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Author Topic: Need Help......Back Firing Night Ryder ¯ Member # 912 posted                              I notice when I shift at high RPM's my car back fires what causes this to happen?I had a fuel pressure regulator installed and it still back fires.I have a 2000 GT motor with some bolt ons. -------------------- 96 GT Convertible "SOUTH BAY STANGS" Posts: 626 | From: San Jose | Registered: Feb 2002  |  : Elapid GOROBGO Member # 50 posted                                 you may be running too lean/rich, or have an exhaust leak... [ January 06, 2003, 10:45 AM: Message edited by: rob ] -------------------- 98 Cobra 83 Notch rolling chassis - fs Posts: 1797 | From: Grass Valley, CA USA | Registered: Jul 2000  |  : BlackNGold CaliforniaFords.com Moderator Member # 655 posted                              Whats your fuel pressure?..Do you have a timming adjuster?..Any exhaust leaks will make your car backfire..My car used to do that all the time..As soon as I took off my smog pump it cured the problem (I probably had a bad diverter valve on the smog hoses)... -------------------- -SLOWER TRAFFIC KEEP RIGHT- Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001  |  : Elapid GOROBGO Member # 50 posted                                 did you put the vacuum line back on the fuel pressure regulator? check pressure with the vacuum line off, then make sure it is replaced before driving the car. -------------------- 98 Cobra 83 Notch rolling chassis - fs Posts: 1797 | From: Grass Valley, CA USA | Registered: Jul 2000  |  : Night Ryder ¯ Member # 912 posted                              I don't think I have an exhaust leak I checked it already plus I had someone else look at it.The fuel pressure is set at I beleive 41 or 42psi.The vacuum hose is connected.If the car is running to rich or too lean what can I do to fix it? -------------------- 96 GT Convertible "SOUTH BAY STANGS" Posts: 626 | From: San Jose | Registered: Feb 2002  |  : BlackNGold CaliforniaFords.com Moderator Member # 655 posted                              Disconnect the vacuum line to the FPR and plug it, then check the fuel pressure guage.....Try starting off a little leaner at 39 psi(assuming you have stock timming)...See if that helps..If you start hearing detonation up the fuel pressure a couple psi......The best way to see if you're runnig rich or lean is to check your spark plugs..(white=lean)&(dark with carbon deposits)...Hope I could help.. -------------------- -SLOWER TRAFFIC KEEP RIGHT- Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001  |  : Night Ryder ¯ Member # 912 posted                              Thanks guy's for the help -------------------- 96 GT Convertible "SOUTH BAY STANGS" Posts: 626 | From: San Jose | Registered: Feb 2002  |  :

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