V6 misfire...

Rob75 · 11th January 2009, 20:49

this has been on my mind for a while now that my car has a slight misfire but i can't work out whats causing it.

the symptoms are when idleing you get a slight judder through the drivers seat and if you rev the car just over 1000 rpm it judders on the way up, past that its fine. and also when cold if i drive it up a smooth bit of road at 40 mph i can still feel it judder slightly but it has no pattern, somtimes it does it somtimes its fine??

i was thinking fuel filter but mine being a feb 2000 car would my fuel filter still come appart?

any help or info would be great.

Tatts · 11th January 2009, 21:16

Quite a few possibilities.

Firstly, I'd check to see if any codes are in the ECU.

When was the car last serviced?

Are there any ticking/clicking sounds coming from the engine?

Whats the overall performance like?

Rob75 · 11th January 2009, 21:30

she had a service at a MGR garage in october which included spark plugs oil, filter, gearbox oil and coolant, plus i had 2 new vis motors fitted before hand.

there is a noise i can hear which comes from around the back of the engine near the flexi exhaust joint so its probally that, the only other ticking noise i can hear is if i overtake somthing and go up to 4000 rpm i can hear a rattle/ ticking noise.

the overall performance is ok, shes very slugish around low throttle up to 60 mph but if i go to half throttle and go to 4000 rpm she does shift alough ive only ever done that twice.

-Joe · 11th January 2009, 22:17

Remove the spark plugs carefully and examine them.

Either a spark plug is faulty or the spark plug colour of the odd one out will reveal what kind
of problem the engine has.

See Haynes manual.

Rob75 · 12th January 2009, 21:36

Right i made a 60 mile round trip to my local mgr garage today for them to have a quick listen and he said its not a misfire as that would put the engine warning light on???? but he did say yes its not running 100% and it sounds like somthings inbalanced? but the strangest thing is that i remember having this problem when i bought the car and one day it just went so i did'nt think anymore of it, also its probally just a coincedence but the day before i ran low on fuel so the next day a bought a fivers worth of fuel in a can to get me to the shell station, she drove fine all the way there and when idleing she was very smooth, it was just when i got back home and put the car into park the problem started again.

Phil · 12th January 2009, 21:46

My car does this, I can feel a slight vibration/imbalance when just breathing on the throttle at idle. The car goes like stink. I was thinking it was a worn ancilliary but it isn't really bothering me at the moment.

chris75 · 13th January 2009, 14:47

Quote:

Originally Posted by Rob75

i was thinking fuel filter but mine being a feb 2000 car would my fuel filter still come appart?

.

No , the cars before and upto 2001 appear to have had a clip-together filter which does not unscrew like the later ones . By the way, I love the colour of your leather !

Rob75 · 13th January 2009, 19:07

Thanks chris.

Rob75 · 23rd January 2009, 22:47

sorry to bring up an old thread again but the (misfire?) has got a little worse. i can feel it when driving the car now not just in park/neutral, she's been parked up for the last week and was sort of driving ok before hand, i realy need to get her sorted as i have the midlands meet to attend to next week and i realy don't want to drive her up like she is, please help.

The only temporary fix i have at the moment is beer, but supplies are running low.

also is it true that even a slight missfire will put the engine check light on?

Rob75 · 24th January 2009, 01:21

also when i had a look at the air filter on thursday it looked a little black and i found this in the rubber tube.....

oil looks clean coming out of the throttle body

I've checked the engine oil and its still ruby red (mobil oil) after 6000 miles, and the coolants still clean alough has discoloured slightly but no signs of oil in there so i've ruled out the possibility of hgf.

11th January 2009, 20:49	#1
Rob75 Gets stuck in Jaguar Join Date: May 2008 Location: wellington, somerset Posts: 905 Thanks: 0 Thanked 0 Times in 0 Posts	V6 misfire... this has been on my mind for a while now that my car has a slight misfire but i can't work out whats causing it. the symptoms are when idleing you get a slight judder through the drivers seat and if you rev the car just over 1000 rpm it judders on the way up, past that its fine. and also when cold if i drive it up a smooth bit of road at 40 mph i can still feel it judder slightly but it has no pattern, somtimes it does it somtimes its fine?? i was thinking fuel filter but mine being a feb 2000 car would my fuel filter still come appart? any help or info would be great. __________________ [SIGPIC][/SIGPIC]

11th January 2009, 21:16	#2
Tatts This is my second home MG6 TL Join Date: Nov 2006 Location: Tarn Posts: 5,269 Thanks: 2 Thanked 46 Times in 37 Posts	Quite a few possibilities. Firstly, I'd check to see if any codes are in the ECU. When was the car last serviced? Are there any ticking/clicking sounds coming from the engine? Whats the overall performance like? __________________ http://www.wcgsig.com/115562.gif

11th January 2009, 21:30	#3
Rob75 Gets stuck in Jaguar Join Date: May 2008 Location: wellington, somerset Posts: 905 Thanks: 0 Thanked 0 Times in 0 Posts	she had a service at a MGR garage in october which included spark plugs oil, filter, gearbox oil and coolant, plus i had 2 new vis motors fitted before hand. there is a noise i can hear which comes from around the back of the engine near the flexi exhaust joint so its probally that, the only other ticking noise i can hear is if i overtake somthing and go up to 4000 rpm i can hear a rattle/ ticking noise. the overall performance is ok, shes very slugish around low throttle up to 60 mph but if i go to half throttle and go to 4000 rpm she does shift alough ive only ever done that twice. __________________ [SIGPIC][/SIGPIC]

11th January 2009, 22:17	#4
-Joe Avid contributor Rover 75 Classic SE 1.8T Join Date: Dec 2008 Location: wink Posts: 135 Thanks: 0 Thanked 20 Times in 15 Posts	what to do Remove the spark plugs carefully and examine them. Either a spark plug is faulty or the spark plug colour of the odd one out will reveal what kind of problem the engine has. See Haynes manual.

12th January 2009, 21:36	#5
Rob75 Gets stuck in Jaguar Join Date: May 2008 Location: wellington, somerset Posts: 905 Thanks: 0 Thanked 0 Times in 0 Posts	Right i made a 60 mile round trip to my local mgr garage today for them to have a quick listen and he said its not a misfire as that would put the engine warning light on???? but he did say yes its not running 100% and it sounds like somthings inbalanced? but the strangest thing is that i remember having this problem when i bought the car and one day it just went so i did'nt think anymore of it, also its probally just a coincedence but the day before i ran low on fuel so the next day a bought a fivers worth of fuel in a can to get me to the shell station, she drove fine all the way there and when idleing she was very smooth, it was just when i got back home and put the car into park the problem started again. __________________ [SIGPIC][/SIGPIC]

12th January 2009, 21:46	#6
Phil This is my second home Rover 75 CDT Connoisseur SE Join Date: Nov 2006 Location: Wales Posts: 12,227 Thanks: 469 Thanked 523 Times in 241 Posts	My car does this, I can feel a slight vibration/imbalance when just breathing on the throttle at idle. The car goes like stink. I was thinking it was a worn ancilliary but it isn't really bothering me at the moment. __________________

13th January 2009, 19:07	#8
Rob75 Gets stuck in Jaguar Join Date: May 2008 Location: wellington, somerset Posts: 905 Thanks: 0 Thanked 0 Times in 0 Posts	Thanks chris. __________________ [SIGPIC][/SIGPIC]

23rd January 2009, 22:47	#9
Rob75 Gets stuck in Jaguar Join Date: May 2008 Location: wellington, somerset Posts: 905 Thanks: 0 Thanked 0 Times in 0 Posts	sorry to bring up an old thread again but the (misfire?) has got a little worse. i can feel it when driving the car now not just in park/neutral, she's been parked up for the last week and was sort of driving ok before hand, i realy need to get her sorted as i have the midlands meet to attend to next week and i realy don't want to drive her up like she is, please help. The only temporary fix i have at the moment is beer, but supplies are running low. also is it true that even a slight missfire will put the engine check light on? __________________ [SIGPIC][/SIGPIC]

24th January 2009, 01:21	#10
Rob75 Gets stuck in Jaguar Join Date: May 2008 Location: wellington, somerset Posts: 905 Thanks: 0 Thanked 0 Times in 0 Posts	also when i had a look at the air filter on thursday it looked a little black and i found this in the rubber tube..... oil looks clean coming out of the throttle body I've checked the engine oil and its still ruby red (mobil oil) after 6000 miles, and the coolants still clean alough has discoloured slightly but no signs of oil in there so i've ruled out the possibility of hgf. __________________ [SIGPIC][/SIGPIC]