Hard to say for sure. If it is the coil pack it will for sure trip the code on cylinder 1 when it does fail again. Otherwise you still have the spark plug, the wire or the fuel injector that could be it too. That is, if it's not a lifter problem but usually once a lifter fails it's failed forever because they stay collapsed.
1. Not sure on that one, wonder if that is listed in the owners manual though. 2. From a legal standpoint, no you can't. If you got caught by a sheriff/DOT officer and they actually went through everything, you could be fined for towing more than allowed by the truck. Also if there were factory parts that you could buy to get the max towing allowed for a truck with your engine/transmission, the GM dealer is not going to re-program your truck for those changes or give you a new door sticker with new ratings. 3. It's all about looks. 4. I guess that depends on what you are looking for. Lots of interior and exterior stuff you can buy but many of the performance based stuff is down to a handful of stuff. More for the V8 trucks than the Turbo 4 Cylinder truck. GM made it far more difficult to mod these new truck so it's either taking much longer to produce parts or the people that make the stuff just don't plan to do it because R&D costs are too high.
Maybe? I only replaced the plugs on my truck at 96,000ish miles and reused the stock wires because they are some of the best OEM wires out there. My truck is a 2016 and has 117,000 miles on it now. Seen OEM wires last well over 150k miles without issue too. It wouldn't hurt that's for sure, so for the $100 it costs to do the work it may be worth the peace of mind.
Pretty much nothing is different, it's all carry over parts on the LTD's. I could only assume that aftermarket plug in programmers for a 2021 work on a LTD 2022. Best to contact whatever company that makes the parts to double check.
Ease of use if you ask me. One touch drop instead of hitting all 4 switches. I'd use it in the summer months to get the heat out quickly. I always use my key fob to roll all 4 of windows down while I walk up to my truck when I leave work.
It will run worse. 85% ethanol requires roughly 30% more fuel all the time to run like it would on regular fuel. The computers can only compensate so much if you did pump it full of E85. Usually it will start worse, use much more fuel than normal and under heavy throttle it will run lean because it can't put enough fuel in. Plus most OEM's don't give a lot of headroom on stock non flex fuel injectors or fuel pumps. Like for example a 2004 Silverado 5.3 with non flex fuel injectors doesn't have 30% more headroom to run that fuel.
Are you talking about physically removing all the parts or just wanting to install a AFM/DoD device that turns it off. One is many thousands of dollars to do and the other only costs like $150. If you removed all the parts, it would have to be re-tuned by a shop and they would have to turn off all the error codes that come with that. The cheaper plug in device should never cause a check engine light.
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