More Oil Pressure Problems

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Jan 2, 2010 | 10:20 AM

#16

dschuffert

Laughing Gas

Joined: May 2005

Posts: 1,082

Likes: 1

From: Illinois

Quote:

Originally Posted by bpounds

I don't think it does. I'm basing that on a study of the schematic. The EOP switch is one of the few sensors that does not feed the PCM. It feeds directly to the instrument cluster. Now it's possible that the cluster relays data to the PCM, but I don't think it does.

Other sensors that feed directly to the cluster include the brake fluid level switch, air filter minder, fuel level sender.

I bet you could unplug your oil pressure switch and the PCM would happily continue to run your engine. Anyone care to try?

I think this confirms it:

This is a great post. Essentially the factory oil pressure gauge on the dash is an 'idiot light'. If pressure reads 7psi or greater is shows normal on the gauge. Below 6psi the gauge will read 0. There is no variable gauge position based on variable oil pressure. This is a good reason to put in a real oil pressure gauge, if you really want to monitor actual oil pressure.

Jan 2, 2010 | 10:26 AM

#17

bpounds

Hotshot

Joined: Aug 2006

Posts: 17,398

Likes: 317

From: Whittier, CA

Quote:

Originally Posted by dschuffert

This is a good reason to put in a real oil pressure gauge, if you really want to monitor actual oil pressure.

Yes, and it is a drawback to the OBD monitor style gauges.

Jan 2, 2010 | 11:59 AM

#18

bismic

Fleet Owner

Joined: Nov 2003

Posts: 27,893

Likes: 3,611

Quote:

Originally Posted by gearloose1

C) If oil pressure were to drop, other sensors that the PCM reads will signal trouble (e.g. ICP, coolant temperature) soon enough.

If oil pressure drops (LPOP issues or significant leak), you will not fire your injectors because of the resulting low pressure in the HPO system. The engine will not run.

Bill - great research -- thanks.

I thought I remembered the DashDaq being able to provide a "low pressure" oil pressure reading. I guess not.

Jan 2, 2010 | 05:17 PM

#19

cheezit

Post Fiend

Joined: Oct 2009

Posts: 12,123

Likes: 35

From: N. Fort Worth, tx

Quote:

Originally Posted by bismic

this is not exactly true. it is possible to have a large enugh leak on the high side to make the low side drop to 0psi at idle and the truck will still run because its able to meet the min spec of 500 psi and will have just enugh volume as well. It may go nostart when hot but even then not all will.
this happens on the early style pumps with the cast covers when the pop out the swedged in ballbearing.