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1984 Jeep Cherokee engine knocks

Tiny
BULLDOG102DS
  • MEMBER
  • 1984 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • MANUAL
  • 16,000 MILES
I have a 1984 jeep Cherokee and lately the engine has been knocking I know it is the wrist pin in one of the pistons but I don't know which piston it is, how do I isolate which piston the knock is coming from.
Tuesday, October 28th, 2008 AT 7:16 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

you will have to isolate the cylinder, if fuel injected just un plug the injectors one at a time, you may here a change in the knock as there is less pressure on the piston with that cylinder dead, don't try removing the plug lead as you will get a shock, and with the extra fuel in the cylinder when you hook up again you could blow out a muffler, if carby this test can be done on an oscilloscope, but a qualified mechanic will need to hear this as the change in noise will be slight, start here.

Mark (mhpautos)
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Tuesday, October 28th, 2008 AT 8:31 PM

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