|
||
|
17th October 2023, 13:23 | #1 |
Avid contributor
Rover 75 Saloon Connoisseur SE 2.5V6 Join Date: Oct 2011
Location: Aberdeen
Posts: 226
Thanks: 56
Thanked 12 Times in 11 Posts
|
Lumpy engine/misfiring
Anyone in Perth/Dundee area with a T4 diagnostic available tomorrow?
On a visit to daughter and family near Auchterarder today but lumpy engine as if not firing on all cylinders on way down from Aberdeen this morning. Suspect maybe a coil pack or spark plug „gone“ (or Vis motor issue?) but obvs. not sure. Thankfully no engine light warning. Have pm‘d Astraeus but not sure if he is around. Tks |
24th October 2023, 19:10 | #2 |
Avid contributor
Rover 75 Saloon Connoisseur SE 2.5V6 Join Date: Oct 2011
Location: Aberdeen
Posts: 226
Thanks: 56
Thanked 12 Times in 11 Posts
|
Postscript to my earlier message:
OK so there were no T4 patrolman standing by on the road back home last Wednesday... Before I do have the chance to have it T4 checked, I thought I would describe symptoms a bit more fully in case its a bit more obvious to those of experience or with advice to offer. Limped home as journey down had been with possibly slight misfiring? and slight vibration and then with slight misfiring and very noticeable vibration, above say 55mph. Improved when coasting or clutch engaged. Problem has not gone away. No engine warning lights(s) showing at any time. Took car to Halfrauds early on Saturday morning as I know one of the guys slightly, so yes they plugged in their diagnostic tool ...but said there were no faults showing. Mmmm not sure how confident I am of that... Do you think it is engine; spark plug(s), ignition pck(s) or VIS motor or a tyre, wheel, bearing, half-shaft issue? The car was MOT'd three weeks ago but garage cannot take vehicle in to have a look at it for another 10 days. Any advice gratefully received thanks |
24th October 2023, 19:47 | #3 | |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,395
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
|
Quote:
Misfiring, ranging from just detectable to so severe that the engine was reluctant to run from a cold start, was the symptom when I had ignition coil faults. I've never had sparking plug trouble in nineteen years of ownership. VIS actuator troubles don't cause misfiring. It won't be a drivetrain issue. If I were you Ian, I would invest in a T4 diagnosis. When I had ignition coil faults, the "check engine" light remained off but T4 was able to identify which cylinder was responsible which was incredibly useful! Simon
__________________
"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
|
26th October 2023, 12:57 | #4 |
Loves to post
Rover 75 Saloon Join Date: Apr 2022
Location: Bolton
Posts: 309
Thanks: 180
Thanked 42 Times in 34 Posts
|
Toaf?
Is there anyone near you with TOAF, I use it on my 1.8 which runs fine, and has no warning lights - but TOAF reports minor problems... as per attached text file.
__________________
I am Kevin, the car is my Viking shield-maiden, Lagetha! 2000 Rover 75 1.8 Classic SE in Moonstone Green/Black Leather seats and Sandstone Beige Interior (purchased 10 April 2022) 2002 Rover 25 2.0 IL TurboDiesel - gone but not forgotten, you can follow Deric's adventures on YouTube at Boaty's World and Project Nigel. AllegroMan is restoring Deric now. (Owned 25/10/2022-15/05/2023) |
27th October 2023, 16:45 | #5 |
Avid contributor
Rover 75 Saloon Connoisseur SE 2.5V6 Join Date: Oct 2011
Location: Aberdeen
Posts: 226
Thanks: 56
Thanked 12 Times in 11 Posts
|
Update:
Won't get a chance for T4 until week after next ...but meanwhile have got hold of a Foxwell NT204 OBDII Reader (from the very helpful. informative guys at Gendan). I've got a fault code P1035. Lots of suggestions when I resort to Google but failure in ignition coil No.? is there. Might that be it? |
27th October 2023, 17:16 | #6 | |
This is my second home
rover 75 1.8 vvc club se wedgwood blue Join Date: Aug 2009
Location: Seaton Carew
Posts: 26,923
Thanks: 65
Thanked 7,142 Times in 4,642 Posts
|
Quote:
|
|
27th October 2023, 17:47 | #7 |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,395
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
|
That code doesn't exist for the Siemens 2000 Ian (source: RAVE). This is the problem with using third party code readers.
Get it on the T4 in a couple of weeks and let us know what it says please. Cheers, Simon
__________________
"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
5th November 2023, 16:30 | #8 |
Avid contributor
Rover 75 Saloon Connoisseur SE 2.5V6 Join Date: Oct 2011
Location: Aberdeen
Posts: 226
Thanks: 56
Thanked 12 Times in 11 Posts
|
UPDATE:
Had T4 tested yesterday. Code P0303. Cylinder 3 misfire. Removed coil and plug: plug in good condition and correct gap; put in new replacement coil. Took car for 5 minute run, (country roads only), to put engine under load, seemed fine. Re-tested on T4, no re-occurrence of fault code P0303. Sorted(?). Took car late yesterday afternoon on A90 dual carriageway. Repeat, as before, of significant vibration above around 55-60 mph as described and discussed earlier on this threads. I'm now thinking on the second part of my 2nd entry on this thread: Do you think it is engine; spark plug(s), ignition pack(s) or VIS motor or a tyre, wheel, bearing, half-shaft issue? even though it was answered: "It won't be a drivetrain issue". Might it well be a drivetrain issue.? First stop now I think is to have a wheel alignment check. |
5th November 2023, 22:06 | #9 |
This is my second home
Roverless + 1.7D Sportage Join Date: Aug 2014
Location: East Norfolk
Posts: 7,050
Thanks: 729
Thanked 2,021 Times in 1,449 Posts
|
If your model has coil leads (prior to 2002), they are known to break down (carbon break up) and also the connection (lead to plug) can deteriorate/break up. A new set of leads cured the same problem on mine.
Matt will have them? Cylinder 3 is middle one behind the grill (ie not at the back of the engine)
__________________
Oil in my veins! Last edited by roverbarmy; 5th November 2023 at 22:13.. |
6th November 2023, 07:02 | #10 | |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,395
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
|
Quote:
That answer of mine was in response to your report of engine misfiring which can produce vibration. The priority was therefore to deal with the engine fault which you have now done with a new ignition coil on cylinder no. 3. You're now reporting significant vibration at a particular speed but no engine misfiring so I agree that mechanical faults now need to be investigated. I'd suggest that you begin with wheel balancing if you're experiencing vibration through the steering wheel. A four wheel alignment check is always a good idea if it's never been done (common symptoms are uneven tyre wear and poor handling but in my experience, not vibration). Simon
__________________
"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
|
|
|