Low Oil Pressure and Coolant Temperature Messages On

831 Views 5 Replies 5 Participants Last post by arctic_man, Apr 7, 2015

dleefayetteville

Discussion Starter · Apr 6, 2015 (Edited by Moderator)

Guys, I've got basically a similar problem. I've got a 96 Concours and this weekend my oil pressure light flickered for a while, came on steady, went back out, then started doing it all over again. Then, the "Low Oil Pressure" and "Coolant Temperature" messages came across my tale-tell. I had that Harmonic Balancer bolt adjusted last year at the Caddy shop but when the car is running, it looks to me like the pulley is wobbling slightly. Could my problem be that I need a new pulley and bearings? If anyone's got any ideas, please let me know.

Guys, I've got a problem with my 96 Concours. Last week, my oil pressure indicator flickered on, then came on steady, went back out, then started doing the same thing all over again. This week, I started getting "Low Oil Pressure" and "Coolant Temperature" warning messages across my tale-tell. Last year, I had that Harmonic Balancer bolt adjusted at the local Caddy shop but whenever the car is running, it looks to me like the pulley is wobbling some. Could my problem be that I need a new pulley and bearings or should I really start worrying? Any help would be appreciated.

Identical threads from Seville and Northstar have been merged.

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Ranger

· #2 · Apr 6, 2015

Re: Northstar Low Oil Pressure Fix

There are no bearings involved with the pulley. It is attached directly to the crankshaft snout.
A slight wobble should have no effect on oil pressure.

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Submariner409

· #3 · Apr 6, 2015

The crank pulley has no "bearings" - it's a loose press fit to the crank snout, retained with tremendous crank bolt force - that force clamps the oil pump drive sleeve between the pulley face and machined crank face. There is a specific torque + degrees of tightness procedure for that. If the grooved pulley itself is wobbling, then the elastomer coupling between the pulley and center hub is failing and the assembly requires replacement.

The oil pressure switch is known to fail, causing your oil light and warnings at idle.

That ^^ has nothing to do with coolant messages. Cooling systems require diagnosis and repair just as any other system warnings.

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97EldoCoupe

· #4 · Apr 6, 2015

What is the build date on your Deville?

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dleefayetteville

Discussion Starter · #5 · Apr 6, 2015

Thanks for the info guys. To answer your question 97EldoCoupe, I believe the build date is June of 1995.

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arctic_man

· #6 · Apr 7, 2015

To add to Sub's comment, my oil pressure switch failed and did the exact same thing. Light would flicker, especially at stops. I could rev the engine and it would go away. But with as long as I have been on these forums and working on my cars, I can't say I have ever seen a post where someone had the pump fail. Other members who have been here longer can probably attest to that too.

Hopefully that makes you feel a bit better.

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