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89 pontiac 6000, no power at coil
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rawkdw
New User
Jun 20, 2006, 2:32 PM
Post #1 of 5
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89 pontiac 6000, no power at coil
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Hello
I have the 2.8 in this car and I have no spark in 2 cyls. that are powered from one of three coil packs.
I switched wires to a different pack and then they fired, so I know the pack thats not working.
I then replaced the coil pack with a new one but still had no spark. So I'm assuming no power is getting to that coil.
I'd like to know the next dianostic step I should take.
Thanks
Rick
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DanD
Veteran
/ Moderator
Jun 21, 2006, 12:05 AM
Post #2 of 5
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Re: 89 pontiac 6000, no power at coil
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You’ve done all the diagnostics that are needed; all three of the coils are fed power internally of the ignition module. With you switching coils around and the same cylinders are not firing you’ve proved it’s not the coil; change the module and you should be good to go.
Dan.
Canadian "EH"
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Guest
Anonymous Poster
Jun 21, 2006, 2:00 AM
Post #3 of 5
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Re: 89 pontiac 6000, no power at coil
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Dan,
Thanks for the reply. Will a bad module alow 2 of the three packs to work right but not the third?
Thanks,
Rick
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DanD
Veteran
/ Moderator
Jun 21, 2006, 5:47 AM
Post #4 of 5
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Re: 89 pontiac 6000, no power at coil
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Yes
I’m on holidays this week and don’t have access to my wiring diagrams so I can’t show you that there is only one power feed into the ignition module and coil pack assembly.
There is only one crankshaft sensor for the module and ECM to use for crankshaft position and it only sends/creates a signal at TDC (top dead centre) of #1 on compression stroke.
There is only one EST (electronic spark timing) line between the module and ECM.
There are more things that are common to all cylinders and if any of them were either open or shorted; you wouldn’t have spark at all coils.
Inside the ignition module is where each coil has its own driver (switch) and after the ECM has asked/told the module to fire #1 coil (EST) the module determines when to fire the remaining coil(s). So the module has either lost its ability to activate the driver or the driver itself has burnt out.
One last thing you should think about doing; that is to make sure the ignition wires and spark plugs are in good condition. Usually there is a reason for an ignition module to fail. If there is a bad Ignition wire (spark plug wire) and coil secondary voltage (80,000 to 120,000) can’t get to where it was designed to go; it can back feed and take out the module. Modules don’t like being zapped with high voltage. LOL
Come to think of it neither do I; Doctors only use something like 40,000 to 50,000 to stop and start your heart during an operation. So be careful not to get ZAPPED and burn out your driver.
Dan.
Canadian "EH"
(This post was edited by DanD on Jun 21, 2006, 5:52 AM)
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rawkdw
New User
Jun 21, 2006, 11:59 AM
Post #5 of 5
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Re: 89 pontiac 6000, no power at coil
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Hi Dan,
Thanks again!
Rick
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