Cylinder reference number 1 - Saxperience

elmartha · 18th February 2018, 16:53

Hi guys, my 02 plate vts has got major issues. When you start it up it will run sweet as anything but then after 30 seconds it runs on 3 cylinders then just keeps flicking between 3 and 4. Plugged it in and I got a knock sensor error code and a cylinder reference number 1 code. It's had a new knock sensor fitted (the old one was cracked) new coilpack and fresh fuel put in. Could it be the injector? Thanks, Elliott

crpt2008 · 18th February 2018, 17:34

Hi elmartha I would be very suspicious of the injector(s) and ignition coil.
Yes I noticed you mentioned it's new, but have you checked it before commission it into service? :-)

elmartha · 18th February 2018, 18:08

I've had 3 different coil packs on now and everyone does the same, turn it off and leave it 30 seconds and then runs sweet again. I was hoping it wasn't going to be an injector. Once you restart the car if you get it above 2k rpm it stays on all 4 it's only when the revs drop down it loses a cylinder

stevo67 · 18th February 2018, 18:29

Check your wiring loom for breaks.

MartinObviously · 18th February 2018, 19:15

Could be a lambda sensor

When you first start the car it'll be running in open loop. then when it switches to closed loop it's shitting itself because it'll be getting incorrect readings from the sensor. It'll be the sensor nearest the cylinder head if you have 2 sensors.

elmartha · 18th February 2018, 20:30

I've had this fault before and it was the top lambda. Thing is when it happened before it's because I had burnt through the wires/melted them onto my manifold. I unplugged it and it didn't change anything.
As for breaks in the wiring harness, it all seems good. It's not long since had a new loom put in and was running great until I parked it up over winter!