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Author Topic: Car is backfiring around 4000rpms.. AL STOCK Its All Stock Cuzzon Member # 1852 posted                                 So everytime i punch it hard the car backfires and loses power around 4000rpms then regains power around 4800rpms... When i say loses power, it feels like the car wants to move but the backfire is holding it back..Backfires about 2-3 times then starts gaining power...This happens when car is warmed up but hardly happens in cold conditions.. What can this be? Spark Plugs? Air Filter? Exhuast? Thanks David -------------------- .:: FANATICS ::. 93 Cobra Teal 93 Cobra V Red 90 SSP SVT Raptor Huracan Rosso Mars E63s W213 Selenite Gray C7Z M7 Daytona Sunrise Posts: 6498 | From: San Bruno | Registered: Sep 2002  |  : 2stangs69-91 ¯ Member # 1951 posted                              my guess would be wires,also plugs. -------------------- 69 Mustang on hold 1991 LX hatch getting a make over 1994 F150 4X4 351 2006 Yamaha V-max 1200 Modded Posts: 3711 | From: Redding | Registered: Oct 2002  |  : FasterDamnit Bad Attitude Member # 442 posted                                 WHen your motor is cold you are running in open loop- not looking at O2 sensors. Once warmed up you go into closed loop. WOT also goes into open loop, but I believe the fuel tables are different between cold operation and normal operating temp. Sure your fuel pressure is right? Posts: 2971 | From: NorCal | Registered: Sep 2001  |  : BlackNGold CaliforniaFords.com Moderator Member # 655 posted                              If its an exhaust backfire, check for an exhaust leak or a faulty air injection diverter valve... -------------------- -SLOWER TRAFFIC KEEP RIGHT- Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001  |  : AL STOCK Its All Stock Cuzzon Member # 1852 posted                                 Damm i hate exhuast leaks! Im gonna get underneath and retighten every exhuast bolt.. Also gonna throw in new spark plugs since my wires are still new.. My plugs were last changed about 8K miles ago - Yeah my fuel pressure is right. Still stock lol -------------------- .:: FANATICS ::. 93 Cobra Teal 93 Cobra V Red 90 SSP SVT Raptor Huracan Rosso Mars E63s W213 Selenite Gray C7Z M7 Daytona Sunrise Posts: 6498 | From: San Bruno | Registered: Sep 2002  |  :

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