How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask David H Your Own Question
David H
David H, GM master certified
Category: Chevy
Satisfied Customers: 2678
Experience:  Cadillac Technician 18 years cadillac dealer.ase master master certified
Type Your Chevy Question Here...
David H is online now
A new question is answered every 9 seconds

Chevrolet HHR LT hhr engine tapping eng knock sensor

Customer Question

hhr engine tapping eng knock sensor
Submitted: 6 years ago.
Category: Chevy
Expert:  David H replied 6 years ago.

David H :

Does the engine tapping noise occur all the time,cold or hot.

Customer: replied 6 years ago.

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?


Expert:  David H replied 6 years ago.
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.
Customer: replied 6 years ago.
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?
Expert:  David H replied 6 years ago.
What engine do you have?
Customer: replied 6 years ago.

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.

Expert:  David H replied 6 years ago.
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.

Subject:Cylinder Head Tick Noise And/Or Damage
Models:2011 Buick Regal
2010-2011 Buick LaCrosse
2002-2005 Chevrolet Cavalier
2005-2010 Chevrolet Cobalt, Cobalt SS
2010-2011 Chevrolet Equinox
2006-2011 Chevrolet HHR
2008-2010 Chevrolet HHR SS
2004-2011 Chevrolet Malibu
2004-2005 Chevrolet Malibu Classic
2010-2011 GMC Terrain
2002-2004 Oldsmobile Alero
2007-2010 Pontiac G5
2006-2010 Pontiac G6
2002-2005 Pontiac Grand Am, Sunfire
2005-2006 Pontiac Pursuit (Canada Only)
2006-2010 Pontiac Solstice
2007-2010 Pontiac Solstice GXP
2007-2010 Saturn Aura, Aura Hybrid
2003-2007 Saturn Ion
2004-2007 Saturn Ion Redline
2001-2005 Saturn L Series
2007-2010 Saturn Sky, Sky Redline
2002-2010 Saturn Vue
2007-2010 Saturn Vue Hybrid
With any of the following engines:
2.0L Engine (LSJ)
2.0L Engine (LNF)
2.2L Engine (L61)
2.2L Engine (LAP)
2.2L Engine (LE8)
2.4L Engine (LE5)
2.4L Engine (LE9)
2.4L Engine (LAT)
2.4L Engine (LAF)

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.

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.