Shame I didn't start this thread when I started tackling the issues, that being right as the timing belt snapped, I'll try and make a concise story from begging to end.
One day over the Humber bridge, my car just stalled/stopped on the bridge leaving me started, had to get recovered. Found out that the issue was a snapped timing belt, went to my local Volvo mechanic to get it replaced and sorted.
After replacing the Timing belt, checking the timing, possible damages and all that checking out as well as replacing some other worn parts, I got the car back and was running fine.
There was a slight lack of power going 0-60
but we concluded that it must had been the "Soot full" message at fault that appeared several months after the timing belt replacement. Hasn't been the first time as we've had it in the past and other dealerships
(even went to a top notch auto service one time I was cought with the DPF message while being abroad on holiday) and have done their "regeneration" process that sorted the issue out previously.
Fairly quickly after the recent DPF full message appeared, the car went into a limp mode with a lack of power, one that even somebody who doesn't drive cars would notice.
That's when I started created this thread.
Then the first covid lockdown happened and the place we wanted to get our DPF filter sorted at cancelled everything on the day it was meant to happen. Having no luck cleaning it ourselves, we bought a replacement as well as all the new sensors and everything. After installing everything, I can't exactly remember why we couldn't go back to our mechanic but had to go to the Volvo dealership for them to reset the software + do a diagnostics just in case anything was missed. Kinda weird that a car needs software after a DPF replacement.
Drove to the dealership just fine and when I got the keys and walked back to my car, it was barely functional, sounding like a cyclider wans't working. Close to no power, can't participate in traffic. Looking back now I know I should have just barged back in the dealership and told them to sort this out, give back a car that I delivered to them, however for some reason in the heat of the moment we just towed the car back home. They claimed that's how they got the cars, but since I didn't wait to see them sit in the car, turn it on and drive it into the service themselves, I'll never know. Now I'll know better to never take my eyes off my car, even at a dealership.
Later, with the Volvo mechanic we slowly replaced part after part and going to other mechanic to check up on things my mechanic didn't have tools for
(such as for compression and injector testing) everything was good
(One garage/service was attrocious however. The attitude and care isn't acceptable. They forgot to put the car back together when I came to pick it up and didn't clean their black oiled hands when getting into a white leather car. Still have stains in several places). If I remember correctly, the last garage that got our car all dirty we didn't trust, thus their results that each injector runs fine + swapping them around changed nothing. We planned to test the injectors out ourselves. In the process of towing the car around the "Soot filter full" message reappeared again, some 6 miles after a complete DPF filter replacement, sensor replacement and computer DPF reset. We also went back to the dealership one last time who spent some £400+ for them to not find anything.
Testing out each injector ourselves, we found nothing as all the reading and spray patterns matched up to what they should be. Sure it might not have been the most scientifically accurate test compared to a professional machine but it did the job of showing us that the injectors worked. Noid lights also worked and showed that the injectors were receiving the signals they should have.
Going to place back the injectors and tightening them by hand first, we noticed that screw 2 of injector 4 was looping. Somebody had stipped a thread for one of the screws. Sadly I can't go on a witch hunt to find who's at fault since so many people have handled injectors, in and out, in and out... To make a new thread the swirl flap cover has to come off. After all is said and done, everthing back in place we tried to start the car but nothing. The engine turns over but nothing follows. Tried to prime(? not sure about the terminology), basically bleed the air out of the high pressure fuel pump but no luck. I hope we're just doing it wrong but still strange. It's should be an easy process and the first fuel system my dad can't even get to bleed properly and he has some 40+ years of working on engines, cars, motorbikes, mostly trucks and tracktors however. The fuel comes out clean from the low pressure pump just this high pressure pump that is proving difficult right now. We do the bleed correctly, and when turning the engine over, sounds like the first cyclider work and nothing after that. We can also see that there are bubbles from cylinder 4 when turning over so doubt the new thread is working as well as we hoped. Did I even mention that some of the screws holding the injectors in place had been replaced by some service with some cut short wrong ones not the original spec that should be there? Shameful...
That's pretty much all and where I am at. Hope this helped get the whole picture from start to now and that I didn't miss anything as the months and events are kinda blurring into each other.
Quote:
Originally Posted by Tony Rama
I read the whole thread. It is a sad situation.
From what I understand No4 is not firing. This is evidenced also by the extra smoke.
Since the cam belt snapped and it was running OK before that, then that's where I would start.
Double check all the cam timing.
If that is all correct then the next thing would be to take the rocker cover off and physically check that No4 valves are opening and closing as they should.
I have never heard of a cam belt snap and there not be any damage to an engine (unless a non interference design like the Mazda Mx5).
|
The evidence that Cyclinder 4 is at fault is the VIDA reading that there was a misfire at cylinder 4, the engine didn't change when cyclinder 4 was disconnected as well as the stripped thread allowing bubbles to come from cylinder 4.
The reason why no one has really checked the valves is because the engine worked and worked well after the timing belt replacement. They were even checked during the timing belt replacement and the 2nd time round the dealership visit. Only did the cylinder issues appear after receiving the car back from the Volvo dealership. Since they said that's how they received the car, the only logical thing left is that cylinder 4 went and broke itself, maybe even a valve while the engine was turned off, sitting alone in a Volvo secure car park...