Post A Reply
read DMs/my profile
login
|
join CAFords
|
search
|
faq
|
»
Northern California Ford Owners
»
Automotive
»
Tech Talk
»
MOTOR DECOMPRESSES plzhelp
» Post A Reply
Post A Reply
Login Name:
Password:
Message Icon:
Message:
HTML is not enabled.
UBB Code is enabled.
(
how?
)
Instant Emojis
Instant UBB Code
What is UBB Code?
Options
Disable smilies in this post.
<table border="0" cellpadding="1" cellspacing="1" width="99%" align="center"> <tr bgcolor="#000000"><td> <table border="0" width="100%" cellpadding="3" cellspacing="0"> <tr bgcolor="#000099"> <td colspan="2" align="left"> <font size="2" color="#ffffff" face="Verdana, Arial"> <b>T O P I C R E V I E W</b> </font></td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>LXman25thANNV.</b> <br /><small>Member # 5359</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2005,1,18,19,50,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> After installing a edelbrock lower and uper intake the motor will make a "decompressing sound" like its relieving pressure after i turn the car off. It runs perfectly and I am pretty sure there is no vacuum leak. What could be wrong???? <img border="0" title="" alt="[Confused]" src="confused.gif" /> <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>JohnB</b> <br /><small>Member # 969</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2005,1,18,20,16,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> You have a manifold leak; it is either at the head surface or upper to lower intake surface. Sounds like air blowing off, correct? maybe a slight whistle to it? <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>LXman25thANNV.</b> <br /><small>Member # 5359</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2005,1,18,21,0,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> yes,but it only does it right after i turn it off. could it be anything else? like maybe the pvc valve? or vavles that arent working correctly? it doesnt leak while its running-its almost like there is pressure building up in then moteor <img border="0" title="" alt="[Confused]" src="confused.gif" /> <img border="0" title="" alt="[Frown]" src="frown.gif" /> <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>BlackNGold</b> <br /><small>Member # 655</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2005,1,18,21,18,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Does this happen even when the car is warm?.... <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>LXman25thANNV.</b> <br /><small>Member # 5359</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2005,1,19,10,39,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> It only does it right after i turn the motor off. it could run for a only a sec or an hour and it will still do it. Could pressure be building up when the motor runs because of a bad pcv valve or something else??? does the manifold just run at a hegher pressure? I used the stock pcv valve even though the hole was alot bigger..good'ol duck tape <img border="0" title="" alt="[Roll Eyes]" src="rolleyes.gif" /> <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>AJBlackGT</b> <br /><small>Member # 3936</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2005,1,19,10,49,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Thats how a motor makes power, it buils pressure in the cylinders. You have pressure leaking from the cylinders somewhere it sounds like <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>LXman25thANNV.</b> <br /><small>Member # 5359</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2005,1,19,10,58,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> ................its not the cylinders-im not a total morron....but thanx for the idea <img border="0" title="" alt="[Smile]" src="smile.gif" /> <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Fostang</b> <br /><small>Member # 3752</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2005,1,19,11,18,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> If it aint broke don't fix it.<br /> <br /> <small>[ February 19, 2005, 11:19 AM: Message edited by: Fostang ]</small> <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>AJBlackGT</b> <br /><small>Member # 3936</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2005,1,19,11,49,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Yeah but the pressure left in the cylinder will leak back past an open intake valve when you stop the motor and it will make that sound... <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>LXman25thANNV.</b> <br /><small>Member # 5359</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2005,1,19,15,1,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> "if it aint broke dont fix it"........ <img border="0" alt="[BS flag]" title="" src="graemlins/bs_flag.gif" /> <br /><br /><br />what would that mean?-if it is leaking back out a valve? and why only after i install the manifold? <img border="0" title="" alt="[Confused]" src="confused.gif" /> <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>CDT</b> <br /><small>Member # 5004</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2005,1,20,14,58,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> try disconnecting any vacuum lines going to the climate controls.. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>LXman25thANNV.</b> <br /><small>Member # 5359</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2005,1,20,20,5,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> really? why? <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Gt88</b> <br /><small>Member # 4361</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2005,1,21,23,42,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Could be that your new "Chicks dig me" manifold is letting you hear a sound that the O.E. setup didnt- let's take stock:<br /><br />1: How is your car running after the upgrade?<br /><br />2: If #1 is 'BETTER!' or equivalent, maybe you might just let it be?<br /><br />A car with a manifold leak will let you know without a doubt- and, as you know, the piston that is moving on a compression stroke AFTER you turn off the key still has built compression, and that pressure has to go somewhere.<br /><br />I think you found out just how much noise suppresion the stock intake tract has built into it.<br /><br />Either way, just remember that the Honda guys pay big bucks to get the 'PSHSHSHSH' sound that you got for free, so cheer up!! <img border="0" title="" alt="[Big Grin]" src="biggrin.gif" /> <img border="0" title="" alt="[Big Grin]" src="biggrin.gif" /> <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Gt88</b> <br /><small>Member # 4361</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2005,1,21,23,46,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Oh, and to answer your question to CDT, he's trying to help you eliminate the vacuum bleedoff at the vacuum reservior to the A/C unit- check valves go bad, and a reservoir takes it's sweet time bleeding off 25 inches of stored vacuum!! <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>sic5pointSLOW</b> <br /><small>Member # 4347</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2005,1,22,2,40,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> i have a trickflow upper and lower and after installing it the car whistles and makes a air sound when u turn it off. my vac is at 22-20 and the motor runs fine. i e-mailed trick flow and bbk (i put a 70mm tb) and they both told me that its sometimes normal for this to happen. i had a friend with the same setup and his had the same sound but a lil louder. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>LXman25thANNV.</b> <br /><small>Member # 5359</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2005,1,22,15,35,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> It probably is normal then, i was just curios if any one else had that prob. thx for all the info. <img border="0" alt="[dance]" title="" src="graemlins/dance.gif" /> <img border="0" alt="[dance]" title="" src="graemlins/dance.gif" /> <img border="0" alt="[dance]" title="" src="graemlins/dance.gif" /> <img border="0" alt="[dance]" title="" src="graemlins/dance.gif" /> <br /> </font> </td></tr> </table></td></tr></table> <br /> <br />
Questions/Requests/Suggestions? email CAFords
Fueled by
Ford Mustang Owners
on CaliforniaFords.com
