Sad compression test
04-13-2012, 12:54 PM
#1
Burning Brakes
Thread Starter
Sad compression test
My car mostly sits idle nowadays as I am literally on the other side of the world. I am back for 2 weeks and noticed that idle and decel vacuum are both around 15/16 in/hg when previously they were at 18/22 respectively.
Got my regular auto shop to do a service today and a compression test and the numbers are not good. 60/90/90/60. Previously this same engine was around 120 across the board (I forget exact numbers but they were dead even). Question, can having a car sitting around idle for around 4 years do this? My dad drives it every few weeks, does maybe 15-20 miles of highway driving in it. Every 6-12 months I am back and it has 2 weeks of fairly heavy street driving (as in mileage, not street racing).
Got my regular auto shop to do a service today and a compression test and the numbers are not good. 60/90/90/60. Previously this same engine was around 120 across the board (I forget exact numbers but they were dead even). Question, can having a car sitting around idle for around 4 years do this? My dad drives it every few weeks, does maybe 15-20 miles of highway driving in it. Every 6-12 months I am back and it has 2 weeks of fairly heavy street driving (as in mileage, not street racing).
04-13-2012, 09:14 PM
#5
Burning Brakes
Thread Starter
That I'm not sure about paully. Having said that, there was a lot of oil on the plugs and evidence of blowby. Car has about 185000 kms on it so I was thinking it might be time for a refresh in the not too distant future. Though with numbers like that I was expecting the car to drive a lot worse than it is. They did also suggest just driving it a lot to see if it came good.
04-13-2012, 10:00 PM
#6
Rennlist Member
My car mostly sits idle nowadays as I am literally on the other side of the world. I am back for 2 weeks and noticed that idle and decel vacuum are both around 15/16 in/hg when previously they were at 18/22 respectively.
Got my regular auto shop to do a service today and a compression test and the numbers are not good. 60/90/90/60. Previously this same engine was around 120 across the board (I forget exact numbers but they were dead even). Question, can having a car sitting around idle for around 4 years do this? My dad drives it every few weeks, does maybe 15-20 miles of highway driving in it. Every 6-12 months I am back and it has 2 weeks of fairly heavy street driving (as in mileage, not street racing).
Got my regular auto shop to do a service today and a compression test and the numbers are not good. 60/90/90/60. Previously this same engine was around 120 across the board (I forget exact numbers but they were dead even). Question, can having a car sitting around idle for around 4 years do this? My dad drives it every few weeks, does maybe 15-20 miles of highway driving in it. Every 6-12 months I am back and it has 2 weeks of fairly heavy street driving (as in mileage, not street racing).
This does not seem right. I would retest after more drive time. Hard to believe you would loose compression on all 4 cylinders. Normal would be 130-150.
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04-14-2012, 10:30 AM
#8
Rennlist Member
04-16-2012, 09:45 PM
#10
Burning Brakes
Thread Starter
Went up a mountain yesterday and starting to wonder if my autometer boost/vac is faulty. The autometer shows always shows a bit over 15 in/hg when the dash shows anything from 0.4 almost down to the little stop. Ie it doesn't move when the dash gauge does.
