Engine knocking on cold start-3200 mile truck
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So a follow up and my fix. I found in online searches the live data to look at on a scan tool to verify the fuel tank pressure sensor was working. It showed an spec number towards the lower end of the rang, but in spec. Then while it was running opened the gas cap and the pressure should change. It didn't change even a tiny bit. The data for the purge valve said it was open...never changed. So then I measured the voltages on the plug for the fuel pressure sensor and they matched what it should be. So local car quest parts had the sensor in stock...it was a bit of a pain to remove and an even bigger one to get it to actually go back in. It helped to unbolt the driveshaft and bungie cord away from the gas tank to give a bit more room to work. So fuel tank pressure sensor in I cleared the code, and started it up. I went to the scan tool's live data and... Eureka! The pressure number was different and fluctuated a bit. So took it on a short drive and pressure number varied saw the purge valve go from closed to open and back to closed. Drove it to and from work for roughly a week plugged in the scan tool no codes. I took it in to get tested and passed. In my state's infinite wisdom (oops meant greed), since I pushed the test with the maximum extensions I have to take it back in by Feb '27 to 'get it back up to date', then my next test won't be until Feb '29. -
Any grease on the stud threads of any kind? Wheel studs should have NOTHING on them for proper torquing and so the nuts don't back off. Are all of the mating surfaces clean? So wheel, rotor and hub? We've had plenty of trucks at work with that wheel, this is a first to me. Makes me think they've got a lube tech putting anti-seize on all the wheel studs or some kind of grease, and they need to stop doing that. To have 11 other trucks with the same exact problem. -
I was a Chevy guy for years, then switched to GMC because I liked the looks better. I'm actually thinking I like the Chevy looks better than GMC for the first time in a lot of years. One thing I know for certain, the new GMC dash is hideous! Chevy wins this one! -
I didn't see that model on the list, had to go in to see that the Trail Boss was an option for the LT. $7600 upgrade. -
Ya know...you just need a VIN from a truck that has what you are trying to do... cars.com, autotrader, etc. Find an LT Trail Boss or LTZ, copy the VIN and finding the parts will be much easier.
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