Question about 2002 Oldsmobile Bravada

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The engine sounds like it needs a valve adjustment. I am told there in no adjustment required on this vehicle. What is the best way to reduce the engine noise?

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Sounds like a lifter may not be pumping up (assuming that it's hydraulic) You can add fuel treatments/ additives that helps lubricate the top end of the motor/piston. Also I think there is such stuff like honey bee oil, which is an extremely thick oil to help with valve seat leaks and blow-by etc..... May want to try 5 min motor flush to help clean the top end to see if it clears it up.

Posted on Oct 12, 2013

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Posted on Jan 02, 2017

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Ticking noise while in drive getting worse, been told that noise coming from bell housing?


Valve Adjustment

Print
The 4.2L and 5.3L engines do not require a periodic valve lash adjustment.
The 4.3L engines are equipped with screw-in rocker arm studs with positive stop shoulders. Because the shoulders that allow the rocker arms to be tightened into proper position, no adjustments are necessary or possible. If a valvetrain problem is suspected, check that the rocker arm nuts are tightened to 18 ft. lbs. (24 Nm). When valve lash falls out of specification (valve tap is heard), replace the rocker arm, pushrod and hydraulic lifter on the offending cylinder.

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My 1984 cb750sc making clinking noise at top end get louder wen give more rev


hi, it sound like you need the valve lifters adjusting, these can be adjusted to some extent but most often they not they need replacing, this can cause serious engine damage if one was to break so needs sorting sooner, check oil level is ok and replace if needed, this may reduce the noise, but this is all part of the wear and tare of an older vehicle, it may just need adjusting or it may need the lifters replacing all together,

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Knock when starting


Please identify the Make and Model of what you are driving. Some Ford V-8's from 2004-2008 had a major defect that I can give more info on. For other Vehicles, make sure the oil level is full.

When you hear a "Knock" and then a tapping, it can be a bad lifter or camshaft lobe. You may also have an oil pump that has gone bad and continues to damage the engine with less than ideal lubrication. Depending on the age of the motor, some older designs required the Valve train to be adjusted if they had adjustable "rocker arms".

Most likely you have more than 1 thing needing attention inside the engine. Besides the opinions here at Fixya, you may want to get several opinions from Mechanics who listen to your motor and give an estimate.

They would be telling the truth if they told you that you need to open the engine to get a complete price; because sometimes you can replace one part and other times many parts. It requires a Visual inspection and/or one done with measuring gauges.

About all you can do is shop for the best hourly rate $ and how many hours they need to repair it. There can be BIG differences in the cost of the parts too.

Jan 23, 2012 | Cars & Trucks

1 Answer

Valve chatter in the mornings when it is cranked. but sometimes during the day also. Someone told me to get vaves adjusted. how can i adjust them myself?


Hi Nick, Valve noise will be there all the time, unless the vehicle has hydrolic lifters. if it has then the lifters should be replaced. If it has adjustments you can check the clearance with a feeler gauge, but I believe the sound is more likely to be low oil pressure. this can be caused by the wrong oil filter having been fitted or the oil pump becoming weak. The third reason is wear on the connecting rod or main engine bearings. With mechanical adjustable followers the noise will be steady at all times and not disappear . As you haven't named the vehicle or engine type it's a little difficult to be explicit. Regards Johngee10

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Ok I would start by checking your shifter to make sure it adjusted right and you can do this by looking at your shift indicator if that is ok then might have a bad manual shift valve thats in the transmission, if that valve goes bad it would tell the pcm that your transmission is being shifted into another gear while your driving causing the Power control module (PCM) to out you vehicle into reduced engine mode

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Are the valves adjustable


I believe valves in modern vehicles are hydraulic and do not require adjustment. It is possible your vehicle may be different or has been modified. Solid lifters are not unknown just not real popular because of the maintenance they require. If there is a problem with the vehicle and you suspect valves are out of adjustment, you could remove the 4 bolts that hold the cover on and look. If there are adjusters, they will be immediately visable.

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MILEAGE PROBLEM


possible valves were adjusted to tight. should not have had to adjust idle if it was too low there was a reason for this.possibl;e vacuum leak or something was unhooked or broke while servicing

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