Clattering on acceleration
When accelerating, there's a fluttering noise,
similar to what a diesel sounds like. Lifters, bearing
pack? No good ideas
How about a thrown rod in the engine.
If it a pre ignition sound, try disconnecting the spout connector and see if it goes away or is a lot less, if that proves out then check the base timing, it maybe advanced too far, if the timing is right on then I suspect that the ECM is over advancing the spark while running and will have to be replaced. HTH
Truck runs good, no constant chattering, only on acceleration, and not consistently. Very mild diesel-powered noise
Diesel sounding noise
Bit it, then still do the time no hung and you should also check the EGR valve it may not be working.
Will do. Thnx
Looking for a Used Sierra 1500 in your area?
CarGurus has 60,427 nationwide Sierra 1500 listings starting at $1,299.
Search GMC Sierra 1500 Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
GMC Sierra 1500 Experts