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#3574617 - 03/15/17 11:16 AM Low/no oil pressure at start
Towncar281 Offline
n00b

Registered: 12/06/16
Posts: 13
Loc: Pasadena, CA
Hi guys,
I have a 94 Town Car with 96,000 miles on it and sporadically when I start it the oil light will stay on for up to a minute or two. I've searched the forum and can't seem to find someone with the same problem. I do not think it is just a problem with the warning light because the engine is noticibly louder until light goes out (clatters). The oil level is fine and it seems to do it most frequently when parked with nose facing slightly up hill. What could it be? I have stopped driving it.

Thanks

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#3574649 - 03/15/17 11:37 AM Re: Low/no oil pressure at start [Re: Towncar281]
Rainyp71 Offline
Climber

Registered: 04/14/13
Posts: 835
Loc: North Carolina, USA
Are you running a stock fomoco oil filter? Some cheaper filters do not have a drainback valve and allow oil to drain out of the block back into the pan allowing for startup without oil in critical areas for a second or two.
_________________________
Click to reveal...

2000 P71 Crown Vic former Gordonsville, VA Police with 164,xxx Miles
GMAX As-03 tires, custom trunk false floor, autometer tach, kenwood head unit, ADTR and AFE intake, KYBs all around

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#3574673 - 03/15/17 11:51 AM Re: Low/no oil pressure at start [Re: Rainyp71]
Towncar281 Offline
n00b

Registered: 12/06/16
Posts: 13
Loc: Pasadena, CA
No I'm not. I'll buy the Ford one but this problem can go on for much longer than a second or two.

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#3574689 - 03/15/17 11:57 AM Re: Low/no oil pressure at start [Re: Towncar281]
Rootintootin Offline
Member

Registered: 02/26/08
Posts: 351
Loc: North Carolina
Does it happen only when cold or at any temperature at random? You (or your mechanic)might want to put an actual oil pressure gauge on the motor, to see if the numbers are within specs.

When I get this on my Harley, it's because I put on an aftermarket oil filter that either doesn't have an anti-drainback valve or one that doesn't work up to standards. Trying to be cheap and save a few bucks. I always end up buying the right one eventually.

You could try one of those miracle additives to cure what ailes the oiling system. I have had some luck with the Rislone stuff that comes in the yellow bottle. It's kinda blueish, greenish color. Not a pitch for any product. You might have one you already use.

Not knowing your history with the car, are you sure you have the correct dipstick? If it is wrong and too long, could cause an unwitting low oil condition.

Just things to think about.


Edited by Rootintootin (03/15/17 12:59 PM)
Edit Reason: a touch of OTD
_________________________
97 CVPI(Ex. Tampa PD #715), 120K miles, performance Torque converter, J-modded valve body. Monroe Gas Magnum Severe Duty shocks, Ported Plenum and 70mm FRPP Throttle body

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#3574697 - 03/15/17 12:03 PM Re: Low/no oil pressure at start [Re: Rainyp71]
GrandMarq9807 Offline
Over the Hill

Registered: 05/10/10
Posts: 3826
Loc: Virginia
Originally Posted By Rainyp71
Are you running a stock fomoco oil filter? Some cheaper filters do not have a drainback valve and allow oil to drain out of the block back into the pan allowing for startup without oil in critical areas for a second or two.

You DON'T want drainback, you DO want a filter with ANTI-DRAINBACK...

To meet warranty requirements the valve is required and probably all on market do have this feature... Problem is does it actually function as Ford intended??? Even if defective, the engine should build pressure within 10-15 seconds...
_________________________
1998 Grand Marquis LS. 76K mi.
2007 Grand Marquis GS. 77K mi.
1996 F-150 XLT 5.0 E4OD 189K mi
1988 Turbo Coupe 331 AOD & 3.73
1969 Fairlane Cobra 428CJ 4-Speed
1972 Comet GT - 306 C4 <<< Under Hood



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#3574713 - 03/15/17 12:11 PM Re: Low/no oil pressure at start [Re: Towncar281]
BigMerc96 Offline

I know nothing
Posting Addict

Registered: 06/05/10
Posts: 16132
Loc: I can see Detroit from here!
First thing you need to do is get a Motorcraft oil filter on there. As has already been pointed out, some aftermarket oil filters allow the oil to drain back into the pan when the car sits, so they'll clatter and make a ton of noise until the oil pumps back up to the heads an pumps up the timing chain tensioners. Whenever you have this problem on a 4.6, or any OHC engine for that matter, and its not from low oil the first suspect is the oil filter. These motors just seem to be especially picky about it. And not every 4.6 will do this, some never do even with the cheapest filter you can find (like my '97), but others will (my '96, '98, my Dad's E150, my buddy's '05). 9 times out of 10, using a filter with a properly designed anti-drainback valve will solve it. For a Ford, luckily for us, the Motorcraft filter is readily available and can be had for ~$4 many places, including WalMart.
_________________________
-Steve

1998 Mercury Grand Marquis LS HPP ~88k miles, stock for now.

1997 Town Car Cartier ~140k miles, 70mm TB, Ported Plenum, Gutted Airbox, Mechanical Fan Delete, Contour E-fan Retrofit, Dual exhaust with Magnaflows, rear cat delete, MSD Ignition, KYB Gas-A-Justs, Marauder/HPP rear sway bar, P71 front bar, air ride reinstated, Blinker Mod, Projector retrofit, Caddy 4-note horn retrofit, Wood rim steering wheel retrofit, natural weight reduction.. Smashed 1/13/13....I fixt it..
1996 Mercury Grand Marquis GS 117,485mi. R.I.P. 7/14/12 frown
Originally Posted By s33k3r
I hate CAFE. I'm all for using up every last drip of oil on Earth, as quickly as possible. If there's no more oil/gas, you will get a green Earth that much faster...

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#3574745 - 03/15/17 12:27 PM Re: Low/no oil pressure at start [Re: Towncar281]
RF_Overlord Offline
Over the Hill

Registered: 12/14/02
Posts: 4562
Loc: MA
The idiot light switch is set to trigger when the pressure is approx 6 lbs. Put a real oil pressure gauge on it and see what you actually have.
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen

'00 Grand Marquis GS (Silver)
No ABS, no RAS, no Traction Control, manual HVAC,
single exhaust, 2.73 open, and an ugly-ass landau roof.
Exactly what I wanted in a DD: simple.

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#3574921 - 03/15/17 01:44 PM Re: Low/no oil pressure at start [Re: RF_Overlord]
Towncar281 Offline
n00b

Registered: 12/06/16
Posts: 13
Loc: Pasadena, CA
Thanks guys. I'll switch out the filter ASAP. The issue did seem to get worse after I changed the oil. I have a brand new oil pressure gauge from a previous project. Where can I pipe this in?

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#3574969 - 03/15/17 02:36 PM Re: Low/no oil pressure at start [Re: Towncar281]
RF_Overlord Offline
Over the Hill

Registered: 12/14/02
Posts: 4562
Loc: MA
There's a pipe-plug in the oil filter adapter. You can also put it in place of the idiot-light switch temporarily.
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen

'00 Grand Marquis GS (Silver)
No ABS, no RAS, no Traction Control, manual HVAC,
single exhaust, 2.73 open, and an ugly-ass landau roof.
Exactly what I wanted in a DD: simple.

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#3581529 - 03/20/17 05:15 PM Re: Low/no oil pressure at start [Re: Towncar281]
Towncar281 Offline
n00b

Registered: 12/06/16
Posts: 13
Loc: Pasadena, CA
Okay guys, thanks for your help. I switched out the Idiot light for a oil pressure gauge and put on motorcraft oil filter on. The car gets crazy oil pressure. 40 pounds at idle and goes off the gauge(over 100 psi) when I rev it. Is that normal with these engines?


Edited by Towncar281 (03/20/17 05:41 PM)

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#3581585 - 03/20/17 07:01 PM Re: Low/no oil pressure at start [Re: Towncar281]
RF_Overlord Offline
Over the Hill

Registered: 12/14/02
Posts: 4562
Loc: MA
Yessir. My Marauder will make over 100 lbs on a cold start and even when fully warmed up will read 25 lbs idling in gear at a stoplight. Normal cruise (40 MPH or so) is about 50-60 lbs.
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen

'00 Grand Marquis GS (Silver)
No ABS, no RAS, no Traction Control, manual HVAC,
single exhaust, 2.73 open, and an ugly-ass landau roof.
Exactly what I wanted in a DD: simple.

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#3582049 - 03/21/17 10:17 AM Re: Low/no oil pressure at start [Re: RF_Overlord]
Towncar281 Offline
n00b

Registered: 12/06/16
Posts: 13
Loc: Pasadena, CA
Ok, good to know. So far I haven't had the low oil pressure issue at startup! Hopefully the oil filter was the problem. I'll post an update in a few days. Thank you everyone for your help!

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