Question about 1999 GMC Yukon

1 Answer

The engine has a skip.i have replaced the plugs.

The engine has a skip.i have replaced the plugs. i had the engine scanned,and it showed the 3 and 5 cyls are where the miss is occuring.what is best guess, cap, rotor, plug wires or head gasket? engine is a 5.7 gm with 160K .

Posted by on

Ad

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Mentor:

    An expert who has written 3 tips or uploaded 2 video tips.

    Teacher:

    An expert who has written 2 tips or uploaded 1 video tip.

  • Expert
  • 59 Answers

It is possible that the head gasket has blown between 3&5 cylinders, a leakdown test would confirm this, remove both plugs, put air to one, if you hear it leaking out the other, this is it, it should be at or close to TDC on one of the cylinders to have all valves shut for testing. Hope this helps, I know it is never good news when someone suggests you have a major engine problem,,, that is why a thorough test is allways the best plan!

Posted on Apr 27, 2010

Ad

1 Suggested Answer

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

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

2 Answers

On my 1993 wrangler with a 2 5 if i try to start it it only fires on cylinder 1 and 3 if i shut it off and try again it fires only on 2 and 4 what would cause this


Sounds like a spark plug or distributor problem.... Change out all your spark plugs and check your wires for breaks. Check fuel injectors for build-up.

Feb 06, 2016 | 1993 Jeep Wrangler

1 Answer

2004 ford f150 5.4 3v idles rough but clears when rev engine up


Does you f 150 have electronic throttle control ? An does it have Variable Cam Timing (VCT) - if it does have Variable Cam Timing (VCT) it doesn't have an EGR valve ! What type scan tool did you use to pull the code with ? My FORD factory service information does not show that code for A 2004 F - 150 5.4 L 3 valve engine !

Aug 29, 2015 | Ford Cars & Trucks

2 Answers

No spark to distrubter


you meant no spark from distributor.? if its TO that means the ignition coil is dead. (or pcm not seeing cmp/ckp sensor signals)
PCM is the Engine injection and spark creating system EFI.
power train control module it is.
which engine of the 4?
try the correct order. this time...... and checks.... and win....
battery charged, fully to 12.6vdc rested
did you do the 60,000 mile tune up yet? if not why not?

  1. it must crank fast. if not fix that first.
  2. the spark plugs all 4 must spark, not just one.
  3. the CEL lamp must turn on key on or fuses are blown.
  4. connect scan tool,
  5. crank for 5 seconds, release key , do not turn off key yet.
  6. behold, scan tool shows why there is no spark or shows cmp/ckp ok but spark is bad (primary side) , end riddle. now.
  7. ok 6 passes muster, so is engine compression over 150psi on all 4 cylinders. sure. next
  8. we check spark at all spark plugs and use new spark plugs, and see one is oil soaked, or green antifreezes soaked or black or very odd locking tips (this is called gathering evidence, never to be skipped
  9. did you replace the timing belt if in fact you have one, CAM at the 60k service point (if not it slips and compression will be like 1/2 the normal 150psi + compression.
  10. did you do the tuneup
  11. ok all above is ok, and i do test fuel test, it runs for 3 seconds, and sounds real good, that 3 seconds, and repeats as i repeat
  12. ok that means you lost fueling or its flooding per #8 check.
  13. ill stop at fueling,,, you need a fuel pressure gauge next..
  14. btw, wide open cranking clears floods.

Mar 13, 2015 | 2006 Suzuki Forenza

1 Answer

2001 Grand Marquis engine skipping replaced spark plugs clear the problem of it started skipping again


What motor?

You would be best served & save time having
a look at the data & doing some testing with
the help of professional tools

With you in your driveway ,it will be a long trip
& you will be tempted to throw parts at it

You need to look a scan tool data & road test with
the scan tool

Then when you know about any codes that may be
stored,have oxygen sensor data,emission monitor
data,fuel trim,fuel pressure & more, you can come up
with a game plan,you won't have a game plan

You may see cylinder misfires on scan tool or have to
go about it several different ways,you can't do that

It could just be you drove around for years & believe things
were fine & the shops do what is required,not so

The proper Preventative Maintenance may be you only problem
That goes beyond spark plugs with today's technology

Jul 17, 2014 | Cars & Trucks

1 Answer

Replaced plugs , wires, distributer cap, rotor, no. 3 cyl. not hitting all the time


The problem could be related to the fuel injector instead of the ignition system.

Jan 31, 2013 | 1990 Toyota Camry

2 Answers

2008 chevy impala cyl 5 missfire 3.5 eng


sounds like the only thing left is the valve lash. If the intake gasket was bad, it would most likely cause a vacuum leak and effect the overall performance of the engine. You may also notice some oil consumption as well. Also, verify the firing order is correct.

Oct 23, 2017 | 2008 Chevrolet Impala

2 Answers

Engine seemed to skip at about 70 mph and service engine light came on. Then seemed to skip several more times at different speeds. Ran fine. Just continued to skip as we drove.


hi the engine is not skipping the problem is the engine is miss firing
that is caused by a bad .spark plug or -wires-or coil pack - when was the last time the
car had a tune up . check spark plug connections

Jun 12, 2011 | 2005 Nissan Altima

1 Answer

Hi, my toyota has started skipping on # 2 cylinder. I have replaced the wires and plugs and checked the compression and it was good. It is getting fire to the plug. When riding along it will go a few miles...


Hello you will need to have the check engine light checked with a OBD2 engine scan to retrieve the engines fault that causes this missing and do the necessary repairs.assuming and guessing it could be one of ten switches my guess is good as yours.Most garages usual charge $25.00 up to $75.00 for this scan this is the best most efficient way and most inexpensive.

Jan 01, 2011 | 1996 Toyota Tacoma

1 Answer

How to replace spark plugs. Engine seems to skip?


Best thing you can do is take it to get a scan. Both Autozone and Oreillys will do it free and you may find others to help too. Afterwards, if the scan does not show anything, you can get a gasket for the bottom of the Airhorn and remove the Airhorn and clean the groove under the gasket.

This will sometimes show a Code 401 and all you need to do is clean it. You can save yourself some work. If the scan guys think it needs plugs they will show you what you need. Remember to gap them if you do replace them.

I think this is the best thing to know whats wrong before you start taking things apart.

Nov 20, 2010 | 1995 Mercury Grand Marquis

Not finding what you are looking for?
1999 GMC Yukon Logo

102 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

76848 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers

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

Answer questions

Manuals & User Guides

Loading...