Issues after replacing crankshaft position sensor

Tiny
DRE B.
  • MEMBER
  • 2011 HYUNDAI ELANTRA
  • 1.4L
  • 4 CYL
  • AUTOMATIC
  • 120,002 MILES
Recently replaced crankshaft position sensor went pretty well at first. Then, a few days later the engine trembling returned, although the car never shut off. But when I accelerate sometimes, it stalls and backfires a bit. Is there any residual damage that could have happened from driving around with the bad crankshaft sensor, or is there something else that I need my mechanic to check concerning the crankshaft position sensor?
Tuesday, March 29th, 2022 AT 8:38 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,097 POSTS
Hi,

In most cases, if the crankshaft position sensor is bad, the vehicle will not restart after turning it off. So, you could have an intermittent issue with it, but I don't feel it would cause a backfiring issue.

A backfire is usually the result of either an extremely lean fuel mixture (not enough fuel), or an overly rich fuel mixture (too much fuel). Either of these conditions can cause a poor idle or rough running condition.

Take a look through this link for a better description:

https://www.2carpros.com/articles/engine-backfires-while-running

Also, is the check engine light staying on? If it is, have the computer scanned for codes that may help. If you don't have a scanner and the vehicle is drivable, most parts stores will do it for you free of charge.

If codes are found, let me know what they are. Also, if you do have a scanner that can read live data, let me know what the short-term fuel trims are.

Let me know if this helps answer your questions or if I can help in any way.

Take care,

Joe
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Tuesday, March 29th, 2022 AT 7:49 PM
Tiny
DRE B.
  • MEMBER
  • 2 POSTS
Thank you! So far, the engine light has not stayed on. It will flash quickly with the stall or the backfire. I will definitely take your advice and check out the link you gave me. Thanks again, I will keep you updated!
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Wednesday, March 30th, 2022 AT 8:38 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,097 POSTS
You are very welcome. Let me know your thoughts or findings so we can get it running properly.

Take care,

Joe
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Wednesday, March 30th, 2022 AT 7:43 PM

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