Rover 75 rough idle and juddring when driving - Page 2

trikey · 23rd August 2018, 09:10

Quote:

Originally Posted by iggle

Just a line to say I went over and seen BIG RUSS he was very helpful, plugged in his T4, fitted a ecu to try that did all sorts of stuff, but like me he is stumped LOL. suggested change eng wiring harness as it may have a bad connection or a break in it, so thats something for me to try. But a big thanks to Russ for all his hard work.

Dave

I was speaking to Russ yesterday (before my rubbish phone signal died) regarding this, changing the engine harness isn’t a bad job to do, just be careful when removing the connectors as some will have been exposed to the heat of the engine and may be brittle.

Hopefully that will sort the issue, I did think a sticky injector until Russ told me you had changed them!

Mike Noc · 23rd August 2018, 09:41

Quote:

Originally Posted by Sheraton

I'm no Diesel expert

Is there a reason why you would discount a Glowplug fault

surely this would cause the symptoms you describe ?

Paul.

These are compression ignition engines , and being common rail the injection pressures are very high, so unless it is extremely cold - well into the minus figures, they will happily start without glowplugs. Once started they have no effect other than emission control when everything is cold, so can't cause any misfiring.

It won't be a cam sensor fault either, as the ECM only references the cam position at start up, and then ignores it until the next time the engine is started.

ZedTeeT · 23rd August 2018, 19:39

As you appeared to have no joy on the electrical and fuelling side, could it be something mechanical, as in the drive train somewhere making it feel like a judder? What's it like at idle?

Mike Noc · 23rd August 2018, 21:38

I would have suggested a fault crank sensor, or maybe a faulty HP fuel pressure regulator, but as Big Russ has had it on his T4 either one should have flagged up.

Sheraton · 24th August 2018, 14:25

Could these symptoms be the result of a DMF issue ?

Paul.

BillyMG · 24th August 2018, 20:13

Have you checked your air filter??

I would hook up to torque, take some live data and compare with standard readings to try to identify what is happening when you get the judder.

23rd August 2018, 19:39	#13
ZedTeeT Gets stuck in MG ZT-T Join Date: Feb 2016 Location: Horsham Posts: 874 Thanks: 197 Thanked 239 Times in 207 Posts	As you appeared to have no joy on the electrical and fuelling side, could it be something mechanical, as in the drive train somewhere making it feel like a judder? What's it like at idle? __________________ My garage. 03/53 MG ZT-T+ CDTi auto in XPG. 232k and much to do! 21/21 MG ZS ev. Daily. 85/C Capri 2.8i Special. Mine 29+ years. 82/X Talbot Tagora SX V6. Restoration project. 11/11 Hyundai I Load CRDi. Van....... nuff said.

23rd August 2018, 21:38	#14
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,554 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	I would have suggested a fault crank sensor, or maybe a faulty HP fuel pressure regulator, but as Big Russ has had it on his T4 either one should have flagged up.

24th August 2018, 14:25	#15
Sheraton Posted a thing or two Rover 75 1.8t Join Date: Oct 2015 Location: Edinburgh Posts: 1,377 Thanks: 384 Thanked 409 Times in 267 Posts	Could these symptoms be the result of a DMF issue ? Paul.

24th August 2018, 20:13	#16
BillyMG Gets stuck in MG ZT 2.5 V6 Auto Tourer (Elizabeth) / MG ZT CDTI (Farage) Join Date: Jan 2017 Location: St Helens Posts: 688 Thanks: 339 Thanked 109 Times in 89 Posts	Have you checked your air filter?? I would hook up to torque, take some live data and compare with standard readings to try to identify what is happening when you get the judder.