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Rough idle

Tiny
JIMSAUTO
  • MEMBER
  • 16 POSTS
Did compression check today and #1 cyl was 0, all others were between 155 and 175 psi after 6 strokes(first stroke was above 130 on all but #1). Looks like either a valve is stuck open or a valve spring broke. Customer deciding what he wants to do now
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Wednesday, October 10th, 2018 AT 4:48 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It may be more thatn that. That may not be a free spin motor so look for engine damage inside cylinder. Or pump oil in cylinder and seeif compression comes up at all.
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Wednesday, October 10th, 2018 AT 4:48 PM (Merged)
Tiny
JIMSAUTO
  • MEMBER
  • 16 POSTS
I used a small LED snake light to look in through the plug opening and all I could see was the piston, of course don't get to see much that way. Plus with the research I have been doing this model Jeep with the 3.7 has a sludge problem and valves like to stick open. Also some cases of broken valve springs.
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Wednesday, October 10th, 2018 AT 4:48 PM (Merged)
Tiny
DUMNUTS
  • MEMBER
  • 1 POST
  • 2006 JEEP LIBERTY
Engine Performance problem
2006 Jeep Liberty 6 cyl Four Wheel Drive Automatic 50000k miles

po300 code engine misfires rough idle at times new plugs didn, t help what next?
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Wednesday, October 10th, 2018 AT 4:48 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,254 POSTS
Did you replace the ignition wires? Also, have you checked for vacuum leaks?
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Wednesday, October 10th, 2018 AT 4:48 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
You'll see when or if you get teh valve cover off
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Wednesday, October 10th, 2018 AT 4:48 PM (Merged)

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