2000 Jeep Cherokee with the I6 engine has been really good to me overall, but as I get around to doing some much needed maintenance I'm running into more and more problems (things I've all but ignored). I just replaced my old worn out stock injector (single big hole) with some new injectors that sport 4 holes and the same flow rate as the stock ones but supposedly provide better fuel atomization (snake oil?). I noticed some deposits in my fuel rail that weren't fuel, but some collected rust that had moved it's way from the fuel tank to the rail ala worn out filter but just cleaned it up and went on my way. After installation of the new injectors, I drained the capacitors on my SUV and reset the computer so it could learn the new injectors. Mileage was pretty crappy for the first 50 miles or so, but it picked up suddenly after that by about 1.2 MPG (me watching the gauge, not any other real method of measurement). I stopped the vehicle for the night and during my trip the following morning, I threw a check engine light and ran the code to find it to be a missfire in cylender four. Granted this is one of the "catch all" codes for my vehicle so I went through the motions and checked (and changed) the spark plugs, checked the PCV and other vacuum hoses that were temporarily moved during the installation. I begrudgingly pulled the fuel injectors and found a huge collection of sediment in the back of the injector and flowing in the rail. Basically my in-tank filterscreen is blown through. The engine will continue to throw that code whenever the engine is idling but it goes away while under power. Under power however, it is really lacking (basically it's running on default maps in limp mode). I'm not over advocating "seat of your pants power" but you can really tell a difference when your daily driver isn't behaving normally especially in a quick WOT 0-60 test. I've looked into the mess via online research, but either I drop the entire tank and skid (not happening short of pump failure) or I put in an inline filter to take care of the debris. I ordered a flomax 300
on Satruday and expect it to come in on Thursday. I'll take some pictures and post the installation on here.