Hey all I had a weird thing happen this morning. I have an 08 yukon xl denali and just to give background. I had recently had abs ad traction control issues that causes a limp mode. i thought I was going to have to change ecm. I tightened grounds on battery and truck runs great. well this morning I left for work as normal and while coming to a stop she stalled out. she wouldnt start back up. I called for a tow but thenI decided to try to start it again and turned the key and gave it gas and it roared to life. I drove it back home and it ran until I slowed down to pull into driveway and it stalled again. started up the same way by giving it gas and pulled the rest of the way up to property. truck sat there running great while I started other car and when I shut it off it started right back up. no check engine light at all. and only thing on dash is suspension system and service brakes soon. I recently changed caliper and I dont think I got all the air out which is why I believe the service brakes soon is on as the rotors and pads are new front and rear. anyway The stalling is what I am lost on. I replaced the fuel pump last year. I hope that is not the issue again.
Stalled out
- Thread starter Tatman48
- Start date
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Time for basics testing. I would start with the fuel pressure and if you have a Tech 2 see if can duplicate on a close short test drive. What brand of pump did you install?
I do not know who made the fuel pump and I do not own a tech 2. I am a home mechanic and I cant afford that type of scanner. I will check fuel pressure I guess. I went with a cheaper fuel pump as it was when I only had 1 vehicle and didnt have a ton of money. so since I went the lower end rout I am thinking that is it but It just seems weird that it idles fine and drives fine but stalls on deceleration
When is the last time you cleaned the MAF and throttle plate? MAF cleaner is available at the parts store and follow directions on the container. Plenty of you tubes out there on how to do the throttle plate. Watch 2-3 you tubes on that because they are not all the same. Best if have fuel pressure readings when problem happens. Long hose attachment means you can snake out at back of hood and tape to windshield to see. You can get Tech 2 scanners at ebay for $350.
I cleaned the throttle body last year really good when I removed intake manifold to change oil pressure sensor. I also did a soak and deep clean on intake manifold as well. I will look for a fuel pressure gauge so I can check it. The truck runs and idles smooth and I watch y t videos on everything I do.. it's how I knew what to do when I had to change a 4 dollar o-ring for the pickup tube which sucked. It is just so frustrating that these things are so sensitive to the smallest electrical inconsistency...
not sure how transmission caused this. truck runs perfect at idle and while driving ans shifting. it stalled when coming to a stop and then acted flooded when i tried to restart it. after 10 min i turned the key and pushed gas and it fired up and drove it back home normal until I hit the brakes to pull into driveway and then she stalled again, so I am very doubtful it is transmission. I am leaning fuel pump or the purge valve. as I said it runs and idles great..
Torque converter stays locked up, either from a failing TC or the solenoids or the valve body controlling it. Try a bottle of this before you do anything. This is the cheapest thing you can do. And search this formum for my issue. I’ve documented my issues pretty extensively and I had the same symptoms. Including the crappy feeling you have right now with someone telling you have a failing trans.
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i read your entire post and I have had similar, but my abs and traction control coming on and then going into limp mode turned out to be a bad ground connection at battery. these electrical gremlins are a nightmare. end of 2018 I ended up replacing the ecm when the car went nuts, and shop couldnt figure out what was up. I get absolutely no check engine lights, no codes, nothing. it just stalled and we have been driving our ccadi that has no heat unless we are moving so now that i see I an just keep getting it started I will drive with heat instead. this truck runs great smooth and what not, but man the gremlins are crazy. I had the trans control module removed after I bought it and the wafers replaced or the little membranes that go in it. but I dont have any trans codes. my buddy has snap on scanner and it doesnt come up with anything. havent done live data yet but we will. I will buy a scanner here soon.
iamdub
Full Access Member
Based on your input, I'm suspecting a faulty throttle position sensor (built into the throttle body) or an intermittent open circuit in the harness, like at the plug.
This stalling while rolling to stop torque converter problem and the electrical problems caused by ground connection problems are well documented here on the forum. Many threads about dirty MAF and throttle body cleaning as well and a bunch of fuel pump problem scenarios. IMO, these seem to be a top 5 of many hair pulling problems on here.
Agreed... I am really struggt with this because I still owe money on this thing and throwing more and more into it. I might do throttle position sensor and go from there. I ordered the transmission protectant mentioned earlier so I will put that in as well.
Please let us know what happens. I hate to see someone still owing money going thru these types of gremlins.
This failure will throw a code. If there isn’t a code, it’s almost certain a mechanical failure.
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If you must though, buy from amazon warehouse and you can just return it when it doesn’t fix the problem. That’s what I did. [emoji3]
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If you must though, buy from amazon warehouse and you can just return it when it doesn’t fix the problem. That’s what I did. [emoji3]
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I appreciate that and as a veteran my self let me say to you. "THANK YOU FOR YOUR SERVICE" ... I have no choice but to keep on keepin on lol. I have more time than money so it just means more garage time.
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