Jump to content

compression test :( helpppp!!!


Recommended Posts

right having bad trouble with the gt starting then yesterday wouldnt start at all,

did a compression test today..... and verry poor

1- 100

2-125

3-75

4-75

any ideas what could be causing this ideas would be verry much appreciated :D

Link to post
Share on other sites

right bit of a development with it , got it going agen after towing it off wared it up to running temp and it fires back up no problem sooo.....

went to it this morning first turn it fired, ran it for 5 mins switched it off and left it till dinner......................... went to start it and it wont go agen :/ but has a really strong petrol smell

any ideas to that one?

Link to post
Share on other sites

oh another thing, do a compression test with it warmed up properly, you will get odd/incorrect results if you do it from cold as your piston rings will expand slightly when hot.

If your still getting results below 150psi a cylinder then it could be worn rings, you can check to see if the rings are worn by pouring a teaspoon of oil down each cylinder, crank it over over again with the tester and see what you get. If it shoots up loads then your rings are worn,if its still low then it will point to other things such as the head/vales etc.

Good luck!

Link to post
Share on other sites

just out of interest do you have a fuel pressure regualtor on your car? check that the two bolts for the adapter in the fuel rail havnt come loose. also as taggy says do the compression test hot. and the teaspoon of oil trick to try and raise compression by sealing the piston better in the bore.

Link to post
Share on other sites

no engines still standard ill check the bolts and try agen and keep updated mate

and i did the oil thing with the cold test got one of the 75's up to just under 100 but still wouldnt fire have tto a hot one tommorow

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...