Does not start after replacing the throttle body unit and serpentine belt?

MARK MAYO2

MEMBER
2007 NISSAN XTERRA
4.0L
6 CYL
2WD
AUTOMATIC
247,543 MILES

I replaced my throttle body Unit and serpentine belt at same time and now my vehicle won’t start.

Thursday, March 2nd, 2023 AT 2:53 AM

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,904 POSTS

Hello Mark,

Please remove the throttle bore inlet tube and use a flashlight to observe the butterfly while a helper tries to start the engine, you should see the butterfly move open slightly allowing the engine to start. Also, have the helper push the throttle down slightly while cranking to see if the engine starts, in which case the computer will try to relearn the butterfly position. If this doesn't work let's run the codes to see what comes up.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Let us know what happens and please upload pictures or videos of the problem.

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Thursday, March 2nd, 2023 AT 7:06 PM

MARK MAYO2

MEMBER
2 POSTS

That was helpful information though the problem ended up being that I caused my ECM to dump my security key code(s), my keys have chips in them, so my ECM placed my truck in an inoperable state. Had to pay a guy to come to my truck and reset the key codes in the ECM. A cautionary event. Never listen to someone when they say you can remove your ECM fuse/relay rather than disconnecting the negative cable! If your keys have a chip inside them removing the fuse or relay to your ECM is a huge mistake!

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Friday, March 3rd, 2023 AT 3:46 PM

KEN L