hhr engine tapping eng knock sensor
Country: United StatesMake: ChevroletModel: HHR LTYear: 2008
only engine code knock sensor
Does the engine tapping noise occur all the time,cold or hot.
Engine just serviced. After pickup on the way home i heard a tapping sound comming from the engine like a stuck lifter or something. Tapping when engine is cold or hot. Can hear at idle and while driving.Then engine light came on steady. Checked gas cap, filled up with 89 oct (reg use 87 oct) no help. Returned to my mech. Code said engine knock sensor. He has inspected everything and can find nothing worng, but the tapping is still there. What next, change the sensor ro any other ideas?
I would have the oil filter changer again.You may have a problem with proper flow through the filter causing your noise.A code for a knock sensor will cause a check engine light but won't cause an actual noise.
Oil filter changed,result still the same result. Not sure if the mech checked the oil pressure. if oil pressure is good, what step next?
What engine do you have?
Crap, not sure, the HHR is in the shop.It's not the supercharged one. I'll give them a call. I hpe this does not require a engine tear down.
You will need to have the oil pressure tested at the engine block then at the cylinder head.If the pressure is normal at the engine block bot low at the cylinder head then there is a blockage in the head.The head will need to be removed and cleaned out if this is the case.Here is the testing procedure.
This PI was superseded to update model years. Please discard PIP4495B.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
A technician may find noise coming from the cylinder head. This may be due to loss of oil pressure.
This concern may be caused by debris clogging the oil feed restrictor in the cylinder head passage. The oil feed hole has a small inner diameter and may clog if debris or excessive RTV or similar type gasket/sealer has dislodged and become stuck in this passage. Anytime RTV or similar sealer is used, care must be taken not to use excessive amounts that can become dislodged causing future concerns. This restrictor is located in the oil feed passage to the cylinder head and cannot be inspected/cleaned without cylinder head removal. NOTE: The restrictor is not available separate from the cylinder head. See callout #2.
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To diagnose this concern: Using a mechanical oil pressure gauge, check/compare the oil pressure in the block with the oil pressure in the cylinder head. The block can be checked by removing the oil pressure sender or another engine block oil gallery plug. The oil pressure to the cylinder head can be checked by removing one of the oil galley plugs in the cylinder head. See callout #1.