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GC 2001 - spark plugs & power rail
We were recently investigating the engine area
of our 2001 Jeep Grand Cherokee, and noticed the spark plugs (4L 6cyl) are connected with a power rail and what appears to be small wires to each plug. I looked around, but could not find an article showing how this has replaced the plug & ignition wire ? Any photos or explanations of the power rail vs traditional ignition setups. |
Re: GC 2001 - spark plugs & power rail
OPERATION
The 4.0L 6-cylinder engine uses a one-piece coil rail containing three independent coils. Although cylinder firing order is the same as 4.0L engines of previous years, spark plug firing is not. The 3 coils dualfire the spark plugs on cylinders 1-6, 2-5 and/or 3-4. When one cylinder is being fired (on compression stroke), the spark to the opposite cylinder is being wasted (on exhaust stroke). The one-piece coil bolts directly to the cylinder head. Rubber boots seal the secondary terminal ends of the coils to the top of all 6 spark plugs. One electrical connector (located at the rear end of the coil rail) is used for all three coils. Because of coil design, spark plug cables (secondary cables) are not used on either engine. A distributor is not used with either the 4.0L or 4.7L engines. The ignition system is controlled by the powertrain control module (PCM) on all engines. The ignition system consists of: Spark Plugs Ignition Coil(s) Powertrain Control Module (PCM) Crankshaft Position Sensor Camshaft Position Sensor The MAP, TPS, IAC and ECT also have an effect on the control of the ignition system. "Phil Schuman" <pschuman_NO_SPAM_ME@interserv.com> wrote in message news:j4d7g.67317$_S7.65364@newssvr14.news.prodigy. com... > We were recently investigating the engine area > of our 2001 Jeep Grand Cherokee, > and noticed the spark plugs (4L 6cyl) > are connected with a power rail and > what appears to be small wires to each plug. > > I looked around, but could not find an article > showing how this has replaced the plug & ignition wire ? > > Any photos or explanations of the power rail > vs traditional ignition setups. > > |
Re: GC 2001 - spark plugs & power rail
OPERATION
The 4.0L 6-cylinder engine uses a one-piece coil rail containing three independent coils. Although cylinder firing order is the same as 4.0L engines of previous years, spark plug firing is not. The 3 coils dualfire the spark plugs on cylinders 1-6, 2-5 and/or 3-4. When one cylinder is being fired (on compression stroke), the spark to the opposite cylinder is being wasted (on exhaust stroke). The one-piece coil bolts directly to the cylinder head. Rubber boots seal the secondary terminal ends of the coils to the top of all 6 spark plugs. One electrical connector (located at the rear end of the coil rail) is used for all three coils. Because of coil design, spark plug cables (secondary cables) are not used on either engine. A distributor is not used with either the 4.0L or 4.7L engines. The ignition system is controlled by the powertrain control module (PCM) on all engines. The ignition system consists of: Spark Plugs Ignition Coil(s) Powertrain Control Module (PCM) Crankshaft Position Sensor Camshaft Position Sensor The MAP, TPS, IAC and ECT also have an effect on the control of the ignition system. "Phil Schuman" <pschuman_NO_SPAM_ME@interserv.com> wrote in message news:j4d7g.67317$_S7.65364@newssvr14.news.prodigy. com... > We were recently investigating the engine area > of our 2001 Jeep Grand Cherokee, > and noticed the spark plugs (4L 6cyl) > are connected with a power rail and > what appears to be small wires to each plug. > > I looked around, but could not find an article > showing how this has replaced the plug & ignition wire ? > > Any photos or explanations of the power rail > vs traditional ignition setups. > > |
Re: GC 2001 - spark plugs & power rail
OPERATION
The 4.0L 6-cylinder engine uses a one-piece coil rail containing three independent coils. Although cylinder firing order is the same as 4.0L engines of previous years, spark plug firing is not. The 3 coils dualfire the spark plugs on cylinders 1-6, 2-5 and/or 3-4. When one cylinder is being fired (on compression stroke), the spark to the opposite cylinder is being wasted (on exhaust stroke). The one-piece coil bolts directly to the cylinder head. Rubber boots seal the secondary terminal ends of the coils to the top of all 6 spark plugs. One electrical connector (located at the rear end of the coil rail) is used for all three coils. Because of coil design, spark plug cables (secondary cables) are not used on either engine. A distributor is not used with either the 4.0L or 4.7L engines. The ignition system is controlled by the powertrain control module (PCM) on all engines. The ignition system consists of: Spark Plugs Ignition Coil(s) Powertrain Control Module (PCM) Crankshaft Position Sensor Camshaft Position Sensor The MAP, TPS, IAC and ECT also have an effect on the control of the ignition system. "Phil Schuman" <pschuman_NO_SPAM_ME@interserv.com> wrote in message news:j4d7g.67317$_S7.65364@newssvr14.news.prodigy. com... > We were recently investigating the engine area > of our 2001 Jeep Grand Cherokee, > and noticed the spark plugs (4L 6cyl) > are connected with a power rail and > what appears to be small wires to each plug. > > I looked around, but could not find an article > showing how this has replaced the plug & ignition wire ? > > Any photos or explanations of the power rail > vs traditional ignition setups. > > |
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