cause of low compression????

[lzertrbo]

k so i was reading one of my posts and some guy said that i could have low compression if my cams arent matching up.. can this happen? and yes they dont match up and i think i can hear some air leaking do i just need to do that

 

[slinarez25]

If you have the cams backwards then you wouldnt have any compression. For an example, the intake cam in the exhaust cam's spot and vise versa.

 

[420a_turbo]

If you have the cams backwards then you wouldnt have any compression. For an example, the intake cam in the exhaust cam's spot and vise versa.

You wouldnt have a running car either....

 

[slinarez25]

You wouldnt have a running car either....

Yup, considering the "no compression" part in my post.

 

[lzertrbo]

k aparently you didnt read what i said if the cam markings dont match up would it cause low compression

 

[16G1G4G63Talon]

there are a few causes of low compression, yea cams not matchin up are one cause but theres more than just that. does the car smoke at all?

 

[lzertrbo]

no smoke no nothing it juust has low compression

 

[YOOOO]

does it run?

 

[Jeff99GS]

Low compression can be caused by a few things. Wore out Piston rings, Leaky valves, Improperly seated valves, incorrect engine timing.

First you should get the timing belt and tension set properly. Then I suggest doing a compression test. Record your result, Then do a "Wet comp test" by adding 1 capful of 10w30 engine oil into each spark plug hole then RE-test. If the comp numbers went up when you put in the oil then that means the Piston rings are wore out and will need replaced.

Incorrect engine timing can cause a slight drop in compe because its opening and closing the valves at the wrong time. So get that timing set perfect. Dowel pins at 12 o-clock and timing marks level with head surface.

 

[bomper04]

low compression is most definitely possible if cams are not in time with each other. as stated earlier, there are several reasons for low compression, that being one of them. and when do you hear air leaking?

 

[Lusion972]

Low compression can be caused by a few things. Wore out Piston rings, Leaky valves, Improperly seated valves, incorrect engine timing.

First you should get the timing belt and tension set properly. Then I suggest doing a compression test. Record your result, Then do a "Wet comp test" by adding 1 capful of 10w30 engine oil into each spark plug hole then RE-test. If the comp numbers went up when you put in the oil then that means the Piston rings are wore out and will need replaced.

Incorrect engine timing can cause a slight drop in compe because its opening and closing the valves at the wrong time. So get that timing set perfect. Dowel pins at 12 o-clock and timing marks level with head surface.

This guy has the best advice, simple diagnostics can pin point where your losing compression. Only 3 places it can lose compression...piston, head or head gasket. Do the oil in the chamber test if that proves nothing then do a leak down test by forcing air in to the cylinder and see if it holds, if it doesnt then you know your valves arent closing as they should. When a head gasket blows on a DSM you can normally tell because they tend to over heat. Is your car running hotter then usual?

 

[lzertrbo]

the engine is out of the car but it ran when i pulled in, i can hear leaking air when it creates pressure, and i need a detailed how to on timing I've never done it then i will come back with results

 

[bomper04]

you hear air because of either a) overlap or b) cylinder on the exhaust stroke and valves opening..

 

[TalonJohn94]

Timing Belt VFAQ (Timing Belt TSB - ENHANCED)

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