Question about 2002 Oldsmobile Aurora

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I'm getting a pretty substantial amount of oil that continually accumulates on the top of the northstar v8 and pools on the top of the engine. From what I can tell, the oil is being drawn into the air intake manifold via the PCV tubes. This vehicle doesn't have a PCV valve on the valve covers. When I pulled the PCV tube, there was a significant amount of vacuum through the rear bank tube; more than I would have expected. Any idea why there would be oil pooling in the intake manifold and how would one go about preventing oil from being drawn into the manifold; only the crankcase gasses?

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  • Oldsmobile Master
  • 12,433 Answers

Leaking valve cover gasket ? upper intake manifold leaking

Posted on Apr 18, 2017

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6ya6ya
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Posted on Jan 02, 2017

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ewashmidas
  • 362 Answers

SOURCE: PO171 error code System too lean bank 1

Here are some possible causes, I would start with anything related to replacing the intake.

Air leaks in intake manifold, exhaust pipes or exhaust manifold
Fuel control sensor is out of calibration
Low fuel pressure (fuel filter clogged, pressure regulator failure)
One or more injectors restricted or pressure regulator has failed
O2 sensors contaminated, deteriorated or has failed
Vacuum hose is disconnected, broken, leaking or loose

Posted on Jan 28, 2009

ourhowse
  • 2007 Answers

SOURCE: 1991 Oldsmobile Cutlass Ciera idles high

Change your idle control sensor, but first make sure your throttle linkage isn't sticking.

Posted on Jun 03, 2009

  • 85 Answers

SOURCE: 1997 volvo850gtl extreme smoking from exhaust

black smoke ( burning too much gas)
blue smoke (burning oil)
white smoke ( burning coolant)
hope this helps

Posted on Jun 24, 2009

  • 18 Answers

SOURCE: 3.4L oil leak problem in the center of the engine under the Intak

If you have already replaced the stub shaft O-Ring you may have head gasket issues.

Posted on Aug 07, 2009

honeymokey
  • 3113 Answers

SOURCE: Oldsmobile Delta 88, Idles High on Cold start with DTCs

Sounds like a vacumn leak. Gasket under intake plenum may be leaking. Be sure the pcv valve has the o-ring around it in the correct place also as it will set a code.

Posted on Mar 11, 2010

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How do you get the air out of a coolant system in a 2007 Buick Lucerne ?


In 2007 the Buick Lucerne was equipped with 2 engine options. 3.8 Liter OHV V6 and the Northstar 4.6 Liter V8.

Was the cooling system recently opened? What was serviced?

The 3.8 has a 7mm bleeder screw on the top of the thermostat housing. A funnel in the radiator is helpful to bleed the air. You will notice the upper radiator hose curves to a higher elevation than the bleeder screw. Manipulation of the hose by hand may be needed to get the air out. I recommend and use a cooling system funnel to help. It minimizes mess as well. ( https://smile.amazon.com/Lisle-24680-Spill-Free-Funnel/dp/B00A6AS6LY/ref=sr_1_1?ie=UTF8&qid=1488855489&sr=8-1&keywords=lisle+cooling+system+funnel ) There are other brands available as well.

I do not recall if the Northstar V8 has a bleeder on all models, but some do have a similar bleeder screw. Be sure the system is filled initially and manipulate the hoses up and down as well as squeeze them to get air moving. The Northstar water pump is on the back side of the engine driven by the camshaft. The upper hose runs along the front of the engine bay and connects to the radiator at the top on the passenger side of the engine bay.

For both vehicles, fill as much as possible cold. Start and idle. As the temperature increases, I recommend occasionally revving the engine to between 1500 and 2000 RPM to fill heater core and move coolant with a little more force.

Mar 07, 2017 | 2007 Buick Lucerne

1 Answer

2000 coop divill oil leek rear crank has this been a problum for gm?


If you have the Northstar V8 engine, yes.
You can do an internet search for Northstar oil leak recall or service bulletin and read all about it.

Jul 26, 2012 | Cadillac DeVille Cars & Trucks

2 Answers

I find the the oil keeps running low before the engine oil life will het 0% sometimes it's not at 30% and the oil is almost completely gone. Is there a know problem with the sts burning up oil or leaking...


the northstar engines burn incredible amounts of oil....your owners manual will explain.....'oil consumption'....but the reality is keep checking it...the 'idiot light comes on...or info center...low oil when it is 2 quarts down....another of GM follies...i have a northstar Caddy too.....

Mar 31, 2011 | 2006 Cadillac STS

2 Answers

Are the Northstar V8 Engines notorius for breaking down? I have a 2004 Cad SRX and the deal is trying to make us take the extended warranty and we are not sure if we need to.


The northstar engine is great until it blowns a head gasket and starts leaking oil and water. If you have one you should start a class action lawsuit, because they have had enormous numbers of problems with that engine. Most problems start about 90k miles. I am amazed that Cadillac can get away with it (they are still producing the northstar engine).

Mar 29, 2011 | 2004 Cadillac SRX

1 Answer

How to do an oilpan on a 88 chevy montecarlo


  1. Disconnect battery negative cable.
  2. Remove air cleaner.
  3. Remove upper fail shroud (V8)
  4. Raise vehicle and drain oil pan.
  5. Disconnect A.I.R. hose at converter pipe (V8)
  6. Disconnect A.I.R. pipe at exhaust manifold (V8)
  7. Remove exhaust crossover pipe at manifold and converter.
  8. Remove starter.
  9. Remove flywheel cover.
  10. Disconnect transmission oil cooler lines at oil pan.
  11. Remove engine mount 'through' bolts on V8. Loosen right bolt and remove left on V6.
  12. Remove oil pan bolts and lower oil pan. Check that forward crankshaft throw and/or counter balance weight are not extending downward so to block oil pan removal. Turn crankshaft, necessary, to put throw on horizontal plane.
  13. Raise engine.
  14. Remove oil pan.
Installation


  1. Clean sealing surfaces on cylinder case and pan.
  2. Check oil pan gasket for damage; replace if necessary.
  3. Apply a small amount of 1052751 or equivalent to front and rear corners of oil pan.
NOTICE: Only a small amount of sealant is required. Excessive amounts of sealant may cause a problem with proper sealing of oil pan.


  1. Install retaining bolts and torque to 9 N.m (80 lb. in.).
  2. Raise engine, if necessary.
  3. Lower engine, install mount 'through' bolts and torque to 50 lb. ft. (65 N.m).
  4. Install torque converter cover.
  5. Install starter.
  6. Install exhaust crossover pipe at manifold and converter.
  7. Lower vehicle.
  8. Install fan shroud.
  9. Install air cleaner.
  10. Fill crankcase with oil.
  11. Connect battery negative cable, start engine and check for leaks.

Nov 30, 2010 | 1987 Chevrolet Monte Carlo

1 Answer

Can I use 15w 40 oil in my car it has the northstar v8 motor?


not recommened , at start it will take too long for the oil to be pumped up to the upper parts of the engine increasing wear, even if it reads good pressure you will not get the flow needed to certain parts of the engine

Aug 23, 2010 | 2005 Pontiac Bonneville

1 Answer

1997 cadillac deville engine is overheating. can your ''thermagasket kit'', be used on 4.6L northstar 32 valve V8 engine. If so, approximately how long will the treatment last and how much does it cost?


When you say thermagasket kit,I assume you mean one of those silly DIY gasket sealant liquids that you put in the engine.

You should not use these type of products on ANY engine let alone the Northstar.

To cure a headgasket leak, replace the headgasket.....there is no miracle cure.

On the Northstar, you will damage the cooling system,plus you will continue to have issues as time goes on.

How do you know you have a blown head gasket?

Here is something to consider.......

The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.

May 31, 2010 | 1997 Cadillac DeVille

3 Answers

Need the firing order for a 2004 Cadillac v8 northstar


This should be the firing order;
2004 Northstar RWD/AWD 4.6L V8 (LH2) ... Firing Order: 1-2-7-3-4-5-6-8
Please be sure that when you list your questions on auto's be more precise on info provided. Sometimes listing the Vin Engine number helps to to locate info. Good Luck!

Aug 28, 2009 | 2004 Cadillac Deville

1 Answer

95 cadillac engine


Right out the top or you can drop the frame with the motor and trans

Jun 30, 2009 | 1994 Cadillac DeVille

2 Answers

TO REPLACE THE STARTER, DO YOU START AT THE TOP OF MOTOR OR IS IT LOCATED BELOW?


Northstar starters are indeed on TOP of the engine, directly below the intake manifold, which is under the pretty Northstar logo'd plastic cover.

Jun 24, 2009 | 2002 Cadillac Deville

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