Question about 2003 Cadillac Escalade Esv
The codes showing are PO174 and PO171. I have changed the gas filter the oxygen sensors and the mass ir flow with no improvment.
Between the tb and intake manafold there is a rubber conector they tend to crack near the bottom from heat small cracks so look closley, this is common on that vehicle but may not be the problem just a place to start
Posted on Nov 27, 2013
The codes indicate your engine is running too lean. The P0171 code (bank 1) could be indicating:
1. The wiring harness should be checked for correct voltage, open, short to ground or short to voltage
2. Fuel pump pressure, regulator, or lines
3. Exhaust system leaks or restrictions
4. Vacuum leaks, danaged hoses, or improper routing
5. Fuel contamination
6. Improperly installed sensors
The P0172 code (bank 2) could be indicating:
1. A defective sensor or solenoid
2. A damaged or corroded connector terminal
3. The wiring harness should be checked for correct voltage, open, short to ground or short to voltage
4. The control unit software nedds updating
5. The PCM or ECM is faulty
6. The fuel mixture is lean
7. Faulty fuel pump, regulator or lines
Note: The MAF is not mentioned as a cause
Posted on Nov 27, 2013
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Posted on Jan 02, 2017
Anytime I see P0171 and P0174 together the first thing I look for is vacuum leaks. Specifically the upper intake plenum gaskets. The codes indicate that both banks of the engine are running lean. The rough run at start up and then gets better supports this.
With the engine running rough carefully spray carb spray around the area where the intake bolts to the heads. If the idle changes and or smooths out you found the leak. Be careful when doing this as carb spray is flammable.
I wouldn't worry about the P0102 (MAF code) until you figure out if there is a vacuum leak or not. If there is no vacuum leak than I would investigate that code further.
Posted on Dec 28, 2010
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