kevinthegreat Posted January 11, 2010 Report Share Posted January 11, 2010 just like the title says.... i have pressure in my valve covers and its making a loud screeeching. does anyone know what is wrong? when i take the cap off and release the pressure the noise stops. Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted January 11, 2010 Report Share Posted January 11, 2010 clogged PCV hose? Quote Link to comment Share on other sites More sharing options...
kevinthegreat Posted January 11, 2010 Author Report Share Posted January 11, 2010 do you think it could be a bad pcv? Quote Link to comment Share on other sites More sharing options...
misterp Posted January 11, 2010 Report Share Posted January 11, 2010 Is all your emissions equipment still factory? Or did you install a catch-can or ??? Mr. P. Quote Link to comment Share on other sites More sharing options...
kevinthegreat Posted January 11, 2010 Author Report Share Posted January 11, 2010 its all factory. when i take the oil cap off the pressure is released and WHATEVER is making the noise quits Quote Link to comment Share on other sites More sharing options...
silverado_ss_04 Posted January 11, 2010 Report Share Posted January 11, 2010 just run no oil cap Quote Link to comment Share on other sites More sharing options...
kevinthegreat Posted January 11, 2010 Author Report Share Posted January 11, 2010 lol that would keep the noise from happening...... i just learned that we dont have pcv valves but they are restricters. could that be making the noise? Quote Link to comment Share on other sites More sharing options...
misterp Posted January 11, 2010 Report Share Posted January 11, 2010 (edited) While the engine is idling, pull the PCV valve from the driver's valve cover and check for suction - if there is no suction, then the PCV line is blocked; if there IS suction then you have hellacious amount of blowby at idle and I would do a cylinder kill test then a leakdown test. And to triple-check, first place a piece of paper over the oil filler hole and see if there is suction or blowby at idle (there should be suction). Mr. P. * I just had a thought, the whistling could be SUCTION at the oil fill cap instead of blowby; if this is the case, the motor is good and you need to replace the rubber gasket on the oil fill cap, or the dipstick tube. Edited January 11, 2010 by Mr. P. (see edit history) Quote Link to comment Share on other sites More sharing options...
kevinthegreat Posted January 11, 2010 Author Report Share Posted January 11, 2010 While the engine is idling, pull the PCV valve from the driver's valve cover and check for suction - if there is no suction, then the PCV line is blocked; if there IS suction then you have hellacious amount of blowby at idle and I would do a cylinder kill test then a leakdown test. And to triple-check, first place a piece of paper over the oil filler hole and see if there is suction or blowby at idle (there should be suction). Mr. P. * I just had a thought, the whistling could be SUCTION at the oil fill cap instead of blowby; if this is the case, the motor is good and you need to replace the rubber gasket on the oil fill cap, or the dipstick tube. i will do those tests tomorrow...... if it makes it any easier to diagnose, the noise is coming from the passenger side towards the end of the end of the valve cover. i havent take the engine covers off yet to check it out yet since it was dark when i discovered it Quote Link to comment Share on other sites More sharing options...
kevinthegreat Posted January 12, 2010 Author Report Share Posted January 12, 2010 i checked for suction and there was. Quote Link to comment Share on other sites More sharing options...
misterp Posted January 12, 2010 Report Share Posted January 12, 2010 i checked for suction and there was. suction at the PCV valve, or suction at the oil fill cap, or both? Mr. P. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.