Compression test

[E3newbie]

Hi guys,
Can any one tell me how to conduct a compression test? Also, What is AFR stand for? Thanks guys..

 

[huakenny]

AFR = Air Fuel Ratio

 

[khoyos]

remove your spark plug, place the compression tester at the plug hole (meaning compression tester takes spark plug place) and crank the engine usually up to 5-6cranks to get reading. usually for turbo, anything lower than 8 should be considered "ada problem"...

ask your mechanic to do it for u. most probably they wont charge u for doing a compression test. u cant DIY unless u have the compression testing tool...

 

[huakenny]

where to buy tat tool bro?

and if the compression found out is not match wit rhe maunufacturer's spec...wat kinds of problems the car is having a?:Not_Impressed:

 

[mi_scuzi]

remove your spark plug, place the compression tester at the plug hole (meaning compression tester takes spark plug place) and crank the engine usually up to 5-6cranks to get reading. usually for turbo, anything lower than 8 should be considered "ada problem"...

ask your mechanic to do it for u. most probably they wont charge u for doing a compression test. u cant DIY unless u have the compression testing tool...

lower than 8 got problem?something wrong wif the piston?

 

[E3newbie]

Air fuel ratio? Thanks. Also, do all mechs have the comp test tool cos i've never heard of mine mentioning such a thing! I really need a new mech!

 

[khoyos]

not all mechs have the compression tester, but workshops which does modifications n really serious work should have them.

air fuel ratio sensor is a sensor which is plugged to ur exhaust, to know whether ur fuelling is enough or not. most tuners have it. its the definitive tool to get feedback on fuelling tuning...

 

[jinkl]

e3newbie : u can know whether ur engine condition is ok or screwed hehehehe

 

[jswong]

lower than 8 got problem?something wrong wif the piston?

Yeah, if it's too low, then you're losing compression somewhere. It could be that the piston rings are worn out. Or, a bad case would be your engine head is screwed, like in the case of my pal. It's probably due to detonation - the valve seat has a nick in it, so some fuel-air charge gets squeezed out from the nick during the compression stroke, leading to compression loss.