Main Menu

#3 cylinder comp and leak down results suspect?

  • 1988
  • 911 Carrera Cabriolet
Mileage: 
55 400
Engine
Car Purchase
Pacifica, 
California

Shareing my results for a prospect 1988 911 3.2 for any feedback from those that might know a thing or two based on the numbers alone.

Car currently has 55k miles on it and has been driven less than 1k miles per year on average between 93’-19’ by it’s current owner. It has sat undriven regularly for the most part over the last 10 years. Seems to perform well and power feels strong and consistent through  all gears. Engine is also very dry.

Results from the PPI are:

Compression test dry #1 = 135, #2 = 140, #3 = 120, #4 = 135, #5 = 150, #6 = 150 (add .2 for wet compression retest)
Leak down warm #1 = 9%, #2 = 8%, #3 = 12%, #4 = 5%, #5 = 5%, #6 = 4%

#3 cylinder seems suspect for a leaky valve since wet and dry readings we’re consistent from what I’ve learned. Could also simply need a valve and timing adjustment.
Any other thoughts based on the results alone?

Cheers!

You must log in to view answers associated with technical questions. Join PCA to participate in our community.
No votes yet