Oxygen sensor fault codes again - 1.8 - Page 2

EVS · 28th October 2023, 09:30

Upon closer inspection, might not be melted but may have been done at the shop. Either way, it didn't use to look like this a few years ago.
Now, if I cut these wires, does it matter which wire goes back where or are they interchangeable?

SD1too · 28th October 2023, 11:53

It's good practice Erik to reconnect the wires exactly as they were removed. According to the wiring diagram you should have yellow/blue and black/orange.

It's always difficult to be sure from photographs but is the "melted plastic" actually black mastic?

Simon

EVS · 28th October 2023, 15:55

The car seems to respond a lot better after I cut the wires. A few hiccups, but nowhere near as serious, it seems. However, the shuddering/jerking wasn't always there so might not be a representative test yet... Can I leave the wires cut for a day or so longer to see if that was indeed the problem? Is there a way to test if it's the canister itself giving problems or is the drive the only way to test it?

Quote:

Originally Posted by SD1too

It's good practice Erik to reconnect the wires exactly as they were removed. According to the wiring diagram you should have yellow/blue and black/orange.

It's always difficult to be sure from photographs but is the "melted plastic" actually black mastic?

Looks like the wires were replaced at some point then, and yes, it might be black mastic rather than a melted connection. That must've been done at the shop at some point then, as I definitely had an actual clip on there originally. I've replaced the canister a few years ago and it definitely had a clip then.

SD1too · 28th October 2023, 16:28

I've just checked my engine and can confirm that your electrical connector is missing, the wiring has been modified and the ends appear to have been put directly into the purge control valve (the canister is near to the fuel tank) and covered in black mastic.

I'd take your car elsewhere for repairs in future if I were you Erik.

Can you scoop out the black goo and find out how, or if, the wires are connected to the terminals of the valve?

Simon

EVS · 28th October 2023, 16:56

I'm not sure who did this repair (used to go elsewhere but they proved unable and unreliable as far as Rovers are concerned), but at the moment I'm with a Jaguar/Land Rover shop (listed on Xpart) who employ a dedicated Rover specialist, so they should be good, albeit costly. They've always helped me well in the past but their prices are steep. Unfortunately, there aren't really any alternatives around here that are reliable so I'm stuck with the expensive option.
Given the other qualitative repairs the JLR shop has done, I'm inclined to suspect the previous one of this 'repair'.

I've just tried to remove the mastic but it's as hard as regular plastic so definitely no scoopable goo. I can try to drill it out but I'm afraid getting a view of how the wires are connected will be rather tricky, if not impossible.

Just had to go pick up my daughter, so drove with the valve still disconnected and the shuddering doesn't seem resolved after all. Upon arriving back home, the engine very clearly wasn't running smoothly when stationary either. It ended up somewhat stabilising but the whole thing was definitely not as it should be.

EVS · 10th November 2023, 19:41

Since last time, I've soldered the valve back in place and for a while, all seemed well. Of course, things didn't stay that way and now my car's having issues again. Pulling away can still mean the revs drop - sometimes stalling the engine - and at times the car feels like the engine's not getting enough power. It'll drive without jerking but the car feels as if it's limited. Shutting the engine off and restarting can remedy the issue, but obviously that's not a structural fix.
No fault codes have returned as of yet, but the fuel consumption is rising again and I suspect some fault codes will be popping up soon.
As the issue didn't seem resolved without the purge valve, I suppose the issue lies elsewhere. Does anyone have any idea what it could be?

SD1too · 11th November 2023, 07:33

Quote:

Originally Posted by EVS

... at the moment I'm with a Jaguar/Land Rover shop (listed on Xpart) who employ a dedicated Rover specialist, so they should be good, albeit costly. They've always helped me well in the past but their prices are steep.

Is your plan to repair this yourself due to the high cost of the JLR garage? If so, I would begin with standard engine service checks (e.g. sparking plugs, vacuum hoses, throttle cable adjustment etc.).

Simon

EVS · 11th November 2023, 18:28

If feasible, I'd like to repair it myself, with pointers from this far more experienced group of people.
If it's beyond my capabilities, I suppose I'll have no other choice than to get it to the shop...

EVS · 18th November 2023, 10:45

There's times my car runs perfectly fine, then at times it stalls right after starting the engine. Other times it shudders, or suddenly loses power. But again, this isn't always the case.
Wouldn't an issue with the spark plugs etc manifest itself more consistently?
I'm now wondering if it could be a throttle issue? Is there a way I could test this or would a trip to the shop be needed in that case?

SD1too · 18th November 2023, 12:04

We haven't considered fuel filter syndrome yet. This can be intermittent and the low fuel pressure may well result in the stalling, shuddering and reduced power that you've described. It's worth checking.

Simon

28th October 2023, 11:53	#12
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,403 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	It's good practice Erik to reconnect the wires exactly as they were removed. According to the wiring diagram you should have yellow/blue and black/orange. It's always difficult to be sure from photographs but is the "melted plastic" actually black mastic? Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

28th October 2023, 16:28	#14
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,403 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	I've just checked my engine and can confirm that your electrical connector is missing, the wiring has been modified and the ends appear to have been put directly into the purge control valve (the canister is near to the fuel tank) and covered in black mastic. I'd take your car elsewhere for repairs in future if I were you Erik. Can you scoop out the black goo and find out how, or if, the wires are connected to the terminals of the valve? Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

28th October 2023, 16:56	#15
EVS Regular poster Rover 75 1.8 Connoisseur SE Join Date: Jul 2020 Location: Flanders Posts: 68 Thanks: 13 Thanked 7 Times in 3 Posts	I'm not sure who did this repair (used to go elsewhere but they proved unable and unreliable as far as Rovers are concerned), but at the moment I'm with a Jaguar/Land Rover shop (listed on Xpart) who employ a dedicated Rover specialist, so they should be good, albeit costly. They've always helped me well in the past but their prices are steep. Unfortunately, there aren't really any alternatives around here that are reliable so I'm stuck with the expensive option. Given the other qualitative repairs the JLR shop has done, I'm inclined to suspect the previous one of this 'repair'. I've just tried to remove the mastic but it's as hard as regular plastic so definitely no scoopable goo. I can try to drill it out but I'm afraid getting a view of how the wires are connected will be rather tricky, if not impossible. Just had to go pick up my daughter, so drove with the valve still disconnected and the shuddering doesn't seem resolved after all. Upon arriving back home, the engine very clearly wasn't running smoothly when stationary either. It ended up somewhat stabilising but the whole thing was definitely not as it should be. Last edited by EVS; 28th October 2023 at 19:57.. Reason: After another drive, issue doesn't seem to be resolved

18th November 2023, 12:04	#20
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,403 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	We haven't considered fuel filter syndrome yet. This can be intermittent and the low fuel pressure may well result in the stalling, shuddering and reduced power that you've described. It's worth checking. Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

28th October 2023, 09:30	#11
EVS Regular poster Rover 75 1.8 Connoisseur SE Join Date: Jul 2020 Location: Flanders Posts: 68 Thanks: 13 Thanked 7 Times in 3 Posts	Upon closer inspection, might not be melted but may have been done at the shop. Either way, it didn't use to look like this a few years ago. Now, if I cut these wires, does it matter which wire goes back where or are they interchangeable?

10th November 2023, 19:41	#16
EVS Regular poster Rover 75 1.8 Connoisseur SE Join Date: Jul 2020 Location: Flanders Posts: 68 Thanks: 13 Thanked 7 Times in 3 Posts	Since last time, I've soldered the valve back in place and for a while, all seemed well. Of course, things didn't stay that way and now my car's having issues again. Pulling away can still mean the revs drop - sometimes stalling the engine - and at times the car feels like the engine's not getting enough power. It'll drive without jerking but the car feels as if it's limited. Shutting the engine off and restarting can remedy the issue, but obviously that's not a structural fix. No fault codes have returned as of yet, but the fuel consumption is rising again and I suspect some fault codes will be popping up soon. As the issue didn't seem resolved without the purge valve, I suppose the issue lies elsewhere. Does anyone have any idea what it could be?

11th November 2023, 18:28	#18
EVS Regular poster Rover 75 1.8 Connoisseur SE Join Date: Jul 2020 Location: Flanders Posts: 68 Thanks: 13 Thanked 7 Times in 3 Posts	If feasible, I'd like to repair it myself, with pointers from this far more experienced group of people. If it's beyond my capabilities, I suppose I'll have no other choice than to get it to the shop...

18th November 2023, 10:45	#19
EVS Regular poster Rover 75 1.8 Connoisseur SE Join Date: Jul 2020 Location: Flanders Posts: 68 Thanks: 13 Thanked 7 Times in 3 Posts	There's times my car runs perfectly fine, then at times it stalls right after starting the engine. Other times it shudders, or suddenly loses power. But again, this isn't always the case. Wouldn't an issue with the spark plugs etc manifest itself more consistently? I'm now wondering if it could be a throttle issue? Is there a way I could test this or would a trip to the shop be needed in that case?