ALSO WHEN PUTTING BOLTS ON A HEAD GASKET YOU DO NOT TIGHTEN THE BOLTS TIGHT .yOU WILL WARP THE METAL HOUSING IF YOU PUT THE BOLTS TIGHT.PUT THE BOLTS ON SNUG(JUST TO WHERE THEY ARE SEMI-TIGHT . CHECK TO SEE IN A DAY IF THEY ARE LEAKING IF SO TIGHTEN A LITTLE MORE WHERE THEY ARE LEAKING ONLYALSO WHEN PUTTING BOLTS ON A HEAD GASKET YOU DO NOT TIGHTEN THE BOLTS TIGHT .yOU WILL WARP THE METAL HOUSING IF YOU PUT THE BOLTS TIGHT.PUT THE BOLTS ON SNUG(JUST TO WHERE THEY ARE SEMI-TIGHT . CHECK TO SEE IN A DAY IF THEY ARE LEAKING IF SO TIGHTEN A LITTLE MORE WHERE THEY ARE LEAKING ONLY
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Valve cover bolts for a 1988 Oldsmobile 98 Regency Brougham can be obtained from several sources:
Auto parts stores: Many auto parts stores such as Advance Auto Parts, Autozone and O'Reilly Auto Parts carry a wide range of replacement parts for older vehicles, including valve cover bolts.
Online retailers: Websites such as Amazon, RockAuto and CarParts.com carry a wide range of replacement parts for older vehicles, including valve cover bolts.
Oldsmobile specialty stores: Some specialty stores that focus on Oldsmobile cars carry a wide range of replacement parts for older vehicles, including valve cover bolts
Junk yards or salvage yards: You can find used valve cover bolts at the junk yards, but be aware that they may not be in good condition, and they may not have the correct bolts.
Manufacturer: You can also try contacting Oldsmobile directly or the manufacturer of the engine to see if they still carry the parts or can provide you with a supplier
Unplug the computer and sensors on the plenum and throttle body. Remove the computer. remove the computer bracket. remove the bolts on the side of the plenum. the ones by the fire wall can be a pain. Pull out the plenum. remove the plugs from the coils. remove the coils. remove the bolts for the valve cover and replace the seal. install in reverse order.
If you didn't correctly reinstall the PCV hose from the black box at the throttle body back on to the valve cover, you might have a vacuum leak causing your high idle. I'd check that first. That is a common mistake to miss that rubber hose. It's hidden underneath the black box at the front of the valve cover. If it is loose, just loosen up the boot at the throttle body, and the two bolts on the right side of the black box above the valve cover. Reposition the 90 rubber hose back on to the valve cover and recheck it. A hissing noise with the engine running is a good indication that the engine has a vacuum leak somewhere- usually a rubber hose disconnected from the intake manifold or throttle body.
If the manifold was replaced, install or connect the following:
Vacuum source manifold.
Positive Crankcase Ventilation (PCV) valve.
Manifold Absolute Pressure (MAP) sensor.
Throttle body assembly.
Upper-to-lower intake manifold carrier gasket to the upper intake manifold.
Carefully place the upper intake manifold onto the lower intake manifold. Ensure that the alignment pins in the upper intake manifold align with the holes in the lower intake manifold.
NOTE: Apply thread lock compound, to the bolt threads before assembly.
Install or connect the following:
Upper intake manifold. Tighten the upper intake manifold bolts in sequence to 89 in lbs (10 Nm)
Accelerator and the cruise control cables with the bracket to the throttle body.
EVAP purge solenoid vacuum line to the throttle body.
Connect the electrical connectors to the following:
Mass Air Flow (MAF) sensor
Manifold Absolute Pressure (MAP) sensor
Idle Air Control (IAC) valve
Throttle Position (T/P) sensor
EVAP purge solenoid
Install or connect the following:
Throttle body upper support bracket bolt. Tighten the bolt to 89 in lbs (10 Nm)
EGR valve wiring harness heat shield, nut and the bolt. Tighten the nut and the bolt to 89 in lbs (10 Nm)
Sometimes an exuast leak when a motor is cold sounds like a tapping noise or it could just be a simple rocker arm adj., either one needs to be fixed or it will a larger problem.Thanks
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.
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Changing the rear valve cover gasket on your vehicle would be not considered a "real" big job, but IS a time-consuming job.
In order to remove the rear cover, you first have to remove the intake plenum. If you do not remove the plenum, you can't get to the valve cover bolts that are under the plenum. After the plenum is off, the valve cover is easy to access. You will also need to replace the intake plenum gasket, if you do the job yourself.
I hope this information has satisfied your question.
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