Multiple Misfire / Oil cylinder 1

EvylRat

Active Member
Jan 9, 2016
6
0
Arosa 1.0 mpi, engine code AUC.

My Vgate is reporting;
Multiple misfires
Misfire cylinder 1
Potentiometer for EGR Implausible Signal

The symptoms; juddery, lumpy, idle RPM keeps dropping, power loss.
Last year when this happened I replaced 4 sparkies (2 had been destroyed) and the HT leads.
This year I replaced the coil. I've tried the old leads back on. Then last night I checked the spark plugs again; cylinder 1 spark plug was covered in oil (small amount of oil in the spark plug well too), and cylinder 3 spark plug had a hard white/grey deposit on it.
I replaced the oily spark plug and scraped the deposit off the other. Car ran fine round the block.

This morning, all the error messages are back and it runs rough. I'll pull the spark plug out later, I suspect it's covered in oil already.

What is the likely culprit for that?
 

Delfine

Active Member
Nov 8, 2015
4
0
worn piston rings possibly ? does it use much oil ? I'd do a compression check
 

EvylRat

Active Member
Jan 9, 2016
6
0
worn piston rings possibly ? does it use much oil ? I'd do a compression check
Doesn't use that much oil (compared to my bug anyway). I've got some tinkering to do at the weekend then. Thanks for the reply.
 
AP Autostyling