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Difference Between Failing Valve Springs And Stuffed Coils/plugs


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  • Member
  • Member For: 12y 9m 22d
  • Gender: Male
  • Location: Adelaide S.A

Howdy.

What is the main difference between stuffed valve springs and failing coil packs/plugs. Probably an amatuer question but im trying to get to the bottom of something. When coilpacks/plugs are gone does the car usually idle really rough after giving it a bit of a boost or is that from the valve springs. Cheers.

  • Member
  • Member For: 12y 9m 22d
  • Gender: Male
  • Location: Adelaide S.A

Forgot to mention under boost in higher gears the car seems to misfire every now and then keeps boosting while it is missfiring

  • Manual mode ________________________ All day, erryday
  • Donating Members
  • Member For: 17y 5m 8d
  • Gender: Male
  • Location: Probably above atmospheric pressure

Classically the coils show up issues high in rev range, loss of power feeling, whereas valve springs cause rough idle after WOT, like when you roll up to the next set of red lights hahaha.

  • Moar Powar Babeh
  • Lifetime Members
  • Member For: 19y 7m 9d
  • Gender: Male
  • Location: Perth

I'd say your springs have sprung if your getting rough idle issues after a wot run.

  • Member
  • Member For: 12y 9m 22d
  • Gender: Male
  • Location: Adelaide S.A

Please elaborate on "wot" ha ha. And is it unsual for it to do it occasionally. Got the car re tuned a few months ago with a new actuator because I was after more power and my tuner said it seemed fine on the dyno. However it is still doing it from time to time. Doing my head in! and to make it worse got the turbo rebuilt because last week because old one shat itself and when the tuner took the car for a road test he said it seemed fine even but it is far from fine. Should I start with the plugs or change the valve springs first?

  • Manual mode ________________________ All day, erryday
  • Donating Members
  • Member For: 17y 5m 8d
  • Gender: Male
  • Location: Probably above atmospheric pressure

I had tired springs and would get very bad idle seemingly at random...took it in to get them changed and they found the timing off one tooth...has been 90% better since then!

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  • Member
  • Member For: 12y 9m 22d
  • Gender: Male
  • Location: Adelaide S.A

Did u ever notice that the car would missfire under acceleration? especially in the higher gears

  • Member
  • Member For: 12y 2m 6d
  • Gender: Male
  • Location: Perth

I had tired springs and would get very bad idle seemingly at random...took it in to get them changed and they found the timing off one tooth...has been 90% better since then!

steve did that happen when it was cold? First thing in the mornings my car is a bit rough and nearly stalls sometimes but after driving like 300 meters it's fine.
  • Donating Members
  • Member For: 16y 4m 25d
  • Gender: Male
  • Location: CQ

Mine missed once up high in the revs mate, then would idol rough after giving it a squirt. New springs and it never did it again and picked up a few mph at the track

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