On return from our holiday, there was a helluva exhaust vibration that started at around 62mph. Thing is, the exhaust checked out and as far as I can see, none of the heat shields were loose, even the steering rack one looked good. But we did have a ton of smoke on hard acceleration. I knew the car was using oil and blowing it out of the air doser, so I replaced the crank case breather (again) and while it helped a little, I knew I had to look. The turbo is original and with 104k on the clock, I figured I should check. Now while it was working, the car was not as quick off the mark as it used to be.... I found the spindlle had side to side movement as well as up & down, so I chopped it in for a Garret recon.
While I had everything apart, I needed to undo the DPF to get at the banjo bolt & return hose as the (extra) new kit came with all new pipes, hoses, banjo's & copper washers. I split the DPF and found it to be choked so I blew out the soot & cleaned the thing with brick cleaner 25% & water 75% as I had done with the Berlingo. Left it to dry 24hrs after having blown through with the airline and vacuum cleaner on blow finding air coming rough the whole thing this time & not just the off centre part about 90mm dia. I also blew through the pipes (I couldn't undo the bottom pipe as it was solid and I figured I might damage the threads, so I undid the clip at the hose leading to the pressure sensor) having unclipped the rubber hoses from the stainless pipes, leaving the sensor alone (it lives on the bracket below the air doser).
Upon replacing the DPF back on the engine, I once again blew through the pipes to make sure the were clear before replacing the hoses to the sensor.
However, upon restart, the engine sounded perfect, but grey smoke appeared after a while of idle, but cleared upon gentle throttle presses. I noted the MIL was also lit, which made me wonder if I had missed a plug? (I hadn't). I interrogated the ECU and went into the particulate filter setting and was surprised to see 0% pressure! I went to the graph and sure enough, not a peep, even with throttle. So I took it a run round the block, still no reading, but no harsh smoke on any throttle setting, only at idle.
I have ordered a replacement sensor, but I wonder if I am missing something
I also noted some other curious "glitches" with the car such as an erratic fault with the cruise control, which upon interrogation it states "wire fault under the steering" which I assumed to be a brake switch, so I replaced it with a new identical green & black 4 pin, but no change. It would work, cruise for dozens of miles, then push the horn switch, horn would sound but cruise would disconnect with "service" light showing for a moment.
The battery is showing ok, but it is old so I wonder if that is creating "ghosts" in the CAN bus network! I have seen this with flat batteries after a jump start, but once the engine is running & faults cleared, they don't come back. But these appear to be permanent with the C4. That, an oil pressure sensor and something else that escapes me at present.
Anyone know if these DPF sensors just suddenly "go" or am I missing something else? As a side note, the catalytic converter temperature sensor is working as I could see it reading while the car warmed up, then it went up after I hoofed it around the village.
Is there a test I could carry out on the sensor? Or could it be something more expensive?
Cheers.
) so I suspect you are right. It's the model with the static airbag so I imagine it'll be fun to fix. However, since my wife uses those disgusting vapes, I wonder if the tracks just need cleaned like the windscreen does every five minutes?? 