Question about 2003 GMC Sierra
The noise sounds like lifters it is always there when it is running . Oil pressure is good. Is there anything else it could be or anyway to check or trouble shoot what it could be. I want to do the lifters soon I just want to make sure I'm not wasting my time
There is,If you do the lifter you could be after something else,The noise sounds like a collapsed lifter,A collapse lifter can cause a misfire,The 2003 GMC sierra or I should say the 4.8 engines suffer from a cut O-ring between the oil pump screen and the oil pump causing oil areation,resulting in lifter noise,The noise will be present a cold start and then diminish at warm up.
Posted on Dec 03, 2012
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Posted on Jan 02, 2017
the knock sensors are located below the intake plenum,or,upper intake manifold as some call it, they screw into the lower intake, the front one is sensor 1, the rear is sensor 2. it is wise to change both if you have some miles.since you are going to be buying a gasket set to do this job.the sensors are cheaper than the gaskets.
Posted on Jun 12, 2009
SOURCE: I have a 2003 gmc
ONLY A COUPLE OF PLACES WILL LEAK UNDER PRESSURE OIL COOLER LINES FROM ENGINE TO RADIATOR, OIL FILTER , AND OIL PRESSURE SENDING UNIT IN BACK OF ENGINE BEHIND INTAKE MANIFOLD
Posted on Oct 20, 2010
SOURCE: 07 GMC sierra 111,000 miles
When you replace spark plug look at the gap is it worn(just compare it to a new on)now is this noise at idle or are you acclerating at idle its a lifter noise.If its at acceleration then time for spark plugs fuel filter.Remeber to use the proper weight on it.Dont listen to someone that says you can use a thicker oil. Make sure the oil you use has not been strip of zinc which API has removed and allot of premature engine failure are occuring. Use mobil stay away from penzoil they have no anti wear additives engine are wearing out quickly.
Posted on Apr 21, 2011
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