Car jerking while driving

Tiny
SISA
  • MEMBER
  • 1999 FIAT UNO
  • 1.1L
  • 4 CYL
  • 2WD
  • MANUAL
  • 405,623 MILES
My car has started jerking while driving to a point that if it has parked for some time it will drive perfectly then again start jerking after twenty to twenty five minutes.
Friday, April 5th, 2019 AT 4:11 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Welcome to 2CarPros.

This could be a few things. The first thing I would recommend checking is the crankshaft position sensor. When they are going bad, heat can cause them to lose connection and cause stalling, misfires and other issues. Take a look through these links:

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

If the sensor is good, I suggest checking fuel pressure when the issue happens. Here is a link that shows how that is done. The pump may be going bad.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Do these things and let me know what you find. Also, if the check engine light is on when the engine is running, you really should have the computer scanned to identify diagnostic trouble codes. Here is a quick video showing how it is done:

https://youtu.be/YV3TRZwer8k

I realize most people don't own a scanner, but often times a parts store will do it for free or rent you a scanner.

Let me know what you find or if you have other questions.

Take care,
Joe
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Friday, April 5th, 2019 AT 9:07 PM

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