Been to croft today and the car is suffering from a very bad misfire.

The car was set-up 200 miles ago which included a new chip, new cps, new rotor, new plugs, new fuel reg.

The problem is from around 1500rpm and ranges intermittently through to 3300rpm. As you can imagine it's very difficult to drive.

I've replaced the plugs with a new set of 071's and exactly the same.

The car when first started runs very lumpy when driven slow

Any ideas???

 

Try some different plugs in mate, 071C's are iffy at the minute.

 

You say you replaced rota but what about the cap it self mine did this as it had a hairline crack and was arking out

hope you get it sorted

 

Plugs are fine, both sets are really as one set are only 500 miles old and a new set.

Everything was fine when it was tuned 2 weeks ago

 

The 071'Cs have been dodgy recently, there have been loads having issues caused by the "seemingly fine" plugs.

Check the cap too as said above.

Ring your tuner to see if they can offer any advice too.

 

Phase sensor?

 

Are you smelling unburnt petrol when it's misfiring?

 

Yes mate,

I took the car for the set-up and after the drive back the car was put in the garage, it was then removed next to go to the bodyshop for some more work and an MOT

Thats when it started running funny on the way there, so i dropped off and the body work was done, it went in for it's MOT and failed on tick over as it was ticking over @ 1500+ but was put through as they know the car and it would be sorted.

I started the car to come home and it sounded to me that it was firing on 3 cyl and you could smell fuel under the bonnet and out the back very bad (no leaks under bonnet) then after a minute it cleared and ran on all cyl but was misfiring, i checked the plugs that were in it and they looked fine with correct gaps which were tested at the tuners, so i bought another set and exactly the same no different.

I can smell fuel but have no idea what it is, it's a bit of a pain as i have topped my budget on this car until i can build my savings up so i don't want to start chancing parts that aren't broken, i thought it would run spot on after i had it set-up but it's running worse.

 

Everything could have bene ok yesterday but that means fuck all. Dizzy cap would be my guess. HAd exactly the same symptoms.

 

if you get stuck fella i've got plenty of spares at mine which i would happy to try and fit for you?

But i'd try removing the dizzy cap make sure no moisture has got in there make sure your loom is ok try removing injectors wiring and see if problem still there, then try the plug on the same cylinder, if you got a spare Cap try that aswell, have you washed the engine bay down recently

 

Look to see if the CTS wiring is ok.
tabetha

 

Cheers lads i'm gonna get it out and have a look around, cheers for the offer Matt if i can't find the problem i may pop over and see if we can discover whats the cause.

Tabs whats that you mentioned mate??

 

ok pal got a full set of spares at mine and equipment to check loom etc

Phase sensor pal check there is no water or damp inside dizzy

 

i think i am having the same problem as you mines in the 1500 rpm up2 about 3000 rpm acts funny but when it gets past it it flysi checked all them things aswell but when i bought the my 3 door it was like that i have been told to change my ecu so away to do that after full rebuild(just to get this prob sorted gutted some one says a phase sensor it cant be that or the car would not start when did you last change your leads it my possibley be leads?

 

Fitted a new cap and it drives better without missing, it's not perfect so i'm goiong to replace the leads as well.

Thanks for all the info and offers to help, your not a bad bunch