Question about 1995 Oldsmobile 88

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Engine knocks on lower part of engine. Already did plugs wires and valve cover gaskets. Car owned by little old lady and was dealer serviced its whole life

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If it not a timing problem, (which will have to be checked with a timing light by a mechanic) then it will more than likely be a serious bearing issue, requiring a rebuild or another engine.

Posted on Feb 25, 2012

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I was checking the plugs and when I pulled out the socket it was covered in oil. Is this normal ? I have never really owned a hemi style engine. the engine is a 3.5L 24valve engine.


No it is not normal. It means the valve cover spark plug tube gaskets are starting to leak. Eventually the oil will ruin the wires if it has not done so already. The fix is to replace the valve cover gaskets. It's not a hard job just time consuming. You will need to pull the upper plenum in order to pull the valve covers. It's pretty much nuts and bolts along with a couple of connectors and vacuum hoses. If you need more help or have additional questions let me know and I'll do my best to help you out.

Oct 10, 2011 | 1997 Dodge Intrepid

1 Answer

How do I remove the valve cover in order to service lifters?


This si the solution for a gasket replacement, and you will need it when you remove the old ones.
  • Right Side
    • 1

      Disconnect the negative battery cable. Remove the accessory drive belt. Using a 9/16mm wrench, loosen the power steering pump bolts, then slide the pump forward. Do not remove the power steering pump. Remove the power steering pump braces.

    • 2

      Disconnect the spark plug wires. Using a 9/16 mm wrench, remove the valve cover bolts. Lift the valve cover to remove it. Using a flathead screwdriver, gently nudge and remove the old valve cover gasket.

    • 3

      Clean the gasket seating area using automotive engine cleaner and a clean cloth rag. Make sure that all debris is removed. Place the new gasket into place. Apply gasket sealant and place the valve cover back into place.

    • 4

      Tighten the bolts securing the cover into place using a torque wrench. Reconnect the spark plug wires. Reinstall the power steering pump braces. Place the power steering pump back into position. Using a 9/16 mm wrench tighten the bolts that secured it into place. Reinstall the accessory drive belt.

    Left Side
    • 1

      Ensure that the negative battery cable is disconnected. Locate and remove the accessory drive belt. Using a 9/16 mm wrench, disconnect the bolt attaching the alternator to the brace.

    • 2

      Remove the brace to gain access to the additional parts that will be removed. Disconnect and remove the spark plug wire harness. Using a 9/16 mm wrench, remove the bolts securing the valve cover. Lift up and remove the valve cover.

    • 3

      Use a flathead screwdriver to gently nudge the old valve cover gasket to remove it. Do not scratch the gasket seating area when removing the valve cover gasket. Make sure that all debris and particles are removed from the gasket seating area.

    • 4

      Place the new gasket in the gasket seating area. Using a torque wrench tighten the valve cover gasket bolts. Reinstall the spark plug wire harness. Put the alternator brace back into position and tighten the bolt that secures it into place.

    • 5

      Reinstall the accessory drive belt. Reconnect the negative battery cable. Add oil to the car and start the engine. Allow the engine to run idle for 10 to 15 minutes. Drive the car a short distance to check for leaks.

  • Mar 16, 2011 | 1999 Oldsmobile Silhouette

    1 Answer

    I had 92 honda civiv hatchback, the sparkplugs get wet with engine oil from vave cover, does sparkplugs has its own individual seals?


    The spark plugs, if getting wet from the engine oil dripping off of the valve cover gasket, is not good.
    The boots of the spark plug wires will prevent the contacts from getting oily, but not for long. I would have the valve cover gasket replaced to prevent this from happening. It's not good to get the spark plugs and wires wet with engine oil.

    Nov 25, 2010 | 1992 Honda Accord

    2 Answers

    2002 Passat, 30 valve V6 has oil leaking on exhaust manifold. VW dealer says its the cam adjuster seals. It looks to me like its just the valve cover gaskets but I can't get an engine schematic to see the...


    I have a 2000 Passat V6. They told me that same thing. To replace the gaskets is easy. You just remove the covers and the air filter box and unscrew the 6 bolts holding the valve cover on it and there you go. You want to clean around the gasket service and add a little bit of sealant to the edges. Replace the old gaskets and put everything back together, be careful not to overtighten the bolts, can flatten out the gasket and cause oil leak again. On the right side of the engine, you have to remove the coolant box to get to it. Same procedure....

    Oct 18, 2010 | 2002 Volkswagen Passat

    1 Answer

    Changing pvc valve


    1995 Geo Truck Tracker 4WD 1.6L TBI SOHC 4cyl
    The PCV Valve is located under hood, center, upper engine area, top of engine, mounted in passenger side of intake manifold.

    The low gas mileage and the versatility that your 1995 through 1999 Geo Tracker offers are two benefits of owning it. The maintenance needs to be kept up on your Geo Tracker. One form of this maintenance is to replace the valve cover gasket once you have driven 100,000 miles or more.
    1. Allow your engine to cool. Disconnect the negative battery cable. Remove the air inlet hose and air intake case or air cleaner housing. Detach the PCV valve hose from the PCV valve. Separate and remove the spark plug wires and the accelerator cable from their clips.
    2. Loosen and remove the valve cover bolts. Lift the cover up and off. Using a flathead screwdriver, gently nudge the gasket out of the gasket seating area. Using automotive engine cleaner and a clean cloth rag, clean the gasket seating area.
    3. Place the new gasket in the gasket seating area. Put the cover back into place. Put the bolts in and then using a torque wrench tighten them. Do not over tighten the bolts or the gasket will not fit correctly. Reconnect the spark plug wires and the accelerator cable in the holding clips.
    4. Reconnect the rubber hose to the PCV valve. Install the air intake case, or air cleaner housing, and the air inlet hose. Reconnect the negative battery cable. Add oil to the car and start the engine. Allow the car to run 10 to 15 minutes. This will allow the oil to lubricate the engine while it moves to the top.
    I hope helps with this (remember rated this help) Good luck.

    Dec 29, 2009 | 1995 Geo Tracker

    5 Answers

    Head Gasket?? Valve cover Gasket???


    most likely it is the valve cover gasket. it covers the valve train where there is alot of oil to lube the top of the motor. if the head gasket was leaking it may have more signs of running poorly. also having coolant leaks also. so i will have to say valve cover gasket. now usally you may have a oil burning smell with it depending on the area of the lek but not always.

    the valve cover can easily be seen when the hood is open. it is right on the top and where it meets the clyinder head is where the gasket is and the leak can be seen.

    if you have more question please ask.

    Nov 12, 2009 | 1997 Geo Tracker 2 Door

    2 Answers

    Oil leaking into sparkplug holes on rubber boots


    Buy a new valve cover gasket set (and a small tube of silicon high temp sealer). It comes with new rubber seals for each sparkplug hole, and the cover perimeter.Use a little silicon glue on the gaskets to hold them in place. Take your time,do the work with a cold engine in a shaded area. Clean all the oil off the wires and make sure all the old gasket rubber is cleaned off.And check to make sure before you put the cover back on that no old gasket pieces are in the engine.

    Sep 20, 2009 | 1992 Honda Accord

    1 Answer

    Have a 1999 lexus es300. Getting indications that knock sensors need to be replaced. Car has 144k miles. What do the knock sensors do and how easy / tough to replace?


    If you have some common tools the knock sensors are no big deal.  If you take a lexus they will make is sound like you need to completely disassemble the engine and scare you off.
    First, do you really have a problem with preignition causing real knocking due to carbon buildup, or diluted gasoline or do you have failed knock sensor(s).  Try to decarbon the engine first.
    There is a technique used with water being sprayed into a warm engine intake.  This will clean up the valves and carbon buildup which can result in engine knocking.  

    The job will be a couple hundred for the parts and a couple hours of your time.  After you are done, you have entitled yourself to approximately $500 in new tools for your tool chest since this is what Toyota and Lexus will charge to fix (about $1k+).

    You will need to buy the following to address the knock sensors and a couple other items while you're in the neighborhood.
    - 1x upper intake plenum gaskets - 2x lower intake plenum gasket - coolant bypass hose found in the same area as knock sensors - 2x knock sensors (bank1 and bank2) - short pig tail cable which connects both knock sensors to common wire harness. - toyota antifreeze  (2 gallons, if i remember correctly... when mixed to 50/50 (antifreeze/ water) you will have 4 gallons.
    drain the radiator drain the front of the engine using the engine drain plug - this plug is on the front right side facing the engine, behind the right hand exhaust manifold. (this will lower antifreeze enough to avoid dumping antifreeze all over the engine later) remove the air filter box remove the connections into the throttle body remove the cable from the throttle control remove the upper air intake plenum remove the two lower air intake plenums remove the antifreeze fill port
    Knock sensors will be in the valley between the lower intake plenums.  You will need to remove the rubber antifreeze bypass hose (little short hose blocking access to the knock sensors).
    By the way, the reason you bought a replacement, is that if this short hose splits from normal wear, you need to spend this money and effort to reach it, so just do it now.
    The little pig tail cable which connects both knock sensors to the wire harness is said to cause a big majority of the problem due to the plastic getting hot and brittle, falling off and shorting to the engine.  While in this mode the engine thinks knock is occuring and starts to retune the air fuel mixture to get rid of the knock until it goes into minimal operations mode.
    After replacing the knock sensors (and tighten to torque specs), replacing pig tail cable, and reinstalling your new short by pass hose.  Replace the lower gaskets, antifreeze fill port, lower intakes, upper gasket, upper intake, air intake, air filter, reattach everything, reconnect all the rubber lines you pulled off, make sure there are no splits in the air intake passage anywhere, retighten the engine antifreeze drain plug, and the drain on the bottom of your radiator, and your done!
    Don't forget the easy stuff.  Dilute the antifreeze with water and fill the radiator and overflow tub.  Run the engine for several minutes until its hot and opens the thermistat to allow antifreeze into the empty engine cavities.  Turn the engine off and get a cold one as the engine cools.  Once absolutely sure engine is cold, refill the radiator with antifreeze and refill the reserve tub.  Do this at until all the beer is gone and you are both full of antifreeze (in one form or another)..... obviously red stuff in the car, amber down the gut.

    Jul 27, 2008 | 1998 Lexus ES 300

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