1.8T misfire almost gone

victorgte · 23rd April 2014, 20:35

Today I changed the 3 vacuum hoses with nice blue silicone ones. Whilst the misfire under hard acceleration has almost disappeared, there is still a bit of hesitation. Car performs better now but it would be good to find the last piece of the jigsaw and get rid of it totally?

suzublu · 23rd April 2014, 20:37

Plug gaps

victorgte · 23rd April 2014, 20:40

Is there an ideal gap? I seem to recall there was something on here last year that suggested a better gap than the book says???????

suzublu · 23rd April 2014, 20:41

0.75mm seems to be the best compromise

doopydug · 23rd April 2014, 20:42

Quote:

Originally Posted by victorgte

Today I changed the 3 vacuum hoses with nice blue silicone ones. Whilst the misfire under hard acceleration has almost disappeared, there is still a bit of hesitation. Car performs better now but it would be good to find the last piece of the jigsaw and get rid of it totally?

Can I ask what ones you used as I want to change all of mine?

MG Tom · 23rd April 2014, 20:45

I say 0.65mm. I tried 0.8mm and it missed terribly.

victorgte · 23rd April 2014, 20:54

Quote:

Originally Posted by doopydug

Can I ask what ones you used as I want to change all of mine?

Went on ebay and searched silicone hoses. One of the first to pop up had a choice of lengths and internal diameters as well as colours.

Chose blue, internal diameter of 4mm and had a 2 metre length. Cost was £5.90 inc. P & P. Bargain I thought. Took just a few minutes to fit all 3. Just take off one at a time and fit by pushing each on one. I reckon I still have more than a metre left!

T-Cut · 23rd April 2014, 21:53

If you increase the bore of the hoses on the turbo, it will not perform as it should. The volume of air being transferred through the pipes is part of the calibration. There's at least one recent thread describing the effect.

TC

victorgte · 23rd April 2014, 22:21

Quote:

Originally Posted by doopydug

Can I ask what ones you used as I want to change all of mine?

Just found the link for it.

http://www.ebay.co.uk/itm/1706993923...84.m1497.l2649

neilbaker86 · 23rd April 2014, 23:09

My 1.8t was misfiring once, I replaced the two ignition cables and problem went away.

23rd April 2014, 20:35	#1
victorgte I really should get out more....... MGTF, MGZT, Range Rover Join Date: Sep 2013 Location: Cheltenham Posts: 2,803 Thanks: 395 Thanked 633 Times in 446 Posts	1.8T misfire almost gone Today I changed the 3 vacuum hoses with nice blue silicone ones. Whilst the misfire under hard acceleration has almost disappeared, there is still a bit of hesitation. Car performs better now but it would be good to find the last piece of the jigsaw and get rid of it totally? __________________ MG TF 135, MG ZT, Range Rover P38

23rd April 2014, 20:40	#3
victorgte I really should get out more....... MGTF, MGZT, Range Rover Join Date: Sep 2013 Location: Cheltenham Posts: 2,803 Thanks: 395 Thanked 633 Times in 446 Posts	Is there an ideal gap? I seem to recall there was something on here last year that suggested a better gap than the book says??????? __________________ MG TF 135, MG ZT, Range Rover P38

23rd April 2014, 20:45	#6
MG Tom Posted a thing or two ex. MG ZT+ Join Date: May 2013 Location: Northampton-ish Posts: 1,484 Thanks: 156 Thanked 98 Times in 95 Posts	I say 0.65mm. I tried 0.8mm and it missed terribly. __________________ '03 MG ZT+ 1.8T X-Power Grey with Monogram 'WTD' black alcantara trim. [SIGPIC][/SIGPIC] My project thread HERE

23rd April 2014, 20:37	#2
suzublu This is my second home rover 75 1.8 vvc club se wedgwood blue Join Date: Aug 2009 Location: Seaton Carew Posts: 26,918 Thanks: 65 Thanked 7,142 Times in 4,642 Posts	Plug gaps

23rd April 2014, 20:41	#4
suzublu This is my second home rover 75 1.8 vvc club se wedgwood blue Join Date: Aug 2009 Location: Seaton Carew Posts: 26,918 Thanks: 65 Thanked 7,142 Times in 4,642 Posts	0.75mm seems to be the best compromise

23rd April 2014, 21:53	#8
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,752 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	If you increase the bore of the hoses on the turbo, it will not perform as it should. The volume of air being transferred through the pipes is part of the calibration. There's at least one recent thread describing the effect. TC

23rd April 2014, 23:09	#10
neilbaker86 Gets stuck in MG ZT Join Date: Jun 2011 Location: Oxford Posts: 847 Thanks: 124 Thanked 312 Times in 147 Posts	My 1.8t was misfiring once, I replaced the two ignition cables and problem went away.