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Crankshaft sensor replacement

Tiny
FAITH98
  • MEMBER
  • 2008 PONTIAC G5
  • 178,000 MILES
My car started to have a rough idle and wouldn’t let me gain speed. The RPM's would go down and I would slow down. Checked the engine light and it threw a mass airflow sensor code and a crankshaft position sensor code. I replaced both sensors. The car worked for about a day and then when it went to start it the next day I’m back to having the same issues. If I can finally get it to start the idle is very rough. Please help this is frustrating.
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Sunday, December 20th, 2020 AT 12:05 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

Have the same codes returned? As far as the idle issue, that is usually caused by an engine vacuum leak, need of a tune-up, or fuel pressure.

First, let's check and make sure there are no vacuum leaks. Since you replaced the MAF, confirm the air inlet tube is properly attached. Also, here is a link that shows how to locate a vacuum leak:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

That is where I would start. Let me know if the same codes have returned and I need to know the engine size, 2.2L or 2.4L.

Let me know.
Joe
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Sunday, December 20th, 2020 AT 10:20 PM

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