Question about 2003 GMC Yukon XL

1 Answer

Have a 2003 Gmc Yukon Xl 2500 6.0. When you first start it, the idle is low then high repeatedly. When you take off it sputters and will be ok until its warmed up. We have replaced the battery, spark plugs and wires. This summer really didnt knotice this problem again, but colder temps in the morning the issue is back. The fuel pump went out about 2 years ago. We never let the gas get below 1/4 tank. One time a mechanic said the mass air flow sens was dirty, we cleaned it, reset the code and seemed ok for a few days. Anyone have the same issues?? Thanks

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 364 Answers

I suspect the idle solonoid and/or the automatic choke Idle somonoid plays havoc when cold and you have to keep playing with the revs to keep it running. Even though you had cleaned the mas airflow sensor it still may be faulty. I would take it to Orielys or Autozone and ask them to read the codes for you {no charge} this will eliminate the guess work, good luck

Posted on Oct 21, 2013

Ad

6 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.
New users get to try the service completely Free afterwhich it costs $6 per call 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

SOURCE: 1999 GMC Suburban 2500. 454 engine

sounds like fuel pump pressure. I had the same thing happen to me in a Lincoln mark VII and the electrical connection was shorting out in the fuel pump. I changed the fuel pump..Returned under warranty) put the new one on with filter and had no problem with it.

Posted on Oct 10, 2008

  • 114 Answers

SOURCE: 2002 gmc yukon, rich fuel code, low fuel pressure @40

you may have two oxugen sensors on your yukon. if so the oxygen sensor that controls that bank may be bad. from what you mentioned in your complaint, it sounds like it is the oxygen sensor.

Posted on Dec 24, 2008

  • 1 Answer

SOURCE: 2002 GMC Yukon, erratic idle(hi-low) when cold. 125K miles.

i now for a fact that it is the egr valve . carbon balls in side you have to take it of and clean them out

Posted on Apr 18, 2009

  • 43 Answers

SOURCE: 2003 gmc yukon denali xl starts but gas not

if your engine starts up and dies right away the you probably have a fuel pump problem and the service ride control mean that your air ride compressor has gone bad just turn your key to the on position and wait about 30 seconds you will here buzzing from the left rear wheel area if the compressor is working

Posted on Jul 19, 2009

jturcotte
  • 8512 Answers

SOURCE: Hi I have a 98 gmc sierra 1500 with 5.7 vortec,

It's hard to find these small leaks. If you have a vacuum pump, there are a few tests you can run on the components of the system. See below.


TESTING

Vapor Canister
See Figure 1

  1. Apply a length of hose to the lower tube of the purge valve assembly and attempt to blow air through it. There should be little or no air should passing into the canister.

If the canister is equipped with a constant purge hole, a small amount of air will pass into the canister.
  1. Using a hand-held vacuum pump, apply a vacuum of 15 in. Hg (51 kPa) to the control vacuum (upper) tube. If the vacuum does not hold for at least 20 seconds, the diaphragm is leaking. Replace the canister.
  2. If the diaphragm holds vacuum, attempt to blow air through the hose connected to the PCV tube while vacuum is still being applied. An increase of air should be observed. If no increase is noted, the canister must be replaced.
jturcotte_228.gif

Fig. Fig. 1: Cross-section of the vapor canister


Fuel Tank Pressure Control Valve

  1. Attach a length of hose to the tank side of the valve assembly and try to blow air through it. Little or no air should pass into the canister.
  2. Using a hand-held vacuum pump, apply vacuum equivalent to 15 in. Hg (51 kPa) to the control vacuum tube. If the diaphragm does not hold vacuum, the diaphragm is leaking. Replace the valve.
  3. If the diaphragm holds vacuum, attempt to blow air through the hose connected to the valve while vacuum is still being applied. Air should pass. If no air is noted, the valve must be replaced.

Thermostatic Vacuum Switch
  1. With engine temperature below 100°F (38°C), apply vacuum to the manifold side of the switch. The switch should hold vacuum.
  2. Start and continue to run the engine until the engine temperature increases above 122°F (50°C). The vacuum should drop off.
  3. Replace the switch if it fails either test.

purge valve location:

jturcotte_229.gif


EVAP vacuum switch pic:

jturcotte_230.gif

EVAP system diagram:
jturcotte_231.gif

Posted on Nov 20, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

2003 yukon XL one headlight is not getting power, how do i troubleshoot?


If low and high beam both are failing to work check the ground for that side . If high or low one works and the other does not check the fuse for that beam as it has 4 fuses one for each side and low and high. The fuses are in the underhood fuse block . Marked as LO HDLP LT, HI HDLP LT, LO HDLP RT and HI HDLP RT . They are 10 amp fuses .

Feb 04, 2016 | 2003 GMC Yukon XL

1 Answer

Yukon Squeek


Have you checked the brake pads they have a squeaker on them to tell you when the pads are worn down.

Jun 10, 2017 | 2003 GMC Yukon XL

1 Answer

Yukon stalls at stop signs or when turning at low rpm's. Acts like idle is to low.


clen the idle air control vale and passage with air intake cleaner

Jan 10, 2011 | 2003 GMC Yukon XL

2 Answers

GMC YUKON XL 2WD 5.3ENGINE DIES LOW IDLE


Problem my be your throttle sensor.

Mar 18, 2010 | 2001 GMC Yukon XL

1 Answer

04 gmc yukon heater air cold passanger side.


If this happens when you are idle, and then you get hot air as you drive, most likely you have low coolant and it only cycles as you drive. Get approved dextrom gmc coolat and cap off your coolant it is most likely low.

Jan 17, 2010 | 2003 GMC Yukon XL

2 Answers

2003 yukon stalls in traffic


sounds like a spark timing issue. dist/coils or plugs. the only other thing and this is weird-the coolant temp sensor

Oct 08, 2009 | 2003 GMC Yukon XL

1 Answer

2001 Gmc yukon xl a/c blowing hot most of the time but some times blows cool for a little while. pressure gage shows 100+ when I am told this should be between 25-65. The compressor does not seem to be...


the earlier GM trucks had a problem with the a/c systems
Compressors are junk, but this will usually break the a/c belt, and make a horrible noise right before that.
the pressure you have listed is not much help, there is a high and low side pressure. If they are both the same, then the compressor is not on or is not pumping (broke). The early yukons/suburbans/tahoes also had a problem with the a/c cycling switch. If yours has a brown band, replace it.

At Idle (depending on outside temp) Low pressure should be about 40 psi at idle and high side about 220....again this can change greatly by outside temp.
Another thing you may want to look at is of course a leak in the system, make sure its fully charged, and check the fan clutch.

Jul 13, 2009 | 2003 GMC Yukon XL

1 Answer

Went to put the 2001 yukon xl 2500 into 4x4 and service 4wd came on and all lights went off on switch. I checked fuses and power to switch all was ok. could switch be shot


I had an 2001 or 2003 envoy that did that and the only solution was to disconnect the battery for about 5 minutes so the computer would reset.

Dec 06, 2008 | 2006 GMC Yukon Xl Denali

Not finding what you are looking for?
2003 GMC Yukon XL Logo

94 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

76630 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

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

Answer questions

Manuals & User Guides

Loading...