On Sun, Jan 24, 2010 at 10:51 AM, mark drillock <mdrillock@cox.net> wrote: > Not so fast. The idle valve behavior depends on the version of the FI > wiring harness. Lots of later vans power it from the fuel pump relay and so > on those vans it WON'T hum with just the key on, the engine needs to be > running for it to continuously hum. > > Years 86/87 power it from the ECU relay and on those vans it should hum > whenever the key is on, engine running or not. > > Yes, I don't know why I put "not running" in there when I meant just "running". Both my 90 vans have quiet ISVs when not running. Interesting to know about the 86-87's though.... -- John Bange |
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