S80: Engine Problems won't go away. What else could there be?

[Simmy]

check that genuine dpf sensor was used as cheap ebay ones wont do the job ask me how
i know buy cheap buy twice

[venomtail]

Now that you mention part testing, I have realised that the only parts that haven't been "tested" to see if they're getting the right numbers are the senors in the new DPF filter. Everything else was sested such as MAF sensor, injectors, EGR valves and so on.

Will mention to check them yes. Thanks.

[venomtail]

check that genuine dpf sensor was used as cheap ebay ones wont do the job ask me how

DPF sensors were bought new and I even only go for big reputable brands just in case even if I pay extra such as Bosch. One was like what, £90?

[seanc]

Thinking back to your cylinder 4 issue (sorry if this has been asked and answered and I forgot), you mentioned swapping injectors between a working cylinder makes no difference. Has anyone actually verified you have power and signal to cylinder 4 injector??

[venomtail]

Thinking back to your cylinder 4 issue (sorry if this has been asked and answered and I forgot), you mentioned swapping injectors between a working cylinder makes no difference. Has anyone actually verified you have power and signal to cylinder 4 injector??

As far as I know the wiring itself was fine, since when the place that tested the injectors, first tested wiring and electricals before moving onto testing the injectors separatley and swapping them around.

[Laird Scooby]

Originally Posted by venomtail

As far as I know the wiring itself was fine, since when the place that tested the injectors, first tested wiring and electricals before moving onto testing the injectors separatley and swapping them around.

Have they put NOID lights on the injector plugs?

[venomtail]

Have they put NOID lights on the injector plugs?

I assume they have tested them one way or another, I'm not really there while they test them but I can ask for the mechanics to touble check.

[Laird Scooby]

Originally Posted by venomtail

I assume they have tested them one way or another, I'm not really there while they test them but I can ask for the mechanics to touble check.

Might be wise, it could show something up that hasn't been detected by the ECU and possibly not previously noticed by them despite best efforts.
I suggested the ECU may be faulty some posts further up, it's possible the output stage in the ECU has been lost/is intermittent on the cylinder that's not firing, inspecting the wiring wouldn't show this up but a NOID light will.

[GrahamBrown1]

I’ve had a quick browse of this thread, looks like a lot of heart ache. Surely a Volvo specialist with Vida dice would have been your best option early on. Then I read the timing belt snapped. As was mentioned you are lucky to escape damage. You say compression is all good but you are still left with a poor running car.

What I have seen before on one of these is when a timing belt has snapped the cam lobes rotate on the shaft as they are only a press fit. Timing is obviously out even tho all marks from the outside line up. Just a thought..............


Also the injectors, are they correctly coded to the car with right one in each cylinder. You mentioned they have being swapped about and all sorts. It sounds a bit of a mess with every Tom dick and a Harry being having a poke and no further forward.

[venomtail]

Had a cleaning specialist check for any blockades that might be hidden somewhere causing issues from their past experience, but everything checks out. Everything from the exhaust manifold is clean and no blockades.

Guess from we we're gonna take a few steps back. I want to fully re-check everything related to the injectors, such as connections and cables. Then see from there.

Funniest part is I bought a temporary replacement car to get me places while this one doesn't run, and a year has passed and my replacement car soon will need to pass its MOT and I have doubts. Fun 2 months ahead for me now.