Codes P0171, P0174, P0101

2004 CHEVROLET SUBURBAN
170,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC
Avatar
OKIONE80
  • MEMBER
  • 1 POST
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.
Jan 23, 2018 at 3:39 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
STRAILER
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 54,178 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
Jan 25, 2018 at 10:13 AM
Advertisement