Engine Misfire

[Barron]

After driving my 172 yesterday everything seemed fine but today when i took it out it seems to have a misfire :S Seems to be running on 2-3 cylinders and its running lumpy. Ive read a few posts on here and seems to be the coilpack, ive got a spare coil pack so i will be trying that later on today. The plugs are brand new so it isnt them.

Any other ideas before i take to renault to get it looked out with a dianostic computer?

thanks
carl

 

[Barron]

bump

 

[Terry172]

I would try the spare coil pack before paying Renault mate

 

[Barron]

right, tried the coil pack and it is still doing the same. any ideas?

/carl

 

[Barron]

another update, the car is misfiring on low rev's 1k-3k. Seems to be running on 3 cylinders. changed the coilpack and changed the plugs. the engine management light comes on after so long when driving it.

/carl

 

[clio52]

i had this the other day.
you need to remove the inlet manifold to get to the plugs i beleave and its easy to catch the ht lead in the gap when refitting this then breaks down the signel hence the runnin on 3 cylinders. easy way to check is have the car running and with a insulated pair of grips remove each lead from the coil pack one by one. if its the bottom right hand one its the longest lead as you look at the block its the firthest to the right. thats the same as mine. if so its a ht lead thas causing your problems

 

[alanm78]

mine had the same prob,i changed plugs leads and coil pack,no diff so then changed the lambda sensor and it sorted it,cost about £50 fitted it myself,easy job 2 do.
best thing to do is take it to a local garage with a diagnostic machine that way if it is electrical it will show up on the machine.