I have recently gotten my 1997 Jeep Grand Cherokee Limited 4.0L 2wd running again, after a period of time which lasted around 6 to 8 months. By the time I got it running again, I had replaced a lot of parts. However, I work on small engines a lot on the side (I am a plumber by trade), and every time I work on one, it's almost always the case that the carb needs to be cleaned and re-built, due to the nature of the ethanol blended fuel that we use these days. It always gets all gummed up in everything. The smaller the inlets and outlets, the more it presents a problem. So, seeing as I've replaced the PCM, the fuel pump (carquest premium with limited lifetime warranty), both O2 sensors (Denso Upstream and NGK Downstream), the TPS (NGK), the IACV (duralast gold), the CPS (NGK), the distributor cap, rotor, spark plug wires and spark plugs (an ACCEL ignition tune up kit, so all ACCEL parts here), an ignition coil (duralast gold), and I'm fairly certain there are a few parts/components which I am not thinking of off the top of my head, which have also been replaced. It's running now. I can start it, and it will run continuously, without stalling. I can drive it. Although it always runs perfect for the first 10 minutes or so, and then, it will intermittently begin to misfire. But the thing is, I can't tell if this is because it's not getting fuel to a cylinder, or if it's because it's getting too much fuel to a cylinder. It doesn't run nearly as rough as it originally did, ever since I changed out the initial crappy ignition components I had used just trying to keep things on the cheap, and the upstream O2 sensor.

At any rate, I do pull ONE code still, which is a P1391 "iterm loss of CMP or CKP". I never get a check engine light to illuminate, but I know the PCM is still okay, because I never ever lose my fuel level gauge or my voltage gauge like I did before I had replaced the PCM (which was what needed to be replaced in order for me to get it not just turning over again, but started and running). Additionally, at this point, I have also gone through the vehicle and removed all my grounds and got those areas and components taken apart, cleaned up (both the mounting surfaces, and the grounds themselves) and put back together, and I have a battery that is new enough that I know it's not the problem (also, I have a battery maintainer which I have used to check my battery and alternator, both of which read fine. And the battery, I kept disconnected while the Jeep was not drivable) Any time I work on the Jeep, I remove the negative battery cable, and make sure to leave it disconnected for at least an hour or so, before I re-connect it to take off and drive it.

In a nutshell, I have decided that since I have done all this other work, that I might as well go on and replace the fuel injectors as well. So, I am wondering if, like so many of the other parts on a Jeep, if the injectors are a sensitive case as well, to where its best to buy a certain brand or type? And if so, what is that brand or type. Thanks in advance to anyone who can offer some suggestions. Oh, and lastly, I am down to buy what's best for the Jeep, but I am hoping that there is some option out there that maybe isn't the most expensive part available. If that is what I have to do, its what I have to do, but I would much prefer if there were a reasonable priced version of the part out there that I could purchase.

 

contact a fellow member here. Trevor trevor.skankfootracing@gmail.com

 

Cool, thanks a lot. I really appreciate the contact info. I already shot him a quick email, basically asking the same thing as I did right here, so I'll check my email here and there, and hopefully hear something from him at some point in time. I appreciate your time and consideration.

 

https://precisionautoinjectors.com/c...fuel-injectors I know several people who have bought from them and have been happy

 

Another option is to have yours cleaned an tested. The shop will test for correct spray and volume and a new filter screen. The last set I had done was about 130 dollars. It improved the idle .

Ron