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  1. Hello. I have a Silverado 1500 4.8L base model with 200K miles. I could use some guidance on how to troubleshoot two engine codes that my truck has. P0101 and P0171. I erased the codes, unfortunately. This is what I have done thus far: -Inspected the Air filter (it is clean) - Cleaned the MAF sensor with MAF cleaner. - The MAF values are responsive to changes in engine RPM. I don't have any special tools to check for vacuum leaks. I Took live readings with my Zurich ZR8 code reader The LTFT1 and LTFT2 hover around +14% when engine warm and idling around 600 RPM
  2. I started off with a search but most were for GMT800s. Just yesterday my 2009 Silverado 5.3 started throwing P0300 codes. The only real change that's happened recently is it's gotten quite hot out compared to when I got it over the spring. It's always had a bit of a stumble at idle, but nothing serious. I noticed today going up a steep incline under load on the highway, the MIL was flashing. Seems like there's a lot of potential answers for this code as well: Bad spark plugs Bad ignition coils Fuel delivery problems collapsed lifters Crank Variation Rele
  3. Hello I have a 2000 GMC Sierra 5.3 4x4, it has been sitting for 6 months. First thing I did was change the oil, next I drained the old gas and put new gas in. The truck would crank but not turn over. I replaced the fuel filter, and replaced the fuel regulator. Prior to replacing the fuel regulator I had no fuel pressure, gas was leaking through the diaphragm of the regulator into the intake manifold. Once I replaced the above items fuel pressure was up to 50psi with key in start position. The truck fired right up no problem but, there was a very loud ticking sound that sped up and got louder w
  4. Hello I have a 2000 GMC Sierra 5.3 4x4, it has been sitting for 6 months. First thing I did was change the oil, next I drained the old gas and put new gas in. The truck would crank but not turn over. I replaced the fuel filter, and replaced the fuel regulator. Prior to replacing the fuel regulator I had no fuel pressure, gas was leaking through the diaphragm of the regulator into the intake manifold. Once I replaced the above items fuel pressure was up to 50psi with key in start position. The truck fired right up no problem but, there was a very loud ticking sound that sped up and got louder w
  5. Hello I have a 2000 GMC Sierra 5.3 4x4, it has been sitting for 6 months. First thing I did was change the oil, next I drained the old gas and put new gas in. The truck would crank but not turn over. I replaced the fuel filter, and replaced the fuel regulator. Prior to replacing the fuel regulator I had no fuel pressure, gas was leaking through the diaphragm of the regulator into the intake manifold. Once I replaced the above items fuel pressure was up to 50psi with key in start position. The truck fired right up no problem but, there was a very loud ticking sound that sped up and got louder w
  6. What's the word everyone. Full disclosure, this post will officially mark my first ever post on any forum board. Over the last 20 years give or take, I've utilized the forum boards in research efforts to gain knowledge. Subsequently stumbled upon case studies that were valuable bits of knowledge that happened to be very handy long after i had read them. And on certain rainy days forums have even been an outlet of entertainment! However, it wasn't until earlier this year that i ever took the time to register an account and devuldge deeper into the community of a forums page and I honestly could
  7. Anyone have any advice on what would cause a 2015 silverado to throw these three codes, p219b, p0050 and p0300. My truck misses when its cold but as soon as it warms up the check engine light will go out and it'll run fine. The p219b says its a fuel injector but i'm sure it isn't that beings it runs fine after it warms up. I've run Lucas fuel injector cleaner through it several times and ran some sea foam through it.
  8. What’s up guys, Having a random cold start rough idle issue with my ‘16 suburban with the ecotec 5.3. This happens completely randomly, typically when colder temperatures outside but not always. MIL will be triggered but will go away after some driving. Some instances it flashes and then will go off. Sometimes when the light is triggered the ABS and stabilitrack light will be on and the transmission will roughly upshift and downshift. The indicator light will go away and typically the shifting will be fixed by shutting the vehicle off for a period of time and then re-starting every
  9. 2007 Silverado 5.3 V8 with AFM with 180,000 miles Truck had lifter ticking sound and white smoke upon every start up which would go away after a few minutes, no check engine light Replacement list : - headgasket - valve gaskets - upgraded drivers side valve cover - valve stem seals - intake manifold gasket - exhaust manifold gasket - 8 new afm lifters - 8 new non-afm lifters - head gasket bolts - engine coolant temperature sensor - spark plugs - spark plug wires - fuel injectors - water pump - th
  10. 2014 Silverado 1500 2wd 4.3l DI. 150,000 miles. Fleet vehicle with decos oil changes every 4,000 miles. Came in with a misfire. Counters showed cyl 1. Replaced plugs and wires (Delco). No change. Looked at injector balance and seemed to have a bad #1 injector. Replaced 1,3, and 5 injectors (delco) and the 2 stainless under manifold fuel lines. No change. Removed 1 and 3 plugs compression seemed very low on cyl 1. Performed induction service (BG). No change. Re-performed compression test. Much better 210 psi but still running like crap. Pulled left valve cover and removed #1 cyl rockers to clos
  11. 2003 GMC Sonoma 4.3l 93k miles P0300 random misfire nightmare Runs a little better after new spider injector assembly but still has random misfire code. Blinking check engine light goes off at higher rpm’s. Runs real smooth over 1500 rpm’s. Lower rpm’s get random misfire code and CAT starts stinking, motor bounces a little and can feel misfire but it’s a lot less now. Get a backfire when putting in gear (reverse or drive) and even in park when rpm’s go below 1000 and motor shakes and hesitates a second then holds idle. Doesn’t die below 1500
  12. Ok, so here's the deal my truck keeps throwing the P0300 code (multiple cylinder misfire) and we can't figure out what is wrong with it. We've changed the knock sensor, the crank position sensor, changed the whole distributor to a MSD billet distributor (street fire model), changed plugs and wires, changed the coil. None of them have changed the fact that it keeps throwing this code. I also have the upgraded acdelco Spyder injection system. The motor is a freshly built 383 stroker built by a reputable engine builder when we first started the truck it ran like shit so we sent the computer to bl
  13. I recently noticed my check engine light was on, once I scanned it it came up with the codes P0155 and P0300. A while back I had to engine swap my truck, the engine stayed a 5.3 but the year of the motor changed. Before I did any engine work no check engine light was on (this was a couple of months ago, yes I am aware parts break and need replacement but I'm not sure where to start or if its a programming thing). I have only a one year old exhaust system, along with sensors. I have yet to look and see if any connectors or wires have corroded. In terms of misfire, I have all new spark plugs and
  14. This is driving me insane, 2000 Silverado 4.8 vortec has codes for random missfire and apparently all cylinders are missing about the same amount of times according to the Chevy dealer. I noticed a small intake manifold gasket leak (truck would barely run on cold cold starts till it warmed up) so I replaced the intake manifold gaskets and did multiple smoke tests confirming no air leaks... I have checked each individual spark plug for spark, they all do. Had fuel pressure within spec. Removed all injector connectors 1 at a time and they all made a big difference (all are working in pretty sure
  15. This is driving me insane, 2000 Silverado 4.8 vortec has codes for random missfire and apparently all cylinders are missing about the same amount of times according to the Chevy dealer. I noticed a small intake manifold gasket leak (truck would barely run on cold cold starts till it warmed up) so I replaced the intake manifold gaskets and did multiple smoke tests confirming no air leaks... I have checked each individual spark plug for spark, they all do. Had fuel pressure within spec. Removed all injector connectors 1 at a time and they all made a big difference (all are working in pretty sure
  16. I'm getting frustrated, I have a 2001 2500 HD, 6.0 liter, I parked it for about a year or so and when I got it out it was running rough, keeps giving me the Po300 code multiple misfire, I changed the spark plugs and this did not help, so I starting looking other places, I found a couple of injectors that weren't working, so I changed them out with some rebuilt ones I bought on Ebay, I installed them and it seems to be hitting on the cylinders that were not working but still runs rough but now it pops out the exhaust and I still get the code, so I changed the spark plug wires si
  17. Hello, I recently inherited a 1999 Tahoe LT 4x4, 5.7L Vortec, Auto, 194K miles. Codes are P0300 and P0304. cylinder 4 has no compression. Fuel pressure is 55psi, Spark is steady and strong on all wires as indicated with an inline spark tester and timing light. 120-125psi on all other cylinders to include 2 and 6. No milk in the oil. I have not not taken off the valve cover yet to see what’s going on with valve springs yet. My question is “what sequence should I try to see if it’s springs, valves, seats, rings, pushrods, lifters, etc?” Thanks,
  18. How's it going, I have a 2000 single cab 4.8 Silverado 1500 that has a misfire, gradually revving up the engine you can tell the engine is missing and causes truck to vibrate, and vibration is worse while driving. Has following codes: p0300, p0137, p0141, p0157. I believe these are codes for random engine misfire and various 02 sensors? If someone could point me in the right direction I would really appreciate it thanks
  19. I have a 2001 silverado with the 5.3. It has about 153,000 miles and I have been having an issue that I haven't been able to track down. At idle it has a miss at idle, whether it is cold or warm. My knowledge says it is a vacuum leak somewhere that I cant find. There is no miss at any other rpm than idle. Recently as it has been getting colder (sub-30 degrees F) when I first start the pickup it shakes violently at idle, but after it warms up for about 30 seconds it runs as normal. Today when I started it and was warming it up my SES light started blinking, even though it was idling as normal.
  20. I did a search on here for replacing the engine computer and was surprised for not finding much ! We have an 05 Silverado with a 5.3 in it. The other evening, my wife went to see a friend and when it began to storm, she decided to leave. She went out and the truck was dead, no click, no crank. I went to get her and tried to jump start it (while it was still storming) and arcs came off of the negative terminal when the cable touched it. I stopped and decided to disconnect the battery till morning. Next day I go over there and reconnect the battery and the engine fans start running with n
  21. Gonna get right to the point by stating the facts that I do know. I have a 2001 Tahoe with a 5.3 Vortec with 165k miles. Check engine light has been coming on the past four winters. It started out a temperatures <10 degrees, and now has gradually gotten worse to <35 degrees. Same codes every time, P0171, P0174, and P0300, Lean bank 1 and 2, and random misfire. Most noticeable is rough idle, the colder it gets, the worse it is. After reaching operating temperature, it idles smooth, with plenty of power and never misses a lick. Last winter fuel pump, filter, and all lines from tank to man
  22. okay so here goes: 2005 silverado 1500 hd, 6.0 135k. Codes p2135 throttle pedal position sensor switch a/b voltage corelation, p0300 random multiple cylinder missfire detected, p0120 throttle pedal position/switch a circut. I have been fighting this isuue for the last two years and it is getting to the point I am ready to sell. I hate to do that as the truck is in overall great shape, well maintained with no other mechanical issues. As I said this issue has been going on for at least two years with some limited success for intermittent times at a resolution. I have replaced at dif
  23. Hello All, I have an ongoing issue I was hoping to get a few opinions on. A few weeks ago my truck started to gradually spudder when I was cruising with the RPMs jumping very slightly when it did. I did not notice it being related to transmission as it was shifting just fine so I figured ignition/timing. The check engine light came on with the error codes p0016 and p0300, camshaft/crankshaft misalignment and multiple misfires, respectively. I needed some brake work done anyway so I took it in to get serviced and they replaced the distributor rotor, cap, wires, sensor and all the coil packs
  24. A week or so ago I noticed a ticking after my truck was warmed up at idle. Well a few days went by and my truck started to misfire as I accelerated from a stop clearing up once i got up to speed. Along with a flashing check engine light I had the codes P0300, P0455, P0306. The next day I bought a new evap solenoid canister hoping to get rid of the evap code. After installing, I still had a misfire and a ticking coming from the passenger side bank. I plugged in my code reading and watched cylinder 6 consistantly misfire at idle. After replacing the plugs, checking the injectors, coils, and wire
  25. We've had a bunch of things happen at once to this 2007 Yukon XL 5.3 4WD, and I suspect it's all part of the same problem. Besides the above problems, we also have rough idle, and it occasionally shifts hard out of first gear. I've searched this forum and others, and I've found similar but not the exact symptoms, so I'm hoping someone can tell me if I'm thinking right on this. I don't hear any loud knocking, so I don't think the lifters are a problem. The vehicle has around 175,000 miles. 1) Replace upstream oxygen sensor 2) Check the fuel pressure and possibly replace the fuel pump 3)
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