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Pontiac engine repair questions and answers

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  • lukas.mulkey
    lukas.mulkey - 1994 Pontiac Grand Am - Engine - 5/25/2015
    Why is my car over heating??
    When i drive my car, within 5 minutes my car temperature is in the red and climbing. I have replaced the thermostat, radiator, water pump, head gasket,valve cover gasket and the problem still persists
     
    • Jimm
      5/25/2015 Jimm
      Loss of coolant because of a coolant leak is probably the most common cause of engine overheating. Possible leak points include hoses, the radiator, heater core, water pump, thermostat housing, head gasket, freeze plugs, automatic transmission oil cooler, cylinder head(s) and block.

      Make a careful visual inspection of the entire cooling system, and then PRESSURE TEST the cooling system and radiator cap. A pressure test will reveal internal leaks such as seepage past the head gasket as well as cracks in the head or block. A good system should hold 12 to 15 psi for 15 minutes or more with no loss in pressure. If it leaks pressure, there is an internal coolant leak (most likely a bad head gasket but possibly also a cracked cylinder or engine block).

      It is important to pressure test the radiator cap, too, because a weak cap (or one with too low a pressure rating.

      1. Perform a cooling system / radiator pressure test when the engine is cold - as a first step to locate the leak.
      Obtain a loaner tool / free radiator pressure tester from the local auto parts stores such as Autozone, O'Reilly, NAPA, Advance Auto, or PepBoys. Follow their instructions and pump it to an adequate air pressure 12 -15 psi or the pressure rating listed on the radiator or reservoir cap. Observe the leaks and perform the repair.
      Note: do not over pressurize beyond the pressure allowed by the radiator cap, then test the radiator cap as well.

      2. Air pockets trapped in the cooling system can cause the engine to overheat. Some cooling systems have air bleed valves built into the system to aid in the removal of air pockets. Advice: For many cooling systems, the method of removing air pockets is to start the engine and allow it to run with the radiator cap off or loose until all the air escapes from the neck of the radiator. For some systems this method is not sufficient, and the manufacturer has installed air bleed valves usually near or on the thermostat housing.
  • Richard
    Richard - 2008 Pontiac G8 - Engine - 5/24/2015
    What would cause oil pressure to drop when idling? How difficult is it to replace the oil pump?
    Oil pressure is 40 to 50 lbs while driving and drops to 10 to 15 lbs idling.
     
    • Michael Butler
      5/16/2015 Michael Butler
      It's pretty difficult if you don't have a hydraulic life but if the oil pump is worn then most likely the internal parts are to so it's probably not worth the trouble. How many miles
      Michael Butler
      5/17/2015 Richard
      174,000... are you saying the it may not be the oil pump and replacing it will not help?
    • Michael Butler
      5/17/2015 Michael Butler
      No I'm saying that if the oil pump is bad then I wouldn't go through the trouble of replacing it be internal parts are most likely bad to, when the oil pressure drops on the gauge does the engine act up or stall, it mite be just a bad oil pressure switch
      Michael Butler
      5/17/2015 Richard
      it still runs smooth idling with a little lifter noise. Oil pressure switch was replaced. I have also installed a separate oil pressure gauge to monitor the pressure. I drove it this morning and the pressure dropped to 15 lbs, After it warmed up the idle pressure maintained at 20 to 25 lbs. it has new oil and filter as well.
    • Michael Butler
      5/17/2015 Michael Butler
      What weight are you using
      Michael Butler
      5/17/2015 Richard
      20-50
    • Michael Butler
      5/17/2015 Michael Butler
      I think your oil I to thick, if the oil pressure goes from 40 /50 cold then drops to 20/25 psi I would say your oil is to thick and it's not thin enough to get into the lifters and into the crankshaft bearings causing a noise until it warms up and gets thinner. I would try 10W 30 with some Marvel Mystery Oil additive and see what happens
      Michael Butler
      5/18/2015 Richard
      At this point I am willing to try it. Thanks, I will keep you posted.
      Michael Butler
      5/18/2015 Richard
      I spoke with the dealer where i have the oil changed and they put 10-40 in it. I am going to add the mystery oil to this and try this.
    • Michael Butler
      5/18/2015 Michael Butler
      Okay, keep me updated
      Michael Butler
      5/19/2015 Richard
      Hi Michael I really appreciate your advice. I changed the oil and added the mystery oil and drove the car for an hour. After the first 15 minutes the oil pressure stabilized at 25lbs while idling and up to 60lbs driving 60 mph. I will give a few days and then will be changing it to a full synthetic oil. What are you thoughts on this?
    • Michael Butler
      5/19/2015 Michael Butler
      It's great that the oil pressure is stabilizing and as for the synthetic oil that's just more man made oil so in my opinion I would stick with 10W-40 with a bottle of Marvel mystery oil
      Michael Butler
      5/20/2015 Richard
      Will do thanks
      Michael Butler
      5/24/2015 Richard
      I took the car on a short trip today. The oil pressure was very good idling it maintained at 25lbs and driving between 50 and 60lbs.
    • Michael Butler
      5/24/2015 Michael Butler
      I'm very happy for you, it make me happy knowing I can help brighten someone's day I hope everything stays work
  • Denis Beneteau
    Denis Beneteau - 2009 Pontiac G3 Wave - Engine - 5/20/2015
    Noise under my car sounds like a muffler disconnect but noisy only after 50km an hour+ is it the muffler?
    the noise under the car only starts after driving 50km an hour and the noise gets louder as the speed of the car increases.
     
    0 answer
  • miguel
    miguel - 2002 Pontiac Firebird - Engine - 5/19/2015
    02 downstream sensor
    2002 Pontiac firebird 3.8 my o2 downstream sensor harness got to close to the exhaust and got burnt.went to the dealer got a new female and male wire harness.on the car I see 4 wires black,blue, orange,yellow, I believe due to it was burnt cant see very well,but ...
     
  • miguel
    miguel - 2002 Pontiac Firebird - Engine - 5/18/2015
    Downstream 02 sensor
    2002 Pontiac firebird 3.8 my o2 downstream sensor harness got to close to the exhaust and got burnt.went to the dealer got a new female and male wire harness.on the car I see 4 wires black,blue, orange,yellow, I believe due to it was burnt cant see very well,but ...
     
    0 answer
  • KYWILD307
    KYWILD307 - 2001 Pontiac Bonneville - Engine - 5/16/2015
    DROVE FINE FOR 90 MILES GOT OFF EXIT ACT LIKE FRONT END WAS COMMING APART
    TURNED IT OFF WENT TO STAET IT UP WOULD NOT EVEN TURN OVER WINDOWS WOULD NOT WORK AND THE SECURITY LIGHT WAS FLICKERING
     
    • Michael Butler
      5/16/2015 Michael Butler
      Well if the security light was flickering then the computer senses someone is try to steal the car and it's in safe mode, you need to go to the dealer with it like it is and let them see it and they'll probably have to either reprogram the key or the whole system depending on what they find
  • Richard
    Richard - 2008 Pontiac G8 - Engine - 5/16/2015
    How difficult is it to replace the oil pump on Pont G8
    I have oil pressure when driving (45 to 50Lbs). When it is idling the pressure drops to 10 to 15 Lbs
     
    0 answer
  • KYWILD307
    KYWILD307 - 2001 Pontiac Bonneville - Engine - 5/16/2015
    DROVE FINE FOR 90 MILES GOT OFF EXIT ACT LIKE FRONT END WAS COMMING APART
    TURNED IT OFF WENT TO STAET IT UP WOULD NOT EVEN TURN OVER WINDOWS WOULD NOT WORK AND THE SECURITY LIGHT WAS FLICKERING
     
    0 answer
  • Charles
    Charles - 2001 Pontiac Grand Prix - Engine - 5/15/2015
    My tachometer and gas gauge suddenly stops working but the gas gauge will start working again and tach won't.
    My tachometer and gas gauge suddenly stops working but the gas gauge will start working again and tach won't until I restart the car. Then it starts to sputter.
     
  • Charles
    Charles - 2001 Pontiac Grand Prix - Engine - 5/11/2015
    Can it be my distributor?
    Once my car warms up while I'm driving my car will stutter and the tachometer will stop working. Also it will sometimes stall out while I'm driving. Could this be the distributor or timing chain?
     
    0 answer
  • Bonnie
    Bonnie - 2009 Pontiac G5 - Engine - 5/11/2015
    What's happening with my car?
    Accidentally left headlights on for 60-90 min. Car wouldn't start tried to jump the battery. ...nothing, click click. 1 hr later jumped again started right up but tire pressure gauge has no readings and per temp gauge 217 degrees although the engine is NOT running hot.
     
    0 answer
  • amanda
    amanda - 2001 Pontiac Grand Am - Engine - 5/7/2015
    My vehicle cranks over slowly.
    I have done a tune up, replaced the air filter, replaced the fuel filter. The battery, starter and alternator checked out perfect. Check engine light is not on. What else could it be?
     
    • jdl
      5/7/2015 jdl
      I'd have to check for voltage drop on the starter circuits. Could engine issue causing it to be hard to turn over? Pull your all your spark plugs and serpentine belt, see if the cranking rpms improve.
  • Diggz2005
    Diggz2005 - 1999 Pontiac Grand Am - Engine - 4/27/2015
    What is the name of the hose/wire just to the right of my oil fill cap on the top of my engine?
    The "L" shaped rubber tube just crumbled and I don't know what I would search for to find a replacement. I believe it sits upon a spark plug, but I'm not sure. Thanks!
     
    0 answer
  • David G Lennertz
    David G Lennertz - 2003 Pontiac Montana - Engine - 4/24/2015
    Low oil pressure warning light
    39,000 miles. Light comes on within quarter mile after cold start. After turning engine off for a few minutes, the light does not come back on after restarting. Only happened twice and about ten days apart.
     
    0 answer
  • gram
    gram - 2005 Pontiac Sunfire - Engine - 4/24/2015
    My car doesn't want to start occasionally. Started about two wks ago, It will start to turn over, but not quite.
    It is happening quite frequently now. Check engine light does not come on. Everything else works. If you unhook positive on battery and wait half hr it starts. Happens whether the engine is warm or cold.
     
    0 answer