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Found 19 results

  1. Hey Everyone- I have a 2022 AT4 (5700mi) and its it has a shudder/hesitation during steady and/or light throttle acceleration between 25 and 70 MPH. Anyone else experiencing this or has and got it "fixed". Reproduced it for a ride along with the dealer, but need to figure out a plan or approach to fix this. They have mentioned maybe a fuel injector, maybe a new transmission.... Thoughts? Recommendations? Also, what site does everyone use to search for TSB's?
  2. Anyone else experiencing a hard shift or hesitation of the engine when you first hit the gas. For example, I start the truck, reverse out of the driveway, put the car in drive and when I hit the gas, the truck goes toward and then i feel the truck completely stop for a second (hesitation) and then it continues forward, I only expierence this when I’m going from reverse to forward. I come to a complete stop and do not shift to drive when moving backwards still. ?
  3. I have a 2000 Silverado 2500 6.0 that is having some hesitation/cutting out on acceleration. It’s weird it seems like if you ease into the throttle it doesn’t cut out but if you mash on the gas it acts like it wants to die. It does it in park and in drive. First noticed it when I was pulling my boat out of the lake and I could barely make it up the boat ramp, it was spitting in sputtering until it eventually seems like it cleared up and started going normal. I replaced the spark plugs, spark plug wires, fuel pump, fuel filter, ran seafoam through the gas, and change the air filter but it seems to not of helped there’s also no check engine light. What could be the issue, thanks!
  4. Hey everybody...I just now joined the forum just to pass along a decent, easy fix for the "flexing" gas pedal in the 2014-2018 Sierras and Silverados. I stumbled across this board researching this issue that I discovered on my new (to me) 2017 Silverado Z71 5.3 that I just bought about 4 weeks ago with 788 miles (yeah, seven hundred eighty-eight!) on her. Upon starting from a stopped position (such as coming off a stop bar at a traffic signal), I was a bit bothered by what I can only describe as a "hesitation" of movement of the truck, where pressure on my right foot on the accelerator that wasn't immediately (and proportionally) resulting in matching acceleration of the vehicle. This is the same issue described in other posts on this board that has been remedied with (among other things) by placing cut pieces of paint stirring sticks behind the plastic "anchor plate" that is affixed to the firewall, and where the accelerator sensor is bolted on to. I had plenty of flex in mine, on the order of probably 1/2" to 5/8" at least where the mounting plate would flex and finally "bottom out" against the firewall before the accelerator would begin to respond to input. The fix I came up with was a pretty simple one, and I wanted to pass it along: On the black plastic mounting plate (Those of you who have researched this issue probably already are familiar with this piece I'm referring to), near the bottom where the gas pedal mounting bracket is affixed, there is an unused hole to the lower left of the pedal bracket. I used a 1/4" x 20 bolt (about 1.75" in length) with a nut and washer pre-threaded onto the bolt, and slipped another 1/4" nut on the backside of the black plastic mounting bracket (using 90 degree needle nose pliers to hold nut in place while finger-tightening bolt...this was the most tricky part). This required trimming just a little bit of the floorboard insulation (see photo below) to make it easier inserting the nut behind the plastic piece. Then I simply tightened the bolt into the nut on the back side, which results in approximately 1/2" or so of the bolt protruding through the backside of the black plastic plate and bottoming out on the firewall. The result is MUCH less flex in the lower portion of that plastic mounting plate when pushing on the accelerator. I really was skeptical of how much difference this would make, but WOW...after driving it, the difference is NIGHT and DAY! That "dead zone" where I was having to push unnaturally hard on the accelerator pedal before seeing any response from the engine is GONE! Now I can lightly push on the pedal and the response is IMMEDIATE and smooth! Attached is a picture showing the finished product (sort of helps what I've tried to describe above). I should have taken a few more pics during the procedure, but I was sort of on a roll and didn't think about taking any until I was finished. Hopefully this fix comes in handy for others of you having this same issue related to the "spongy" accelerator mounting plate. Kind of disheartening to have to fix my ~$36K truck with a $0.50 nut and bolt, but at least it fixed my issue!
  5. Hello, I am hoping that you can help me diagnose what is causing a hesitation on my truck when accelerating from a stop. It sometimes also hesitates when shifting at low speeds 10-30mph Truck Specs 2014 silverado 1500 WT 4.3L V6 locking rear end 32,000 miles no codes, using bluedriver scanner red Problem two weeks ago truck took two tries to start never done this before has not happened again last week truck started hesitating on acceleration from stop every time rpms drop from 1500ish to 500ish and then jump back up and truck accelerates I have attached one of the drive logs where you can see the fuel rail pressure drastically change when the engine rpm drops You can see the seven times the truck hesitated at the drops in the graph Started logging other items to see what is happening and found this spike in the temp sensor, attached picture also. intake temp sensor is yellow line and engine rpm is blue line. I highly doubt the temperature actually went from 55F to 135F during my commute. What I have done Checked transmission fluid, truck level and hot. Fluid in the dashed good zone between the holes. No burnt smell. Found the strange temp reading. Truck off Unplugged the mass air flow sensor and drove around large parking lot. Hesitation completely gone truck drive normally for 5 min. Check engine light off. Truck off Plug in mass air flow sensor and drive around parking lot again. Hesitation back Check engine light on with codes for MAF unplugged. Thought MAF was the issue. Bought new MAF and air filter Installed MAF and air filter Problem gone on test drive for 15min, truck fine, no codes. Next day, hesitation is back, no codes Realize I need help. Post on forum. I'm sure I have left out some important information, just let me know and I'll try to answer. I greatly appreciate the help. Thank you.
  6. After going through a Lemon Law case, and loosing, because of hesitation in my 2018 GMC Z71 1500, I learned a lot about what's going on. The BOTTOM-LINE - GM is intentionally detuning our trucks. This is undisputable. During the deposition phase, GM acknowledge they are intentionally detuning the trucks in an attempt to save approximately 1-2 mpg. What was I experiencing: Hesitation when in Active Fuel Management mode. Hesitation when lightly pushing on the gas When pressing on the accelerator peddle the power was delayed getting to the rear wheels When getting on the gas pedal immediately after braking, there is a HUGE delay When lightly pressing on the accelerator pedal, the RPMs actually go DOWN (WTF???) When going 30 mph the vehicle is already in 6th gear and lugging. This one detuning trick, turns your 350hp vehicle into a Subaru. Extremely slow transmission control to shift into a lower gear. Extremely fast transmission control to shift into a higher gear. So, after loosing, what did I do to fix these issues? I paid to have the truck re-tuned. I waited to almost 60,000 miles when the warranty expired. I am kicking myself for not doing it sooner. I am not affiliated with this guy at all, but I will tell you LEW at diablewtune.com fixed 95% of the issues and I can FINALLY enjoy the drivability of the vehicle, as I would have designed it. It actually pulls hard from a dead stop. I can actually smoke the tires if I wanted. YES, performance over economy in every situation ... finally! So for all you potential buyers out there, don't waste your time. Drive it off the lot and don't hesitate like the truck hesitates and give your vehicle a performance tune immediately.
  7. I have had this problem for quite some time. I've been trying to narrow it down one test and one part at a time with no luck. It will occasionally drive great with no problems but other times it surges while accelerating and driving down the road. I've had the timing checked, replaced the spark plugs, replaced the wires a while back, replaced the EGR valve, and replaced the cap and rotor. The truck will idle fine except for the occasional rough idle in gear during the times the truck is running badly. Any suggestions would be appreciated. Thanks.
  8. Just got the 2014 Silverado 5.3l 4x4 back from the dealership from having the entire top end of the engine replaced ($9000+) at 106,000 miles. Noticed oil on the plugs & immediately started smoking. But NOW - 5 days later, the truck shudders at 35-50 mph, especially if going uphill at a low speed. Does anyone have any suggestions for what this is due to or how to correct it - preferably without spending another $5-10k. This was a great truck up to 100k miles, but now it seems to be falling apart. Put a Hypertech programmer on it in late 2017/early 2018 to turn off the afv, (at about 70k miles & that's all I used it for), hoping to avoid the problems that causes, but no luck. Now this transmission thing is happening. It used to shift hard at low speed & when cold, but this shuddering is new.
  9. It hesitates a little on almost every take off from a stop. Much more pronounced if I throttle it more. I.E. it is impossible to just launch out from a light most of the time. It's just sluggish until it kicks in after a second. The worst is around 45-50 in OD under partial load just trying to maintain speed... It misses enough to shake the whole truck and I have to punch it to get out of OD so I don't feel it anymore. I'm sure it's missing a little at other times but I can't feel near as much if the torque clutch is not engaged. I got a new MAF free from my neighbor so I threw it on today but it made no difference. My long term fuel trims are near zero at idle but jump up near 20 under acceleration and while driving they maintain around 15 or more. Do I just need new injectors? I have gotten a lean code both banks before but it's been a few months since that came up. New fuel pump only about a month old. Made no difference at all. I also did intake manifold gaskets this year. No change really. Need more ideas. Thanks!!
  10. Truck Does Not Run Right...Tachometer Bounces...Hesitation from the start...Going up hills is Jumpy...Skips and Bucks, Feels like truck is Misfiring...Transmission shifts are consistently Rough and Random... Dealership confirmed the problem after test driving and they then found TSB #PIP5457C: Surge hesitation Chuggle Misfire Feeling With A Light Tip In - (Feb 10, 2017) which they believe match's the problem. The Dealership says GMC is aware of this (TSB #PIP5457C) the cause is unknown at this time. Do Not Know How Long It Could Take To Get A Fix. I called GMC customer assistance and requested a replacement or buyback they opened up a case number for me. They next day GMC customer assistance denied any kind of replacement, trade assistance, or buy back. Closed my case because they do not know what the cause is at this time and do not have a fix for the problem. I was told I must drive the truck (AS IS) until such time a fix is available. They also encouraged me to exercise the Lemon Laws in my state if I wished to pursue a replacement or a buy back. Extremely unhappy with my first GMC Truck and that's a shame because it’s a beautiful truck It just happens to be a Lemon that runs like Crap... Just keep driving (AS IS) is not what I paid for...I hope someone else has any insight to how to fix this problem. I hope others will post there concerns as well so we can get these trucks fixed or replaced...
  11. All My first problem, and post with my 2014 silverado , regular cab, 75000 miles, 4.3L auto trans. Hope I explain this well. This just started abruptly today. While coasting in drive, under 45 MPH, it feels like brake lightly/quickly applied, or converter lock up about every 2 seconds until stop. Very lightly, but feels harsher if brakes are applied lightly. Goes away when shifted into neutral while coasting. Gut feeling is torque converter locking up for unkown reason. Ideas? Thanks, Kevin
  12. 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.
  13. Recently my 2006 Silverado 5.3 litre has been having some rough idle issues. The issues are intermittent, but most of the time the truck doesn't start idling rough until it is to operating temperature. Also, my truck has a slight hesitation from take off, never throwing a check engine light though. Recently I changed all the plugs with Ac Delco iridiums and put new wires on the truck as well. The MAF sensor has been cleaned along with the throttle body (the throttle body was barely dirty). After going through what I thought would fix the problem, I thought I would try some Techron in it, so I ran the tank down to about empty and threw some in and filled it up. The truck ran absolutely amazing with the Techron in the tank, smoothed right out, the rough idle and hesitation were gone. After I went through the tank filled with Techron and filled up with another tank of gas, the rough idle and hesitation came back... Does anyone have any ideas what could cause this, or has anyone had this happen to them? And by the way, the truck only has 66,000 miles on it...
  14. Not to be to cliche...but Help please. So here is the full run down. About a year ago my Yukon started what i can only call a severe hesitation, it got so bad that i took it to the dealership. They had it for a month and a half and claimed to have replaced everything but the computer with "known good" parts. I was unwilling to spend 2000 on a computer and reprogram that may not be the problem. This year it got so bad i bought a computer from LKQ and had it programmed by the dealer. It seemed better but never went completely away. I have since replaced the throttle position sensor, Maf Sensor, Cleaned the K&N filter and completely cleaned the throttle body, all of which the dealership claimed to have already swapped, but I just couldnt believe that once all that was done it didnt fix it. I considered trading her in, but just cant part with her. She has no codes and idles fine, its just when I press the pedal it feels like its just bogging down. It is odd to me that when I replaced the computer, and cleaned the maf it got so much better. I am desperate. My hope is one of you is that guy who knows everything and know exactly what it is. I have read every forum i could find and just cant find anything that matches my symptoms exactly. Please Help, Thank you in advance
  15. At about 5,000 miles, our 2015 GMC Yukon XL SLT started to shudder and hesitate when stopped at a stoplight. We are now at 17,000 miles and the problem has gotten worse. Feels like the vehicle is about to stall. We are using the correct fuel type. Each visit to GMC dealer says that they have not received a repair bulletin from GM although they are asking for one. I am not the only one with this issue, but GM refuses to address the problem and come up with a fix. Last time they did something to the engine mounts (an existing repair bulletin) but it did not fix the issue at all. If you are having this same issue please join a forum and report the problem. Please also report the problem to your dealer. We are very unhappy that a new vehicle has this issue. Maybe the transmission needs to be replaced? The shuddering happens less if we put the vehicle in park at a stoplight, but it still happens. How long could this vehicle possibly last if within 5,000 miles there is this issue. Now at 17,000 miles the shuddering is getting even worse. But still no fix from GM. I thought we were "Professional Grade". Any comments or suggestions appreciated, but whatever GM has already put out there is not helping anything. I can't believe we spent that kind of money and have this issue.
  16. I have a 1988 Chevy K1500 5.7L 350ci TBI truck and it has been acting up here lately it all started about a month ago. I would go to accelerate while going down the road and it would hesitate and bog down. When it happens I can feel a pulse in the gas pedal and hear an audible sound in the engine compartment(it sounds as though the throttle body is slamming back into place as though its not recieving enough gas). The truck DOES NOT act up during idle or when running at low speeds, ONLY WHEN ACCELERATING. And the problem does not happen everytime I drive, it happens here and there. I have checked the spark plugs and they are a brown color on the tip which tells me that there isn't a rich/lean problem with the plugs. I have also changed the fuel filter, which was FILTHY, after I had gotten the new filter installed I dumped the contents of the fuel filter onto a rag and the contents were a silver/greyish substance. I have not heard of a filter having this color debris in it, so I am wondering what the debris is and what is causing my truck to hesitate? The hesitation only happens when I press the gas pedal down a good ways to accelerate, like going up a hill or after a stop light when I am trying to reach the speed limit without creeping up to speed. After I changed the fuel filter the truck ran fine when I took it out to test that fix, and I thought that is had fixed it because I would stomp on the gas to put it in high hear and see if it would hesitate and it did not. The next day I went out and the problem had returned, so it doesn't happen all the time, but it happens more than not. I only run Shell 93 gas in the truck and take very good care of it. I have gotten to a point where I can't figure out what is wrong with out. I have also taken the air filter housing off and started the truck to see if the injectors are giving an equal amount of gas and they are. I have tried to put everything wrong and that I have done in this post that I can think of, if y'all have any more questions feel free to ask. I would appreciate any help at all with this problem! Thank y'all!
  17. Hey guys, I'm new to the forum and am in desperate need of help. In the past two weeks my truck has been low on power, my fuel economy sucks, and it feels like its hesitating or misfiring. I've already replaced spark plugs, my cap and rotor, coil, and coolant temperature sensor and nothing has fixed this misfire/hesitation. When I took the plugs out a few of them had a white/grey build up that I've never seen before and I figured that had to be it but it wasn't. Do I need a distributor next? I also recently put in a new fuel pump and filter so that's not the problem. Help me out guys, if yall need anymore info just ask! Thanks!
  18. hi, i have a 97 chevy c1500 4.3 vortex v6 that was given to me. It had sat for about a year and a half before i picked it up. When i received it i put a new fuel pump and filter cleaned out the gas tank. It ran fine for 2 or 3 days and i drove 45 miles and it run fine. one day i drove it about 20 miles and it stalled, immediately when it started it would go then cut out again you couldn't go 50 ft without it losing power. The next day i changed the tps then cleaned the aic helped slightly but not much. Well come to find out my catalytic converter was blowing out honeycomb so we replaced it with a muffler since the real muffler had been cut (and no not directly under the truck we piped it out then put the muffler under the bed). It will idle but still wont run correctly i have heard there might be 2 fuel filters i will check that tomorrow. i will also ohm the 02 sensors to make sure the are working properly but they appear to be fine. Can anyone help me?
  19. Drove my 05 Sierra (4.8) hard yesterday and found that at high RPM it seemed to get starved for fuel. The truck started to hesitate - kind of stutter - as I drove. Happens when accelerating to pass or other hard acceleration. Fuel filter? Fuel pump?
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