Rough running

Mike Trident · 2nd August 2022, 20:52

My diesel has been running rough over the last few days.

I got my wife to sit in it and watch the rev counter while I had a look around under the bonnet.

I may have found the problem, there is a cable running in front of the battery box and ends in a plug that goes into the fuel filter housing. When I move this cable about I can get it in a position where the engine starts to run sweet again. What exactly is this sensor?, what does it do? And were do the wires dissappear to?

The problem seems to be more the wiring than the actual plug.

Thanks

BigRuss · 2nd August 2022, 21:47

Hi Mike it's the wiring to the low pressure fuel sensor in the filter head.
Normally if it's not making a proper connection the check engine light will come on, my tourer used to do it quite often but never caused any running problems. I used to lift the bonnet undo it and plug it back in a couple of times the light would go out.
The wires go back to the engine ECU

Russ

Arctic · 2nd August 2022, 22:55

Quote:

Originally Posted by BigRuss

Hi Mike it's the wiring to the low pressure fuel sensor in the filter head.
Normally if it's not making a proper connection the check engine light will come on, my tourer used to do it quite often but never caused any running problems. I used to lift the bonnet undo it and plug it back in a couple of times the light would go out.
The wires go back to the engine ECU

Russ

Give it a few squirts of contact cleaner.

1

2

Maybe trace the wiring backwards from the sensor unit.

Mike Trident · 3rd August 2022, 05:52

Thanks for your replies.

It seems to run well when I lift the wires at the battery case area. Touching the wires around the plug area doesn't seem to do much.

Worth further investigation me thinks.

Russ, I've got my parcel to collect this morning, I'll try get the indicator stalk fitted this evening. I'll give you a call .

2nd August 2022, 20:52	#1
Mike Trident Posted a thing or two Rover 75 CDTi Saloon & Citroen C1 Join Date: Jun 2016 Location: Oakenshaw, Near Bradford Posts: 1,622 Thanks: 385 Thanked 552 Times in 328 Posts	Rough running My diesel has been running rough over the last few days. I got my wife to sit in it and watch the rev counter while I had a look around under the bonnet. I may have found the problem, there is a cable running in front of the battery box and ends in a plug that goes into the fuel filter housing. When I move this cable about I can get it in a position where the engine starts to run sweet again. What exactly is this sensor?, what does it do? And were do the wires dissappear to? The problem seems to be more the wiring than the actual plug. Thanks __________________ Rover 75 2.0 CDTi (131Ps) Conn SE Saloon. (Manual) 160 Remap, cruise control, electric window blind, temp gauge, Real walnut / ZT interior, FBH with GSM control. BORN Tuesday, 5th October 2004 @ 12:35:52 This vehicle was the 104,679th 75 to run off the production line, out of 112,381 This vehicle was the 3,318th 75 CDT Connoisseur SE (135) to be made out of 4,744 This vehicle was the 12,440th 75 in Starlight Silver (code: MBB) to be made out of 14,280 Starlight Silver 75s

2nd August 2022, 21:47	#2
BigRuss Premium Trader 75 CDT Tourer,2.5 Launch Saloon, Omipro MG/Rover (T4) Join Date: Jul 2007 Location: Liversedge, West Yorkshire Posts: 5,405 Thanks: 1,105 Thanked 1,340 Times in 661 Posts	Hi Mike it's the wiring to the low pressure fuel sensor in the filter head. Normally if it's not making a proper connection the check engine light will come on, my tourer used to do it quite often but never caused any running problems. I used to lift the bonnet undo it and plug it back in a couple of times the light would go out. The wires go back to the engine ECU Russ __________________ Replacement Key Service http://https://the75andztclub.co.uk/...d.php?t=244732 Full T4 Testbook diagnostics available. Diesel ECU repair and replacement. Options enabled or disabled as required. Diesel X-Power 135 and 160bhp, Rover 1.8T 150 to 160 MG 160 V6 to 177 upgrades available P.M. for details.

3rd August 2022, 05:52	#4
Mike Trident Posted a thing or two Rover 75 CDTi Saloon & Citroen C1 Join Date: Jun 2016 Location: Oakenshaw, Near Bradford Posts: 1,622 Thanks: 385 Thanked 552 Times in 328 Posts	Thanks for your replies. It seems to run well when I lift the wires at the battery case area. Touching the wires around the plug area doesn't seem to do much. Worth further investigation me thinks. Russ, I've got my parcel to collect this morning, I'll try get the indicator stalk fitted this evening. I'll give you a call . __________________ Rover 75 2.0 CDTi (131Ps) Conn SE Saloon. (Manual) 160 Remap, cruise control, electric window blind, temp gauge, Real walnut / ZT interior, FBH with GSM control. BORN Tuesday, 5th October 2004 @ 12:35:52 This vehicle was the 104,679th 75 to run off the production line, out of 112,381 This vehicle was the 3,318th 75 CDT Connoisseur SE (135) to be made out of 4,744 This vehicle was the 12,440th 75 in Starlight Silver (code: MBB) to be made out of 14,280 Starlight Silver 75s