Question about 2003 Cadillac Escalade Esv

2 Answers

My 2003 escalade is running rough in idle

The codes showing are PO174 and PO171. I have changed the gas filter the oxygen sensors and the mass ir flow with no improvment.

Posted by on

Ad

2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Sergeant:

    An expert that has over 500 points.

    Champion:

    An expert who has answered 200 questions.

  • Expert
  • 208 Answers

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

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

  • Cadillac Master
  • 35,601 Answers

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

Ad

2 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get 2 Free calls (no credit card required) and instant help on almost anything you can think of (from cars to computers, appliances, handyman, and even pets).
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

airjer995
  • 5332 Answers

SOURCE: 2002 Cadillac Escalade code po102,po171,po174

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

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My cadillac escalade runs rough in idle.


PO174 &171- Both banks lean. This could be caused by a defective MAF or O2 sensor but something as simple as a vacuum leak could cause this problem. Also make sure there are no air leaks from the MAF sensor to the intake manifold. I have repaired many vehicles with these codes that was caused by a vacuum leak. Hope this helps

Nov 27, 2013 | Cadillac Escalade Cars & Trucks

1 Answer

2003 Ford Expedition check engine light on .Codes PO171 & PO174


This is a tough one could be mass air flow sensor ,oxyegen sensors,a fuel filter. a vacum leak, a pcv valve if i missed anything just google po 171 &174 look for fix ya this issue has been addressed many times first check the vacum lines includeing the line on the pcv valve for cracks or splits in the lines .I would do the fuel filter if it hasnt been changed in the last couple of years , if still a problem the MAF sensor if your happy with my advise please leave me with great feedback

Feb 18, 2013 | 2003 Ford Expedition

1 Answer

We have a 2000 Jaguar XKR code PO171 and PO171 . Can you help...we've changed the fuel filter but didn't help. Thanks


if i am not mistaken that code is for a oxygen sensor...does it idle rough?what is it doing?

Jul 30, 2011 | 2003 Jaguar Xkr

2 Answers

Ford f150 2003 po171 always lean bank 1. replaced bank 1 o2 sensor smoked intake. replaced egr valve. still code po171 short term trim 0123 but long term trim is up bank 1 30 anb bank 2 is 27. idle is a...


Code Po171 indicates a lean condition on cylinder bank #1 of the engine. This is the drivers side of the engine. I would suggest replacing both front oxygen sensors as a pair to start. An oxygen sensor has a life span of about 5 years and yours are now 9 years old if they are original. When they get older they are slow to respond to changes in the oxygen content of the exhaust and can trigger a code Po171. If you continue to have the same code set after the replacement of both oxygen sensors then it is time to find out why your engine is running lean. Some of the most common causes are an ignition misfire and a vacuum leak. I have also seen Fords EGR flow sensor (known by Ford as Delta Pressure Feedback sensor) to cause problems like that as well. A good mechanic with a scan tool can usually spot a problem like that in a few minutes.

Mar 01, 2011 | Ford F-150 Cars & Trucks

1 Answer

I have a 04 expedition the engine light came on the code read po171 and po174 it die out when I'm at a red light but cranks back up missing bad when it warms up


P0171 - Fuel Injection System Too Lean Bank 1
Possible Causes:
- Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection

P0174 - Fuel Injection System Too Lean Bank 2
Possible Causes:
- Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection

Jan 14, 2011 | 1998 Ford Expedition

1 Answer

2002 Cadillac Escalade code po102,po171,po174 comes up runs rough at start up then get better but still rough.


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.

Dec 28, 2010 | 2004 Cadillac Escalade Ext

2 Answers

1999 gmc yukon obd11 codes po101 po171 po174 po429 what could be the causes


ok heres problem 101 is mass air flow sensor 171 running too rich 174 running too lean can find 429 but it the same lines i believe take out your mass air flow sensor and clean it check it connection if comes back on replace the mass air flow sensor

Sep 24, 2010 | GMC Yukon Cars & Trucks

1 Answer

Code po171 7 po174


your computer is reporting bank 1 and 2 too lean, usually caused by the mass air flow (MAF) sensor, you can usually clean this sensor and reset the light. Clean it with electric cleaner or brake cleaner, make sure it is dry before reinstalling, also take care not to damage it. Hope this helps, let me know

Jun 09, 2009 | 1997 Ford Thunderbird LX

Not finding what you are looking for?
Cars & Trucks Logo

190 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cadillac Experts

yadayada
yadayada

Level 3 Expert

76630 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8516 Answers

Are you a Cadillac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...