2000 V70R loss of power, P0014 P0015 P0422 codes

choogenboom · Post by **choogenboom** » 28 May 2014, 08:19

Hi All,
I am looking for help/direction with the following set of clues:

2000 V70R 165K miles
timing belt + idler pulley replaced at 100K, timing belt idler seized at 130K, timing belt broke and the meaning of "interference head" was driven home. Head rebuilt. Replaced all vacuum hoses to/from Turbo, O2 sensors, and water pump.
Loss of power coincident with pre-detonation/knock which suddenly "fixes itself" and then the car takes off like a rocket. Seems to be worse in warm weather and better in cold weather.
replaced crank position sensor (found some metal "fur" magnetically stuck to old CPS)
checked and double checked timing belt alignment
have NOT replaced cam position sensor
the VVT hub on the exhaust cam is a little "sticky" so its possible its not moving as it should be, although I am scratching my head how that translates into pre-detonation.

I am considering the ECU as it (1) controls timing and (2) is electronic which could explain the temperature sensitivity.

Thoughts and guesses?

Post by **jblackburn** » 28 May 2014, 10:43

The codes would be consistent with a sticky VVT phaser if you notice that. It does alter valve/ignition timing at the low end for fuel efficiency/power delivery, and if that's sticking up and not moving back to where it should be, it would definitely cause a knock or stumble. Are the oil passages to the valve clear?

choogenboom · Post by **choogenboom** » 29 May 2014, 08:11

Thanks for your reply.

"Are the oil passages to the valve clear?"

I don't know. How would I check that, and if they were not clear how would I clear them?

Post by **jblackburn** » 29 May 2014, 08:21

https://www.matthewsvolvosite.com/forums ... =1&t=21162

When you remove the CVVT solenoid, you'll be able to see if it's all gunked up in there.

With the absence of the P1332 code though, I am thinking the solenoid is working as it should, but perhaps the hub isn't rotating.

choogenboom · Post by **choogenboom** » 29 May 2014, 08:49

jblackburn wrote:https://www.matthewsvolvosite.com/forums ... =1&t=21162

When you remove the CVVT solenoid, you'll be able to see if it's all gunked up in there.

With the absence of the P1332 code though, I am thinking the solenoid is working as it should, but perhaps the hub isn't rotating.

That would be consistent with what I felt when I had the belt off and was rotating by hand. It would catch/stick as if there was dirt in it enough that when trying to rotate it to the stop it would catch and drag the cam with it. I had to hold the center bolt to get it to the stop without moving the cam.

Which brings me to a possible test/solution. I have read others on this forum that simply disconnect the VVT solenoid. Is that a solution or a way to test/verify that the VVT hub itself is faulty?

Post by **jimmy57** » 29 May 2014, 09:11

There is a test in VIDA. IF you can get to vida then the test in Vehicle Communications/ECM/Advanced tab/Camshaft Quick Test

This test is done with engine running at high idle and the cam is commanded to its end points in the controlled range and the desired and actual are graphed. If the CVVT hub is good them the graph line for it will more or less follow the desired line graphed. There should be wild swings, especially a delayed response from CVVT followed by it over-advancing or over retarding depending on the phase of the test.