Misfire possible electrical issue

[zeroasylum]

2002 MK4 golf 1.6l engine code AVU 167000km

Hi all,

A while back I was getting running rich codes and random misfires. Did a full service new intake manifold seals, plugs, ht leads and coil pack and car was running well. Now I have misfires again in cylinders 2 and 3 only. The car is not throwing a CEl but when I connect VCDS and look at measuring bocks 014,015,016 I can see them happen and the count increments. Its weird as the car does not seem shake and drives smoothly. Now for the weird part. If I turn on the AC and the cooling fans turn on the misfires stop. So I am think electrical. I can hear the injectors firing (put a mechanics stethoscope) on each just to be sure. Put some injector cleaner in the tank as well.
I think its electrical maybe a bad earth or possibly a damaged injector loom from year of heat.

One final note when one opens the driver side door and hears a sound is that the throttle body moving or fuel pump priming as I sometimes hear a squeak. I have cleaned the throttle body and when I do an alignment no squeak is heard so it could be the fuel pump.

Advice please.

Thanks

Zeroasylum

[Stan]

not sure about your misfires, but the noise you hear when you open the door is the fuel pump priming

[zeroasylum]

not sure about your misfires, but the noise you hear when you open the door is the fuel pump priming

Thanks for the reply. I thought it was the pump. Yes the misfires are annoying and I am not sure what it could be.

Zeroasylum

[Stan]

could be lots of things, plugs, leads, maf, wiring, cracked but not blown fuse....

the fans and ac wiring are related and also run via the fuse terminal that lives on top of the battery, push down on it with everything running and see if the fans cut in and out. mine did , with no visible damage, and was causing the ac to work intermittently. replaced that and ac is fine now...