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cant get car to idle right
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<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>Adam5.0</b> <br /><small>Member # 6995</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(2008,2,17,20,11,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> i just put in a 306. I set fuel pressure a 40psi with no vacuum. I move the #1 piston to tdc and i cant get it to idle at the right speed without dying with the timing set at 10 degrees. when it is set at 10 it doesnt want to idle below at about 1000 rpm. i have adjusted the idle screw to get it to idle at the right speed the car will just die. the only way i can get it to idle is with the timing set at 0. with the timing set at 0 it does have a little bit of a surging problem. any input would help thanks. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Adam5.0</b> <br /><small>Member # 6995</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(2008,2,17,23,27,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> a little more info. the motor will surge from about 700 rpm to 1200 rpm then settle down at about 900 rpm then start surging again and then eventually stall. checked tps and IAC both checked out ok. <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>TOPnotch</b> <br /><small>Member # 1340</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(2008,2,18,1,25,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Vacuum leak <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>92stangLX</b> <br /><small>Member # 3252</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(2008,2,18,15,50,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by TOPnotch:<br /><strong> Vacuum leak </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">big one <img border="0" title="" alt="[Smile]" src="smile.gif" /> Check your upper to lower intake gasket and make sure it is seated properly. <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Adam5.0</b> <br /><small>Member # 6995</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(2008,2,18,22,15,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> double checked vacuum lines couldnt find anything. if it is a vacuum leak why would the idle be stable with base timing set at zero? <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>TOPnotch</b> <br /><small>Member # 1340</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(2008,2,19,2,16,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> The 5.0 cars tend to idle surge and do funny things when the tps voltage is out of range. If the car has an aftermarket cam you probably have the throttle blade open too far to get the car to idle and the tps voltage is over 1v Then you are compensating for it by retarding the timing. Put the initial timing off the crank back to 10 btdc thats where it should be. (with the spout connector un plugged of coarse) Adjust the idle and tps voltage from there. You will most likely have to slot the holes in the tps sensor to get it in range. You are looking for just under 1v at idle like .9 ect <br /><br />Try that if you haven't yet<br /><br /> <img border="0" alt="[patriot]" title="" src="graemlins/patriot.gif" /> <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Blind</b> <br /><small>Member # 3052</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(2008,2,19,3,35,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by Adam5.0:<br /><strong> double checked vacuum lines couldnt find anything. if it is a vacuum leak why would the idle be stable with base timing set at zero? </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">how much vacuum do you get at idle? <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Adam5.0</b> <br /><small>Member # 6995</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(2008,2,19,21,53,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> i have a tfs stage 1 cam with 1.7rr. i havent hooked a vacuum gauge to it yet. i gonna try to play with the idle screw and tps some more. thanks for the help <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>89saleen</b> <br /><small>Member # 3083</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(2008,2,20,0,58,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Check the Idle Air Bypass solenoid- aka IAB..(the thing on the side of the EGR spacer)first check to see if its clogged with carbon, second see if it has smooth operation and isnt sticky, also try unplugging it & see if it affects the surge. Ford does make a plate to adjust the airflow to it, but I made my own; I cut out a gasket with smaller air holes to meter the air.. seemed to help my surge. Ive found that the IAB dosent deal well with aftermarket cams. Good luck. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>BCINGUU</b> <br /><small>Member # 2397</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(2008,2,20,19,22,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Be careful tampering with that idle screw. It can be very difficult to reset to the factory setting if you ever want to do that, which you probably will once you solve your idle problem. <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Stan G</b> <br /><small>Member # 6226</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(2008,2,22,23,3,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> If you don't have a vacuum leak, <br /><br />I think you're supposed to :<br /><br />1. disconnect the battery, step on the brake 3 or <br /> 4 times to reset the ecu ,<br /> reconnect the battery<br />2 warm up the car <br />3 disconnect the iac<br />4 set the idle speed using the idle adjust<br /> screw.<br /><br />5 plug the iac back in .<br /><br />The computer will adapt after a while to what you set the idle to, but it may hunt for a while .<br /><br />I think mine took a few days till It worked ok <br /> </font> </td></tr> </table></td></tr></table> <br /> <br />
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