Question about 2003 Cadillac Deville

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Codes po174/171 cadillac deville northstar engine

The car is idling rough and when mashing the accelerator down to floor
car will shutoff i replace mas in air cleaner hose no change

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  • jason randeau Jan 14, 2009

    98 cadillac deville, car runs rough and p0171 ,p0174 come up.

  • Anonymous May 05, 2009

    i have the same problem with a 97 deville 4.6 northstar engine what excactly does it mean. p0174 p0171 wtf do i check it got me going crazy

  • ana vel Nov 08, 2009

    where is safety switch on a 96 caddy deville

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Check for vacuum leaks around the intake. This is the most common cause for these codes.

Posted on Mar 16, 2009

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These are the trouble codes description, well some what gives you a start where to look for... Auto zone will give you a print out of your codes for free in dallas...



P0170 - Fuel Trim Bank 1
P0171 - Fuel Trim System Lean Bank 1
P0172 - Fuel Trim System Rich Bank 1
P0173 - Fuel Trim Bank 2
P0174 - Fuel Trim System Lean Bank 2
P0175 - Fuel Trim System Rich Bank 2

Posted on Dec 18, 2008

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I have a 2000 Deville base with the northstart 4.6.....I cleaned, sprayed and even replaced the mass airflow & map sensor and still the same shaking at idle and codes were present. This is a vacuum leak issue no doubt so I removed the intake plenum and noticed that the inner connection hose to the intake fitting had a small crack, clean thorough and check....I had removed twice before I noticed it.....This is the problem you guys..you just cant see it sometimes.,,,,and It worked after replaced,,,then clear the codes......p.s ,and you will had to replace the intake gaskets as well while doing this...it cost me $14.00 and 1hr & 30 mins of my time..

Posted on Aug 19, 2012

  • Tony Fortner Jun 03, 2013

    I am having the same issue with my 2002 Deville.. I bought it new and it has 152000 miles on it.. It has been the best car that I am have ever owned. This is making me nuts and with the wife driving it... it makes me crazier.. UGH women..lol Sean,, Is it really that easy to do? I am very good with cars,,, just never had to do anythign on the Northstar

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I had same codes.. O2 sensors.. Upstream/Downstream. Ran great after 4day I got P1640

Posted on Jun 13, 2016

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My 94 Toyota Camry 4 cyl is running really rough and stalling out once the engine warms up


1. Error Code 24. Intake Air Temperature Sensor.
Solution:
Check the following:
- IAT Connector and wiring.
- Intake Air Temperature Sensor.
- Engine Coolant Temperature Sensor.
- ECM.
2. Rough Idling when the engine is hot.
The following are the reasons due to which the engine can perform bad when it is hot.
- Fuel pump control circuit.
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2007 chevy uplander running real rough, what could it be?


Vacuum Hoses
  • A loose or broken vacuum hose causes rough idling, and is the easiest repair of all. This is a very common problem since hoses wear out over time. Look in your engine compartment, and examine the hoses carefully for any signs of abrasion, breaking or loosening. Replace any damaged or broken sections of hose, available at most auto parts stores, and your rough idling will more than likely disappear.
Clogged Filters
  • Clogged filters are another common cause of rough idling. Inspect your air filter. If dirty, replace it. Also, a clogged fuel filter causes rough idling. It's hard to tell if a fuel filter is clogged or not, so a good rule of thumb is to change it at every general tune-up.

Electrical Components
  • Bad spark plugs, bad spark plug wires and a bad distributor cap are other common causes of rough idling. If it has been a while since you changed these components, do so. Most auto service centers can do this for you if you need technical expertise.
Timing Belt
  • A timing belt jumping a tooth is also a cause of rough idling. This throws off cam timing, setting in motion a series of events that prevent your engine from achieving proper timing. This is a more in-depth repair and, if needed, should be referred to a qualified auto mechanic.

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Car dying during slow down to stop, and while in park vehicle will move slightly if accelerator is mashed


If this was a EGR problem you would have a rough idle,If you are a 3.1 you are equipt with a MAP sensor this map sensor has a high failure rate with the vacuum hose connection and the MAP itself,This can be you culprit, If you are a 3.8 the culprit is the MAF mass air flow sensor.3_17_2012_8_55_47_pm.jpg3_17_2012_8_55_56_pm.jpg

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I have 1999Chevy suburban with 6.5 turbo diesel motor.it idles up and down and when driving the gas pedal is real touchy Wat is the problem and were do i locate the problem


Check the help links related to this problem.Click the link below to go through its troubleshooting procedure :-----Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html---------
Car won't start without hitting the gas pedal? http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-without-hitting-gas.html
-------Complete loss of brake pedal then all gets normal? http://repairhelpcenter.blogspot.com/2012/01/complete-loss-of-brake-pedal-then-all.html
------Car dies when gas pedal is pressed? http://schematicsdiagram.blogspot.com/2011/12/car-dies-when-gas-pedal-is-pressed.html
--------Pushing on the gas pedal, but the car slows down? Gas pedal to the floor and the car slows down?

http://technoanswers.blogspot.in/2012/02/pushing-on-gas-pedal-but-car-slows-down.html

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After replacing brake rotors and pads, brake pedal remains on floor? http://technoanswers.blogspot.in/2012/02/after-replacing-brake-rotors-and-pads.html

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accelerator pedal sensor? http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

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For rough idle issues and problem troubleshooting,go through the help links provided below :----- van idles rough?

http://howtobyme.blogspot.in/2012/01/2004-ford-freestar-van-idles-rough.html

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will not idle when cold?

http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html

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runs lean and idles rough?

http://technoanswers.blogspot.in/2012/02/ford-runs-lean-and-idles-rough.html

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Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

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Erratic idle on car?

http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

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Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

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Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

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Engine quits at idle?

http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

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Car overheats and Air blows hot at idle?

http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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This will help.

Thanks.

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1 Answer

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Clean the throttle body with throttle body cleaner and make sure the air filter is not dirty or plugged.Also clean the mas air flow sensor with mass air flow sensor cleaner.Give this a try and let me know if it took care of your problems.Hope this helps.Good luck.

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try cleaning the IAC (idle air control) sensor and check the hoses going to the MAF (mass air flow) sensor, i have found both causing me problems with erratic idle. the IAC was totally gunked up with carbon on the pintle and i had found that the screws holding it down were loose ( but only clean this with throttle body cleaner, not carb cleaner it might damage the sensor, and replace the vacuum hose to the MAF sensor, i found mine was cracked and old and brittle, a car that has been run poorly for a long period of time might also cause a problem with an oxygen sensor and this would lead to poor fuel economy also, try to clean that up or just replace it. Also have the transmission fluid serviced, i have seen this problem lead me to think i had an engine idle problem or rough perforamance when accelerating. can you rate this!

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1 Answer

Rough idling


Hello! Rough idle and perhaps poor acceleration are, for the most part, caused by a defective MAP (mass air flow sensor). This device, in part, is responsible for fuel flow regulation. This component fails when screen becomes fouled. To locate this device follow the exit hose out of the air cleaner box. The MAP sensor is connected between filter exit hose and throttle body hose. It is a black tube with a screen element inside and has a plug connected to it's side.

The average cost at a auto parts store is $85+$45 (core charge); The core charge is refunded when you bring back the defective part.

It is possible, at times, to clean the screen. However you'll need to purchase the proper cleaner. Radio Shack has a product called "Deox it; catalog # 64-4338. This product sells for around $15 (included is a gold contact cleaner). It is designed to clean electrical parts without leaving a residue.

Disconnect both hose clamps, and plug; carefully remove the sensor, clean and replace. Also , at this time, change the air filter, check hoses for any splits, holes or cracks. If this does not work purchase a new MAP and install.


Guru............saailer



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