Could this be a timing chain issue?
Asked by Jason Aug 19, 2023 at 10:52 AM about the 2011 INFINITI QX56 RWD with Split Bench Seat Package
Question type: Maintenance & Repair
I hear a hard knock or two when starting the vehical usually on hot starts and it
sounds like it has bad gas going up some inclines. Could this be a timing
chain?
2 Answers
It could be a lot of things. Piston slap, bearing noise, timing chain, sticking lifter, wrong oil, engine heat soaking when you shut it off making the oil too thin, an accessory like the air conditioning compressor. Hope that helps! Jim
Odd that is does it at operational temperature, usually they only do it at initial start up cold, the only other reason could be the timing chain guides are badly worn and letting the chain clatter. either way if you don't get it fixed very soon you could wind up with engine components scattered all over the ground
