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Knocking noise

Tiny
DLIST66
  • MEMBER
  • 1998 PLYMOUTH VOYAGER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 87,000 MILES
98 plymouth voyager 3.0 engine. Has a knocking noise in engine that at best guess is around the alternator area. Only hear it when idling and not during acceleration. No loss of power and engine shifts normally. Runs at normal temperature. What is your best diagnoses of problem?
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Friday, February 11th, 2011 AT 11:26 PM

2 Replies

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Knocking /ticking/tapping, hard to tell what a sound is cause we all have different ideas about sounds. Could be lifter/rocker or harmonic balancer?
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Friday, February 11th, 2011 AT 11:58 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,916 POSTS
Hi guys. If it goes away when you increase engine speed, suspect a hydraulic lash adjuster in the tip of one of the rocker arms. A pin hole can wear in the bottom of it and lets the pressurized oil leak out. I have a 3.0L in my '88 Grand Caravan with over 380,000 miles. It has been doing this for the last 100,000 miles. Let's people in the parking lots know I'm coming!

Caradiodoc
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Saturday, February 12th, 2011 AT 4:49 AM

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