Author Topic: Noisy chain / knocking  (Read 705 times)

carrera

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Re: Noisy chain / knocking
« Reply #30 on: 04 December 2018, 12:45:31 AM »
Another evenings reading (including some things called a Volvo) and I'm better informed

The thermistor is located within the valve body, not externally accessible, and according to page 11 of the pdf linked below, at 10 degrees C the expected value is 6445 ohms, pretty close to the 6416 ohms my meter said.

So, that's that theory out of the window, also meaning of course that the test values in WIS are incorrect, but the component referred to is only present in the earlier 4 speed boxes, so perhaps a different thermistor / response profile.

https://www.myvolvolibrary.info/Tech_files2_ficheiros/AW55-50%20SN.pdf

That means tomorrow should be a chance to do the line pressures. Could be fun  :o
9-5 Aero Estates, 2002 Cosmic Blue, 2002 Steel Grey, 2003 Graphite Green, 2003 9-5 Glacier Blue 2.0 saloon

carrera

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Re: Noisy chain / knocking
« Reply #31 on: 04 December 2018, 08:26:19 AM »
Some more references for other forum users

Link for the earlier 4 speed box - thermistor resistor readings agree with WIS, so the values in WIS only apply to the early box

http://www.vectra-club.ru/images4faq/ova/AKPP/50-42LE.pdf

A pretty detailed set of test procedures for the 5 speed

https://www.sonnax.com/tech_resources/196-aw-55-50-af23-33-diagnosis-and-valve-body-information
« Last Edit: 04 December 2018, 10:39:30 AM by carrera »
9-5 Aero Estates, 2002 Cosmic Blue, 2002 Steel Grey, 2003 Graphite Green, 2003 9-5 Glacier Blue 2.0 saloon

carrera

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Re: Noisy chain / knocking
« Reply #32 on: 04 December 2018, 04:23:16 PM »
The system presures have been tested according to WIS at port B5.

When the car is started it shows about 5 bar in P, and within about 10 seconds it suddenly goes up to a solid 15 bar. When cold it throws P0748

Increasing the revs results in a slight increase in pressure, next the designated tests

Idling speed - 850rpm
In drive, 0 bar actual, 4 bar spec
In reverse, 15 bar actual, 5 bar spec

Stalling speed - 2400rpm
In drive, 0 bar actual, 13 bar spec
In reverse, 20 bar actual, 20 bar spec

The guidance in WIS doesn't fit this pattern, so more thinking to do, though the low pressure in D in both situations does point to "too low system pressure, fault in clutch C1"

I have found a TCU, but am not yet satisfied that is the fault. What is certain is that I am methodically getting way out of my depth  ;D


****

a bit more data, I decided to measure the pressure on the SLT, another reference document gave some typical values, though I have to convert from psi every time

Idle speed, actual value 5 bar, 0.3 bar spec
Stalling speed, actual value, 5 bar, 5.4 bar spec

Now my gauge isn't that precise and it's a long way from the drivers seat to where it is located, so for me at stalling speed the value is correct. I did notice as I engaged a gear the pressure dropped down to almost zero before returning to 5 bar.

Something seems to be forcing the SLT pressure to be high at idle
« Last Edit: 04 December 2018, 06:35:31 PM by carrera »
9-5 Aero Estates, 2002 Cosmic Blue, 2002 Steel Grey, 2003 Graphite Green, 2003 9-5 Glacier Blue 2.0 saloon

carrera

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Re: Noisy chain / knocking
« Reply #33 on: 08 December 2018, 01:32:42 PM »
Problem solved  ;D ;D ;D

I picked up another transmission control unit and fitted it today.

Cleared the stored codes, switched off, on again and immediately felt the difference. I don;t have the ability to clear the stored adaptation values so just did a bit of the workshop test and a short test run. All seems fine.

This has been a bit of a diversion from my noisy chain / knocking thread. The engine was going to be a donor, but now this car is rescued and will be going back on the road. A bit of minor work to do and then she'll be ready for a new owner.

As there's a fair bit of auto transmission diagnosis / information here, and it could probably deserve being in its own thread, is it possible to pull them out into another thread where the info may be easier to find ?

Thanks for all the help and advice along the way


 
9-5 Aero Estates, 2002 Cosmic Blue, 2002 Steel Grey, 2003 Graphite Green, 2003 9-5 Glacier Blue 2.0 saloon

carrera

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Re: Noisy chain / knocking
« Reply #34 on: 08 December 2018, 01:34:03 PM »
Now, I'm back on removing the engine from the glacier blue car. Everything is off, it's on the hoist, I just need to get the angles right and hopefully she will be out later today.

I have located another engine to inspect (from another auto) and hopefully drop in
9-5 Aero Estates, 2002 Cosmic Blue, 2002 Steel Grey, 2003 Graphite Green, 2003 9-5 Glacier Blue 2.0 saloon

Audax

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Re: Noisy chain / knocking
« Reply #35 on: 11 December 2018, 09:56:48 AM »
I picked up another transmission control unit and fitted it today.

Cleared the stored codes, switched off, on again and immediately felt the difference. I don;t have the ability to clear the stored adaptation values so just did a bit of the workshop test and a short test run. All seems fine.

Good progress, one thing I have heard but do not have experience of is that if the solenoids get sticky then the resistance increases and causes some component in the TCM to fail, so if it starts doing it again soon it would point to a possible solenoid problem.

carrera

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Re: Noisy chain / knocking
« Reply #36 on: 11 December 2018, 11:20:30 PM »
The engine is finally out of the glacier blue car. Note for others, no you don't need to remove the electrical connectors from the fan housing, but if you do there's just 2 bolts and the whole fan housing can be removed giving necessary additional room to get the engine out.

I have been reading around about setting / adjusting the solenoid valves. When the box and engine are out of the breaker car I am going to have a little look inside the valve housing cover to see what's involved in refurbing / swapping them over
9-5 Aero Estates, 2002 Cosmic Blue, 2002 Steel Grey, 2003 Graphite Green, 2003 9-5 Glacier Blue 2.0 saloon