As you say UK laws are different unfortunately, not so much protection for the consumer instead favouring the business.UK laws are different, but within 6 months, maybe. I think they updated protection on used cars like some states here do.
I completely agree, this can't be the only Volvo with this problem ever. I would be surprised if there isn't already some sort of Volvo knowledge base linking specific symptoms to faults, I wouldn't be surprised however if the dealerships aren't aware of it or simply choose not to make use of it.What buggles my mind about these giant car companies. How do they not have a knowledge base of videos and advices from different problems of their cars from around the world.... With video and probably solution or flow charts especially if it goes to techs at headquarters. I'm pretty sure that is not the first time this problem arises. And the incompetent techs at the dealers are unreal....
My brother in law just took his ram truck to dealer for 4wd service light under warranty.. Charged him $900 . Two days later the light came back.. went there they wanted to charge him some more....
The vip warranty for example should require video evidence and steps took to diagnose..
The dealership have told me they have not seen any fault codes. As for the history, I have requested this from Volvo but they are only able to share service history, and from this I can see it has been serviced by Volvo at regular intervals since new. I asked the dealership to show me any other history on their database and this only included software updates etc. no record of previous repair work.Can you list all of the codes that you have seen and that the Volvo dealership has recorded? Since you purchased the car used 6 months ago any ideal about past repair history? I am not sure about your market, here in the US, Volvo is very helpful about diagnosing problems like this. Any idea if the dealership has inspected the spark plus for being worn out, loose or have installed a new set? The injectors could be an issue or high pressure fuel pump?. If the engine has had internal repairs, it is possible that the balance shaft backlash was not adjusted properly. Below is a pic of the balance shaft assembly. The balance shaft assembly will cause engine shake, not sure about the misfire codes.
You may have more that 1 problem. Hopefully the dealer and Volvo will get this corrected.
The task of the balancer shafts is to smooth out the engine's oscillations and they are driven by a gear on the crankshaft. The two counter-rotating balancer shafts are located in their own housing in the oil sump. Drive to the balancer shafts is via the crankshaft to one balance shaft, which in turn drives the second balance shaft. One of the balancer shafts' gears is two-piece. The "narrow" half (Scissor gear) is spring tensioned in the opposite direction to the "wide" half. It provides silent backlash elimination. This technology is already found in the gear on engine B63x4x. To ensure correct backlash, the balance shaft housing is shimmed to the engine block at the assembly plant.
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Wow....The dealership have told me they have not seen any fault codes. As for the history, I have requested this from Volvo but they are only able to share service history, and from this I can see it has been serviced by Volvo at regular intervals since new. I asked the dealership to show me any other history on their database and this only included software updates etc. no record of previous repair work.
In the last 6 months, in attempt to resolve the problem, the dealership has done the following that I am aware of:
That's an interesting point regarding the balance shaft, I will have a read into this.
- Changed Crankshaft Pulley, Auxiliary Belt & Tensioner - This made no difference.
- Changed Spark Plugs - This made no difference.
- Changed 1x Coil Pack - This made no difference.
- Performed Compression Test - All OK (At the time they mentioned if anything it was very slightly higher than expected)
- Checked Cambelt Tensioner & Timing - Tensioner slightly under tensioned, otherwise all OK, no difference after adjustment.
- Observed a small amount of milky fluid on oil filler cap (suspected due to short journeys in the winter months, disappears after a slightly longer journeys)
- Removed interior carpet to check for water ingress - No sign of water.
- Removed ECU and various other components to check for water ingress - No sign of water.
- Observed random misfires on all four cylinders.
I think there is more to it than just a misfire, certainly.Are you certain then that its a misfire? Have heard of cam journals getting worn out at low mileage
The Volvo techs said they have done a compression test and was all ok.Wow....
Misfire is either a mechanical issue or ignition fuel delivery issue ...
Did they do compression test?
It could be that the timing is off? Are the valves bent?
How could they not find the issue after 6 months is beyond me. I'm not a mechanic but I think logically. Mechanics 101...
If they just change parts and cross their figures they are incompetant.
Find a mechanic that knows what they are doing like scoty kilmer or the carcarenut
This has crossed my mind, I don't really understand how this all works with the hybrid system though.How's the battery? How old is it? (there should be a date code on it).
Checked the battery voltage today, after being parked for a while it was at 12.7V so that looks ok to me.How's the battery? How old is it? (there should be a date code on it).
The Freeze Frame data would be really useful. I have used this before to help diagnose problems on my previous Audi's and it always worked well.Look for odd behavior in manifold pressure, fuel pressure, timing, coolant temperature, pedal position, etc.
It's been a long time since I've done this and I'm not a pro, but in the US at least, a Freeze Frame is recorded at the moment a fault occurs. That would be valuable. I don't know if happens when a fault occurrence happens, or when a fault code is set. Two different things.
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I haven't considered ISG before, however I did suspect the supercharger for a while as the noise seems to disappear at higher RPM and i know the supercharger disconnects at 3.5K RPM.I'll chuck a W.A.G. out there. Loose mounting of crankshaft to transmission components/ISG type area. Something loose in ISG itself maybe. Or something like the supercharger way loose/out of balance.
Only because all the obvious stuff seems done already. No matter what, it really seems mechanical, but then it can go away...
How do I do that? I have several different dongles....It would be really great if someone else with a T8 and an ELM327 OBDII dongle could run a similar capture for comparison though.