Went out to the car this morning and it started up with a misfire !

Had the ptu off and cleaned all the injectors plugs off and cleaned!

It seem like it's running on 4 if I pull one of the coil leads off it makes no diff and if do it on the other side it does nothing also??

 

If your stood in front looking at the car it's the first 1 on your left and I'm pretty sure it was the 3rd on the left that did nothing when pulled?

 

Do they have limp mode when there's a fault and go down to 4 ?

But I'm still stumped on what's causing the misfire

 

help please :)

It was ment to be the 3rd on the right not left :)

No dedicated limp home that switches off seperate cylinders, simply the cylinders effected have either a spark issue or a fuel issue, check spark with a spare plug sitting on the plenum with the coil pack pluged into it, start engine and see whats happening.

 

If no spark swap coil packs with an adjacent working one, if still no spark go back to the ptu conections.

 

Fuel injectors clean and close up connectors, listen to each one whilst moving the connector,

 

Jeff TT

cheers jeff

i have had all the plugs out aswell and they all look even and swapped coil pack with others.

will checking the fault codes help me or will it not pick up this typr of fault?

Quick up date, been back to look again and it's the first pack on either side if I pull off do nothing but the back four do ?

Quick up date, been back to look again and it's the first pack on either side if I pull off do nothing but the back four do ?

 

Ok at least they are easy to get to, pain when its the back cylinders!!

As far as fault codes, it will not help you with this particular issue, you still need to establish 100% if its is either a fuel or spark issue, as you have moved the coil packs about and the plugs all seem in similar condition then its likely the injectors have bad connections despite cleaning them, try listening to them by using a long screw driver on them and your ear on the handle, move the connector about see if you can hear a change.

 

 

Jeff

Fault codes wont tell you anything if the cylinder is not firing due to faulty coil pack/injector

 

Have you tried swapping coil packs round to see if the problem moves with the coil pack, pull the coilpack out connect the plug to the end of it and see if it sparks, as been said its either fuel or ignition fault, could be a harness problem, more likely something daft for 2 to go down together, do you have a spare ptu to try

just been out with the screw driver and the sound fine if i move the wires around still click away nicely.

im thinking ptu but dont have a spare or anyone i can swap with, do they come apart?

I have a spare one but down in Portsmouth.

As previously stated, swap a known working coil pack with one of those that isn't firing. If the problem transfers to the other cylinder that was previously working, you have a dead coil pack. If on the other hand the original cylinder still fails to fire, this would point to an electrical fault. Have you an Ohm meter available?

right thanks for all the input guy

 

turned out to be one broken wire on the left side coil pack and broken conecter on the right side injector! WTF is what i said as well

God only knows why they both packed up this morning? maybe karma because i laughed at a chav that got a smack in the face at McDs by an old dear yesterday :)

Problem solved.:thumbup1: The wiring gets such a hammering from the engine heat and gets very brittle.

:hammer: tell me about it bud, ive never seen them so bad almost like glass

Were the wires phsically broken? or a break under the insulation?

I was looking at the casing and part of it runs under the filler cap and looked depressed, so I cut it back to show the wire and it had gone hard from the heat and snaped in my hand as I wiggled it.