miss fire-just wont go away.HELP

[adamg1]

Hi there i have a clio sport 172 ph1 and it has a miss fire,theres no pattern to the miss fire,sometimes it can be fine for several days then its back,useually after the 1st 2mins of driving.

when it happens its around the 2k rpm mark,if i touch the throttle it just drops its revs but doesnt cut out,it will then backfire,if i pull over and let it idle for around 1 min then set off again it will be fine.

ive fitted magnecor leads,bosch super4s and a new coil pack but with no joy.

if anybody would like to suggest anything please feel free.

 

[Gaz_]

You checked the plug holes for moisture? Can be prone to this, especially in this weather.

 

[kully]

could be a flat spot ?

 

[adamg1]

thanks for your suggestions,how do i check these things out?

 

[kully]

the flat spot will be at the same point on rev range , no real cure that i can think of other than a remap . but i'd look at other possibilities 1st .

 

[adamg1]

the flat spot will be at the same point on rev range , no real cure that i can think of other than a remap . but i'd look at other possibilities 1st .

ok thanks,it doesnt happen all the time though.

 

[spen1104]

I too had an anoying problem changed the plugs the leads went to oe std induction cleaned the throttle body cleaned the fuel system tried everything everyone was saying to me and then some ........


then had a brain wave contacted rentech ordered a part worn lamda sensor and hey presto when fitted the car is like a dream no flat spot or hesitateing on to roundabouts or at t junctions or doing the speed limit on the motorway nearly killing me from time to time its fine and im so happy


cost me 50 notes plus 7 p&p from mike at rentech

 

[jamojamojamo]

I get this sometimes when it rains, get water in around one of the spark plugs

 

[VXR killer]

check your inlet and airbox for oil. had the same prob, found oil in the bottom of my air box from when i over filled me engine with oil.

 

[172cupwizard]

I'd put OEM plugs on! i tried some bosch and changed em after a week.