Question about 2004 Cadillac SRX

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I HAVE CODES PO171 AND PO174 04 CADILLAC SRX 4.6L

I AM AT THE END OF MY LIST WITH THIS...CAN YOU HELP..ANY IDEAS....I HAVE RELACED UPSTREAM 02 SENSORS CATALYTIC CONVERTER, FUEL FILTER, SPARK PLUGS, COIL PACKS, INTAKE GASKETS, HAVE DONE AN INJECTOR SERVICE, FUEL PRESSURE MAINTAINS 58 TO 60 PSI, PERFORMED SMOKE TEST ON ENTIRE SYSTEM FOUND NO LEAKS, SPRAYED COMON AREAS WITH BRAKE CLEAN, ADDED PROPANE GAS THRU INTAKE BEHIND MAF SENSOR TO TRY AND RICHEN THE SENSORS ......CHECKED ALL WIRING TO AND FROM FRONT O2 SENORS, AND MY READINGS ON THE O2 SENSOR REMAIN TO BE STUC AT 36 TO 40 AND THE LADA READINGS ARE STUCK AT .002......ANY IDEAS WOULD BE APPRECIATED.........VEHICLE ONLY HAS 63000 MILES ON IT ....THANK YOU CHRIS

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  • Eric Speed
    Eric Speed Apr 18, 2014

    run only high octane fuel these codes sounds like low quality fuel. this car is senstive to low quality fuel..

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  • Cadillac Master
  • 796 Answers

Please go to : repairpal.com/obd-II-code-po171-and-PO174 FOR MORE INFO, good-day!

Posted on Apr 17, 2014

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Posted on Jan 02, 2017

  • 11091 Answers

SOURCE: My 2002 Cadillac Service Engine Light came on,

the code for gas cap? is also a code for small leak in evap system which includes the fuel /vent lines and canister check that the lines weren't damaged when cat was put in also check coolant sensor in reservoir connections runs by exhaust system

Posted on Nov 01, 2009

wireguy212
  • 1627 Answers

SOURCE: how do i fix my 2001 cadillac catera idle problem

The problems you are describing indicate to me that you likely need to replace the coil pack that runs from the spark plugs ,and the plug wires end up at it.It also may be the spark plug wires,get a water bottle and spray the wires after dark and if you get a light show from them then replace them,if not,replace the coil pack.

Posted on Jul 15, 2010

  • 1 Answer

SOURCE: 2007 CADILLAC SRX

Recently had the same problem my friend......The O2 Sensor can simply mean that your gas cap is not on tight enough, or possibly your purge solenoid.
I am just a regular average guy, and I am retarded when it comes to cars, so I asked a mechanic on ask.com cadillac, or something like that...anyways......The purge Solenoid only costs about 35 dollars, and is super easy to replace. The hard part is getting your card started again after your battery is hooked back up because of the Cadillac theft detterant system. After you put the Purge Solenoid in, and hook up your battery make sure you do the following to bypass the security system:
1. Turn key in ignition all most all the way on, but don't turnover.
2. Leave in this position for 10 min exactly
3. Turn key back for five seconds
4. Repeat this sequence four addtional times.
5. On the fourth time the car will turnover, and you are good to go.

I hope this helps, cause cadillac almost bent me over on this one....
Dom

Posted on Aug 09, 2010

emissionwiz
  • 75077 Answers

SOURCE: Check Engine Light. I have a 03 escalade that

Your fuel pressure is WAY to low, it should be at least 55 PSI, (spec is 55-62 PSI) You will need to replace the fuel pump and the fuel filter then clear the codes and retest, the fuel pump is located inside the fuel tank, the fuel tank must be removed to access the pump. after the fuel pump is replaced if any lean codes come back from the O2 sensors the intake maniold gaskets will need to be replaced as well, they are a common problem as well but your main problem is very low fuel pressure, this alone will set all the codes you have.

Posted on Oct 28, 2010

canwoodjc
  • 3301 Answers

SOURCE: Will a bad catalytic converter

you have numerous problems to address, the cat could cause the car to smoke, but only because something is getting in it, heating up , and causing the smoke, normally if its white its due to water, and blue or gray due to a fuel issue , as far as a head gasket, if it was bad your cat could be bad too, so could the MAF sensor,, the alternator could work into this mess just due to the sensors not providing the correct signals to be sent to the computer in the car ,, but I doubt its bad , it can be simply checked, if you have a known good battery ,, use a meter and place the leads on the battery terminals, you should see a reading of between 13.5 and 14.5 volts, ( with the car running) if you do the alt is good, if not,, its probably bad,, There are two common types of mass airflow sensors in use on automotive engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with an additional sensor or two, the engine's air mass flow rate can be accurately determined.

Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0.0-5.0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings.

When a MAF is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop controller predicted air flow information (the measured air flow) to the ECU, and the oxygen sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass.

Posted on Sep 20, 2011

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