Question about 1998 GMC Yukon

1 Answer

Oil running out my tail pipe

I own a 98 Chev trk with a 350 motor.I have motor oil running out the tail pipe,could this be a valve issue?

Posted by on

  • tskkrj Feb 16, 2009

    Yes I have engine oil loss.I pulled all the plugs and the left rear plug is the only one that is oil soaked.There is also a little smoke but not to bad.Could a valve be stuck open?

  • gasitjr May 11, 2010

    Are you sure its engine oil? Is it running smooth? Is there a engine oil loss problem? Is there a coolant loss problem? Any smoke (not steam) out tail pipe?



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 90 Answers

Excess engine oil can only enter combustion chamber from four areas, (1) the intake manifold [pcv system failure], (2) Valve stem seals worn out [pluged oil return holes in heads causing oil to get sucked past worn seals] (3) Worn/varnished up/broken piston rings,(4) Highly unlikely but a hole in piston. Since you only show excess oil on left rear, suspect #2 or #3 although usually more than one set of rings will wear out or (gumm up).Check compression with all plugs out, ignition & fuel disabled, i believe 120 to 150 psi is good, if ok , check #2. If this has the older efi intake, its rare, but also could have a failed intake gasket for that cylinder and be sucking oil from underneath.Hope this helps!

Posted on Feb 17, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

Finding oil on ground by left tailpipe. Any suggestions of what could be happening and how to fix it?

Engine oil is entering the combustion chamber and exiting with the exhaust. This can be caused by worn or damaged piston rings, cylinder wall, valve, valve seats or some other internal engine issues.

Jul 31, 2016 | 2006 Chevrolet Cobalt

1 Answer

1996 4 cylinder engine jeep wrangler oil coming out tail pipe cylinders show no oil not condensation

Your pvc valve maybe clogged,backing it up and coming out of tail pipe.Here's a link on replacing your pvc valve Paul. Repair Guides Routine Maintenance And Tune up Positive Crankcase...

Oct 02, 2015 | Jeep Cars & Trucks

1 Answer

Why Motor oil accumulating in tail pipe

if its motor oil in the tailpipe then your motor is burning oil and you need to find out what is causing this. bad PCV valve, either valve seals, guides, rings or a worn out engine.

Jun 03, 2015 | Cars & Trucks

1 Answer

I have a 1998 dodge avenger it runs and starts right up but it has a raddling sound ,thick white smoke comming from my tail pipe and oil all over my motor what does it sound like ? A blown head gasket ,...

White smoke from the tail pipe is caused by moisture in the engine being burned off. Some is normal on a cold engine but the rattle and amount of smoke you describe are a sure sign of a blown head gasket allowing coolant to enter the cylinders.

Oct 09, 2010 | 1998 Dodge Avenger

1 Answer

Using alot of oil and antifreeze. no puddles,not coming from tail pipe where is it all?

Burning oil is a burned or stuck valve or bad rings. Loss of Anti freeze is over heating or a bad head gasket or major problem with the engine. The fluids have to be going somewhere. I have had conditions where the leak only occurred when the engine was running and was very hard to find. Rear Main seal issue. You need to have the motor checked out by a mechanic.

Nov 17, 2009 | 1992 Ford Explorer

2 Answers

Blue smoke from tail pipe 98 neon no leaks i can see

It sounds like you could need some new piston rings. when they go bad it causes oil to get by into the combustion chamber and burn when the engine fires.

Apr 20, 2009 | 1997 Dodge Neon

1 Answer

98 chev 5.7 #3and#6 clys are missing at ilde to about 2500 rpm

I would test for a leaking intake manifold gasket. WITH A WATER SPRAYER , and the engine running at operating temps and at idle, spray some water where the intake meets the cylinder head. If you hear a little SUCKING SOUND, and the engine smooths out temporarily, thats it Hope this helps

Apr 12, 2009 | 1998 Chevrolet K2500

2 Answers

1993 TOYOTA TERCEL 1500cc Valve Seals Replaced now smokes much worse

You either have had the wrong valve seals installed, they are physically missing, or the valves are incorrect (too loose in the guides/stem too thin). The rocker arm seals will not contribute to your issue. If it did not have the oil smoke before you took the head off, the issue is with whatever the machine shop did. Valve seals have to fit TIGHT, or oil will go down the valve stem into the intake.
Take the head back to the machine shop & tell them to fix it. For free.

Aug 23, 2008 | 1993 Toyota Tercel

1 Answer

Valve clearance 350 chev '72-'80

Dear Customer,

your car Chev 350 need this configuration for
Valve clearanceis Chev 350 Carb 69-80 63.48 169.99 60.29

try something new & get mroe performance on your dream.


May 17, 2008 | 1983 Chevrolet Impala

Not finding what you are looking for?
1998 GMC Yukon Logo

Related Topics:

305 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts


Level 3 Expert

77201 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22265 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides