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Old 12-02-2006, 11:52 PM   #1
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Default coil trouble

hi all i have a bit of trouble and i checked the tech info section and didn't find the answer i was looking for so here it is. I have a problem with the bottom coil pack i pulled the wire off and was getting alot of spark and looked good the pulled the other off and little to no spark from the secon terminal. I thought this was a problem with the coil so i purchased a new coil and replaced it but it continues to do the same thing so i was hoping to get some suggestions

thanks
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Old 12-03-2006, 12:14 AM   #2
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Please elaborate on what you mean by good spark.... Did you allow the coil to arch out on the other things around it?

Using a multimeter set to ohms please check the resistance between those two towers (This is with the car off and not running)
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Old 12-03-2006, 12:15 AM   #3
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Check the spark plugs & wires.
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Old 12-03-2006, 12:24 AM   #4
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Maybe check this thread out. Boost and Lash helped me through this back in May. Some of it applies and some might not. The suggestions about checking the ground connections and cleaning your battery terminals might help. Also the mounting plate that your ecm bolts too. Might need to clean that. Good Luck.

http://www.bonnevilleclub.com/forum/...696&highlight=
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Old 12-03-2006, 12:32 AM   #5
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What is the specific problem that you are experiencing?
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Old 12-03-2006, 10:33 AM   #6
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Default Re: coil trouble

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Originally Posted by pdqSSEi
I have a problem with the bottom coil pack i pulled the wire off and was getting alot of spark and looked good the pulled the other off and little to no spark from the secon terminal.
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Old 12-03-2006, 11:22 AM   #7
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OK, let me re-word that. What symptoms are you experiencing that made you check the coil in the first place?

Edit - did you check the resistances as listed in techinfo? Did the readings match?

This is the description for the ignition coil system. The way the system works, which is different from most "normal" circuits and ignitions, I can see where you may get a different spark from each terminal, and that could differ from the next coil, car to car, and maybe even the same car on a different day. This can be cause by what the air is like around it, and what other parts are nearby. The following description explains how it all works.

Quote:
Conventional ignition coils have one end of the secondary winding connected to the engine ground. In this ignition system, neither end of the secondary winding is grounded. Instead, each end of a coil'* secondary winding is attached to a spark plug. Each cylinder is paired with the cylinder that is opposite (1/4, 2/5, 3/6). These 2 plugs are on companion cylinders and on top dead center at the same time. When the coil discharges, both plugs fire at the same time to complete the series circuit. The cylinder on compression is said to be the event cylinder and the one on exhaust is the waste cylinder. The cylinder on the exhaust stroke requires very little of the available energy to fire the spark plug. The remaining energy will be used as required by the cylinder on the compression stroke. The same process is repeated when the cylinders reverse roles. This method of ignition is called a waste spark ignition system.

Since the polarity of the ignition coil primary and secondary windings is fixed, one spark plug always fires with normal polarity and the companion plug fires with reverse polarity. This differs from a conventional ignition system that fires all the plugs with the same polarity. Because the ignition coil requires approximately 30 percent more voltage to fire a spark plug with reverse polarity, the ignition coil design is improved, with saturation time and primary current flow increased. This redesign of the system allows higher secondary voltage to be available from the ignition coils - more than 40 kilovolts (40,000 volts) at any engine RPM. The voltage required by each spark plug is determined by the polarity and the cylinder pressure. The cylinder on the compression stroke requires more voltage to fire the spark plug than the cylinder on the exhaust stroke. It is possible for one spark plug to fire even though a plug wire from the same coil may be disconnected from the companion plug. The disconnected plug wire acts as one plate of a capacitor, with the engine being the other plate. These 2 capacitor plates are charged as a spark jumps across the gap of the connected spark plug. The plates are then discharged as the secondary energy is dissipated in an oscillating current across the gap of the spark plug that is still connected. The secondary voltage requirements are very high with an open spark plug or spark plug wire. The ignition coil has enough reserve energy to fire the plug that is still connected at idle, but the coil may not fire the spark plug under high engine load. A more noticeable misfire may be evident under load. Both spark plugs may then be misfiring.
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