Possible pre ignition issue.. - Nissan Armada Forum: Armada & Infiniti QX56 Forums
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post #1 of 5 (permalink) Old 03-11-2013, 02:36 PM Thread Starter
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Possible pre ignition issue..

My 2009 Armada has for the last few weeks made a rattling sound when heavy accelerating or climbing a hill. It really only seems to happen around 2500 RPM and goes away fairly quickly. It does happen every time though. I also think it may be a little sluggish( but it could be in my head at this point) It idles fine(no rpm issues)
I have switched out to higher octane a couple of times with no improvements. I also have run Seafoam thru fuel tank. From waht I have been reading it sounds like a possible preignition problem. I am considering swapping out the plugs ( around 70,000 mi) My mpg is normal...

Any tips would be appreciated. Thanks
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post #2 of 5 (permalink) Old 03-11-2013, 07:21 PM Thread Starter
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Just as a follow up I called local dealer about pricing for some parts and parts guy offered some free advice... bring it in Anyways, he thinks it is the infamous cracked manifold. However I am still thinking a preignition issue. When the Armada is in the driveway I can push the gas pedal up and down and hear nothing different(clicking,popping etc). I can only reproduce the sound when it is under load and in the transistion stage(passing, climbing a hill) and it only lasts a second or two. I had it on the highway yesterday and even with the cruise set it was smooth unless it encountered a good sized hill.

I am going to take some plugs out tomorrow and take a look at them for any tell tale signs.

On a side note my wife had an Olds Alero which were notorious for intake manifold gasket failures. I can remember the distinctive clicking sound right from the start up in the a.m.


Thanks
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post #3 of 5 (permalink) Old 03-11-2013, 09:24 PM
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Re: Possible pre ignition issue..

I think he had the same problem and did a fix for it.

https://www.clubarmada.com/forums/sho...d.php?p=196459

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post #4 of 5 (permalink) Old 03-12-2013, 01:20 PM Thread Starter
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Thanks! Only real difference would be I get it when I hammer on the gas. It just seems like when it needs to quickly respond with some jam I get it for a second or two. Im taking a couple of plugs out today and see what they look like.
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post #5 of 5 (permalink) Old 04-18-2013, 06:35 PM Thread Starter
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Update!!

Cracked manifolds. I was lucky enough to have them repaired under the emissions warranty( 80,000 mi). Things are going much better now!

Thanks for everyones help

PS Only reason I pushed my local dealership re: emissions warranty was due to stumbling onto it here
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