OBD Codes P0090 & P0087 - 2011 QX56

[G-496715]

Should there be any resistance getting the bucket out or putting it back in?

 

[M56 Guy]

Should there be any resistance getting the bucket out or putting it back in?

The Valve/Lifter should be able to move freely up and down in the upper section that it is housed in the Timing Cover....there should not be any side-to-side movement....Mine had too much of a gap from wear in the timing cover where it is housed, so I ended up replacing my timing cover.

The Valve/Lifter should be able to move freely up and down in the upper section that it is housed in the Timing Cover....there should not be any side-to-side movement....Mine had too much of a gap from wear in the timing cover where it is housed, so I ended up replacing my timing cover.

I actually replaced pretty much everything after opening the timing cover.....
I replaced the following:

Bank 2 Oil Jet - part# 13081-AR000
$ 14.74 (InfinitiPartsDeal.com)
The oil jet has a couple of Verrrry tiny holes on it that allow oil to be directed to the timing chain and upon inspection, were clogged, thus preventing oil to the chain. Replaced for less than $ 15

High pressure pump camshaft assy-
Infiniti part# 13020-5ZM0E
$ 298.87 (InfinitiPartsDeal.com)

Timing cover filter assy
Infiniti part# 15200-EY00A
$ 93.18 (Southwest Houston Infiniti)

Timing chain guide (broken "bucket" fragments broke (1) guide
Infiniti part# 13085-1LA2A
Clear Lake (Houston) Infiniti
$ 28.79

Oil Jet Removal and Install tools
Jig-Oil Timing Infiniti Part# 13081-1LA0B
$ 100.00 total to remove oil jet
Infiniti PartsDeal.com

I also replaced all of the O-rings for the timing cover (I think a total of 6 or 7) total cost from Infiniti $ 200.00 (they were in stock and readily available...if I had to do it again I would have ordered from InfinitiPartsDeal.com and waited the 2-3 days to receive them as it would have been less than $ 50

Unfortunately my timing cover was damaged at the top portion where the high pressure pump mounts. The broken lifter-valve "bucket" fragments gouged the inner walls where the "bucket" rides, therefore creating excessive wear on the bucket. I was able to find a used timing cover in Canada "Doug's Auto Parts gor $ 139.36 USD..... waiting 7 days to receive....better than the $ 700 plus new from Infiniti.

With your situation for labor costs and amount of damage and possible additional damage if I were in your situation I would simply replace engine for $ 4k..... check Car-Part.com for engine prices or eBay....Call Danny at Nissan Unlimited in Houston, (832) 467-4400, ask for Danny or William, he is great to work with as he has provided me with good parts and prices for years for my Q45, M45, Qx56 and now my M56.

Hello Forum Brothers,

Quick update.....PO087, P0088, PO090...

After all of the aforementioned replacement parts.....timing chain, guides, high pressure pump, pump lifter/valve (bucket), pump camshaft, oil jets, timing cover, orings, gaskets......then flushed engine (4x) (4 complete oil changes) to remove any debris. After completion I got PO011 camshaft control solenoid codes, added "seafoam" and drove 200 miles, changed oil and all spark plugs and M56 runs better than when I bought it a few years ago.

Happy Camper
Now looking for HPS silicone intake tubes if anyone has a set for sale or know where to order.

 

[G-256064]

I called Infiniti consumer affairs 800 number, they confirmed that my VIN number does not fall within the recall. One of my first diagnosis was from Infiniti dealer and they recommended the low pressure pump which I replaced on my own. As you advised I will look into the timing chain by removing the high pressure pump looking for markings from a stretched chain. I will update tomorrow with the findings. Thank you.

Removed the high pressure pump again to double check and found the high pressure pump bucket worn and cracked causing low fuel pressure. Replaced the high pressure pump bucket $30.00 and reinstalled pump. Cleared codes so far the nightmare has ended.

How well did that go. Usually when your bucket has worn, the roller cam needs replacing too.