Last post on Dec 04, 2013 at 9:10 AM
You are in the GMC Yukon
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GMC Yukon, GMC Yukon Denali, GMC Yukon XL, SUV
#126 of 157 idle/not running
Feb 29, 2012 (11:46 pm)
2000 GMC Yukon XL 2500 6.0 Feel like we have tried everything! It was idling rough at first then twice it died at an intersection, having to get it towed home. We have replaced maf sensor, throttle positioning sensor, fuel pressure regulator. We can hear the fuel pumps humm, though this can still be the issue???? We have spent so much money and time on this vehicle and any advice would be appreciated! Right now the truck wont even crank over...
#127 of 157 Re: 2003 GMC Denali same electrical problems [lmaes1]
Mar 03, 2012 (4:56 pm)
A relay is stuck in the energized position somewhere - air conditioning is where I would try first. This leaves the compressor clutch engaged, even while the truck is off and drains the battery.
#128 of 157 Re: idle/not running [case7997]
Mar 03, 2012 (5:14 pm)
These vehicles have a one-piece fuel pump/sending unit which can be taken apart. When the fuel gets below the level of the fuel pump(below 1/4 tank), there is a tiny plastic hose in the fuel pump unit that fills the unit up so the pump doesn't suck air. The hose, or brass strainer at the end of the hose, can come apart and keep it from filling the unit. The car may stall, stumble on acceleration, and even backfire. It can drive you crazy. Acts like a timing/ignition problem or a vacuum leak at the intake manifold, or even water in the fuel. When checking fuel pressure at idle, the pressure will be just right, but when cornering, stopping, or accelerating from a stand still, the fuel in the tank will slosh away from the pump, and the level in the pump housing drops, causing the pump to suck air. The only way to even check this is to drop the fuel tank and take the sending unit apart. If the brass strainer unit comes out of the plastic housing, get a new unit. On the old GM trucks, the fuel pump had a short rubber hose on it that would eventually split. Under a load, the fuel would pump right back into the tank instead of going to the injectors. The solution is a 25 cent piece of fuel hose placed between the pump and the unit housing. To see it in action, you'd have to remove the fuel pump and energize it in a 5 gallon bucket of fuel (very dangerous). Best of luck.
#129 of 157 Re: Help me I need my Truck to start [mister40]
Mar 03, 2012 (5:25 pm)
Have the crankshaft position sensor checked, and if the vehicle has a distributor, there is a camshaft position sensor in the distributor that checks a reference signal for the crank to ensure proper firing order.
#130 of 157 Re: 1996 GMC Yukon 5.7L [mikelong]
Mar 08, 2012 (2:15 am)
I have an 01 GMC Yukon that had starting problems... if you wait﻿ 10 minutes intervals and try again it stats like nothing happened (one time it took 40 minutes). I have tried "all the tricks" and so far since I replaced the ignition switch electronics ($200 part and 20minutes to install myself) I have not had the problem. I will get the p/n and post it when I get home.
#133 of 157 intermittent no start
Apr 13, 2012 (6:02 am)
2002 Yukon, 141,000 miles, well maintained. Is recently experiencing an intermittent problem (about 50% of the time). Symptoms: turn off ignition and stereo speakers give an audible pop. The power to windows and stereo is immediately cut off when this happens – the vehicle is supposed to continue supplying power for a short period of time or until the door opens. The stereo also loses power to the point that the clock and station settings are wiped out. Lastly, the vehicle is not starting properly. On turning the ignition, the engine will turn over, but not run. Holding the ignition for several seconds will not start the engine, however cycling the ignition several times (usually 3rd or 4th) will start the vehicle. Again, the problem is recent and intermittent.
#134 of 157 2001 starts but won't stay running
Apr 28, 2012 (8:22 am)
I originally posted this in the wrong place I think
We were driving down the interstate last night and the truck seemed to jerk a little like it was out of gas (had over a half a tank) then died. pulled over to the side of the road tried to start it a couple times with no luck. Put the Hazards on and in less than 25 minutes the battery was completely dead. We had it towed to the town we were going.......woke up this morning jump started the truck, it started, then died. HELP! Heres to hoping this is an easy fix.....need to get home.
#135 of 157 Re: intermittent no start [marvinyukon]
May 15, 2012 (5:50 am)
my yukon is the same year as your i was having the same thing with my i took it to bill hood gmc it turn out to be a bad wire it cost about 250