Question about 1999 Pontiac Firebird

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1999 3.8L V6 Firebird - Cyl 6 misfire, stalls at idle, hard start

I'm getting trouble code 172, 175 and 306. Fuel mixture too rich, right bank and cyl 6 misfire. The car is hard to start, blue smoke pours out of tail pipe during start, car idles rough and stalls when I slow to a stop. The stall is coincides with a drop in voltage (goes from a nominal 14.4 to 8 volts.) Battery and alternator test good (both are < one year old.) Fuel filter and pump are brand new. A mechanic told me the catalytic converter was bad, so I had it replaced...no change in the above symptoms. The problem has gotten progressively worse over the past year with the stalls happening more frequently, but this is the first time these trouble codes had surfaced. I was orignally getting code 440 - EVAP malufunction, but haven't seen that code in three months. Any ideas? Could it be the injector?

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Look at spark plug 6 see if it is foul out with oil. when you first start you car up and it smokes blue you have leaking valve seals and stop up oil return holes.if all is good .check 6 injector make sure its getting power.

Posted on May 16, 2009

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Posted on Jan 02, 2017

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Trouble code PO172


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Code: P0306, Cylinder 6 misfire detected. Probable cause: rich/lean air fuel mixture, ignition system fault, fuel injector fault, engine mechanical fault. Also, code: P0431, Catalyst efficiency below...


The most probable cause of misfire on every gas powered vehicle is a worn spark plug.

Next in line to that is the spark plug wiring, followed by ignition coil.

Even if the plug is NOT worn, inspecting them will tell you the story of how the engine is operating.

Replace all of your spark plugs. The old plug from bank six will look different from the rest and will most likely smell like fuel also.

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Smoke coming from exhaust when i start my truck


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If you have just a bit more of smoke than usual do a code scanning to check if mixture is rich or lean or if there is misfire or other problem that can affect the engine.

Dark thick smoke is symptom of unburned fuel or oil getting into the cylinder. The smoke can be the result of rich mixture, piston ring problems, valve problems, ring problems or misfire. EGR and PCV system problems also result in smoke from exhaust.

If smoke is only at start and it is dark gray it is probably because of incorrect mixture resulting from another problem.

If problem is piston rings or valves the smoke will be black, thick and smelly because oil gets burned in cylinders. The smoke in this case is not only at start.

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Thick white smoke is instead symptom of water (or coolant) getting into the cylinder. Check if the coolant fluid level is going down by itself. Look for traces of fuel in coolant reservoir. Do a compression test to find out if there is head gasket leakage inside the engine.

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What would cause smoke to come out the exhaust pipe


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Whats going on here is that you have a too rich fuel air mixture. This will cause your misfiring and set off the PO172 Code. Your Bank 1 O2 Sensor is picking up the too rich mixture. This O2 sensor is location on the #1 Cylinder side (so you problem could be in #1/#3/#5 Cylinder). A dirty MAF Sensor, loose plug wire, dirty/broken spark plug, dirty fuel injectors, vacuum leak, and PCV Valve could all be a cause. I would run some injector cleaner through and also clean the MAF Sensor, change your PCV Valve. This would be an easy and cheap start for you. Good luck and thanks for using FixYa!

Sincerely,
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