The typical multiple-coil ignition system may have one of several different configurations. On Chrysler, Toyota and many other imports, the coils are mounted directly over the spark plugs. Many of these are the thin “pencil” style coils that extend down into recessed wells in the engine’s valve covers. On other applications, such as GM’s Quad 2.2L Four, the individual coils are mounted in a cassette or carrier that positions the coils over the spark plugs. On late-model Corvette, Camaro and other V8s, a Coil Near Plug setup is used because the spark plugs protrude from the side of the cylinder head, and there isn’t room to mount a coil on the end of each plug. Here, the individual coils are mounted on the valve cover and attached to the plugs by short plug wires.

In most of the older distributorless ignition systems, an electronic module was part of the coil pack assembly and controlled the switching of the coils on and off. On most of the newer systems, the switching function is handled by the powertrain control module, though there may be some additional electronics and diodes built into the top of each coil. The PCM receives a basic timing signal from the crankshaft position sensor and sometimes a camshaft position sensor to determine engine speed, firing order and timing. It then looks at inputs from the throttle position sensor, airflow sensor, coolant sensor, MAP sensor and even the transmission to determine how much timing advance to give each plug. Most of today’s multi-coil ignition systems are capable of making timing adjustments between cylinder firings, which makes these systems very responsive and quick to adapt to changing engine loads and driving conditions.

posted by 64.222.110...

http://www.babcox.com/editorial/us/us20406.htm

• Ignition Cassette failure(Not covered by Wynn's Serv.?), Eric Boysen, Thu, 11 Mar 2004 13:49:42
  • Never mind!!!!, Eric Boysen, Fri, 12 Mar 2004 13:46:15
    • Here we come to save the day....nm, Mike Lynch , Sat, 13 Mar 2004 12:02:32
    • That's great!.........a question, boramiNYC, Fri, 12 Mar 2004 15:26:43
      • My daughter has used them-, Dick in Falls Church, Mon, 15 Mar 2004 07:47:26
      • Re: That's great!.........a question, Eric Boysen, Mon, 15 Mar 2004 06:57:25
  • In my book, it's an ignition module. You judge (m), 9to5, Fri, 12 Mar 2004 10:08:39 <-- Viewing This Message
    • OK, now I get to play plaintiff's attorney (m), 9to5, Fri, 12 Mar 2004 10:18:46
  • Re: Ignition Cassette failure(Not covered by Wynn's Serv.?), Eric Boysen, Fri, 12 Mar 2004 09:38:11
  • Re: Ignition Cassette failure(Not covered by Wynn's Serv.?), Liam, Thu, 11 Mar 2004 19:32:21
    • Re: Ignition Cassette failure(Not covered by Wynn's Serv.?), Eric B., Fri, 12 Mar 2004 09:53:53
  • Hmmm, I calculate approx. a $1360/hr labor rate, 9to5, Thu, 11 Mar 2004 16:34:18
  • $640!!!!!!!!!!! n/m, Dean, Thu, 11 Mar 2004 15:46:01
    • You heard of "plug 'n play" Saab calls it "plug 'n pay", 9to5, Thu, 11 Mar 2004 16:57:54
      • and after that it's "Plug and Pray", Cryptical, Thu, 11 Mar 2004 18:41:02
        • Oooops...., Cryptical, Thu, 11 Mar 2004 18:41:52
      • & we owners call it "plug 'n pray" :-), 9to5, Thu, 11 Mar 2004 16:59:03
  • Bumper to bumper vs named component..., Mike Lynch , Thu, 11 Mar 2004 14:33:54
    • how'd they get the price up so high?, TimBrown, Thu, 11 Mar 2004 16:00:09
      • Re: how'd they get the price up so high?, Eric Boysen, Fri, 12 Mar 2004 09:47:19
      • Re: how'd they get the price up so high?, dtech, Thu, 11 Mar 2004 18:37:43
      • What's the Tech 2 setup involve? Necessary?, 9to5, Thu, 11 Mar 2004 16:37:32
        • to clean up the error codes maybe... n/m, dip, Thu, 11 Mar 2004 16:41:35
          • ah so, good point. My thinking cap is in the laundry., LOL 9to5, Thu, 11 Mar 2004 16:47:27
  • it's a "wear item", search board for more info nm, dtech, Thu, 11 Mar 2004 14:10:39
    • of course it is, DW, Thu, 11 Mar 2004 16:02:38

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