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help with hesitation at wot
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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>1bdpone</b> <br /><small>Member # 6708</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(2007,8,21,0,18,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Here's the problem: The car has a bad hesitation when under a load at WOT. For example - going 55-60mph in 5th and I floor it, it will hesitate/mis bad. Back off the pedal just a tad and it's fine. I notice it in the following gears 3,4 & 5. If I'm going going fast (higher rpm's) there is no hesitatin at wot. E.G. 70mph+ in 5th and I floor it (no problem).<br /><br />My stang is stock except Ford Racing headers and Mac cold air intake.<br /><br />The following parts have been replaced in the last 5000 miles: fuel filter, spark plugs, cap/rotor, 9mm plug wires, distributor, TFI module, alt, MAP sensor, clutch, flywheel and cleaned the MAF, throttlebody, IAC and injectors.<br /><br />I am running out of ideas of what the problem is. Also, car gets 17-18mpg in town and 20-24 on the freeway. Also, passed smog just 2 months ago. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>SmokinLX</b> <br /><small>Member # 1684</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(2007,8,21,0,45,0), 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 1bdpone:<br /><strong> Here's the problem: The car has a bad hesitation when under a load at WOT. For example - going 55-60mph in 5th and I floor it, it will hesitate/mis bad. Back off the pedal just a tad and it's fine. I notice it in the following gears 3,4 & 5. If I'm going going fast (higher rpm's) there is no hesitatin at wot. E.G. 70mph+ in 5th and I floor it (no problem).<br /><br />My stang is stock except Ford Racing headers and Mac cold air intake.<br /><br />The following parts have been replaced in the last 5000 miles: fuel filter, spark plugs, cap/rotor, 9mm plug wires, distributor, TFI module, alt, MAP sensor, clutch, flywheel and cleaned the MAF, throttlebody, IAC and injectors.<br /><br />I am running out of ideas of what the problem is. Also, car gets 17-18mpg in town and 20-24 on the freeway. Also, passed smog just 2 months ago. </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">I would'nt think a near stock car fox make enough torque to pull out of a low RPM, full throttle, 5th gear hit. What would You expect it to do? 5th gear is for cruising on the freeway so You are not even giving the car a chance IMO. Now You say there is no problem when You select the rite gear 2nd, 3rd, 4th @ the rite RPM so why not just stick with that <img border="0" title="" alt="[Confused]" src="confused.gif" /> . If You were in a 700 rwhp/700rwtq fox You could get away with more but when You are nearly stock You have to pick Your gear's with care. I would also recommend a rear end gear change to give You more flexibility <img border="0" title="" alt="[Wink]" src="wink.gif" /> . <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>1bdpone</b> <br /><small>Member # 6708</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(2007,8,21,10,2,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> It does it in 3,4 and 5. I've owned 4 fox mustangs and non of them before this one has ever had this problem. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>F8LSN8K</b> <br /><small>Member # 7080</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(2007,8,21,16,4,0), 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 SmokinLX:<br /><strong> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by 1bdpone:<br /><strong> Here's the problem: The car has a bad hesitation when under a load at WOT. For example - going 55-60mph in 5th and I floor it, it will hesitate/mis bad. Back off the pedal just a tad and it's fine. I notice it in the following gears 3,4 & 5. If I'm going going fast (higher rpm's) there is no hesitatin at wot. E.G. 70mph+ in 5th and I floor it (no problem).<br /><br />My stang is stock except Ford Racing headers and Mac cold air intake.<br /><br />The following parts have been replaced in the last 5000 miles: fuel filter, spark plugs, cap/rotor, 9mm plug wires, distributor, TFI module, alt, MAP sensor, clutch, flywheel and cleaned the MAF, throttlebody, IAC and injectors.<br /><br />I am running out of ideas of what the problem is. Also, car gets 17-18mpg in town and 20-24 on the freeway. Also, passed smog just 2 months ago. </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">I would'nt think a near stock car fox make enough torque to pull out of a low RPM, full throttle, 5th gear hit. What would You expect it to do? 5th gear is for cruising on the freeway so You are not even giving the car a chance IMO. Now You say there is no problem when You select the rite gear 2nd, 3rd, 4th @ the rite RPM so why not just stick with that <img border="0" title="" alt="[Confused]" src="confused.gif" /> . If You were in a 700 rwhp/700rwtq fox You could get away with more but when You are nearly stock You have to pick Your gear's with care. I would also recommend a rear end gear change to give You more flexibility <img border="0" title="" alt="[Wink]" src="wink.gif" /> . </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">no matter what, it is not supposed to miss or sputter like that. i had the same problem, i changed the fuel filter, got iridium plugs, and taylor wires and it ran like a champ. anything coulda happened wthin those 5,000mi. maybe ur wires are gettin burned or too hot due to the headers and u dont know it. so i would change those three things again, and get some sleeves for the wires aswell i know its not cheap for all that, but worth a try<br /> <br /> <small>[ September 21, 2007, 04:07 PM: Message edited by: F8LSN8K ]</small> <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <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(2007,8,22,12,52,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Have you checked for engine codes? What did you gap your plugs at? Also, do you have any exhaust leaks? Have you tried adjusting your TPS? <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>1bdpone</b> <br /><small>Member # 6708</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(2007,8,23,20,21,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> I don't have any engine codes and my plug gap is set to stock gap (I don't remember off the top of my head what it is). I am going to check my TPS this week. I am also replacing my h-pipe and o2 sensors this week or next (when the new one arrives). I am also going to replace the plugs, cap/rotor and coil at the same time. <br /> </font> </td></tr> </table></td></tr></table> <br /> <br />
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