DeCaff2007
I'm Awesome
I'm SO confused. The fuel pump doesn't pump oil, why would it have a switch for such a thing?
Regardless, I'll check what's there and it's condition.
Regardless, I'll check what's there and it's condition.
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The OPS on the china rail is a backup to the ECM turning on the fuel pump relay by bypassing it. When it sees ~4 PSI, it'll turn on the pump too. Anyway, the OPS is directly plumbed in to the oiling system. This drawing is for an 88 but it's good for VIN Z (4.3L) too. Again it's for an 88 but, the 2 years are almost the same other than dash and gauges.I'm SO confused. The fuel pump doesn't pump oil, why would it have a switch for such a thing?
Because it looks like the Great Wall of ChinaI did check that ridiculous sensor on the "china" rail. Why is called that, anyway?
See if the EGR valve is holding vacuum.