Question about Pontiac Grand Prix

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The car when i pull off i get a hard or rough vibration like the whole car is shaking and i took it and got a diagnostic and the code is p0420

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  • Pontiac Master
  • 3,640 Answers

Please go to this site, it will explain this code. p0420-www.p0420.com

Posted on May 22, 2011

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What would cause truck to shake very hard or rough when starting?


I really need to know the mileage.....?..also the question isn't very clear ...Is the whole truck shaking roughly or is the engine shaking roughly or is it both the engine and truck shaking..?..Since I am not sure I will answer what I can....Ok......If the truck is shaking while sitting still at idle the engine/trans mounts could be worn and or loose mounting hardware...If the engine is running roughly at idle causing all to shake that bad it could be a number of things causing it as usual...Quite often a faulty plug wire/and or bad plug will make it have a misfire because it will be running on only 5 cylinders..If that's the case it could be more than one bad...A vacuum leak will cause it to perform in the same manner...however all cylinders will be firing..Normally a vacuum leak is easy to pinpoint..however it could be a faulty IAC valve..(IDLE AIR CONTROL)..The idle air control is designed to hold a high idle at start up then slowly bring idle down to proper Rpm.....A faulty TPS (THROTTLE POSITION SENSOR) will also cause a rough running problem..And let's not forget the O2 sensor..(OXYGEN SENSOR)..The O2 sensor controls air/fuel mixture...and yes an exhaust manifold gasket will make it run rough but not too bad...It has a rough running sound more so than causing it to horribly shake..It will shake but not to bad..
it is located at the exhaust side of engine..The exhaust manifold is mounted to the engine exhaust port..the exhaust pipe is mounted to the exhaust manifold and the muffler/cat converter is mounted to the exhaust pipe...You can check the plug wires quickly..With engine running carefully remove plug wires 1 at a time..If the sound of engine gets worse the wire you removed is good..after verifying it is good or bad plug wire back on then pull the next wire..and so on..If you pull a wire off and there is no change in engine operation that is the bad wire..If that is the case change all plugs and wires...One at a time..(It is a good idea to make sure all wires come off easily before starting engine..old wires will come apart easily..grasp wire tightly at boot and twist left to right while pulling..)as far as the other components I spoke as well as many others,the best,easy way is to have it hooked to a scanner and they can check/test all components for proper operation...Now..If it runs good but is shaking the engine/trans mounts are worn as I stated earlier..any loose engine component will cause an engine shake also but you should notice it at a glance...engine mount bolts/nuts being loose can be tightened without changing mounts if caught in time..Trans could be coming loose.also worn clutch will cause vibration...Send more info and I can guide you to remove and replace any faulty components you may find to save you money.........Brooks/Metalpoet.....

May 17, 2014 | 1993 Chevrolet S-10

2 Answers

I have p0420 on my 06 pont gp gt. it mostly comes on after I slow down after highway


Here is the trouble tree for that code it is most likely a bad cat but follow the trouble tree to see where it lead's you.
DTC P0420 or P0430

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Testing and Inspection\Initial Inspection and Diagnostic Overview\Diagnostic Starting Point - Vehicle
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P0420

* Catalyst System Low Efficiency Bank 1

Important: A new converter with less than 100 miles on it may set DTC P0420 or P0430 due to out-******* of the internal matting. Operating the vehicle at highway speeds for approximately 1 hour may correct the condition. Hope this helps

Feb 01, 2011 | 2005 Pontiac Grand Prix

1 Answer

Rough idle, engine is vibrating and when it is put


Possible but highly unlikely. Sounds like a dead miss.

May 31, 2010 | 1999 Ford Taurus

1 Answer

Vibration that shakes the whole car


If this engine has a fan clutch check to see if the clutch spins freely when the engine is shut off. If its frozen that will cause a vibration which will shake the entire car.. The next item of interest would be the torque convertor in the transmision. They can shake a car very well also

Jan 23, 2010 | 1995 Mercury Cougar

3 Answers

98 chevy astro vibrates at 65mph wats wrong


it sounds like your tire is out of balance just take it to your local tire shop and have them rotate and rebalance the tires

Apr 14, 2009 | 1997 Chevrolet Astro

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Check Engine, VSC, and Trac off lights are all on in my 2005 xB


You need a scan tool to retreive the diagnostic trouble code in the VSC system

Mar 11, 2009 | 2005 Scion xB

1 Answer

Car running rough, check engine and coolant light on


take it to an auto parts store and have a diagnostics test done

Jan 10, 2009 | 1996 Chevrolet Cavalier

3 Answers

P0420 and P0430


P0420 and P0430 are codes related to the catalytic converter effeciency. The catalyst will need to be replaced $$.

May 19, 2008 | 2000 Nissan Maxima

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