Having problems with your 1998 Pontiac Sunfire ?

1998 sunfire 2.2 rattling/knocking noise at idle, dissapates at higher rpm. replaced timing chain tensioner and chain still does it.

Posted / edited by AnonymousUser on : 26-02-2018

Answers :

There are many other possibilities that are to be checked, other then timing chain and chain tensioner:---\015\0121) Loose timing chain, bad timing chain tensioner.
2) Bad lifter.
3) Bent valve.
4) Improper timing (piston striking valve).
5) Bad wrist pin.
6) Spinning or corroded rod bearing.
7) Spinning or corroded main bearing.
8) Excessive piston to bore clearance.
9) Excessive bearing to journal clearance, main or rod.
10) Failing oil pump

ALSO it could be a loose flywheel/flexplate bolt.could be lifter knock, or it could be Injector tick. injectors are more noticeable at idle, and lifter knock is all the time loud, unless it's doing it from oil pressure drop, and it might go away with RPM.As you mentioned in your case, that noise disappears at high rpms.\015\012----------\015\012This troubleshooting will help, to locate exact fault paret causing this noise.Thanks.Helpmech.\015\012
Repair Help & Product Troubleshooting for 1998 Pontiac Sunfire

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