G'day gents. I thought I'd share a happy breakdown story for once.
I went to drive home after work the other day and noticed that my idle dropped to around 300rpm when stopped at the lights. Thinking the worst, I pulled over at the next servo and popped the bonnet to see the damage. Everything looked fine - electrical connectors looked fine and everything sounded normal - apart from the low idle. I didn't have a CEL and it wasn't running rough so I was feeling a little better about things.
I was hoping that it was just my ISC motor playing up - when my old TR Magna started idling low it turned out to be the ISC, so I was pretty confident that that was the issue.
I managed to heel-toe it all the way home through peak hour traffic.
Once home I wound the BISS screw out which raised the base idle slightly - I was happy seeing this. Also plugged in my datalogger and the ISC motor wasn't reporting back anything.
Luckily I bought a spare ISC about a year ago from ebay for about $90. I found it in my stash of parts, swapped it over last night and my car is running absolutely fine now.
It pays with these cars to have spares on hand!
Hooray for having spare parts
