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Re: 94 buick p.a. knocking sound
Hello, the knocking noise you are hearing is rod bearings. There is going to be excessive clearance in the rod bearings on the crankshaft.You want to have this seen about as soon as possible or either she will put you walking. Thank you
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Apparently the 3.5 liter V6 had a lot of oiling problems, see link attached. Problems That Plague Chrysler 3 5L Engine Create Rebuild Opportunities
The slight knocking you hear may be a valve lifter that has gummed up. The head gasket problem may have allowed some coolant to get into the oil exacerbating gunk buildup. If it a deeper problem like rod bearings, you would have to decide if it is worth the trouble of fixing it or drive it until it drops.
should have done an engine flush before the oil change .as can be dirty filter at the oil pump. do it again ,but engine flush first. run the engine on tick over.but it sounds like the damage has been done .failed main bearings.
po321 inthe code for the knock sensor error.look for any unusual knock type sounds, such as , noisy rocker arm, harmonic balanced rubber getting loose, or detonation from low octain fuel, or egr malfunction. check to be sure sensor wiring is ok, or that it's not unplugged.knock sensor is there to detect detonation (spark knock) so pcm can ****** timing.
When you say engine knocks ..what type of knocks//where does the knocks come from top of engine like atapping/ knocking from the bottom of engine a harsh knock/ does it sound like it comes with 1 piston up on TDC or BDC or more than one knock per 1 RPM /AND whats the condition of the oil at the moment / and what engine have you got in it.
Let me know how you get on ASAP Ron