loss of compresion

Asked by Feb 03, 2009 at 12:01 AM about the 1997 Porsche Boxster Base

Question type: Maintenance & Repair

i have a 97 porsche boxster that only has 35 pounds of compresion in the # 3 piston.what could be the cause of this issue. i think it may be the rings becasue the rest of the cylinders have full compresion.

2 Answers

65

It could be the rings, but it is most likely the valves or the head gasket, possibly the piston. You could have a chipped or bent valve, if that cylinder was burning very lean it could have burned a hole in the piston. Your spark plug hole may be leaking, check to see if the washer is damaged or broken, if that's OK you are going to have to pull the cylinder head off and physically inspect the valves and the pistons. If that doesn't get you anywhere you should pull the oil pan off and inspect the crankshaft and rod bearings. I don't know how easy or difficult that is to do on a Porsche but in my experience the most likely answer is te valves or the head gasket.

195

Do a leakdown test to determine with a greater certainty.

Your Answer

Porsche Boxster Experts

  • #1
    Stephen Smith
    Reputation
    490
  • #2
    Michael Kane
    Reputation
    360
  • #3
    Tim O'Meara
    Reputation
    290
View All

Related Models For Sale

Used Porsche 911
121 Great Deals out of 5,285 listings starting at $10,099
Used Chevrolet Corvette
114 Great Deals out of 16,238 listings starting at $3,995
Used Ford Mustang
348 Great Deals out of 41,846 listings starting at $1,488
Used Mercedes-Benz SL-Class
54 Great Deals out of 3,367 listings starting at $3,995
Used Mazda MX-5 Miata
55 Great Deals out of 4,166 listings starting at $2,088
Used BMW 3 Series
1,144 Great Deals out of 34,047 listings starting at $1,209
Used Mercedes-Benz SLK-Class
40 Great Deals out of 1,358 listings starting at $1,492
Used BMW M3
29 Great Deals out of 1,841 listings starting at $5,495
Used Chevrolet Camaro
390 Great Deals out of 31,491 listings starting at $3,000

Used Cars For Sale

2016 Porsche Boxster Base For Sale
11 listings starting at $42,990
2015 Porsche Boxster Base For Sale
84 listings starting at $33,995
2014 Porsche Boxster Base For Sale
44 listings starting at $32,990
2013 Porsche Boxster Base For Sale
66 listings starting at $29,900
2012 Porsche Boxster Base For Sale
5 listings starting at $18,500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.