Clattering on acceleration

Asked by Mar 29, 2016 at 07:43 AM about the 1988 GMC Sierra 1500 K1500 Standard Cab LB 4WD

Question type: Maintenance & Repair

When accelerating, there's a fluttering noise,
similar to what a diesel sounds like. Lifters, bearing  
pack?  No good ideas

6 Answers

109,725

How about a thrown rod in the engine.

109,725

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

109,725

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

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