Downhill in 2nd, rpm's dropping - Nissan Armada Forum: Armada & Infiniti QX56 Forums
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post #1 of 4 (permalink) Old 07-05-2018, 11:01 PM Thread Starter
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Downhill in 2nd, rpm's dropping

Anyone know what's going on? MAF sensor? Throttle body?

Basically, going downhill, I manually shifted the transmission into 2nd so I didn't have to hit the brakes as much while following someone downhill. When my RPM's reached 1500-1700ish my tach started bouncing down to 500ish rpm and back up until I shifted back up to 3rd.

I'm curious if anyone has an idea what is going on. Haven't experienced this before in my Titan, so I am assuming this isn't normal behavior for my Armada either.

My 'Mada is a 2011 with 112k, already replaced plugs (NGK laser iridium), exhaust manifolds replaced about 70k, so I do have 40k on the new ones (OE equip as it was under warranty) already.

Last edited by Norcal Armada; 07-05-2018 at 11:04 PM. Reason: added info
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post #2 of 4 (permalink) Old 07-06-2018, 09:21 AM
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Difficult to say over the internet..

My first go to thing is to check the obd for any codes (even if no mil lamp).

Could be anything..

Petrol pump
Petrol lines
Hit pressure petrol pump
Coil pack issues
Dirty petrol on the tank
MAF (as you suggested)
Faulty harness sending erroneous data to the TCM
Etc etc etc etc ..

Can you go back down the same hill (or simliar) and see if you can reproduce the issue?

If you have not done so, I’d recommend resetting the ECM using ther key-on/off pedal press procedure that’s mentioned on this fourm (and the internet).
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post #3 of 4 (permalink) Old 07-06-2018, 11:47 AM
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You said the tach was bouncing, was the engine also dropping in speed? If so the truck must have been bucking pretty good.

If it was just the tach showing reduced rpms, I would suspect a bad 12v battery. Each time the battery on my truck has gone bad, erroneous readings from the gauges has been one of the first symptoms.

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Last edited by Campfamily; 07-06-2018 at 11:48 AM. Reason: Spelling
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post #4 of 4 (permalink) Old 07-07-2018, 04:56 AM
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When did you last change the gearbox oil?
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