Hey not the fastest thing in the world but a good hack ...

2003 1.6 petrol , went round a corner and then it started miss firing

Dragged it back and its firing on 2 & 3 but not 1 and 4 , tried a coil pack and crank sensor but nothing ....

Tried all the fuses there all ok so its not switching on 1 and 4

Anyone came across this before ?

 

had similar, coil pack was fooked,
replaced with working 1, no more missing

 

Have you tried spark plugs and leads.

 

First thing I would do is find out if you've lost spark or fuel. Any DTC's?

 

Duff coil pack. or wiring issue or ecu.

 

tried a new coil pack and crank sensor still the same ...

plugged it in and it said coil pack .....

2 & 3 is working 1 & 4 is not

 

you tried a new coil . brand new ?

 

if you have any test leads or wiring see if you can switch the 2 outer wires on the coil pack plug, then swap leeds 1-4 with 2-3 and see if you get spark on 1-4 and none on 2-3

 

stop throwing bits at the car and diagnose it propperly!!

coilpack witing has 3 wires, centre is feed/gnd

both outers are pulsed signal/triggers

1/4 2/3

while cranking using a test light, see if signal is pulsing on both outer terminals with connector unplugged.


you should get the same result on both outer connectors.

if not then do continuity check on the wiring to PCM, if thats ok then check the pulses at ECU by back probing.

you will find the ECU drivers have failed due to leaving a missfiring coilpack on too long and its fucked it.

Sean.

 

totally what he said.if the three wires from ecu to coil pack are ok then the coil driver in the ecu is fudged.if it is and you replace ecu make sure you put a brand new coil pack on it at same time otherwise it will do the same thing again

 

Do as stated above easiest way is use a noid lamp into the coil pack multi plug and crank the car if u haven't got a noid use a cap less sidelight bulb with wires bent back