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Pontiac transmissions & drivetrains repair questions and answers

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  • kentconn1
    kentconn1 - 2002 Pontiac Grand Prix - Transmissions & Drivetrains - 7/5/2013
    Why would my car get louder when it goes faster?
    its quiet at idle but as i gain speed it gets loud was told its the hub bearings? also told pin hole in muffler? not sure if its the exhaust getting louder ,engine or what is getting louder
     
    • Jason
      7/5/2013 Jason
      What type of sound is it, where is it coming from, and when does it happen? Are we talking engine speed or vehicle speed? I am assuming the car has to be moving, but you did not state that.
      Jason
      7/5/2013 kentconn1
      vehicle speed as speed increases it gradually gets louder from inside the car it sounds like exhaust sound but i cant really tell for sure
  • kentconn1
    kentconn1 - 2002 Pontiac Grand Prix - Transmissions & Drivetrains - 7/4/2013
    My car idles quietly but gets louder the faster i go
    was told its the front hub bearings could this be true? any other possibilites? was also told could be pin hole in muffler?
     
    • Jimm
      7/4/2013 Jimm
      Need more information and details - what gets louder, the engine noise? The wheels or tire nosise? The exhaust noise? Can you please add detail; such as what changes louder or noisier? What conditions does the noise change - engine speed? Vehicle speed?
      Jimm
      7/4/2013 kentconn1
      sounds like its exhaust noise gets loud over 40 mph
      Jimm
      7/4/2013 kentconn1
      i suppose it could be engine noise?
      Jimm
      7/4/2013 kentconn1
      not really a noise i guess just louder
  • janeb1964
    janeb1964 - 2002 Pontiac Grand Prix - Transmissions & Drivetrains - 7/2/2013
    Car starts and runs. can not shift vehicle into any gear.
     
    • HouseCallAuto
      7/2/2013 HouseCallAuto
      So you are saying that you cannot remove the shifter from park? Your details are not clear. "can not shift vehicle into any gear" has more than one meaning.
      HouseCallAuto
      7/2/2013 janeb1964
      yes. the shifter won't budge.i squeeze the button and pull on shifter and it does not move. i do hear a clicking sound.
    • HouseCallAuto
      7/2/2013 HouseCallAuto
      1. Verify there is a good ground on the Orange/Black wire at the shift lock actuator.

      2. Check for power on the dark Green/White wire with the key on until the brake pedal is depressed.

      3. Check the Pink wire for power anytime the key is on.

      4. This wiring is under the console shifter.
      HouseCallAuto
      7/4/2013 janeb1964
      thank you. it was just a broken wire.
  • rdwilkinson
    rdwilkinson - 1996 Pontiac Firebird - Transmissions & Drivetrains - 6/15/2013
    Why does car shudder when engaging firs gear?
    Seems to be heat related. This is not a problem when first using the car. But as it heats up, trying to start from first the car needs excessive rpms to go. This does not occur in any other gear. In fact can start from second gear and does not happen. Also is my ...
     
    0 answer
  • Tiffany_Schaeffer23
    Tiffany_Schaeffer23 - 1999 Pontiac Grand Am - Transmissions & Drivetrains - 5/18/2013
    How do you know if the transmission has the correct amount of fluid?
    My automatic transmission doesn't have a dipstick to check that way so I want to know how to check the level, and make sure wether or not it has enough fluid.
     
    • HouseCallAuto
      5/18/2013 HouseCallAuto
      Car has to be on a lift and sight plug removed from side of trans case. Fluid level shopul be at level of bottom of threads of hole
      HouseCallAuto
      what if I don't have access to a lift? is there any other way to check it without putting the car onto a lift?
      HouseCallAuto
      5/19/2013 HouseCallAuto
      yes if you can get underneath it while keeping the car level as though it were on a lift. That would mean putting on ramps in the front and then jacking up the rear until it is level. Can you do that...safely?
  • Adam F
    Adam F - 2008 Pontiac G6 - Transmissions & Drivetrains - 5/17/2013
    Why does my car "jump" when I go from 35mph to 45mph?
    During traffic conditions (ie not going from 0 to 45mph) my car will "stutter" or hesitate any where from 1 to 4 times before it smoothes out. No noise is occuring it just jolts the car and feels like it has trouble getting up to speed. Also when I am fully ...
     
    0 answer
  • edithdavis77
    edithdavis77 - 1988 Pontiac 6000 - Transmissions & Drivetrains - 5/3/2013
    Why does the engine knock when I step on the gas?
    The car runs fine. It occurs each time I start the car and hit the accelerator.
     
    • Jimm
      5/3/2013 Jimm
      First step - check the engine oil level and refill as necessary. if the engine knock is related to fuel / spark knock - then here are some possibilities;

      Spark knock (detonation) is an erratic form of combustion that occurs when multiple flame fronts occur simultaneously inside a combustion chamber. Detonation occurs because fuel is subjected to either too much pressure, too much heat or both. It usually happens during acceleration when the engine is heavily loaded and cylinder pressures are at their peak.

      Instead of a single flame front growing outward smoothly like an expanding balloon from the point of ignition, multiple flame fronts are generated spontaneously throughout the combustion chamber as the fuel automatically ignites from heat and pressure. The multiple flame fronts collide, creating shock waves that produce a sharp metallic pinging or knocking noise.

      Mild detonation can occur in almost any engine and will not cause damage. Prolonged heavy detonation can crack pistons and rings, blow out head gaskets, damage spark plugs and valves, and flatten rod bearings.

      Any of the following can cause detonation:

      Too Much Compression: An accumulation of carbon deposits in the combustion chambers, on piston tops and valves can increase compression to the point where it exceeds fuel octane rating. If a top cleaner fuel additive fails to remove deposits, a new alternative is to blast the deposits loose by blowing crushed walnut shells through the spark plug hole. Otherwise, the head will have to be removed so the deposits can be scraped off.
      Overadvanced Ignition Timing: Too much spark advance causes cylinder pressure to rise too rapidly. If resetting the timing to stock specifications does not help, retarding timing a couple of degrees may be necessary to eliminate knock.
      Engine Overheating: A hot engine is more likely to suffer spark knock than one which runs at normal temperature. Overheating can be caused by low coolant, a defective fan clutch, too hot a thermostat, a bad water pump, etc. A buildup of lime and rust deposits in the head and block can also reduce heat transfer

      Overheated Air: The thermostatically controlled air cleaner provides the carburetor with hot air to aid fuel vaporization during engine warm-up. If the air control door sticks shut so that the carburetor continues to receive heated air after the engine is warm, detonation may occur, especially during hot weather. Check the operation of the air flow control door in the air cleaner to see that it opens as the engine warms up. No movement may mean a loose vacuum hose or a defective vacuum motor or thermostat.

      Lean Fuel Mixture: Rich fuel mixtures resist detonation while lean ones do not. Air leaks in vacuum lines, intake manifold gaskets, carburetor gaskets or fuel injection intake plumbing downstream of the throttle can all admit extra air into the engine and lean out the fuel mixture. Lean mixtures can also be caused by dirty fuel injectors, carburetor jets clogged with fuel deposits or dirt, a restricted fuel filter, or a weak fuel pump.

      The air/fuel ratio can also be affected by changes in altitude. A carburetor calibrated for high altitude driving will run too lean if driven at a lower elevation. Altitude changes are generally compensated for on computer cars by the barometric pressure sensor.

      A lean fuel condition can be diagnosed by watching for lean misfire on an ignition scope, or by using a four-gas infrared analyzer and watching exhaust oxygen levels. A reading over about 3% to 4% oxygen would indicate a lean fuel condition.

      Spark Plug Too Hot: The wrong heat range plug can cause detonation as well as pre-ignition. Copper core plugs are less likely to cause detonation than standard spark plugs.

      Loss of Exhaust Gas Recirculation (EGR): EGR keeps combustion temperatures down, reducing the tendency to detonate. If the EGR valve is inoperative or someone has disconnected or plugged its vacuum hose, higher combustion temperatures can cause pinging.

      Low Octane Fuel: Burning cheap gas may be one way to save pennies, but switching to a higher grade of fuel may be necessary to eliminate a persistent knock problem.

      Defective Knock Sensor: The knock sensor responds to frequency vibrations produced by detonation (typically 6 - 8 kHz), and signals the computer to momentarily retard ignition timing until detonation stops. A knock sensor can usually be tested by rapping a wrench on the manifold near the sensor (never hit the sensor itself). If there is no timing retard, the sensor may be defective.



  • www.robertmiles461
    www.robertmiles461 - 1999 Pontiac Grand Am - Transmissions & Drivetrains - 4/30/2013
    Just pull engine in last week.now when put in gear i have noise in it
     
    0 answer
  • ostermw
    ostermw - 2002 Pontiac Grand Am - Transmissions & Drivetrains - 4/12/2013
    While driving forward there is a noticable noice but when driving in reverse the noise will increase.
    The noice is only noticable while driving. the check engine light will start blinking and stay on.
     
    • k+dtrans+auto
      4/12/2013 k+dtrans+auto
      have it scanned for codes, address those first and see if problem is taken care of.
  • Michael
    Michael - 1998 Pontiac Grand Prix - Transmissions & Drivetrains - 4/2/2013
    What could be wrong when my cruise control doesn't work?
    I have checked all of the fuses and all of the other functions work with my turn signal switch. It has 125K miles now. I bought it when it had 100K and it didn't work then. Thanks, Michael
     
    0 answer
  • fatkidd84
    fatkidd84 - 1994 Pontiac Grand Am - Transmissions & Drivetrains - 3/23/2013
    When very hard on the gas pedal hits the rev limite and will not shift until slightly released why??
    On 94 Grand Am quad for motor 62,000 miles 2 guys at work think is a misfire. The transmission shift smoothly and strong . The fluid may or may not be original I do not know. I have done of full tune up it has new plugs boots cap and coils. Also has a new fuel line ...
     
    0 answer
  • coryb1384
     
    0 answer
  • josephgonzales_az
    josephgonzales_az - 2007 Pontiac G6 - Transmissions & Drivetrains - 3/23/2013
    My speedometer shows that i am going faster then i am
     
    0 answer
  • martinsowe
    martinsowe - 2003 Pontiac Aztek - Transmissions & Drivetrains - 3/8/2013
    I changed the top cylinder gasket on my car put It back together, the engine runs good but the gears will not engage
    The tranmission fluid was emptied but refilled again and when I started the engine and try to shift the gear IT MOVES to different positions but do not engage.
     
    0 answer
  • martinsowe
    martinsowe - 2003 Pontiac Aztek - Transmissions & Drivetrains - 3/8/2013
    I changed the top cylinder gasket on my car put It back together, the engine runs good but the gears will not engage
    The tranmission fluid was emptied but refilled again and when I started the engine and try to shift the gear IT MOVES to different positions but do not engage.
     
    0 answer