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