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STUMBLES,BACKFIRE, SURGE,ENGINELIGTH
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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>SALEENGTSPORT</b> <br /><small>Member # 6151</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(2007,1,21,20,17,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> ENGINE LIGHT 1993 GT FOXBODY<br />STUMBLES JERKS SOMETIME WHEN ENGINE GETS WARM RUNS BETTER THINK HAS SOMETHING TO DO WITH THE EGR NO FLOW.<br /><br />TROUBLE CODES: 33. 41. 66. 91. <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(2007,1,21,22,32,0), 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 SALEENGTSPORT:<br /><strong> ENGINE LIGHT 1993 GT FOXBODY<br />STUMBLES JERKS SOMETIME WHEN ENGINE GETS WARM RUNS BETTER THINK HAS SOMETHING TO DO WITH THE EGR NO FLOW.<br /><br />TROUBLE CODES: 33. 41. 66. 91. </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">33 is "EGR valve open not detected"<br />41 is "No HEGO switch detected always lean (right O2)<br />66 is "MAF or VAF below minimum voltage"<br />91 is "No HEGO switch detected (left O2)"<br /><br />Sounds like you have a few problems <img border="0" title="" alt="[Smile]" src="smile.gif" /> <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>CA FiveOh</b> <br /><small>Member # 7429</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(2007,1,21,23,12,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> I wouldn't worry all that much with the EGR code, but the MAF volts below minimum is one to worry about. Once you get that code, a check engine light will occur and the EEC will enter what's known as limp mode. In limp mode, timing is retarded, and fuel is based off a 'safe' table that is richer than normal. This is fairly common with calibrations of 42lb or larger, so if that is not the case for you then I would say that it's possible you have a bad MAF sensor. <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(2007,1,22,1,41,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Either hook up your O2's or change them and clean your MAF. <br /> </font> </td></tr> </table></td></tr></table> <br /> <br />
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