97 Aurora Speedo/Cruise Control VSS Issues
So my Aurora has been running just fine up until my radiator started leaking. Patched it just fine 2 days ago and haven't had any issues since, has never run better.
Yesterday I hosed down the engine compartment since the engine was covered in antifreeze - no problems after that at all, some condensation got into the headlight housing and a bulb blew but it could have been a coincidence. It dried quickly in the sun and I did not drive it until it was completely dry so I doubt that has much to do with the problem.
Today, I installed the new bulbs and sprayed a bit (okay, maybe a lot) of Fluid Film on the bolts and other moving parts. When I started the car and started driving, I noticed the speedometer jumping around, sometimes just going to zero as though there is an intermittent connection. It then stayed at 0 and I drove it back home to take a closer look.
Pulled out my code reader and sure enough, there was P1642 I think, something to do with the VSS sensor signal.
Though Fluid Film is supposed to be non-conductive, I thought it may be affecting a ground. So, I went back and sprayed all the ground bolts and wires and pretty much anything electrically related with MAF cleaner and that got rid of any residue.
It seemed to have helped, though the speedometer still moves slowly when going back down to zero. I'm still getting occasional dropouts and sometimes it starts jumping again.
The cruise control does not work - when I press the button, the "cruise" light comes on for as long as I hold down the button but it does not actually activate. At 40km/hr or below it does not come on at all, which is normal, of course.
The onboard computer reports intermittent very low fuel consumption even though I am driving uphill. The odometer seems to work just fine.
On the highway, the car once jumped into 3rd gear even though it'* never done that before.
I can't get the VSS sensor code to come back up even after the mis-shift.
So I'm pretty sure somewhere a wire to the VSS sensor must be damaged - where should I look? Should I just leave it in hopes it'll cure itself after a couple hours of sitting? Spray some more cleaner? Hose down the engine again?
Thanks so much!