# 99 Nissan Sentra won’t stay on!

**URL:** <https://community.cartalk.com/t/99-nissan-sentra-won-t-stay-on/121036>\
**Category:** Maintenance/Repairs\
**Tags:** nissan, sentra\
**Created:** [July 15, 2018, 2:47am UTC](https://community.cartalk.com/t/99-nissan-sentra-won-t-stay-on/121036 "2018-07-15T02:47:54Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Reggies\_Cutz](https://avatars.discourse-cdn.com/v4/letter/r/e47774/32.png) [@Reggies\_Cutz](https://community.cartalk.com/u/Reggies_Cutz)\
**Post date:** [July 15, 2018, 2:47am UTC](https://community.cartalk.com/t/99-nissan-sentra-won-t-stay-on/121036/1 "2018-07-15T02:47:54Z")

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So I have a 99 Nissan Sentra with 113k miles on it , one day it just sputtered and died on me every since then it won’t stay on ! I’ve changed the spark plugs , the mass air flow sensor , throttle position sensor and the fuel filter and still the same problem, can’t seem to figure it out ! It will turn over and go to 100 rpms then a few seconds later the rpms will start bouncing up and down getting lower and lower till it dies ! I did have a error code but the code was only the maf but I changed it and still won’t stay running

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**Author:** ![bcohen2010](https://avatars.discourse-cdn.com/v4/letter/b/779978/32.png) [@bcohen2010](https://community.cartalk.com/u/bcohen2010)\
**Post date:** [July 15, 2018, 3:17am UTC](https://community.cartalk.com/t/99-nissan-sentra-won-t-stay-on/121036/2 "2018-07-15T03:17:02Z")

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I had this problem when the fuel pump failed in my Dodge Caravan. I was stopped at a light, and it suddenly started running really rough and then stalled out. It would restart, but wouldn’t stay running once I shifted the transmission out of “P”. I had it towed home, and tried a new MAP sensor and idle air control, since information online showed those were the two most common causes of this problem.

When those did not help, I sprayed starting fluid into the intake while someone else started it and revved up the engine. Then I knew it was a fuel problem, and since I had already changed the fuel filter, fuel injector, and fuel pressure regulator due to another problem, this time it had to be the fuel pump. I bought it online, for a fraction of what the local chain auto parts stores were charging, and replaced it.

If you do this, and find a failed fuel pump, then I strongly suggest buying a QUALITY brand such as Denso First Time Fit, Delphi, or AC Delco. Do not buy the cheapo brands such as Airtex/Wells or Spectra Premium. The effort required to do this repair, even if you DIY it far exceeds the cost savings!

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [July 15, 2018, 5:22pm UTC](https://community.cartalk.com/t/99-nissan-sentra-won-t-stay-on/121036/3 "2018-07-15T17:22:32Z")

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The problem might be with the crankshaft position sensor.

[https://www.rockauto.com/en/catalog/nissan,1999,sentra,2.0l+l4,1356825,ignition,crankshaft+position+sensor,7196](https://www.rockauto.com/en/catalog/nissan,1999,sentra,2.0l+l4,1356825,ignition,crankshaft+position+sensor,7196)

If the computer loses the signal from this sensor the engine won’t run.

The reason it could be the crank sensor is, the tach gets its signal from this sensor.

Tester