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Old 04-01-2013, 04:46 PM   #31
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How would I go about checking the injector and injector harness with a volt meter? What current and ohm reading should I get?

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Old 04-02-2013, 09:31 AM   #32
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I swapped the 1 and 2 injectors with the 5 and 6 injectors and cleared the codes yesterday so we'll see what happens. I'm really wanting to code to follow the injectors so that I have to reason to replace them all with the upgrades.

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Old 04-03-2013, 05:55 PM   #33
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So the monitors finally reset today after almost 100 miles. Strangely enough the misfire codes and injector codes are gone (knock on wood) but the 1486 evap code remains. I read a post a guy made about how he got that code and lubed up the gas cap gasket with Vaseline and that took care of the code. Has anyone else had any experience with this code?
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Old 04-08-2013, 03:56 PM   #34
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Well hell.... I just checked my DTC's again and the cylinder 1 and 2 misfires are back but the 1 and 2 injector codes are gone. I need to get this fixed before the end of next month when my state inspection is due, unfortunately Houston requires emissions testing via the OBD port so it will fail....
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Old 04-08-2013, 04:02 PM   #35
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That the misfires didn't follow the injectors eliminates them as a possible cause so it was a good decision not to replace all the injectors as was prematurely suggested. Have you checked each cylinder's compression & looked for variances between the cylinders?
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Old 04-08-2013, 04:40 PM   #36
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I haven't done that yet. I guess I'll check that the next time I have some spare time. If that turns out well what would be the next step?

If the compression test checks out ok should I look into doing the valve springs? I've read a few posts by people saying they replaced them and it didn't help any.
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Old 04-08-2013, 04:59 PM   #37
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Similar/correct compression levels among all six cylinders would be a pretty good indication the valves & valve springs are ok. New correct model spark plugs right? Another member found his misfire to be caused by a defective E3 plug that had a pin hole in the ceramic insulation.
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Old 04-08-2013, 05:03 PM   #38
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Correct, I replace the spark plugs with the right ones. But I did go with the NGK iridium plugs, I've read a lot of people have luck with autolites? Could that help?
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Old 04-08-2013, 05:10 PM   #39
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NGK iridiums are very good plugs, as good as the Autolites, & I wouldn't replace them assuming they are the right model for the 4.0L engine.
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Old 04-19-2013, 06:01 PM   #40
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I just did a compression check today. And came up with:
Cylinder 1. 125
Cylinder 2. 110
Cylinder 3. 140
Cylinder 4. 145
Cylinder 5. 130
Cylinder 6. 180

It does look like cylinder 1 and 2 are a little lower than the rest, and cylinder is quite a bit higher. Can someone help me with the readings I got?
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Old 04-19-2013, 06:06 PM   #41
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I'd guess a valve job is in order if your engine isn't burning oil.
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Old 04-19-2013, 08:20 PM   #42
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Crap I was hoping I wouldn't have to do anything like that..... Alright thanks. Does anyone else have any helpful words about this?
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Old 04-19-2013, 11:31 PM   #43
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Quote:
Originally Posted by Jerry Bransford View Post
That the misfires didn't follow the injectors eliminates them as a possible cause so it was a good decision not to replace all the injectors as was prematurely suggested. Have you checked each cylinder's compression & looked for variances between the cylinders?
Not really. Look, I'm not saying that the problem is completely the injectors. Obviously OP needs a valve job like you suggested. I would venture a guess that the reason those valves are ate up is due to misfiring that has been taking place for some time. Doesn't sound like its the plugs, which doesn't leave much else to look at.

It is entirely possible that they are not the problem at all though. They are, however, a common weak link that if not functioning perfectly can manifest some problems like misfires. Shoot, even if you don't upgrade them at least clean them up real good so that you know they'll be flowing correctly before putting them back in and moving on to everything else under the sun. I think you just might be surprised.
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Old 04-23-2013, 06:50 AM   #44
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Are there any tests I can do to make sure it's in need of a valve job? Or is there anything I can do other than a full valve job, like the TSB?
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Old 04-28-2013, 11:08 PM   #45
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I depend on my jeep every day to get me to work and school so I can't be with out it for any time. So I've been trying to find an extra head to buy to send to the machine shop to get cleaned up and swap it out. Could I use a 4.0 head out of a 98' grand cherokee?
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Old 04-30-2013, 11:54 AM   #46
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Anyone?

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