Question about 2000 Cadillac Seville

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Lower crankcase seal leaks slightly on 2000 sts northstar engine with 83000 miles. Any options other than pulling the engine to replace this seal?

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Posted on Jan 02, 2017

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Setting the camshaft timing isnecessary whenever the camshaft drive system has been disturbed,meaning the relationship between any chain and sprocket has been lost.Correct timing exists when the crankshaft and intermediate shaftsprocket timing marks are in alignment and all 4 camshaft drive pinsare perpendicular (90 degrees) to the cylinder head surface.

degrees) to the cylinder head surface. 0900c152800a57af.jpg I hope this helps, if not let me know

Posted on Nov 12, 2008

  • 65 Answers

SOURCE: window wont auto lower or rise to open door

my guess is the door lock mechanism is faulty.if the window control unit does not see a signal for the door being opened it will not raise or lower the window...does the interior light opperate when the door is opened???.if not you can put money on it being the mechanism.

Posted on Feb 10, 2009

  • 778 Answers

SOURCE: 1998 Seville SLS 4.6 Northstar temperature gauge

Sounds like your thermostat may be stuck open. You will be able to look at it and tell upon removal.

Posted on Feb 17, 2009

  • 1 Answer

SOURCE: I have a tapping noise in my 2000 northstar engine ? Any suggesti

i have 56,000 miles and have the same thing....The dealer has told me it is normal on that motor many times.

Posted on Apr 28, 2009

  • 187 Answers


This is a good diagnoses. When cooled get down and grab the exhaust pipe in the area you think the noise is coming from and give it a shake. You may find that all that is needed is a slight adjusting of one of the hangers. Good luck

Posted on May 07, 2009

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2 Answers

2008 Cadillac STS with 4.6l V8 Northstar engine. Do I need to add the anti-leak tablets to the new coolant or is this newer model engine exempt from that requirement?

You have some protection for the aluminum components with new coolant but for all engines with aluminum pieces,the tablets are cheap insurance and recommended to prevent/reduce electrolysis which results in leaks.
Use them.

Jul 09, 2017 | Cadillac Cars & Trucks

1 Answer

My 2008 chevy avalanche is burning 1 quart of oil every 1000 miles

How many miles on your vehicle ? Do you see any leak spots on the ground from the truck ? Blue exhaust , oil burning , valve guide seals , piston rings , PCV clogged .

Oil Consumption Diagnosis
Excessive oil consumption, not due to leaks, is the use of 1 L (1 qt) or more of engine oil within 3 200 kilometers (2,000 miles).
The causes of excessive oil consumption may include the following conditions:
• External oil leaks
Refer to Oil Leak Diagnosis .
• Incorrect oil level or improper reading of the oil level indicator
With the vehicle on a level surface, run the engine for a few minutes, allow adequate drain down time, 2-3 minutes, and measure for the correct engine oil level.
• Improper oil viscosity
Refer to the vehicle owners manual and use the recommended SAE grade and viscosity for the prevailing temperatures.
• Continuous high speed driving and/or severe usage
• Crankcase ventilation system restrictions or malfunctioning components
Refer to Crankcase Ventilation System Inspection/Diagnosis .
• Worn valve guides and/or valve stems
• Worn or improperly installed valve stem oil seals
Refer to Spark Plug Inspection .
• Piston rings broken, worn, or not seated properly
Allow adequate time for the rings to seat.
Replace worn piston rings, as necessary.
Refer to Cylinder Leakage Test .
• Piston and rings improperly installed or not fitted to the cylinder bore
Refer to Lower Engine Noise, Regardless of Engine Speed

Jun 14, 2014 | 2008 Chevrolet Avalanche

1 Answer

Can a blocked pcv cause a oil leak

The upper part of your engine is like a compressor. The lower part is similar, but not to the same degree because there is a lot of room in the lower part of the engine which keep the pressures much lower. Yes, a blocked PCV valve can cause excessive crankcase pressures to build up which can cause oil to leak out of oil seals which are worn and weak. In some cases it can even cause oil leaks on low mileage engines which have no means of venting the crank case pressures. I hope this has helped you. Usually I don't run into too many stopped up PCV valves, just restricted ones and ones which won't close when they are suppose to.Good luck

Apr 27, 2014 | 2001 Nissan Pathfinder

3 Answers

Oil leak between oil pan and transmission.

Try running some of that high-mileage engine oil next time you do an oil change (it helps to swell engine seals slightly). If the problem clears up or is reduced, then it's likely that the rear main oil seal is starting to leak a little. The rubber seals will harden up and shrink a little with age.
I would also powerwash the entire area clean, so that way any leak will be easier to monitor and pinpoint.

Feb 24, 2013 | 1999 Chevrolet Silverado 1500

1 Answer

Is there a product made that will stop oil leaks I'n northstar engines


Gunk M2112 Engine Oil Stop Leak OR

Gold Eagle Engine Stop Leak Safely stops engine oil leaks. Compatible with all engine oils. Prevents costly IF none of these products work I would recommend cleaning off the lower half of your engine with some brakleen and checking to see how quickly it leaks. Most crankcase leaks do not leak as much as they seep. If it is seeping or has a slow leak you can clean the crankcase at oil change and you will probably not have any oil dripping from the underside of your car. If that is the case that small of a leak in my opinion doesn't warrant resealing the crankcase. If you do have a major leak and need to reseal the crankcase, you do not need to remove the engine. You do however have to remove the transmission and the cradle and hang the motor with a fixture. When resealing the crankcase, for best results use factory gasket sets and make sure all surfaces are very clean and and do not have any nicks or scratches. also use an anaerobic sealer in addition to the rubber gaskets, and make sure to properly torque all fasteners. As for everyones oil consumption complaints all Northstars will burn some oil. GM says up to 1 quart per thousand miles is acceptable. If you are using multiple quarts between oil changes you may consider performing or having the dealership perform a top engine clean. This will loosen the carbon from the top end of the motor and help free up sticking piston rings. The Northstar motor runs hot and has a tendency to pruduce a lot of carbon. In addition to this using an in tank injector cleaner will help the motor stay cleaner and burn less oil. Another common carbon problem will be in your throttle body. If you feel the accelerator pedal beginning to stick you should check the throttle plate and throttle bore for sticky carbon build up. It is easily cleaned out with some carb cleaner and a tooth brush. Hope that helps. Good luck,

Nov 02, 2011 | 1994 Cadillac Eldorado

1 Answer

I have a 1994 cadillac seville sts that is leakin quit a bit of oil...we thought it was a rear main seal but after taking it apart found out that's not the case.... it has a northstar engine in it

the northstar engines are notorious for rear intake manifold leaks, leaks down rear of engine and looks like rear main seal. Also check oil pressure switch for cracks

Feb 17, 2011 | 1994 Cadillac DeVille

2 Answers

2000 buick lesabre has 64000 miles and uses a quart of oil in 3000 miles. Want to know what would cause this.

According to GM 1 quart per 1,500 miles is an acceptable oil consumption tolerance. 1 quart in 3k isn't bad.

I've had several gm 3.1 and 3.4 liters that have had there oil consumption issues remedied after the lower intake gaskets where replaced due to coolant leaking.

There are a couple of common problems that can cause oil consumption. Valve seals, bad rings, and PCV valves.

Valves seals would require a valve job which would requirethe removal of the heads. Rings would require a motor rebuild. Both of these are expensive options and oil is still pretty cheap.

Replacing the PCV valve might help. On the 3.8 it will be under the MAP sensor on the passenger side of the intake plenum.

As for as the intake gaskets, its a possibility but I don't have any hard evidence this could be the problem on a 3.8. Eventually the gaskets will start to leak oil. If you decide to replace them at that point I guess you will find out. I wouldn't do it on a hunch, its not a cheap repair.

Oct 07, 2010 | 2000 Buick LeSabre

1 Answer

Have an oil change every 3000 miles by about 2000 miles it is allready a quart to 2 low and there is no visable oil leak

What you describe is normal for the Northstar engine, they do tend to burn oil.
It sounds a lot but by contrast, consider that BMW recommends checking the oil level every time you fill up at the gas station on some of their models (M3,M5 etc).

Aug 29, 2010 | 2001 Cadillac Sts

1 Answer

Rear engine oil leak....

Oil leak can be attributed to several factors.
1. Gasket failure.
2. Uncontrolled Crank case pressure Failure.

Tighten both the valve cover and oil pan bolts.
Replace the Positive Crankcase Ventilation Valve and vacuum line.,

This is a valve causes a negative vacuum on the engine while its running, As to say if it had a leak in a valve cover it should not be leaking while its running, only when the engine it turned off.

Hope this tip guides you in the correct direction to solve this problem.


Mar 05, 2010 | 2001 Nissan Frontier Crew Cab

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