Hot start problem

[Magnum PD]

Computers, sensors or regulators don't have anything to do with oil not getting to the HPO Rez. You have to pull the harmonic balancer to get to the lpop.

Pulling the block to replace the LPOP?????? That's a new one.

 

[Patrick Feeley]

If the IPR isn't powering up, the reservoir will just drain when you crank it (at least that's what my 94 did when the PCM wouldn't provide the ground for the IPR Power Circuit, P1283). I would check the LPOP with a mechanical gauge plumbed in the port down by the oil filter. Cheers!

 

[1995f2507.3]

On riffraffs website they have the melling m208 lpop. Would this be a good replacement? Truck is all stock but have plans for injectors if I keep the truck for a little while. Or should I just try and get a oem one?


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[Magnum PD]

The melling is a good pump. Just need to see what's going on.

 

[gnxtc2]

Does the truck start cold?

If hot start is your problem, check IPR (wiring/o-rings) and injector o-rings.

Prior to your hot start issue, did you notice an extended crank prior to the motor starting?

Gotta diagnosis your issue prior to throwing parts at it. Everyone wants to throw parts at their truck and not diagnosis. Get yourself a mechanical oil pressure gauge to rule out the LPOP. Also get yourself a 3000 psi hydraulic gauge to test the HPOP. Very easy things to do.

Billy T.
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[1995f2507.3]

I have 0 psi coming from the hpop gauge. The truck doesn't even start cold anymore and yes I'd have to crank it for a while but I'd always carry a spare icp sensor and when I put it on it'd start almost immediately


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[gnxtc2]

What is the engine oil pressure?

With a bad ICP sensor, the ECM will go into default mode and start.

Billy T.
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[Magnum PD]

You got the gauge then?

 

[1995f2507.3]

What is the engine oil pressure?

With a bad ICP sensor, the ECM will go into default mode and start.

Billy T.
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From the hpop the gauge there reads 0 while cranking. Doesn't move at all off of 0


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[JCart]

Does the truck start cold?

If hot start is your problem, check IPR (wiring/o-rings) and injector o-rings.

Prior to your hot start issue, did you notice an extended crank prior to the motor starting?

Gotta diagnosis your issue prior to throwing parts at it. Everyone wants to throw parts at their truck and not diagnosis. Get yourself a mechanical oil pressure gauge to rule out the LPOP. Also get yourself a 3000 psi hydraulic gauge to test the HPOP. Very easy things to do.

Billy T.
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^^^ what Billy said....

When cranking make sure the HPOP reservoir is full of oil, as it would appear it has drained, letting air potentially into the system. Charge your batteries to full capacity, fill the HPOP Reservoir through the top plug driver's side of the reservoir.

 

[1995f2507.3]

I put oil in the hpop res and she started right up no problem


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[Magnum PD]

Just once? Once you shut it down and restart it, it will probably die because the hpop drained the Rez.

 

[1995f2507.3]

I shut it off then restarted it. It was a long crank to get it back started but it started 3 times after the first shut off.


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[1995f2507.3]

I filled the hpop res. About 3/4 of the way as that's as much oil I had laying around and now checking it, it's sitting right at the top of the res.


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[lincolnlocker]

low pressure oil pump.. put a mechanical gauge in the port above oil filter and see how much pressure if any it has...

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[gnxtc2]

Or a major HPO leak.

Billy T.
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[1995f2507.3]

It seems to be making oil pressure( on the dash) when cranking it'll move to the L, then fire up. I will put my mechanical gauge on it tomorrow and see what the pressures are like.


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[lincolnlocker]

Or a major HPO leak.

Billy T.
[email protected]

that type of leak that would empty the hpop res would mean that there wasn't any lines or plugs or ipr in the hpop letting it bleed out completely and covery the motor.. he even said that at one point he cranked and cranked on it then inspected the res and it was empty..

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[Magnum PD]

That's his problem^^

 

[1995f2507.3]

Could the lpop not be spinning fast enough to create enough pressure? My starter is pretty old.


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