ford 3.0 low oil pres sen. keep from starting?

[Ken Ezzell]

My question is….. On a 95 ford 3.0 v6 engine…
will low oil pressure keep the engine from start.

it will start with starting fluid and run great

iv read that other ford engines, new ones, will not start with low oil pressure
or a faulty sensor. Does mine have this feature.

Ive done a lot of trouble shooting posted here…. http://www.ericthecarguy.com/kunena/8-Service-and-Repair-Questions-Answered-Here/55648-update-bringing-a-1995-taurus-back-to-life

please read that posting too.

Thanks

Topic

[Bluesnut]

Very few cars have a low oil pressure switch to cut off the fuel pump. That was commonly used on GM cars about 20 years ago or even further. I currently own Fords and have owned several 3.0 engines in the past. They do not have this feature.

Check the diagnostic link connector. I think this car has a single plug that is tan with a green stripe. Run a jumper wire from that plug to ground somewhere on the body or engine.
You should hear the fuel pump run and the engine should start and run. This is a test only; do not leave that jumper in place.

That particular wire is a splice from the wire that grounds the trigger circuit of the fuel pump relay to the ECM.

If the car runs with the jumper then what needs to be determined is whether or not the ignition module is sending a signal to the ECM or whether the ground circuit for that tan wire inside the ECM has failed.

When you turn the key on that ground circuit in the ECM is closed and operates the pump relay. After a couple of seconds the ground goes away if the engine is not cranked by the starter. Once cranking with the starter begins the ground circuit is closed again and triggers the relay to energize the fuel pump.

You might post back with results as I hate to pile on too much here in one shot.

[Ken Ezzell]

Thanks for your feed back… Its been raining here for days now, not able to work on it.

Have you had the opportunity to read my original forum post at http://www.ericthecarguy.com/kunena/8-Service-and-Repair-Questions-Answered-Here/55648-update-bringing-a-1995-taurus-back-to-life

I cant seem to get the codes to flash…be done it by the book and online vids…but nothing

There is fuel pressure, 40psi, when KOEO and 34 after Started with either. And runs pretty smooth for 150k. the spark plugs are clean and gapped. I replaced the fuel pressure reg and inline filter.

One thing that is nagging me is that the fuel pressure dose not jump up by 10 as the book says it should when vac line is remove…it some time jumps by 5 bt some times not at all.

Vacuum is with in range and is close to being steady. Im not sure about the EGR valve…. that vac line has very little pull on it. When i pull vac by hand pump on the EGR, the rmps go way down. Is this normal?

What bugs me is how can the engine start with starting fluid by not by the cars fuel, bt yet run good on it after it is started.

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