969

MEMBER
2 POSTS

Yes, i am getting spark, but it barely fired one time but not enough to start it. BTW, the key was in ACC mode for a little while when the O2s and cams and crank sensors were being replaced. What have I done? Worry's me, scratching my head.

Mar 14, 2019 at 7:09 AM

JACOBANDNICKOLAS

✓Experienced Mechanic
110,240 POSTS

The accessory position wouldn't have allowed power to get to the ignition. Tell me, is the spark a good hot blue snapping spark or is it more orange or white?

Mar 14, 2019 at 10:40 AM

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