Repair Manual Topic is solved

[geekmaster48]

My apologies' chitownV, I see you already gave me advice on VIDA-DICE. Thank you.

[chitownV]

The TCV is like $20-$35? So, cheap to try as it regulates the wastegate, thus the boost, should be clipped to your intake filter box. I can’t say for certain, but it’s one of those parts that over time start to get sticky and/or slow without notice. This is why it’s important to do the maintenance based on your mileage and age.

The timing belt should be done if it’s due. No questions about it. You might also want to remove the timing cover and inspect for any oil leaks, as the VVT hubs on the camshafts use oil pressure (will not throw code). If the previous owner used lower quality oil and long oil intervals, the VVT solenoids could be semi clogged. Removal and cleaning could help (get new gaskets, cheap), there are YouTube videos on this. This could be the intermittent VVT code.

Another part that won’t throw a code is the fuel filter. Should be replaced every 100k miles. Perhaps some clogging of the flow of fuel.

Notice the trend of things that can happen over time? It’s even more important if you don’t know the service history. This is why service based on a schedule, miles and time, are important. Some things won’t simply break, they wear down or will have reduced performance over time.

A bad timing belt would throw a code all the time and run rough. Being off by one tooth in timing will be very apparent.

[geekmaster48]

Hello chitownV, Again thank you for the response. I'll be heading up to my buddy's shop tomorrow and I will check into everything you suggested. Do you think problems with the VVT and or the TCV could throw the NO OIL PRESSURE-STOP IMMEDIATLY message? I'll be cleaning and replacing the gaskets for the VVT's and replacing the TCV regardless. And I agree with everything you said about the timing belt as far as throwing a code, running rough and probably needing replacement. Which I plan on doing as well. What do you think about the oil pump- is it bullet proof like they say? Is it possible the NO OIL PRESSURE message simply needs to be reset? And finally, regarding the VIDA-DICE. What is your opinion on the iCarsoft i906 or the iCarsoft V200 V2.0 Volvo/Saab diagnostic scanners? Pros/Cons? I really do appreciate your time and effort and input, helping me with this vehicle. Thank you.

[chitownV]

Hmm, without knowing your XC90 maintenance history and mileage, these are some things to consider with the oil pressure coming on once or twice,

1. Any carbon or sludge built up due to lower quality oils and extended oil change intervals. These may also block some of the oil pickup. I personally would do an oil change with a quality oil filter (Mann, Mahle, Wix) and good synthetic oil. I would use an A3/B4 oil, like Pennzoil Euro 0W-40 at 5k miles or less for an oil change interval. This will help reduce or prevent additional carbon and sludge. Inspect the old oil filter for any carbon, sludge, and/or media. If you do shorter oil change intervals, say less than 5k miles, that might be good as there could be loose carbon or sludge that goes into the filter.

2. It could be the oil pressure sender, such as if it is clogged or contaminated from carbon and poor quality oil. If you got the message once, look at #1.

3. There are o-ring kits for the oil pan. Sometimes this will need to be done.

There are a good amount of threads specifically on the 2.5t (and related engines) with the oil pressure issue. Those might provide additional info if you search.

I don’t personally have experience using those iCarsoft scanners so can’t give personal experience in them. Amazon reviews might bring more insight.

[geekmaster48]

Hi, thanks for the info. when the message first came up the first thing i did was replace all the PCV system parts, the oil pan O-rings and cleaned the pan and pick-up tube as well as all the holes, passageways, and crevices i could reach. while i was there i also replaced the oil pressure sender and blew out its opening with compressed air to make sure it wasn't clogged. i did an oil change at the same time with a quality filter and i am running Pennzoil euro 0W-40. I have read many, many, many threads on the oil pressure issues on a 2.5T engine and watched many a youtube video and i've pretty much done everything there is to do. However the no oil pressure message is the least of my worries now that the engine has taken a hard left turn. the loud engine clatter, no power and blue smoke are quite concerning. something suddenly changed that affected drivability in a big way.
and that really threw me for a loop cause i felt the engine was running pretty good prior to that. well im going to check/replace the things you suggested and go from there. i'll post the results- good, bad, or ugly. again thanks for your help.

[chitownV]

Oh wow. You did do a lot of work already. Don’t forget to double check work already done too.

Btw, for sh*ts and giggles, maybe remove the rear cam covers, cam sensors. Double check there isn’t any oil leaking there, since you had a cam position code.

Keep us updated.