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2.2 pontiac sunfire backfires thru intake

Fual pump sounds like it's working

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The timing

Posted on Feb 12, 2012

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I am getting fuel from the fuel pump through the filter and up to the intake but it still isn't getting fuel out of the injectors


take them out stick them in some seaform for 24 hours put them back on the fual rail but not in the intake turn the key and see if they spray if they dont trashs them buy new they are cheap

Jan 28, 2013 | Cars & Trucks

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2001 pontiac sunfire hard cold start


Could be a faulty idle air control valve. The computer controls idle speed by how much air gets into the intake thru the valve.
I am assuming the check engine light is not on.

Dec 19, 2012 | 2001 Pontiac Sunfire

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2000 pontiac sunfire replaced head gasket now it still wont start, it just backfires


It sounds like a timing issue. Make sure the cam shafts and timing belt are installed correctly. Hopefully you have not belt any valves while trying to start it. Good luck.

Apr 21, 2012 | 2001 Pontiac Sunfire

1 Answer

Pontiac sunfire overheating


hello! I had the same problem with my 2000 Pontiac Sunfire... there might be one of these 2 problems with it.... maybe the Heater Core is jammed and the coolant dosen't flow thru the engine to cool it off, or the water pump is defective.... does the heating works or not? if yes, the water pump is defect, if not, the heater core is jammed, try a ''radiator hose cleaner'' (sold in Napa's or Carquest..) it will act as a kind of ''decloaker''.. if works, good! 15$ solution... if not, replace Heater Core... ~150$

Jan 09, 2012 | 2000 Pontiac Sunfire

1 Answer

I have a 2000 pontiac sunfire. I can hear the blower run and change speeds when I turn the nob, but barely any air comes out of the vents. I have removed the blower and checked that. The ducts are clean...


It sounds like vacuum is not getting to the vent, heat and A/C controls. Find the vacuum can. It may be under the hood on one of the inner fenders. The "one-way" check valve is usually located in the line and close to the can, make sure it works properly. The valve could be the very thing that's causing the problem. Trace the lines back to the vacuum block at the intake manifold or fire-wall, and also back to where the line goes thru the fire-wall. Check the can for leaks or obvious holes. They used to be just a plain metal can, but it could be a plastic ball. Check the lines as you go, for breaks and rub-thru's. Move the controls thru all settings and listen for vent door movement. Worst case is a bad vacuum motor or air flow position selector switch, and/or a faulty Blend Door Actuator. If you have been driving around with the Temperature knob or control set at the same spot for months, move it from fully cold to fully hot several times and wait for the air temperature to change each time. This will help reset the blend door and vacuum control system. Hope this helps... Let me know what you find.

Aug 25, 2011 | 2000 Pontiac Sunfire

1 Answer

Where is the fuel pump shut off switch located in a 2000 pontiac sunfire


GM doesn't use a fuel pump shut off switch, the safety system works like this, fuel pump is turned off if the engine oil pressure goes to zero with the key in the run position. Ford uses a shut off switch that is activated by an impact exceeding 3 G's (3X the force of gravity), it is called the fuel pump shut off inertia switch.

Aug 24, 2011 | 2000 Pontiac Sunfire

1 Answer

So my 2000 Pontiac Sunfire has an issue with the power steering. I'm not sure if its a belt, the pullly or barrings in the pully, or if its the actual pump. It has fluid and everything. But you can...


Firs check the belt tension, you should have about 1/4 of an inch free play in the belt, that is up and down movement of the belt, also check the fluid level.
Is there any noises from the powersteering pump, like a bubbling noise or a whirring noise?

Jul 25, 2011 | 2000 Pontiac Sunfire

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