Anti-drainback and oil pressure light?

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OceanRuns

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The vehicle is a 1986 Toyota Van. The Oil filter mounts near vertically, with the threads facing downward. Filter is a K&N.

-If a drive the van, park it, and restart after about 20 minutes, the oil pressure light comes on for a few seconds.

-If I drive it, shut off, and and then immediately restart, the light goes off immediately.

Should an anti-drainback valve prevent this? Or, does this seem like normal engine operation?
 
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Probably normal, after setting and especially when hot, oil in the galleys will return back to pan... On a cold restart oil hasn't drained from galleys... If oil pressure sender is at end of oiling system it's going to take a few seconds for oil to travel the distance...
 
Is there a "flood clear' mode? Like holding the pedal to the floor cuts the injectors when cranking? If so , just do that if you want to prime it up a bit before starting.
 
"Flood clear" only works with the accelerator flat to the floor. Anything less enables the injectors and it will start. However, you must lift quickly when you do want it to start, or you will get a big rev.
 
Originally Posted By: OceanRuns
The vehicle is a 1986 Toyota Van. The Oil filter mounts near vertically, with the threads facing downward. Filter is a K&N.

-If a drive the van, park it, and restart after about 20 minutes, the oil pressure light comes on for a few seconds.

-If I drive it, shut off, and and then immediately restart, the light goes off immediately.

Should an anti-drainback valve prevent this? Or, does this seem like normal engine operation?


What's a few seconds? It could certainly be a bad ADBV in the filter and has to be filled every cold start.
 
if the filter is vertical why would it drain?

Also flood clear mode on a 1986 toyota van??? not sure.
 
I'm not sure if this vehicle has a flood/clear mode. What exactly does this feature do?
 
Originally Posted By: TFB1
Probably normal, after setting and especially when hot, oil in the galleys will return back to pan... On a cold restart oil hasn't drained from galleys... If oil pressure sender is at end of oiling system it's going to take a few seconds for oil to travel the distance...


-On a cold restart (like first of the day) the van takes a few seconds to turn the oil light off.
-After driving, parking, and waiting 20 minutes = a few seconds also.
-After driving, shutting off, and then restarting immediately = light off much faster.
 
Originally Posted By: Trav
Originally Posted By: OceanRuns
The vehicle is a 1986 Toyota Van. The Oil filter mounts near vertically, with the threads facing downward. Filter is a K&N.

-If a drive the van, park it, and restart after about 20 minutes, the oil pressure light comes on for a few seconds.

-If I drive it, shut off, and and then immediately restart, the light goes off immediately.

Should an anti-drainback valve prevent this? Or, does this seem like normal engine operation?


What's a few seconds? It could certainly be a bad ADBV in the filter and has to be filled every cold start.


Perhaps two, maybe three seconds or so. I didn't time it. But, we're not talking 10 seconds or anything.
 
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How common is it for an anti-drainback valve to fail?

If I am thinking about this properly, it seems to me that a vertical filter with the threads down would pose the greatest challenge for such a feature.
 
Originally Posted By: Rand
if the filter is vertical why would it drain?

Also flood clear mode on a 1986 toyota van??? not sure.


He said..
Quote:
The Oil filter mounts near vertically, with the threads facing downward.

Maybe i am misunderstanding but it sounds like the filter is almost upside down.
If that’s the case then a very small leak will allow it to drain in a short time.
 
Originally Posted By: Trav
Originally Posted By: Rand
if the filter is vertical why would it drain?

Also flood clear mode on a 1986 toyota van??? not sure.


He said..
Quote:
The Oil filter mounts near vertically, with the threads facing downward.

Maybe i am misunderstanding but it sounds like the filter is almost upside down.
If that’s the case then a very small leak will allow it to drain in a short time.


Yes, the filter is basically upside down. That's a better way of saying it.
 
What I see here is a solution that's worse than the disease, try a OEM or other quality filter... If that doesn't work, stick cotton in your ears...

To prelube with starter will probably take 10 seconds or more, allows metal to metal contact far longer than just going ahead and starting it... PLUS you're adding to wear and tear on starter, battery, flywheel etc...
 
Try a different filter brand. Or it may be a defective ADBV on the one you have in there. They are sometimes defective brand new, assembled wrong, or damaged. I know the Denso FTF has a very good working ADBV for flow, with a good seal on the baseplate. It is an upgraded Toyota Denso filter. As for starting, with a fuel injected car you always keep your foot off, don't press the gas pedal and let the system do it's thing until ready to drive. That doesn't seem to be the problem you have, but was talked about.
 
Well, I unscrewed the K&N filter this morning, and not a drop of oil came pouring out.

So much for 'premium' filters eh?

Any thoughts as to whether a non-functional anti-drainback valve on an upside-down filter did any engine damage?

I have a Toyota OEM filter on there now. So, we'll see.
 
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