Question about 2001 Pontiac Grand Prix

3 Answers

I am getting a misfire on cylinder #5, I have changed the coil, wire and spark plug but still get the misfire error code 0305 on cylinder 5 all the time. Runs pretty rough too. I have the same problem..... I have a 2001 Grand Prix with a 3.6L V6. Error code 0305- Cyl. # 5 Misfire. I've changed the spark plugs, and wires. That didn't help at all. The engine seems to ok untill the RPM gets up to about 4000 rpm then it starts to cut out and the Check Engine light starts to flash. The only code that I've ever seen was the cyl # 5 misfire. After changing the plugs and test driving for a couple of days, I checked the plug for cyl #5 and it dont look any different that cyl #3. I added some fuel injector cleaner into the gas tank thining that it might be an injector broblem. It might take a while before I can see any results from the cleaner.

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  • smurph_72 Sep 30, 2008

    Thanks for solution #1 but this car has a distributorless ignition system, there is no cap and rotor. I've removed the EGR Solenoid to inspect it, it doesn't look too bad. It's black of course but it appears to be in working order. After I re-installed the EGR Valve the symptoms still remain, but now the code has changed from a misfire on Cyl #5 to P0300 (Random/Multiple Cylinder Misfire). I question the EGR but other research has made the Catalytic Converter a prime suspect as well. .... Any other suggestions?

  • smurph_72 Oct 12, 2008

    I did solve my problem! I found that the catalytic converter was plugged. Thats kind of strange that this problem shows up as a cylinder #5 misfire. Thank you all for your help.

  • Anonymous Dec 22, 2008

    I'm getting a 0300 code which is random/multiple cylinder misfire detected. I have 146,000 miles. Changed the spark plugs and wires and still have the problem. Engine gets bogged down/spits & sputters and exhaust fumes seem to be coming in the car. Any suggestions?

  • Anonymous Apr 21, 2009

    car is shaking at idle then it turns off.



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I've got a 2002 Grand Prix GTP 3.8L Supercharged V6, nearly the same motor.
I had the exact same problem, misfire on Cyl. 5 and random/multiple misfire.

I replaced all the wires, plugs, coils, and even the ignition module. My next thought was either fuel or exaust.

Replaced my Cat. with a 2.5" ZZP downpipe, and the car ran alot better, but still had a tiny bit of hesitation over 4000rpms.

So i checked all the fuel injectors, and the #5 injector was bad.

To check, get an ohm meter, remove the injector connectors, and contact the 2 posts inside the injector. They should read between 12.4-14 or so.

Mine was at 11.2.

Replaced all the fuel injectors, and she runs like a champ

Posted on Apr 28, 2009

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Here is a copy of the "Policy Adjustment" that I took to the dealer with me this morning. Hope this helps any of you.

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Subject: Special Policy Adjustment - Catalytic Converter #05551 -(09/14/2005)
Models: 2001-02 CHEVROLET IMPALA, MONTE CARLO
2001-02 PONTIAC GRAND PRIX
2001-02 BUICK REGAL
EQUIPPED WITH 3.4L (RPO LA1 - VIN E) OR 3.8L (RPO L36 - VIN K) V6 ENGINE
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Condition
Some customers of 2001-02 Chevrolet Impala, Monte Carlo; Pontiac Grand Prix; and Buick Regal model vehicles, equipped with a 3.4L (RPO LA1 - VIN E) or 3.8L (RPO L36 - VIN K) V6 engine, may experience a condition where the vehicle exhaust catalytic converter is replaced due to complaints of lack of power or illumination of the Malfunction Indicator Lamp (MIL). This may be due to the front endcone insulation from the catalytic converter breaking away and blocking the front of the first catalyst brick and preventing the free flow of exhaust gas through the converter.
Special Policy Adjustment
This special policy covers the condition described above for a period of 10 years or 120,000 miles (190,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. The repairs will be made at no charge to the customer.
For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after September 15, 2005 are covered by this special policy and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to September 15, 2005 must be submitted to the Service Contract provider.
Vehicles Involved
Involved are all 2001-02 Chevrolet Impala, Monte Carlo; Pontiac Grand Prix; Buick Regal model vehicles, equipped with a 3.4L (RPO LA1 - VIN E) or 3.8L (RPO L36 - VIN K) V6 engine and built within the following VIN breakpoints:
Year
Division
Model
From
Through
2201
Chevrolet
Impala
19100001
19378250
2001
Chevrolet
Monte Carlo
19100001
19378233
2001
Pontiac
Grand Prix
1F100004
1F275188
2001
Buick
Regal
11100004
11338085
2002
Chevrolet
Impala
29100001
29374833
2002
Chevrolet
Monte Carlo
29100016
29374832
2002
Pontiac
Grand Prix
2F100019
2F276927
2002
Buick
Regal
21100001
21288762
Parts Information
Parts required to complete this special policy are to be obtained from General Motors Service Parts Operations (GMSPO).
Part Number
Description
Qty/ Vehicle
10343187
Converter, Catalytic (L36 engine)
1
10343185
Converter, Catalytic (LA1 engine)
1
10328740
Gasket, Catalytic Converter (Converter to I-Pipe, both)
1
15286606
Gasket, Exh Manif Pipe (L36)
1
24505057
Gasket, Exh Manif Pip (LA1)
1
Customer Notification
General Motors will notify customers of this special policy on their vehicles (see copy of typical customer letter included with this bulletin - actual divisional letter may vary slightly).
Service Procedure
Catalytic Converter Inspection
Begin the inspection by reviewing the condition described by the customer. Refer to "Description and Operation," SI document 657895, to help you determine the correct symptom diagnostic procedure when a malfunction exists.

Posted on Feb 08, 2009

  • afreey Feb 08, 2009

    these motors do not have rotor cap and button. The missfire is the back pressure being forced by the weakest cylinders rings.

    to say that if it is cyl. 3 or 4 or 5 it will show misfire at that cyl.

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Check the cap and rotor - if the contact point for cylinder number 5 is worn or corroded, or the edge of the rotor is smooth, you need to change them (the rotor's edge should look like the edge of a quarter, with ridges). If the contact point on the cap is worn out, it won't fire the plug.

There's a chance that the fuel injector for that cylinder isn't firing, so that would be something to look at if the electrical work doesn't fix the problem, but it sounds as if it's more of a problem with the electrical parts than a fuel injector.

Posted on Sep 28, 2008

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