Question about 1999 GMC Yukon Denali

1 Answer

I have a 99 gmc yukon denali. it has a multiple cylinder misfire, uses coolant, no visible leaks. and my spark plugs look black. i have gave it a full tune up. (plugs,wires,cap,rotor,and coil.) i am thinking my problem was head gaskets or intake gaskets. i have also replaced the upper intake. what is wrong with my motor?

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

  • Expert
  • 92 Answers

Very common the intake manifold gaskets leaking. I've replace tons of them. They can **** air internally and cause a misfire.

Posted on Dec 31, 2010

2 Suggested Answers

6ya6ya
  • 2 Answers

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

Hi,
a 6ya expert 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 repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

  • 92 Answers

SOURCE: i have a 99 gmc yukon denali. it has a multiple

Intake manifold gaskets leaking internally.

Posted on Dec 31, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Oil filter engine 6 0


Go to another spare parts shop and check out their catalogues. Check the numbers on your existing filters and plugs.;

Sep 22, 2013 | 1999 GMC Yukon Denali

1 Answer

2002 GMC Yukon XL Denali 6.0 Vtec Was have brake problems and ABS light on so replaced Huds and all rotors and pads then i was on the freeway when the serves Engine soon light came on so I got to my exit...


P0300 indicates a random or multiple cylinder misfire. With the engine running rough unplug one coil at a time while listening for an RPM change or for the engine to run even worse. If there is no change from one or more coils than check those coils for spark. If there is no spark out one of the coils swap it with another coil. if there is still no spark replace the coil.

Sep 05, 2013 | 2002 GMC Yukon Denali

1 Answer

What dose code P0300 mean on a 99 Yukon


P0300 is indicating a random/multiple cylinder misfire.
The following are possible causes for this problem: (courtesy of obd-codes.com)
  • Faulty spark plugs or wires
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector(s)
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computer

Apr 03, 2012 | 1999 GMC Yukon

2 Answers

I have gotten a P0306 Cylinder 6 Misfire Code on a 2000 GMC Yukon Denali. I have replaced lower intake gasket, spark plugs, spark plug wires, distributor cap and rotor.


This is AFTER the intake repair? or did you do this to try to fix the misfire????First you will need to check Injector Flow to the #6 cylinder. A TECH2 scanner is required, Most likely the injector may need to be unclogged with high pressure air or nitrogen.

Nov 16, 2010 | 2000 GMC Yukon Denali

1 Answer

Diagnostic trouble code P0303 for 2002 gmc yukon


Misfire cylinder number 3. Have you tried replacing plugs and wires or switching plugs, wires or coils between cylinders?

Apr 10, 2010 | 2002 GMC Yukon Denali

2 Answers

PO300 Multiple Cylinder Misfire Detected on GMC 5.3L Yukon


TRY LUCAS OIL,I USED A FULL LITRE FIRST,WILL LET YOU KNOW HOW IT WORKED.BEFORE THIS I CHANGED OUT TWO ROTTEN LOOKING KNOCK SENSORS,THEN TWO WEEKS LATER REPLACED THE REAR ONE AGAIN,AND IT FAILED AGAIN.AND SO I AM NOW TRYING THIS NOTICED A BIG DIFFERENCE IN POWER NOISES,NO PINGING,NO RATTELING LIKE IT IS A DISEL.

Apr 09, 2010 | 2001 GMC Yukon XL

1 Answer

Check engine light 2004 GMC Yukon


When my check engine light went on, it was a oxygen sensor

Jan 13, 2009 | 2001 GMC Yukon Denali

2 Answers

2004 GMC Yunkon Denali is misfiring


it could be alot of things...you could start by routine maintnence( new spark plugs, spark plug wires, air filter, oil change, the in line fuel filter) also take into consideration what kind of gas you are using...i know it sucks spending $100 a week in gas with your AWD 6.0 liter V-8...but if ur not running premium it could very well be your problem. I have also heard of the denali's having oxygen sensor issues...is it throwing a check engine code?

Dec 12, 2008 | 2003 GMC Yukon Denali

Not finding what you are looking for?
Cars & Trucks Logo

369 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

75822 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

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

Answer questions

Manuals & User Guides

Loading...