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The Check Engine Light Came on Codes P0171 And p0174 Came up Meaning Its Running To Lean The Check Engine Light Went Off the Same day an After a week has Reappeared. Anybody Have This Problem? Dont Know Were To Begin......The Car Idels Rough an Sometimes Feel Like It Cant Accelerate like its supposed to..
 

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Cadillac CT6 (2019)
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2,280 Posts
Lean codes can be a product of a vacuum leak; since yours is coming and going, if it is a leak, it must be small. I would Google the code for further clarification and alternate causes that you may be able to diagnose.
 

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2008 STS Northstar RWD, 2000 Trans Am WS6 6 spd, 1968 LeMans convertible 6.6
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Is yours a 4.6? If so, first place to check is if your intake manifold bolts are loose, common problem and sometimes snugging them tighter will fix it. Google can help you with this.
 

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05 Stealth Gray CTS-V, 08 Light Platinum SRX V8, 05 White Diamond STS4 V8 1SG
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Also check brake booster hose where it connects to intake. And PCV elbow that runs back along the passenger side valve cover, and takes a turn to the rear of the intake manifold. Mine was cracked. Probably one of those three things but there are a couple of other possibilities if these don't pan out.
 

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Discussion Starter #8
Also check brake booster hose where it connects to intake. And PCV elbow that runs back along the passenger side valve cover, and takes a turn to the rear of the intake manifold. Mine was cracked. Probably one of those three things but there are a couple of other possibilities if these don't pan out.
Thank You I Appreciate the insight
 
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