Always keep the #5 and #7 wires routed away from each other. The cylinders are next to each other and they are so close to each other in the firing order that an inductive pulse from the #5 wire can cause a spark in the #7 cylinder, firing both 5 and 7 at the same time. Waay early for the #7 cylinder.
Bill Vander Werf ----- Original Message ----- From: "Tom Tomlinson" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, June 02, 2003 8:21 PM Subject: [Chevelle-List] Rich Edelbrock Carb > Last week I started up my 350 Malibu after installation of a new Edelbrock > 2701 intake manifold, 1405 carb, Sanderson headers. The good news is, there > are no external leaks of water, oil, or exhaust. The bad news is, after > adjusting dwell and timing, I find the car "pops" in the header when > accelerating and decelerating. I installed an O2 sensor to help with tuning, > and it's telling me the mixture is rich (O2 sensor reading > 900mv), so I > suspect extra gas is igniting in the header. I'm disappointed because the > intake/carb combo are supposed to be "matched" and run "right out of the > box". The engine has stock heads and ignition, and a modified cam of unknown > spec (the previous owner said "it was a 350 HP cam with nothing above 5k > rpm"). > > - Has anyone else noticed an overly rich 1405 upon initial installation? > - can the cam have a dramatic effect on A/F mixture? > - is there an easy way to check for ignition cross-fire (I made new plug > wires and they could be part of the problem). > > Tom Tomlinson > '71 Malibu ----------------------------------------------------- To Unsubscribe please visit www.chevelles.net/list.html To start a new topic, send mail to: [EMAIL PROTECTED]
