Posted by oldtanker on September 16, 2012 at 07:57:54 from (66.228.255.239):
In Reply to: Truck mileage question? posted by Brett Helmkamp on September 15, 2012 at 18:22:17:
Unless you are buying the cheapest gas you can injector cleaning is a waste of money. The more expensive stations, BP, Holiday Ect put more additives in that keep the system clean. So an injector cleaning may be a waste of money. Jiffy lube can make all the promises in the world. You would have to be able to prove in court that your mileage didn't change. That may take more than your word. Besides most people who go for that are not going to admit to their friends that they were took. THIS IS NOT SAYING AN INJECTOR CLEANING WILL NOT HELP. It can but it's a coin toss.
One thing that can cause bad mileage that many people overlook is fuel pressure. Your injector is supposed to spray in a cone shape pattern. When the filter is plugged or the pump is getting weak the injector doesn't spray right causing a poor mixture in the combustion chamber.
So basically where you are at now is trouble shoot the problem. It's a computer controled engine. You can throw a lot of money at it before you find the problem. Take it in and have it run on the computer. If you know it's due plugs and an air filter try that it's needed anyway. But don't just start thowing parts at it.
Look up air filter and the air filter guy. According to sever reviews I've read on air filters lately the reason the K&N filter gives you more power is because it allows more stuff to pass through the filter. That translates into more upper engine wear. Face it. To make more power with just an air filter change you have to flow more air. Only 2 ways to do that. Make the filter bigger with more surface area or make in to where the media surface pores are larger allowing more air to flow. The 2nd option allows you to used the same size filter but also allows more dirt to get past the filter.
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