Question about 2002 Pontiac Grand Am

1 Answer

Misfire, 2002 3.4 l, V-6, Grand Am, only after sitting out in sun

Hot weather with direct sunlight on this black Grand Am will cause a significant misfire. It has done this off and on for years, but only once or twice a year. Back then the service engine light stayed on and it always self-corrected with a little driving and then restarting engine. Now, service engine light flashes, (not good), engine runs rough and only returns to normal after hours of cooling down in the shade or over night. Stays fine, runs normal for weeks, until it sits out all day in very hot weather, especially if the hood is facing the sun. I strongly suspect a sensor malfunction. Registers OBD code PO206 and PO306 indicate injector circuit and misfire # 6 cylinder. Another time, same symptom, O2 sensor code PO132 was registered. What should I look for? Both O2 sensors have been replaced within the last year, less than 5000 miles ago as part of regular maintanence.

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.


    An expert that has over 500 points.

  • Expert
  • 366 Answers

I would check wiring at injector 6 for a bad contact if ok test injector

Posted on Jun 23, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

The dash where the time and temperature are the clock works but the temp stays on 7 degrees even though it is 30 degrees outside and car was in the sun.

The external temperature probe is usually located behind a fender/bumper to keep it out of the air flow for a more accurate measurement, that is why the temperature drops after starting off as it sits in a pocket of warm air. It is not in direct sunlight so that shouldn't have harmed it.

Dec 13, 2015 | Cars & Trucks

1 Answer

Why does Power Steering fail when stopped in hot weather?

How do you know it has failed & how so?

Hot weather should not be an issue,cold weather maybe

Aug 12, 2014 | 2002 Jeep Grand Cherokee

1 Answer

Buick rendezvous misfire issue

Since you changed parts, you have covered some possibilities. On the spark side, the Crankshaft sensor and( if equipped) the camshaft sensors give the information for the firing Pulse.

A wet connection on either part can certainly cause a misfire. There is also the possibility of a fuel injector misfiring due to a connection or bad ground on the injector during damp weather.

Sometimes if you get lucky you can see spark jumping on the motor by operating the engine in the dark. Mist the engine with a spray bottle of water to see if you can induce a misfire, if unsuccessful with normal weather conditions.

WD 40 often cures moisture problems.

Please rate my info.

Jan 29, 2013 | 2002 Buick Rendezvous

1 Answer

2005 mitsubishi lancer dies in hot weather

Well my friend, sounds like to me, you need a new battery and it wouldn't hurt to get a new car. Thank you for submitting your problem.

Jul 30, 2012 | 2005 Mitsubishi Lancer

1 Answer

04 Grand AM trouble starting in the sun.

I had a Honda Civic that did the same thing, I replaced the multi-relay (which has the computer power relay and fuel pump relay in it) in the car and it never did it again. Your car should have a seperate fuel pump relay, in the black box under the hood. You might also want to have the control module tested after the car sits out in the sun and won't start. Auto Zone can test them. I would also check for fuel at the test fitting on the fuel rail when it won't start. It maybe the relay.

May 30, 2010 | 2004 Pontiac Grand Am

1 Answer

What would cause a cylinder 5 misfire in my 2002 jeep grand cherokee 4.7L

04jeeplibertypo305changedinj coil plug counters stayed high for #5 saw spikes on other cyls changed chk sensor no spikes on any misfire counter a week later back with a po 305 ?

May 14, 2010 | 2002 Jeep Grand Cherokee

1 Answer

2005 corolla rear window makes a sound

check the weather stripping, if its worn or broken, usually caused by heat or direct sunlight hardening the rubber and causing it to crack, the average cost of replacing this is around 75-100 bucks, hope this helps

Mar 07, 2010 | 2005 Toyota Corolla

1 Answer

2002 escape liftgate

There was a recall on some rear windows. You might want to check with the dealer on this.

Jun 09, 2009 | 2002 Ford Escape

1 Answer

Sun visors

I just fixed this same problem on my 1993 Toyota Camry.

First, I tried velcro, but in the hot weather the glue wouldn't hold to the fabric so the fix only lasted about 6 months.

Just now I gerryrigged a black office paper clip - the big kind with the black clip attached to two big silver metal hands - to the visor and metal arm.

Magic, it's fixed, and for free.

Aug 16, 2008 | 1993 Cadillac Allante

Not finding what you are looking for?
Cars & Trucks Logo

436 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pontiac Experts


Level 3 Expert

81423 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22359 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8841 Answers

Are you a Pontiac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides