HELP)!!! Compression Numbers
Aug 29, 2007, 07:59 AM
#16
When you did the compression test did you unplug the crankshaft position sensor? If you didnt for some reason it will give you false readings. I comp checked my car and another one by unplugging the camshaft position sesnor and both cars were low on #3. We found out it was the wrong way and unplugged the crankshaft position sensor and now it is perfect across all 4 cylinders.
Aug 29, 2007, 09:17 AM
#18
Evolved Member
Thread Starter
iTrader: (15)
Join Date: May 2006
Location: Arizona, FTW
Posts: 1,082
Likes: 0
Received 0 Likes
on
0 Posts
haha I redid my compression test, and now I am coming up with 150-152 across all 4, but this time I disconnected the crank position sensor. Why did the reading change? AHHAHAH I hate this lol.
Aug 29, 2007, 09:29 AM
#19
Your supposed to do the test with TB wide open and CAS DISCONNECTED.
Firing order: 4 - 2 - 1 - 3, perhaps thats why. I noticed it takes about 7 - 8 starter revolutions to show a consistant chamber psi, which is needed. That way numbers will be like in the 180's and you know all cyl recieve equal input
Good news your car is good and your technique sucks
Firing order: 4 - 2 - 1 - 3, perhaps thats why. I noticed it takes about 7 - 8 starter revolutions to show a consistant chamber psi, which is needed. That way numbers will be like in the 180's and you know all cyl recieve equal input
Good news your car is good and your technique sucks
Aug 29, 2007, 12:46 PM
#22
Evolved Member
Thread Starter
iTrader: (15)
Join Date: May 2006
Location: Arizona, FTW
Posts: 1,082
Likes: 0
Received 0 Likes
on
0 Posts
Your supposed to do the test with TB wide open and CAS DISCONNECTED.
Firing order: 4 - 2 - 1 - 3, perhaps thats why. I noticed it takes about 7 - 8 starter revolutions to show a consistant chamber psi, which is needed. That way numbers will be like in the 180's and you know all cyl recieve equal input
Good news your car is good and your technique sucks
Firing order: 4 - 2 - 1 - 3, perhaps thats why. I noticed it takes about 7 - 8 starter revolutions to show a consistant chamber psi, which is needed. That way numbers will be like in the 180's and you know all cyl recieve equal input
Good news your car is good and your technique sucks
Well I did first test with the Tb wide open and CAS disconnected, and got low compression in cylinder 3, but when I did the second test I got good compression on all cylinders with the crank sensor unplugged and tb wide open..
Aug 29, 2007, 12:52 PM
#23
Evolved Member
iTrader: (21)
Join Date: Jan 2004
Location: South Carolina
Posts: 2,210
Likes: 0
Received 0 Likes
on
0 Posts
Cylinder number three in the evos is known to always be low. Some more than others. If the leak down test was good and the compression did not rise with oil added I would look for your lack of power somewhere else.
