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Have a 2000 Nissan Maxima. recently did a tune up. changed…

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have a 2000 Nissan Maxima...
have a 2000 Nissan Maxima. recently did a tune up. changed all coil packs and all plugs. now have cylinder 5 misfire. all what i have done was to see which one was misfiring was removing each coil pack until the engine sound didn't change which indicates a bad coil pack (good coil pack caused a significant change in the engine idle). determined it was #5 so removed coil pack and spark plug and swapped with #3 but still #5 misfired. after further diagnosis i removed the connector from the coil and jiggled it a little and put it back the the car ran fine for a few minutes then started back misfiring on the cylinder intermittent then constant. remove the connector again and jiggled it again but still misfired but after a few minutes stopped misfiring. all of the diagnosis was done at idle please help ?
Submitted: 9 months ago.Category: Nissan
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Answered in 40 minutes by:
9/14/2017
Nissan Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 9 months ago
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Nissan
Satisfied Customers: 5,529
Experience: Owner at Carolina Auto Service & Sales , 20 years Experience in Foreign & Domestic vehicles
Verified
Hey how are you
You either have a bad injector ,intermjnet flow when it gets hot
Or the wiring to injector or the ground being pulses from the ecu
Now we can also have a bad wiring to the coils
Can we determine that the jiggle did or did not have effect in the coils .
What Is the mileage on it now
Did u check for vacum leaks
Intake gasket leaking ,we need to check but I doubt it ,since it is intermittent ,it will be wiring ,ecm or injector
Do u have a noid tester for injector to check ground pulse to it
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Nissan Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 9 months ago
Please let me know
Chad farhat
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Customer reply replied 9 months ago
When it is misfiring you notice the engine idle to be rough right? So I removed the connector from #5 the still had the rough idle. But when I removed the connector I jiggjed it and the vehicle ran smooth for about 5 min then it started back misfiring. Do you still think the injector is bad or the coil connection. Cause all this didn't start til after I did the tune up
Nissan Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 9 months ago
Well if that is the case I m going to see coil connector ,inpaextvpins get a flash light shine inside the connector and make sure u did not bend any pins on that coil connector
If all good check the coil wire from coil back to pcm ,unplug pcm and check connector there also
If all this did not happen until time up logic say go back and recheck ur work ,unless wire broke inside harness while u moveing the connectors doing the repair or the pcm driver Internall is defective
I see injector issue on high mileage one usually what is the mileage on it now
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Nissan Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 9 months ago
Did you buy like advance auto or auto zone coils or Ebay after market ones ?
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Customer reply replied 9 months ago
OE brand hatichi and 223000 miles on it
Nissan Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 9 months ago

ok great that rule coils out then that leaves wiring and ecu

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Nissan Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 9 months ago

now at 223 miles, i have seen injectors fails intermittently

before buying swap injectors and see if the #5 moves

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Nissan Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 9 months ago

You are very welcome :)

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