I took my Denali on a about an 80 mile trip about 2 months ago. I ran fine at highway speeds but once I got into more stop and go. I noticed that my denali was hesitating while shifting. not really slipping. just staying in 1st for too long. I haven't had it on a long run since then.
Any idea what it could be.
Tim
2004 GMC Yukon Denali XL AWD 6.0
1995 Suburban LT 4x4 soon to have LS power.
Well it happened today when I was coming home from work. I got on it to get around some slow traffic after getting on the highway. After letting off, I could gas it yet nothing happened then all of the sudden it would hit, it happened a couple times, almost seeming like I was in neutral. it really started to drop speed until dropped it out of drive into 3 and seemed better, then started happening again. After getting off the highway it seemed to act up all the way home, ( about 2 miles) Speeds 30-40mph.
I just hope the tranny isn't going, it has 177K.
Tim
2004 GMC Yukon Denali XL AWD 6.0
1995 Suburban LT 4x4 soon to have LS power.
Check the DTCs to see if any codes are showing.
Ever have it maintenanced?
2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
2002 Silverado - 427Lsx w/ Twin gt4202s
2010 Silverado crewcab Z71 - 5.3litre w/ procharger
2000 Wrangler - 5.3litre with some stance
2014 Xsport- 3.5 Eco boost
412 Motorsports
it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference
its shifting late and does better when out of d? how many times does it shift when you take it down the road? and how is reverse?
its just a turbo 5.3 that a couple of kids threw together
01 silverado
09 cobalt ss
The only DTC that shows is IIRC 148 bank 2 lean condition. I have not had the tranny serviced since I have owned it.
2004 GMC Yukon Denali XL AWD 6.0
1995 Suburban LT 4x4 soon to have LS power.
Check your map sensor connection, they get corrosion in there. I had to take the connector apart, and found the crimp connection all green and fuzzy. Sometimes it worked ok, sometimes it worked half ass but hard to diagnose until it failed completely. Caused similar issues at first signs of going bad. Thought my trans was possessed.
swap : 88 k5 Blazer w/ 2004 5.3 & 4l60e, 212/218 cam
CAI, shortie headers, TCI 2600 stall, transgo shift kit,
Nelson tuned
i would change the fluid and see if that helps, sounds like the tranny is slipping
1989 RCSS 5.3/4L60E swap
- 224/230 .581.591 112lsa,
- 3200 Stall
- DJM 4/6 drop
- Nelson Tuned
Building the truck GM never did..
I would replace the fuel filter and cross my fingers that the pump stays healthy.
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