1999 GMC Yukon QuestionsRefine by vehicle
Have 99 Yukon 2wd 5.7 135,000 since new and most of time engine will not slow until I apply brakes. Idles correct, no service light or code. Years ago dealership replaced TPS and worked a couple days and returned. This also can happen if I pull say the MAF or other sensor wire, run then reconnect, it may decelerate properly for a day then back again. It comes and goes on its own. In a parking lot, engine will run 1500 or more RPM until I apply brakes then it idles properly. Will decelerate all the time by putting in a lower gear with higher RPMS - like vacuum has some affect. Driving it will take 3 blocks in D3 to slow from 40 MPH to maybe 30. Will decelerate when driving, if I shift to neutral and back to drive. Also has a 3 second lag period from releasing throttle to engine slowing.(maybe normal?)Thinking MAF or MAP?
Have 238,000 miles on my Yukon. Have been told 300,000 miles is nothing for this vehicle. Wondering what it would cost to put a new enngine in it rather than buying another vehicle!
My yukon is getting a code that says random multiple misfire how do you fix this? I had the spark plugs changed,replaced the distributor and then replaced the fuel pump and now it is getting the random code but it was not showing the code prior to the tune up it was however driving rough and stalling
what are the signs of rear end replacement
started rough idling out of the blue one morning.Fires right up and drives but rough. P0306 code.Engine light flashes when driving but is steady when idling. Changed spark plug from cyl 6 to 4. Still reads misfire on cyl 6. Installed new wires, cap, and rotor. Plugs are burning clean, no signs of fouling. 179,000 miles. Fuel pump was changed 30,000 ago. Could it be the coil? There is spark going to cyl 6 through the wire. Any advice would be appreciated.
I'm guessing it's some type of electrical failure..how much for a diagnosis, and or replacement of damaged electrical wiring...not sure whats wrong
Someone tried to break in my truck and yanked the gear shift down into neutral and broke it off can it be replaced or do
i need to replace the whole column?
Had a check engine light come on this weekend both times were when I was accelerating up a steep mountain pass. The light would come on and then flash throughout acceleration. Eventually just staying on. The code said it was a Cylinder #4 misfire. Don't remember the code number though. This is the first time this has coded this code. Just recently replaced an o2 sensor that was coding Bank #2 Sensor #2. Any relation? And should I start with the plug or is this something bigger?
started in the 32 degree weather we have nere in VA.
installed vortex 5.7 engine ran good on highway for 15 minutes then it went dead I replaced the battery towed it home now it misfires trying to set the timing continues to misfire any suggestions
MY DRL DO NOT WORK FUSEES ARE GOOD AND I CAN NOT FIND A RELAY FOR IT THE OWNERS BOOK SHOWS FUSES ONLY NO RELAY COULD IT BE THE EMERGENCY BRAKE SWITCH IF YOU HAVE ANY IDEA WHAT IT COULD BE PLEASE LET ME KNOW
my daytime running lights do not work fuses are good what could be the prolem
The timing chain broke, I replaced it, aligned the marks on the crank & cam shafts, brought #1 plug up, but I still dont have any fire. What's wrong? Am I missing a step?
Our 99 Yukon will blow cold air out of the rear but not in the front. Has a new control unit in dash, compressor works fine. The cold air is not coming through the vents in the front. Would like to know what problem could be, and if there is somewhere I can find a service diagram of what's under the dash, so I may be able to fix it myself. Thank you.
glass on my driver side mirror broke. How do I replace it?