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milling machine
User
Dec 14, 2014, 3:18 PM
Post #1 of 4
(1895 views)
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I have a 2006 Nissan maxima 3.5 There is nothing wrong with it but I was wondering how would you
test for a bad coil on a cop system that has the bank one coils buried under the intake manifold
there seems to be no way to get to them unless you take off the intake --I know the normal way
to test for them power balance test just lifting each one up listening for a change in rpm
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 14, 2014, 4:11 PM
Post #2 of 4
(1884 views)
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Re: TESTING COILS
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No, that's not the normal way. That's the way you burn out components. The normal way is to monitor misfire counts with a scan tool, current ramp the feed wires or use an inductive tool that reads the firing pattern externally.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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milling machine
User
Dec 14, 2014, 4:36 PM
Post #3 of 4
(1880 views)
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Re: TESTING COILS
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Thanks for the answer
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Discretesignals
Ultimate Carjunky
/ Moderator
Dec 17, 2014, 6:34 PM
Post #4 of 4
(1845 views)
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Re: TESTING COILS
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Sometimes current ramping the primary will yield something going on, but if you have something going on in the secondary side of the coil you might not see it looking at coil current. If the coil has the igniter built into it, you cannot see see the primary voltage because you have no way of accessing the circuit making it even worse in figuring out if a coil has an issue that is hiding under an intake. To save a lot of heart ache on vehicles that have COPs under intakes is to replace all the ones under the intake if you find one that is faulty.
There is also a TSB on your vehicle that may apply:
Classification: EC06-008
Reference: NTB06-075
Date: November 1, 2006
DTC P0300 STORED AND IGNITION COILS BLISTERED
APPLIED VEHICLES: 2004-2006 Maxima (A34)
2004-2007 Quest (V42)
2004-2006 Altima (L31) with VQ35 engine.
IF YOU CONFIRM
DTC P0300 is stored in the ECM,
and
One or more ignition coils are blistered / melted,
NOTE:
The customer may report one or more of the following:
^ Hesitates on acceleration
^ Rough running engine
^ Engine cranks but will not start
ACTIONS
1. Inspect the negative battery cable at the transmission end.
2. If the negative cable checks NG:
^ Replace the negative battery cable.
^ Inspect and replace as needed each ignition coil.
^ Make sure the engine operates normally and no DTCs are stored.
NOTE:
If the negative battery cable is OK, this bulletin does not apply. Refer to ASIST for further diagnostic and repair information.
IMPORTANT:
The purpose of "ACTIONS" (above) is to give you a quick idea of the work you will be performing. You MUST closely follow the entire Service Procedure as it contains information that is essential to successfully completing the repair.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Dec 17, 2014, 6:58 PM)
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