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Found 7 results

  1. Coming home from a four-hour trip Sunday towing a small utility trailer, my truck dropped to idle while at speed on the interstate just a few miles from home. I was lucky and able to pull over to an exit ramp with zero power. While coasting the display popped up saying reduced power for a couple of seconds and the engine light came on. While still on the exit, all power restored, message went away, and I was able to make it home on back roads. While it was still running I pulled three codes: P0087, P129F and P228B. Cut it off, unloaded everything and then went to move the trailer. It turned over for a few seconds then busted off (longer than normal). As soon as I put it in gear it shut off. Got it to the dealership and awaiting the results. Truck only has 1,404 miles on it and was delivered from Flint a few weeks ago. All displays read fine, fuel filter, DEF fluid, etc. Engine light still on. Just FYI to add to the list of L5P problems
  2. Hey guys, I need some help. Recently my only vehicle, an 03 2500hd 6.0 4x4 started to hesitate during start up. It bogs down as if it sounds like it is not getting any fuel when i step on the gas. Instead of revving up, it sounds as if it is choking on too much air, and no fuel. I changed the oil, filter, and air, and filled with gas from one of the two gas stations I always fill at. I have owned this truck most if its life, 11 yrs and 180k+ miles on her. When it started doing it the temperature outside was about 45-48 degrees, and I was coming off a graveyard shift. At the same time, it was choking and struggling to stay running, the computer (dash gauges and info center) also started freaking out and throwing messages “change engine oil” and “oil life reset” and “loss of engine power”. Once it quit, the distance to empty now was not reading the same as it was when i shut it off at midnight. In fact about 70 miles less, and the gauge still said full. Once it was “stable” to drive home, on one of the hills i was climbing, clearly the motor was loosing power, tranny wasnt downshifting, and loosing speed quickly, and some hesitation. However at the top of the hill, it ran just fine. Fast forward a day, started fine, ran fine. Next day, changed some bushings on the lift, drove into town just fine. When I left the store, started just fine, backed out and started to to proceed to the exit, and it started hesitating again. Cleared up after about 10 seconds, then on my merry way again. Got to the house, luckily, and it started the whole cycle over again. Throttle response was all but gone, sounded as if it was bogging or flooding the motor with air, but under idle struggling to stay at running, and choking, rpms are below 500 when it does it. Once I get the motor to stabilize with the feathering if the throttle, i can put my foot into it and it revs just fine. Computer still shows 187 mi to empty, when it was 265. The things I have done to this truck since I have owned it are, new (used) transfer case, new front end ( multiple times) , new (reman) dash gauge cluster, change plugs, water pump, k and n, batteries, window regulators, new climate control unit. I hope you guys can help, before having to ATTEMPT to take it anywhere.
  3. I have a 94 3500HD, starts up fine and runs good, but after about a minute of running it starts running rough and it will loose power and acceleration, will not go over 25MPH, does anybody have any ideas of what it could be?
  4. My GMC Yukon 05 model 5.3L was given to me by a friend because I had recently wrecked my 15 Silverado. I knew and he knew as well that the Yukon wasn't running very good. It would fire right up but it would idle as if out of time or something was stopped up. We put a scanner on it and we had so many codes pop up. the knock sensor code was the first one I tackled by replacing both knock sensors. replaced the intake gasket. I have put a new mass air flow sensor on it and plugs and plug wires. after putting everything back together I cranked back up and it was running worst. clear the codes hooked it back up to the reader and had these 2 codes pop up. P0101(MASS AIR FLOW) even after replacing the old with the new . P0449(EVAPORATIVE SILONOID) I'VE GOT A BRAND NEW ONE BUT HAVEN'T REPLACED IT. what should I do from here need help please point me in the right direction. What should I do next?
  5. Hey guys, new here and frustrated... I own a 2004 Yukon XL 4x4 2500 6.0l 210k my issues consist of a slew of codes and terrible towing power with moderate fuel mileage. Here's my codes P0446, P0452, P1516, P0300 Those are my current codes, now the problems in having is sluggish pulling power under normal driving conditon with no load seems to run fine but just seems the 6.0l should have much more than she does. Under a 10k load she struggles, big time. Higher rpm over 3k. She clanks she sputters she pings and doesn't shift until throttle is released. rough idle at random times. 14mpg consistently I had the dreaded "engine power loss" but I pulled throttle body cleaned the crap out of it and replaced a broken ground wire from hood to firewall don't know which one fixed it but I have yet to have that issue pop back up since. But now it is this issue. I need assistance asap I use this truck to pull on a daily basis and it's so frusturating being the slow person rolling up a slight incline with a trailer Thank you all in advance for any advice, any input is appreciated I am not familiar with the 6.0 nor the entire vortec system.
  6. Alright for starters im new to this forum but I'm curious for answers. I have a 2003 Silverado ext cab Z71 LT it has the 5.3 vortec V8. About six months ago it had a cylinder misfire and I decided it had been a while for a plug and wire change and that it was most likely the culprit. Changed the plugs only, and the misfire went away. About two weeks after misfire came back went ahead and changed the wires to avail. Tested for spark and found that I had a bad coil so I changed it out. Misfire still there. Ran codes came back for a bad MAF sensor replaced the MAF sensor and it didn't changed. Ran codes again said I was pulling in to much air in both banks. Did some research and a smoke test, ultimately replaced the intake manifold gasket still have the Misfire ran for codes again came back as bad MAF sensor again had the one I put in replaced under warranty, still no change. Any ideas on what next? It's only misfiring on one cylinder cylinder two. And it's always been cylinder two. She has 255k miles on her and up until the cylinder misfire has run like a top the whole way. Any help or ideas would be great guys thanks in advance.
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