Hi fellas,

Working on the 420SEL.

I have replaced a bunch of vacuum lines and hoses etc under the hood, chasing a rough idle and middle of the road vac gauge when warm. I seem to have eliminated most of the vac leaks, as the gauge is now mostly to the left except when the A/C is on.

I used my voltmeter across the Diag port,slots 2 and 3 the other day, and it was pegged at 99.99% as soon as I turned the key on (engine off). I remember that it should be 70% or 85% at KOEO to show if its a Federal or Cali Car right? Swapping the negative and positive on the DVOM yields the same results.

So KOER (engine Running) is 99.99% also. No change. I suspected the OVP may have been bad, so I used the voltmeter across the fuses to check for voltage. There was none. Fuse was good, So I picked up a new OVP, plugged it in. Same thing. 99.99 KOEO, and 99.99 KOER.

Any help?

Thanks in advance.

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91 350SD
14 F150 Eco
19 Fusion Hybrid
11 GT500