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Po48 code on 1995 cadillac deville rough at idle

Po48 code on 1995 cadillac deville rough at idle and low speeds 4.9 engine.

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  • larry blais
    larry blais May 12, 2010

    You are missing a number (P048?)

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Posted on Jan 02, 2017

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SOURCE: 95 cadillac eldorado engine stalls rough idle check engine light is on

I have a 1994 Cadillac Eldorado and every time i start it the car has rough Idle and the Idle fluctuate's. I also can feel it in the gas pedal when the car is doing this I tried replacing the throttle body sensor but it still does it I also was told it was the Idle error sensor. So instead of spending the unecessary money again I thought I would go online and see if anyone could help me with this problem.

Posted on Oct 05, 2008

  • 1 Answer

SOURCE: codes po174/171 cadillac deville northstar engine

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

Posted on Mar 16, 2009

  • 583 Answers

SOURCE: Rough low idle in gear when stopped at a light.

probable vacuum leak query brake booster

Posted on Jul 26, 2009

  • 5 Answers

SOURCE: my 1995 Nissan Altima idles rough when at a stop

change ur Airflow sensor buddy. thats the only problem. And if yet it doesnt work then check ur crank sensor....

Posted on Aug 04, 2009

  • 636 Answers

SOURCE: Rough Idle/Runs Rough and low power

I would take it in and have them do a diagnostic on it, sounds like the cam shaft sensor to me.

Posted on Sep 19, 2009

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Check engine light flashing check engine soon smell of gas and not running smouth


Check engine light flashing means there is a bad misfire , it flashes to tell you your damaging your catalytic converter . You need to have it check , you don't won't to have to replace the catalytic converter . Can cost up to $1,000.00 . Flashing Check Engine Light CarMD

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How to fix code e98 1991 deville


Probably two different issues.

The code is saying the computer sees the engine RPM is too high when shifting between park neutral and drive.
The rough idle would be something else.

Jul 01, 2012 | 1991 Cadillac DeVille

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Set timing mode 1995 cadillac deville


Depending on the trouble codes, it may be the ECM. (computer)
You can have the car scanned for codes or attempt it yourself.
The "set timing mode" is the section of the computer program that you access to change the base timing. It should not show up on the display unless you access it.

Jun 26, 2012 | 1995 Cadillac DeVille

1 Answer

Why does 1995 cadillac deville have a rough idle


When was the last time you had your spark plugs replaced? Sounds like a miss to me.

Mar 25, 2012 | 1995 Cadillac DeVille

1 Answer

I Have a 95 deville , replaced thermostat and have heat only when engine RPM ran up , nothing on idle speed. Whats up?


Either you are low on coolant or you still have an air pocket in the system after you replaced the thermostat.

With the engine cold remove the radiator cap. Top off the radiator if low. Start the engine and allow to warm up at idle, topping of the coolant as necessary. Once the thermostat has opened, the upper hose will get hot. Snap the throttle a couple of time. This will help force coolant into the heater core and push out the air. Once the cooling fans come on replace the radiator cap.

Raise the engine RPM'S to about 2,500 and hold it until there is sufficient heat out of the vents. Let the engine idle, Id there constant heat? If not snap the throttle a couple more times and then raise the RPM's up again.

Dec 14, 2010 | 1995 Cadillac DeVille

1 Answer

I got an diagnostic and it said the idle air valve is bad.i got it changed but its still runnin rough


A idle speed motor will not cause your engine to run rough.It might idle high or stall. If your engine is running rough check your spark plugs and wires along with your cap and rotor first.

Dec 02, 2010 | 1991 Cadillac DeVille

1 Answer

Idle on my 1992 cadillac deville is very low


no take that ****** out and give it a bath in carb cleaner 20 mins coat with wd 40 reinstall if its better by a new one any way only a temporary fix dont////dont turn any screws

Jan 09, 2010 | 1992 Cadillac DeVille

2 Answers

1995 Cad. Deville. Engine light on, runs rough especially on idle. I was told that maybe the emc monitor may be problem? DDT


When was last time you replaced, fuel filter, plugs and wires, and had the injectors cleaned.

Sep 08, 2009 | 1995 Cadillac DeVille

1 Answer

My 2003 ford focus SE shuts off when i come to a complete stop. It does not have a rough idle and it does not do it everytime.


Here are the most common causes of surges, stalls at stops, low erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

Apr 06, 2009 | 2000 Cadillac DeVille

1 Answer

''What is PO48 Current'' and ''PCM?''


Po48 is an EGR system malfunction in the PCM...powertrain control module AKA computer..brain....The EGR valve isnt opening when it should. Either it leaks or there is no vacuum supply or the passage is blocked with carbon

Nov 20, 2008 | 1994 Cadillac DeVille

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