|
||
|
23rd March 2017, 10:26 | #11 |
Avid contributor
MG ZT 190 Join Date: Apr 2016
Location: Heathrow
Posts: 166
Thanks: 109
Thanked 24 Times in 14 Posts
|
I have just had exactly the same problem with my 2.5 ZT. A diagnostic plug in (not as good as a T4) showed which pot the misfire was on and so I replaced that plug and coil pack as a starter. Cured immediately So then went on to replace the rest of the plugs as a matter of keeping a matched set. You can measure the gaps with a feeler gauge set bought at any half decent auto shop. (I dont know if the 1.8 has individual coil packs like my KV6 engine!) When you have the T4 plug in, it will tell all.
|
23rd March 2017, 21:15 | #12 |
This is my second home
Rover 75 saloon x2, Rover 75 Tourer x2, Rover 220 Coupe Turbo Join Date: Aug 2010
Location: Kirkcaldy, Fife
Posts: 9,036
Thanks: 2,278
Thanked 2,852 Times in 1,718 Posts
|
Took my car up today to a good friend of mine who had a look at the car on the machine. No obvious signs of misfire showing on any cylinders. He checked the plugs and the plugs were well over 1mm. These were adjusted to 0.6mm.
Result - misfire/hesitation gone. I no longer have a misfire, but can't help the car could be smoother. It feels through the rev range that it's not as smooth as it could be. This was present before. Any thoughts?
__________________
Wanted - Indian bride. Cash waiting. (All sorted - bargain) First name and forum name: Ravinder Rover 75 2.0 CDT Connoisseur SE 116 (160 remap) Royal Blue (JFM) This vehicle was the 50,481st 75 to run off the production line, out of 112,381 This vehicle was the 2,238th 75 CDT Connoisseur SE to be made out of 3,775 This vehicle was the 5,002nd 75 in Royal Blue (code: JFM) to be made out of 14,420 Royal Blue 75s |
24th March 2017, 05:30 | #13 |
This is my second home
75 Tourer 2.5 Auto, 1.8T, 75V8ZT Join Date: Jun 2007
Location: Johannesburg ZA
Posts: 6,200
Thanks: 1
Thanked 859 Times in 613 Posts
|
I would simply replace the plugs, the 1.8 is very sensitive to plugs it seems to me.
I would also make sure the air and petrol filters are clean, and lastly that there is no leak from the inlet manifold. If all this is done, there is not much else there can be done, provided your leads are good and no water is entering from the cooling system. But then it should also be smooth!
__________________
Worth his V8 in gold |
24th March 2017, 06:36 | #14 |
This is my second home
Rover 75 saloon x2, Rover 75 Tourer x2, Rover 220 Coupe Turbo Join Date: Aug 2010
Location: Kirkcaldy, Fife
Posts: 9,036
Thanks: 2,278
Thanked 2,852 Times in 1,718 Posts
|
We did check the plugs and agreed the plugs looked in very good condition. I'll have a look at the other things too. The car seems to drive fine. Maybe I'm just being picky but I just notice these things.....
__________________
Wanted - Indian bride. Cash waiting. (All sorted - bargain) First name and forum name: Ravinder Rover 75 2.0 CDT Connoisseur SE 116 (160 remap) Royal Blue (JFM) This vehicle was the 50,481st 75 to run off the production line, out of 112,381 This vehicle was the 2,238th 75 CDT Connoisseur SE to be made out of 3,775 This vehicle was the 5,002nd 75 in Royal Blue (code: JFM) to be made out of 14,420 Royal Blue 75s |
24th March 2017, 07:17 | #15 |
This is my second home
75 Tourer 2.5 Auto, 1.8T, 75V8ZT Join Date: Jun 2007
Location: Johannesburg ZA
Posts: 6,200
Thanks: 1
Thanked 859 Times in 613 Posts
|
You cannot judge a spark plug by its cover!
If you want, see how it fires under pressure. You could be surprised. What does 4 plugs cost? Change them and eliminate them as a source of problems.
__________________
Worth his V8 in gold |
26th March 2017, 18:33 | #16 |
Loves to post
MG ZT-T 160+ Join Date: Aug 2015
Location: Peasmarsh
Posts: 390
Thanks: 45
Thanked 140 Times in 87 Posts
|
Read your recommendation about plug gaps on 1.8 turbo, took mine out yesterday, cleaned them, and set the gap down to 0.7mm. Went for a run today around Kent to see my son, opened it up a couple of times and all the "flutter" on acceleration has gone! Approx 60 miles and the trip computer reads 37.8mpg, all on mixed "A" roads and country lanes so I'm well happy with that, thanks!
|
27th March 2017, 15:30 | #17 |
Regular poster
2004 Rover 75 1.8T Tourer; 1969 MGB; 1971 Jaguar XJ6 S1 Join Date: Nov 2012
Location: Wellingborough
Posts: 54
Thanks: 3
Thanked 4 Times in 4 Posts
|
My 1.8T is currently running beautifully on new spark plugs straight out of the box (i.e. 1mm gaps) plus new coils.
|
27th March 2017, 21:42 | #18 |
This is my second home
75 Tourer 2.5 Auto, 1.8T, 75V8ZT Join Date: Jun 2007
Location: Johannesburg ZA
Posts: 6,200
Thanks: 1
Thanked 859 Times in 613 Posts
|
The resistance of plugs increase with age. It also increases with pressure!!
Many years ago, Champion (I think) made a small tester. It only needs compressed air and a power supply, and some sand. (My dear friend Hamish Morrison has one, he fixes RR and Bentley and Jaguars!! and has done for many years) You can sandblast the plug on the one setting, and then fire the plug behind a glass. At the same time you can pressurise the chamber and watch the spark. Often, on an older plug, it will fire happily at normal pressure, but fail, as the pressure is piled on. So, my advice is to replace the plugs, it might just work!!
__________________
Worth his V8 in gold |
Thread Tools | |
Display Modes | |
|
|