really strange noise

[boost fiend]

ok, heres the problem. lets see if anyone out there knows wtf to start looking for. i can sit in the car with the engine off listing to the radio and when i shut the key off i hear a pop/hiss(like the bov just vented only quieter) from somewhere near the engine. it only happens when it wants too. i cant make it do it either(my ride has a mind of its own.) it doent do it on a regular basis either. happend today, wed of last week. bout a month ago. im at my wits end here. again it only happens when the engine is off.

so any ideas people???????:icon_evil :1zhelp:

 

[mkIIIman089]

Could it be that you are inadvertantly touching the brake pedal and something is happening to the valve which holds vacuum in the brake booster.

 

[GrimJack]

Check the vacuum lines to the fuel pressure VSV on the intake side of the engine. It should click a few times, quietly, after you turn the car off.

 

[gixxer750]

lol.....unless your like me and your engine has no vsv's whatsoever... or EGR, or ISC, or Charcole can, or dashpots....

 

[IJ.]

Charcoal Cannister can fart when there's a change in pressure in the tank, mine was doing it after sitting for 6 months as the temp in the workshop would change!

 

[GrimJack]

Check the vacuum lines to the fuel pressure VSV on the intake side of the engine. It should click a few times, quietly, after you turn the car off.

I have ZERO clue what I was thinking of when I posted this, but obviously it wasn't Supras. Please ignore this post, it's so wrong that it's actually funny.

 

[boost fiend]

lol grimjack!!!! i hate brainfarts. and no im not touching the brake pedal. i have removed the charcoal canster recently but it would do it before i removed it. its not a bad thing(i think), but i just dont like suprises on my ride. suprises cost too much and my wallet still hurts from replacing the clutch.

 

[americanjebus]

i hear this sound too dude. it makes the same sound as when you put the head on for the first time and you give it a full crank roation and can hear the air being pushed and releived through the cylinders

when i turn it off i hear that slow motion blow off sound, but only on occasion. i figured it was a valve opened half way releasing air or something or some knid of vacuum leek but it never really got my attention untill now.

 

[boost fiend]

im not too sure what it is. i could see the point about the valves. i do need to redo the shims for the valves. any other ideas are welcome still though.


thanx all