I'll be up front, I've been having intermittent error codes for a while now. I'd fiddle with th engine and they would go away till they came back again. This became more and more frequent as time passed. I was getting not one but three Code 27's. That's the error code for fuel injectors. So if I was to believe the code, I had at least two injectors fail. When one goes, you don't really notice it. When two go, you get a rough idle and a loss in power.
<![CDATA[<a href="https://www.youtube.com/v/om2MuqV1nPU" target="_blank" rel="noopener noreferrer" class="bbc_link bbc_flash_disabled new_win">https://www.youtube.com/v/om2MuqV1nPU</a>]]>If you didn't know already, the 2.5L can idle on 2 cylinders. If you've ever change the distributor cap and forgot which way the rotor went, you would have experienced this first hand. (It's 1324 not 1234.) The engine will fall on it's face if you try to drive but it's good to keep that in mind when diagnosing problems.
So, I've had to replace my injectors a few times over the years since swapping to the Ford's. The first were the Design II's. Then a few years later I had one fail and so I went with Design III's. Since I bought 8 this time, I went through two sets in about 8 years. The stock Denso's always worked as backups. This time I decided to take a look at what's new. I also wanted to buy new injectors since all of the other sets were take-outs off ebay.
If you do a search on Google, you'll see fiveomotorsport.com. They were one of the first to cater to Jeeps and other vehicles with non-OEM options. They listed the Design II's as well as the Design III's but also showed a new Bosch that was supposed to be an upgrade to teh Design III's. They have the same 4-jets and the plastic body like the Design III's. They're even the same 19psi/hr @ 43.5psi. The most noticable difference is that they're black. I'm assuming the others are Ford spec while these are more generic Bosch's.
If you haven't taken injectors out, It's not a big deal. There are 2 10mm bolts and 2 10mm nuts holding the throttle cable bracket and a sensor to the fuel rail. Under the two nuts are two more bolts that are 13mm (I think). Once those are out the rrail can come out. I'd also advise disconnecting the CCV tube and the vacuum on the front of the fuel rail.
If you're still using the stock injectors then you'll have those small metal clips holding the injectors on. The Bosch/Ford injectors don't use those. In all honesty, they are necessary. The injectors are a tight fit and won't fall out. They are more of a factory fail safe when putting the engines together then anything else.
Be sure to use some silicone grease on the o-rings. It will help keep the o-rings from tearing and make installing them much more pleasant.
