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Message: <blockquote data-quote="Orange 94" data-source="post: 1180004" data-attributes="member: 17635">This thread will cover some of the common problems with 4.6L V8 2V in the SN95. The information in this thread was provided by members of our community, thank you all that helped.If you have any questions after reading this thread please try using the  search bar located in the top right. Chances are there is already a  topic covering your exact question.After trying the search bar please feel free to start a thread in the  appropriate section for addition information. Our community is happy to  help!Lastly, if you have any corrections or addition information please post  it in this thread! I'll add the information to this first post!Thanks!1. Ticking lash adjuster.Solution: Buy a tool such as <a href="http://www.shopfreedomracing.com/2V-4V-V8-and-40L-SOHC-Valve-Spring-Compressor-ST-103.htm" target="_blank">http://www.shopfreedomracing.com/2V-4V-V8-and-40L-SOHC-Valve-Spring-Compressor-ST-103.htm</a>miss.mod.502. Coolant Leaks.The 2V intake manifold (notably the one with the plastic crossover) is use to cracking after a while.Mine cracked at about 110,000 miles near the thermostat housing.The newer intake manifolds (Post 01+) came with an aluminium crossover that was an ideal replacement.You can now also find the NPI version of the intake manifold with an aluminium crossover if you don't want to upgrade.This is the crossover:<img src="http://i.imgur.com/59PtRy5l.png" alt="" class="fr-fic fr-dii fr-draggable " style="" />And here is a comparison of the plastic vs. aluminium crossover:<img src="http://i.imgur.com/Ecghtwil.png" alt="" class="fr-fic fr-dii fr-draggable " style="" />Ferocious3. Hanging IdleThe 2V motors were known for a dreaded hanging idle when letting off the gas.This can sometimes be traced back to the IAC restrictor plate.To fix this issue just make a custom gasket that will restrict even more airflow from the IAC and your RPMs will drop noticeably faster.The plate is between the IAC motor and the plenum:<img src="http://i.imgur.com/Wmh0dJ2l.png" alt="" class="fr-fic fr-dii fr-draggable " style="" />Here is the difference between the stock plate and the one you should make/buy:[URL="http://i.imgur.com/nuxVrhAl.png%5b/IMG"]http://i.imgur.com/nuxVrhAl.png[/IMG[/URL]]Ferocious [B][SIZE=3]4.[/SIZE][/B] [B]NPI Top End[/B]If you have a 96-98 GT, you have what is known as a NPI motor. This means that your heads, cams, and intake are [B]non-performance improved[/B].In 1999, Ford revised their 2v engine for the mustang and freed up airflow by throwing on PI (performance improved) heads, cams, and intake. This gave the 2V an extra ~45 HP or so.Here's is a comparison of the top end parts:[IMG]http://i.imgur.com/fnvkzDal.pngHere are the specs on the cams:Cam Name: Intake | Exh | LSA | Overlap ----------------------------------------------------------------------------------------------------------Ford 92-98 2v: 0.480 | 0.480 | 115 | -42.0Â° Ford 99-04 2v: 0.505 | 0.531 | 115 | -25.5Â°----------------------------------------------------------------------------------------------------------The PI headswap is a cheap and rewarding swap for anyone with an NPI.Swapping PI parts onto your NPI motor will also bump up your compression and net you a few ponies.You can find writeups on the swap here:<a href="http://sn95forums.com/showthread.php?51-Truth-about-NPI-vs-PI" target="_blank">http://sn95forums.com/showthread.php...bout-NPI-vs-PI</a><a href="http://sn95forums.com/showthread.php?521-The-PI-Headswap-and-You" target="_blank">http://sn95forums.com/showthread.php...adswap-and-You</a><a href="http://sn95forums.com/showthread.php?8467-PI-Intake-PI-Cams-Install-How-To" target="_blank">http://sn95forums.com/showthread.php...Install-How-To</a><a href="http://mustangforums.com/forum/4-6l-1996-2004-modular-mustang/483407-best-pi-swap-write-up-all-you-need-to-know.html" target="_blank">http://mustangforums.com/forum/4-6l-...d-to-know.html</a><a href="http://www.allfordmustangs.com/forums/4-6l-tech/160636-pi-swap-write-up-1996-mustang-gt.html" target="_blank">http://www.allfordmustangs.com/forum...ustang-gt.html</a>Ferocious 5. Spark plug separating issues. <a href="http://fulltorque.com/pdf/Ford%20Technical%20Service%20Bulletin.pdf" target="_blank">http://fulltorque.com/pdf/Ford%20Tec...20Bulletin.pdf</a>miss.mod.50,nightfire6. Valve seals on 97 and back IIRC go bad around 120k milesslow90coupe7. Timing chain guides wear or breaknightfire,sn95jones</blockquote>