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Stock tachometer bouncing up and down?!?!
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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>S281 #314.... AKA SydeWayzSix</b> <br /><small>Member # 3596</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(2008,8,2,14,54,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> I noticed this morning that my stock tach is acting up. Sometimes it'll get stuck, then all of a sudden jump up to the correct RPM, then fall back down, etc...<br /><br />It seems to be fine when cruising down the freeway, but off the line and at lower speeds it jumps around.<br /><br />The only thind I did this weekend was change my spark plug wires and hose down the engine...could I have messed up a wire or something? <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(2008,8,2,17,48,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Could be a few things. The internals of the tach may be gummed up causing the needle to actually stick (you could try swapping tachs). Could be a loose wire, or perhaps the fuse connection is flaky (may be rusted, try jiggling or replacing the fuse). <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>S281 #314.... AKA SydeWayzSix</b> <br /><small>Member # 3596</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(2008,8,3,2,18,0), 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 BCINGUU:<br /><strong> Could be a few things. The internals of the tach may be gummed up causing the needle to actually stick (you could try swapping tachs). Could be a loose wire, or perhaps the fuse connection is flaky (may be rusted, try jiggling or replacing the fuse). </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">which wire could be loose? Is it under the hood? <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(2008,8,4,17,38,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> I believe the tach signal comes directly from the PCM, so it would just be a wire under the dash. Have to look at a wiring diagram to see which one it is. I think it's more likely to be a rusty fuse connection or gummed up tach though. <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>josesiphone</b> <br /><small>Member # 8693</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(2008,9,13,4,27,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> tach signal come from the ignition coil. Stock gauges aren't reliable so yours might be going out.<br /> <br /> <small>[ October 13, 2008, 04:28 AM: Message edited by: josesiphone ]</small> <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>whitelx91</b> <br /><small>Member # 8317</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(2008,9,14,13,42,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Definately wiring somewhere or tach sticking pretty common. Check the wiring coming off the pcm to the coils, PIN 48 on the ecu is the tach output check that going to the dash as well. Good luck.<br /><br />SuistangS <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>foxstang</b> <br /><small>Member # 7447</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(2008,9,15,16,19,0), 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 BCINGUU:<br /><strong> Could be a few things. The internals of the tach may be gummed up causing the needle to actually stick (you could try swapping tachs). Could be a loose wire, or perhaps the fuse connection is flaky (may be rusted, try jiggling or replacing the fuse). </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">WOULD IT BE THE SAME IF IT STOPPED WORKING AFTER 4OOORPM? CUZ MINE DOES THAT <img border="0" title="" alt="[Confused]" src="confused.gif" /><br /> <br /> <small>[ October 15, 2008, 04:38 PM: Message edited by: foxstang ]</small> <br /> </font> </td></tr> </table></td></tr></table> <br /> <br />
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