Code P0505, idle problems?

2000 INFINITI I30
200,000 MILES • 2WD • AUTOMATIC
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CHARLESTUCK
  • MEMBER
  • 62 POSTS
The car cuts off after slowing down and stopping. Does not idle well.
Apr 30, 2024 at 6:58 PM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 POSTS
Hi,

Oftentimes, an erratic idle is caused by an engine vacuum leak. A leak allows unmetered air to enter the combustion chamber and lean the air/fuel mixture.

Here is where we need to start. I need you to check for any possible leaks. Here is a link that explains how to check:

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

Let me know what you find.

Take care,

Joe
Apr 30, 2024 at 7:24 PM
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STRAILER
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 54,176 POSTS
A P0505 error a malfunction in the Idle Air Control Valve or its control circuit. This is common when the IAC valve goes bad, and it will cause the engine to stall out. here is the location of the valve and a generic guide to help you understand what I am talking about:

https://www.2carpros.com/articles/idle-air-control-valve-service

This guide can help as well:

https://www.2carpros.com/articles/stall-at-idle

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Apr 30, 2024 at 7:33 PM