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2001 V70 2.4T Rough growling when accelerating / Volvo code ECM-644A Topic is solved

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prwood
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Re: 2001 V70 2.4T Rough growling when accelerating / Volvo code ECM-644A

Post by prwood »

jonesg wrote: Thu Jan 11, 2018 11:51 am
prwood wrote: Thu Jan 11, 2018 10:36 am So, this issue is still happening, and I'd like to get to the bottom of it.

The symptoms I'm currently seeing started on 10/30/2017 when I put the car back into service after replacing the oil seals. I had removed and reinstalled all of the timing components at that point. The symptoms include:

- Rough growling from engine during acceleration.
- Increased fuel consumption
- Relatively recent - on 12/26/2017 - Check engine light illuminated with OBDII code P0014 - B Camshaft Position Timing Over-Advanced or System Performance Bank 1 - If this was related to the work I did with the timing components on 10/30, not sure why it would take so long to get thrown.

I put the timeline up here if anyone cares to take a look and share your suggestions.

https://docs.google.com/document/d/15w1 ... sp=sharing
Run the cvvt live test in vida, it pointed me to an oil flow problem , old filter and wrong oil.
You never know.
How do you get to the cvvt live test?
Last edited by prwood on Mon Jan 15, 2018 9:49 am, edited 1 time in total.
Cars I've owned:
- 2015 to current: 2001 Volvo V70 2.4T; 2004 Honda Odyssey
- 2007 to 2015: 2002 Subaru Legacy L Wagon
- 2003 to 2016: 2001 Toyota Corolla LE
- 1999 to 2003: 1994 Toyota Camry LE
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Re: 2001 V70 2.4T Rough growling when accelerating

Post by jonesg »

prwood wrote: Sat Jan 13, 2018 11:16 am
jonesg wrote: Thu Jan 11, 2018 11:51 am
prwood wrote: Thu Jan 11, 2018 10:36 am So, this issue is still happening, and I'd like to get to the bottom of it.

The symptoms I'm currently seeing started on 10/30/2017 when I put the car back into service after replacing the oil seals. I had removed and reinstalled all of the timing components at that point. The symptoms include:

- Rough growling from engine during acceleration.
- Increased fuel consumption
- Relatively recent - on 12/26/2017 - Check engine light illuminated with OBDII code P0014 - B Camshaft Position Timing Over-Advanced or System Performance Bank 1 - If this was related to the work I did with the timing components on 10/30, not sure why it would take so long to get thrown.

I put the timeline up here if anyone cares to take a look and share your suggestions.

https://docs.google.com/document/d/15w1 ... sp=sharing
Run the cvvt live test in vida, it pointed me to an oil flow problem , old filter and wrong oil.
You never know.
How do you get to the cvvt live test?
I think I followed the fault code by clicking on it, read codes and click on it in the listing of codes. If you get to a drawing of the cvvt solenoid click on the drawing.

Have you watched this video
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prwood
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Re: 2001 V70 2.4T Rough growling when accelerating / Volvo code ECM-644A

Post by prwood »

I used Fault Trace to trace down the following code:

ECM-644A Camshaft reset valve - faulty position

I got to the point where there was an illustration of the camshaft adjust solenoid, but when I clicked on it, it just displayed an enlarged version of the illustration.

I did, however, bring up this screen by clicking on another illustration on the page, that of the "VCT-2000" test module:
Camshaft Adaptation.jpg
Not sure if this is the live CVVT test you were talking about, but it's the only thing I could find that seemed relevant. Since my adaptation values are all greater than 7 degrees, according to the above, this indicates there is a permanent fault. Going further into the fault trace, I got this screen:
Camshaft Adaptation Diagnosis.jpg
My values are between +8 and +20, but since I have not yet checked/adjusted the camshaft setting, it sounds like I'll need to do that first before I can confirm there's a defect in either the VVT hub or the solenoid.

Any other thoughts before I go and take the timing belt off again?
Last edited by prwood on Mon Jan 15, 2018 9:50 am, edited 1 time in total.
Cars I've owned:
- 2015 to current: 2001 Volvo V70 2.4T; 2004 Honda Odyssey
- 2007 to 2015: 2002 Subaru Legacy L Wagon
- 2003 to 2016: 2001 Toyota Corolla LE
- 1999 to 2003: 1994 Toyota Camry LE
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Re: 2001 V70 2.4T Rough growling when accelerating / Volvo code ECM-644A

Post by prwood »

Trying to work through logically before I pull anything apart, I did some quick math based on the number of teeth on the timing gear (42). I came up with:

42 teeth = 360 degrees
8.57 degrees per tooth
.12 teeth per degree

- the VVT hub is allowed to adjust the camshaft timing to +/- 7 degrees from its center position, or just shy of 1 tooth (.84)
- the current adjustment is advancing the camshaft +18 degrees from its center position, which is +11 degrees from the maximum acceptable valve, or 1.32 teeth further than it should be

Based on this, I think my next step should be to remove the front timing cover and rotate the crankshaft until all of the timing marks line up:
- If they don't line up, then adjust the timing gear as needed until the marks line up. It shouldn't need to move much more than one tooth.
- If they *do* line up, that must mean that exhaust camshaft gear and VVT hub are not aligned, in which case I'll also need to install the camshaft holding tool, then slacken off the bolts holding the exhaust camshaft sprocket to the VVT hub and readjust its position.
Last edited by prwood on Mon Jan 15, 2018 9:50 am, edited 1 time in total.
Cars I've owned:
- 2015 to current: 2001 Volvo V70 2.4T; 2004 Honda Odyssey
- 2007 to 2015: 2002 Subaru Legacy L Wagon
- 2003 to 2016: 2001 Toyota Corolla LE
- 1999 to 2003: 1994 Toyota Camry LE
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Re: Rough growling noise when accelerating

Post by abscate »

Peter...my Alldata says you install the exhaust cam belt 1 tooth off with the hub wound fully clockwise , could that be your one tooth slip?
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Re: Rough growling noise when accelerating

Post by prwood »

abscate wrote: Mon Jan 15, 2018 9:50 am Peter...my Alldata says you install the exhaust cam belt 1 tooth off with the hub wound fully clockwise , could that be your one tooth slip?
Could be. I think I may have installed it with the mark right on the nose. Either way it would probably benefit from taking off the belt and readjusting.
Cars I've owned:
- 2015 to current: 2001 Volvo V70 2.4T; 2004 Honda Odyssey
- 2007 to 2015: 2002 Subaru Legacy L Wagon
- 2003 to 2016: 2001 Toyota Corolla LE
- 1999 to 2003: 1994 Toyota Camry LE
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Re: Rough growling noise when accelerating

Post by abscate »

I made the same error on my TB and got a timing code about a day or two after finishing up. I’ll find the alldata text and post
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Re: Rough growling noise when accelerating

Post by prwood »

abscate wrote: Mon Jan 15, 2018 10:47 am I made the same error on my TB and got a timing code about a day or two after finishing up. I’ll find the alldata text and post
Already got it. Will have to re-read and re-re-read these instructions. Maybe I should have a helper hold on to the VVT unit to make sure it doesn't slip at all while I'm putting the belt on. I thought I did an okay job of holding it myself the last time, but maybe not. Realizing that being off by one tooth is such a big deal, I might be more finicky this time.
ALLDATAdiy.com Vehicle » Engine, Cooling and Exhaust » Engine » Variable Valve Timing Actuator » Adjustments wrote: Press the variable valve timing unit/timing gear pulley onto the camshaft. Install the center screw (1) that holds the variable valve timing unit to the camshaft. Do not tighten yet .
Slacken off, but do not remove the screws (2) which secure the timing gear pulley to the variable valve timing unit.
Position the upper timing cover.

Turn the timing gear pulley so that the screws at the oval holes are in the limit position. Continue turning clockwise until the timing gear pulley's marking is 1 tooth before the marking on the upper timing cover.

Check that the timing gear pulley is still in the limit position in the oval holes.
Tighten the center screw (1) in the VVT unit to 120 Nm .
Check that the variable valve timing unit does not rotate when tightening. Install the center plug and tighten to 35 Nm .
Install the belt pulley on the intake camshaft : Install the belt pulley on the intake camshaft with three screws; do not tighten yet .

Turn the timing gear pulley to the marking. Check that the markings on the timing gear pulley/intake camshaft and upper timing cover correspond.

Install the belt in the following order:

the belt pulley on the crankshaft
the idler pulley
cam wheel, intake camshaft
water pump
belt tensioner.

Turn the variable valve timing unit clockwise to the stop.

Note! Hold the VVT unit fixed in the limit position clockwise when the belt if fitted.

Check that the markings on the belt pulley and the upper timing cover align.

Fit the timing belt over the exhaust camshaft's cam wheel.

Tension the timing belt as follows:


Fix the belt tensioner center screw in position and turn the belt tensioner eccentric counterclockwise until the tensioner indicator passes the marked position.
Then turn the eccentric back so that the indicator reaches the marked position in relation to actual temperature.
At the same time, ensure that the center screw remains fixed. At 20°C/68°F, the indicator should be centered in the window.
If the indicator is not in the right position, the adjustment must be repeated.

Note! The variable valve timing unit must not be released from the limit position until after the timing gear pulleys have been tightened.

Tighten the screws (2) on the timing gear pulley for the exhaust camshaft to 10 Nm .
Tighten the screws on the timing gear pulley for the intake camshaft to 20 Nm .
Cars I've owned:
- 2015 to current: 2001 Volvo V70 2.4T; 2004 Honda Odyssey
- 2007 to 2015: 2002 Subaru Legacy L Wagon
- 2003 to 2016: 2001 Toyota Corolla LE
- 1999 to 2003: 1994 Toyota Camry LE
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Re: 2001 V70 2.4T Rough growling when accelerating / Volvo code ECM-644A

Post by abscate »

I think I have pictures of how many teeth were between the timing marks once done.

Done equals car starts and runs like 250 HP, no codes
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Re: 2001 V70 2.4T Rough growling when accelerating / Volvo code ECM-644A

Post by Rattnalle »

I found a picture of my cam gears pre-change but I'm not sure if it does much good since the angle is off. I took it mostly to remember the routing and then counted the teeth in between a few times to be sure. I've forgotten since though.
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