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Surging on startup
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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>stangin'</b> <br /><small>Member # 514</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(2016,3,11,21,37,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> I'm working on my friend's '93 Notch that has a bad surging issue that I can't seem to cure.<br /><br />It has a stroker 347 with your standard HCI setup. The surging would only happen right after start up, cold or hot. It would jump to 1500, 2000, 2500, and finally idle like normal after about 30-40 seconds. It could idle for 10-15min with no issues at a sweet 800rpm. As soon as you shut it down and start it back up, it would go through the same routine. There is a check engine light for DTC 91 and 41.<br /><br />I did the idle reset, cleaned the IAC, replaced the ECT sensor, cleaned the maf sensor, and checked for vacuum leaks.<br /><br />I notice that the MAF sensor was a Ford unit mated to a C&L 73mm housing. I also noticed the blue top injectors which are 24lbers. I figured maybe the previous owner had a mismatched setup which was causing the surge.<br /><br /> <img src="http://i1201.photobucket.com/albums/bb343/SCS-Performance/B6E5E971-4A3B-4E5E-A6DD-CE42DCD17E9A_zpshdnjapsj.jpg" alt=" - " /><br /> <img src="http://i1201.photobucket.com/albums/bb343/SCS-Performance/D4065E42-33EB-4936-AD76-214EBC3F096B_zpsrpclktsw.jpg" alt=" - " /><br /><br />I was able to located a Pro-M 80mm maf setup for 24lb injectors. Switching to this new maf only made things worst. I'm open to any suggestions. <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(2016,3,11,22,15,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Get it dyno tuned with the proM.<br />Your MaF transfer functions are out of wack. <br /><br />You may mask it clocking the maf in various ways and making sure you don't have an open filter element. <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>70stang351w</b> <br /><small>Member # 9948</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(2016,3,12,11,2,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> What's a standard HCI setup? just wondering <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>SacStangDriver</b> <br /><small>Member # 8304</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(2016,3,12,20,39,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> tuning it will get rid of the surging issue. its common on HCI <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>stangin'</b> <br /><small>Member # 514</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(2016,3,12,21,10,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> The HCI consist of the TFS top end kit with their stage 1 cam.<br /><br />It's currently running a BBK fenderwell CAI with the C&L unit. The Pro-m 80mm unit has the huge filter which doesn't mate very well with the BBK elbow.<br /><br />I tried clocking the MAF today and it only made things worst so I left it back with the sensor directly on top.<br /><br />Do you guys have a recommended tuner in the Bay Area? <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(2016,3,12,22,44,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Not in the bay but Nate I hold in high regard. <br /><br /><a href="https://starkweatherperformance.com" target="_blank">https://starkweatherperformance.com</a> <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>phildog</b> <br /><small>Member # 1214</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(2016,3,13,12,7,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Maybe try one of the idle air control adjustment plates, that go in between the IAC and the throttle body. It's a Ford product designed to solve idle issues. Last time I checked it cost about $50. <br /><br />The IAC itself may be sticking as well. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>stangin'</b> <br /><small>Member # 514</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(2016,3,13,12,12,0), 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 phildog:<br /><strong> Maybe try one of the idle air control adjustment plates, that go in between the IAC and the throttle body. It's a Ford product designed to solve idle issues. Last time I checked it cost about $50. <br /><br />The IAC itself may be sticking as well. </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">I think that the IAC is functioning properly b/c when I disconnect it, the idle drops low and once plugged in it idles great. I believe the previous owner replaced it b/c the unit itself looks very new. <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>stangin'</b> <br /><small>Member # 514</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(2016,3,13,12,13,0), 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 Fostang:<br /><strong> Not in the bay but Nate I hold in high regard. <br /><br /> <a href="https://starkweatherperformance.com" target="_blank">https://starkweatherperformance.com</a> </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">Thanks, we'll check them out for sure. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>LXjames</b> <br /><small>Member # 10791</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(2016,3,13,14,50,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> If your running the cai with no fender portion I've heard c&l mafs don't like being filter mounted for some reason <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>92_5.0</b> <br /><small>Member # 7624</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(2016,3,13,15,1,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> The ford unit is fine to use with the C&L housing as long as the sample tube inside the C&L is calibrated for the injectors. I have used that same 73mm in the past with 42 lb injectors and had no issues. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>kuku93</b> <br /><small>Member # 14014</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(2016,4,21,14,13,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> The injectors could be the issue. I was told with a 347 stroker not to use 24lbs but to use 42lbs. Try switching them up <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>ed650</b> <br /><small>Member # 9897</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(2016,4,22,16,46,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> 24s too small for a 347 you need at least 36s <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Martinna</b> <br /><small>Member # 12493</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(2016,4,23,23,47,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> On modified EEC-IV motors it's common for the lower end of the MAF curve to need adjustment. 24 lbs injectors will support 325-350 flywheel HP on a NA motor. 30lbs injectors 400-450 flywheel. 36lbs 500 to 550HP flywheel. The EEC needs to be calibrated to spray less fuel during cranking when using larger injectors. When too much fuel gets sprayed when cranking, it can cause a big RPM surge on fireup that can cause an over correction and surging. <br /> </font> </td></tr> </table></td></tr></table> <br /> <br />
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