Question about Cadillac Escalade

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My cadillac escalade runs rough in idle.

PO 174 and PO 171 are the codes that appear. We changed the mass air flow sensor and the oxygen sensors with no improvement

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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

Posted on Nov 27, 2013

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Posted on Jan 02, 2017

  • 422 Answers

SOURCE: I have a 1999 oldsmobile

fuel pressure regulator on the fuel rail is probably it or the egr valve is stuck open allowing burnt fuel to flood the intake, im leaning towards the fuel pressure regulator because the o2sensor is probably reading rich or if its reading lean then i would choose the egr valve . good luck

Posted on Aug 26, 2008

roniecon
  • 6826 Answers

SOURCE: Car started hesitating then died

replace the fuel filter,if this does not help,replace the fuel pump.

Posted on Mar 03, 2010

  • 383 Answers

SOURCE: 99 Eclipse 2.4 cid idles

couple of possible problems

first thing i would check is to make sure air intake hose between Mass air flow sensor and intake doesn't have any cracks holes make sure clamps are tight

secondly check for vacuum leaks carb cleaner works great for this spray around intake gaskets throttle body fuel injectors vacuum lines when spraying u notice change in idle (if idle picks up or stubles) that where your problem is example you spray around intake gasket and idle picks up you have bad intake gasket

third thing is to try and clean the mass air flow sensor they make special cleaner for this (u can use carb cleaner for this but it can leave residue on sensor and damage it so it not recomended)

my best guess for you with all three o codes is you have a vacuum leak somewhere

Posted on Nov 13, 2010

  • 61 Answers

SOURCE: idles rough lack of power

I imagine that the check engine light is on and if so what are the trouble codes? Sounds like a miss in at least one cylinder. If you provide me with the 8'th character in the vin # and codes if any, I'll try to be of more help.

Posted on Feb 17, 2011

airjer995
  • 5332 Answers

SOURCE: PO 171 code had mass air flow sensor, both oxygen sensors, air filter, pcv valve, and tune-up and still getting PO 171 code.

Check for vacuum leaks.

Posted on Jan 16, 2012

Testimonial: "Thank You so much..You're the first person with some good advice in the last 2 wks...I kinda new smthing was still wrong but, I gotta get this fixed or I cant get my plate stickr. Youre so Kind. again thanx most helpful."

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2 Answers

My 2003 escalade is running rough in idle


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

Nov 27, 2013 | 2003 Cadillac Escalade Esv

1 Answer

Scanned my computer , came up with a PO 171 and 174 what does this mean?


P0171 AND P0174
P0171 - System Too Engine Cylinder Lean Bank 1xicon.jpghttp://engine-codes.com/p0171.htmlForum CodePossible causes- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection Tech notes Dirty air filter of faulty air flow sensor are common causes for the P0171 code of the problem.


P0174 FORD - Fuel Injection System Too Lean Bank 2xicon.jpghttp://engine-codes.com/p0174_ford.htmlForum CodePossible causes- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection Tech notes The codes is usually set when there is an intake leak after the air flow meter, before replacing any parts check for loose or broken hoses and intake gasket leak. On Ford some models dirty air filter, and dirty or faulty air flow sensor are the cause of the problem.

Jul 27, 2012 | Cars & Trucks

1 Answer

2006 Ford Taurus code P0152


Common Problems That Trigger the P0152 Code
  • Defective Oxygen Sensor
  • Faulty Oxygen Sensor wiring or connections
  • Shorted Oxygen Sensor Heater element(s)
Common Misdiagnoses
  • Oxygen Sensor is replaced when the problem is faulty Oxygen Sensor wiring or connections
  • Oxygen Sensor is replaced when the problem is an over-reporting Mass Air Flow Sensor, clean mass air flow sensor first, to see if thats the problem. good-day ! just type this in search on pc. 02 sensor symtoms, and it will give you the details of a bad sensor.

Apr 27, 2012 | 2006 Ford Taurus

1 Answer

Idles rough and low intermittently. Stalls occaisionally. Error code P1137 pulled off of the computer. 2001 Alero, 2.4L Automatic trans


P1137 is HO2S Bank 1 Sensor 2 Lean Or Low Voltage. Oxygen sensor is reading a "lean condition". This code probably is stored from the rough and low idling. So it sounds like you maybe having other issues causing this P1137 code to come up. For lean conditions read this:
1. Vacuum leaks - check for failed or loose vacuum lines, leaking intake gaskets, intake air tubes loose or any other source of un-metered air leaks (leaks after the Mass Air Flow Sensor)
2. Restricted fuel filter or bent/pinched fuel system lines
3. Incorrect input from other sensors, such as the Mass Air Flow Sensor/cam or crank sensors, which may not always drop a separate code
4. Engine misfire ? Yes I know this one may seem weird. You might think that if there is a misfire then you will have all that unburned fuel and it should read rich; right? Well the O2 sensors read only oxygen content in the exhaust, so if you have all that unburned fuel from incomplete combustion then, you guessed it, you also have all that unburned oxygen. High O2 content in exhaust equals a lean reading!

Sep 07, 2011 | Oldsmobile Alero Cars & Trucks

1 Answer

99 Eclipse 2.4 cid idles erratically and eventually stalls. Unplug the air flow meter and idle quality gets much better and does not stall. Does this mean I have a defective air flow meter? Engine codes...


couple of possible problems

first thing i would check is to make sure air intake hose between Mass air flow sensor and intake doesn't have any cracks holes make sure clamps are tight

secondly check for vacuum leaks carb cleaner works great for this spray around intake gaskets throttle body fuel injectors vacuum lines when spraying u notice change in idle (if idle picks up or stubles) that where your problem is example you spray around intake gasket and idle picks up you have bad intake gasket

third thing is to try and clean the mass air flow sensor they make special cleaner for this (u can use carb cleaner for this but it can leave residue on sensor and damage it so it not recomended)

my best guess for you with all three o codes is you have a vacuum leak somewhere

Nov 13, 2010 | Mitsubishi Eclipse Spyder Cars & Trucks

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98 Lincoln Navigator Check Eng light on


fuel pump is going out causing the truck to run lean and miss

Aug 22, 2009 | 1999 Lincoln Navigator

1 Answer

What are the symptoms of a faulty oxygen sensor?


bad oxygen sensor will make a car run rough.also mass air flow sensor egr valve sticking open or pvc valve open.idle speed control problems.have your car scan.because there are many sensor causes it to run rough.

Apr 16, 2009 | 1999 Pontiac Grand Prix

1 Answer

Po 108 fault code


Sounds more like a mass air flow sensor problem.

Jan 09, 2009 | 2001 Dodge Ram 1500 Truck 2WD

1 Answer

I have a 1999 oldsmobile intrigue that is misting a lot. It idels rough, and runs rough. I can still take off it is a little slow, but I can still go pretty fast, but it still mist at the high speeds...


fuel pressure regulator on the fuel rail is probably it or the egr valve is stuck open allowing burnt fuel to flood the intake, im leaning towards the fuel pressure regulator because the o2sensor is probably reading rich or if its reading lean then i would choose the egr valve . good luck

Jul 06, 2008 | 1999 Oldsmobile Intrigue

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