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I bought a pontiac sunfire 2000, 2.4 twin cam. Bought housing water pump n now the car is throwing black smoke through muffler. Also when I drive mix firing on low speed. It drives great on high speed.

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  • Cars & Trucks Master
  • 4,536 Answers

U may hav bad rings or valve guides causing oil to git in the combust chamber burn and foul plugs--watch how much oil is used-may not be that bad cause ok goin fast--try usin a 40 weight oil-called heavy duty on the container---giv that vehicle a detailed inspection before goin hiway--55 and no long trips

Posted on Oct 12, 2013

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Posted on Jan 02, 2017

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SOURCE: I have to drive with my high beams on because my low's don't work

Check your bulbs. My car came with the wrong bulbs in place. You need 9007 bulbs. My car - the daytime runners worked until I turned on my headlights. When I turned them off the daytime indicator on the dash would flash. The low beams when on were very dim and the high beam indicator on the dash would be on regardless if the high beams were lit or not. I checked everything until I looked up the proper replacement bulb to find the previous owner had the wrong bulbs in the car. Problem solved.

Posted on Dec 06, 2009

  • 42 Answers

SOURCE: Generic problem for all Pontiac Sunfire Cars

Check the Pink wire for high beams and the Dark Blue wire for low beams. Common locations for wiring problems are behind the headlights, under the battery tray. Check for a corroded wiring harness connector or wires at this location. If the wires or connections are found to be corroded, repair or replace the wire or connector as necessary.

Posted on Jan 06, 2010

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Replaced motor in my sunfire 2001 and now it is overheating


Fans not coming on or you could have a warped head

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The water pump was replaced,thermostat replaced,car spews water from the overflow tube and emptys the water from the engine!


Probably either head gasket blown, or crack in head or block. Have you had the engine hot lately? Look for white smoke out of exhaust that will confirm head gasket or cracked block or head.

May 01, 2010 | 2000 Pontiac Sunfire

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2000 pontiac sunfire coolant pours out from the passenger side only when the car stops not when driving and the car is overheating, i only bought this car 2 days ago and they guy said all that it needed...


Sounds like you bought a complete lemon. Most states have lemon laws where if there are untold problems previous owner must pay to fix or buy vechile back. As for the current problem, hopefully it's just a water pump causing car to overheat. Piece of advice, always take car to a mechanic before buying. Might cost you $40 to do so, but better then paying for unexpected problems.

Feb 09, 2010 | 2000 Pontiac Sunfire

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1997 Sunfire overheating


Did hubby put the thermostat in the right way round? Is the car driving ok no excessive smoke or steam as these cars are famous for the cylinder head gasket going south this would explain no coolant and the overheating? Does the electric fan come on? Look into the dipstick and see if there is any white mixture around it looks like mayo that’s an indication of water in the oil. Fill the radiator up again and let the car idle with the overflow tank cap of this will allow any trapped air to bleed of and help with any vapor lock. Did hubby make sure he scrapped all the old water pump gasket of the block before he put the new gasket and water pump on? If the surface was uneven e.g. old gasket still stuck on the block it would not seal correctly and leak hope this helps

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2000 pontiac sunfire 2.4L twin cam. When put in drive I hear a loud bang and when driving it has a quieter bang when it shifts gears.


Check your motor mounts, it sound like your motor is rocking back and forth. You can confirm this by watching the engine while someone shifts it in and out of gear for you.

Sep 13, 2009 | 2000 Pontiac Sunfire

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Black smoke


black smoke out of exhaust? if so, piston rings or maybe valve or vavle seats. For piston rings, motor needs to be rebuilt. For valves, neads a valve job. Either way, big money.

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Duramax black smoke under meduim load and over heats


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