Issues with p1174
Thread Starter
6th Gear
Joined: Feb 2021
Posts: 6
Likes: 0
From: Colorado
Issues with p1174
Well, cannot get this code figured out on my 2009 base. 52k miles. Keeps kicking P1174. I visually inspected every line I could find, fuel trims are good when the code kicks and at idle,swapped oxygen sensors to opposing sides and it didn’t follow, swapped injectors to the opposite side and it didn’t follow, new spark plugs. Any other ideas before I sell this damn car?
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,627
Likes: 4,071
From: Cape Coral, Florida
What are your fuel trims right now on both banks ??...if your long terms are more than 10% you should be concerned...if you raise your RPM to around 3000 and long terms slowly decrease you have a vacuum leak...if you have lean codes or elevated long terms on bank 2 your diagnosis will now be concentrated to either MAF or fuel delivery..not bank specific !!...fuel trims increase under load if it is a MAF or fuel delivery however this will involve BOTH banks !!
Last edited by C5 Diag; Feb 24, 2021 at 05:53 PM.
Thread Starter
6th Gear
Joined: Feb 2021
Posts: 6
Likes: 0
From: Colorado
What are your fuel trims right now on both banks ??...if your long terms are more than 10% you should be concerned...if you raise your RPM to around 3000 and long terms slowly decrease you have a vacuum leak...if you have lean codes or elevated long terms on bank 2 your diagnosis will now be concentrated to either MAF or fuel delivery..not bank specific !!...fuel trims increase under load if it is a MAF or fuel delivery however this will involve BOTH banks !!
Thread Starter
6th Gear
Joined: Feb 2021
Posts: 6
Likes: 0
From: Colorado
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,627
Likes: 4,071
From: Cape Coral, Florida
What do your long and short term fuel trims look like at 3000 RPM...hold it there for a few minutes and let me know !!
Thread Starter
6th Gear
Joined: Feb 2021
Posts: 6
Likes: 0
From: Colorado
I’ve been tied up the last couple days so haven’t been able to check. I should be able to tomorrow. Also ordered a smoke tester that should be in tomorrow so I can hopefully find any vacuum leaks if that is what is going on.
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