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Codes P0171, P0174, P0101

Tiny
OKIONE80
  • MEMBER
  • 2004 CHEVROLET SUBURBAN
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
I recently took my vehicle to the shop to have codes pulled, and got P0171, P0174, P0101. I let them replace the intake manifold gasket and I did the plug, wires, air filter, and cleaned the MAF. MAF is only twelve months old. Truck will start now but does not want to idle. It will idle for a second and then stall. It also wants to stall when coasting. Any suggestions? Could it be bad o2 sensors? I replaced all o2 sensors twelve months ago.
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Tuesday, January 23rd, 2018 AT 3:39 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
It does not sound like oxygen sensors are causing the problem. The codes are telling you the system is lean so there must be a vacuum leak or a cylinder misfire. Lets get started by following this guide to check for vacuum leaks.

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

Please run this test and get back to us.

Cheers, Ken
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Thursday, January 25th, 2018 AT 10:13 AM

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