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Coil 6 Insufficient Ionization, Multiple Cylinder Misfire, Fuel Injector 4 Circut/Open
Sorry about the delay... No smoke is very, very good. PCVs are only 1 of several contributing factors that influence how the ECM/PCM tells your jets and coils to combust fuel. PCVs only have a recommended replacement cycle of 30K. If they get clogged up, it affects fuel:air mix, which gets...- dtennes
- Post #18
- Forum: KJ General Discussion
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2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code
I'm still struggling through this... Are you experiencing 1 cylinder or multiple? Is it always the same one (which?) and is there any apparent pattern/frequency?- dtennes
- Post #50
- Forum: KJ General Discussion
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Coil 6 Insufficient Ionization, Multiple Cylinder Misfire, Fuel Injector 4 Circut/Open
Have you got any smoke at all coming out of the tailpipe? If "yes", STOP DRIVING IMMEDIATELY. That was the precursor to a blown ring. Smoke messes up the catalytic converters (min $1500 for a complete new exhaust system because that junk cakes up in the pipes and finds its way downstream)...- dtennes
- Post #6
- Forum: KJ General Discussion
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How to rebuild and install a wiring harness for either fuel injectors of ignition coils
This is a work in progress and content will accumulate over the next few days...- dtennes
- Post #2
- Forum: KJ General Discussion
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How to rebuild and install a wiring harness for either fuel injectors of ignition coils
This thread is an education in how to rebuild complete wire harnesses for complete KJ fuel injector and ignition coil circuits. In hindsight, this was actually a very simple effort after subtracting out a lot of trial and error. What follows is the streamlined "How To" broken out into 8...- dtennes
- Thread
- Replies: 5
- Forum: KJ General Discussion
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2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code
Update: Successful fabrication, installation, and testing of complete replacements for ignition coil harness and fuel injector harness for all 6 cylinders. I still have that rogue cylinder 4 misfire, but I now have absolute confidence that the problem is not related to either fuel injector or...- dtennes
- Post #47
- Forum: KJ General Discussion
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2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code
Regarding the electrical connectors used in the various Liberty models (regardless of year), you have to be very careful about terminal pin designs, seal sizes, weatherproof plugs, etc. I got set back a cumulative 2 weeks because I didn't match female terminal to connector housings properly...- dtennes
- Post #46
- Forum: KJ General Discussion
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2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code
Wiring bypass progress update: I literally woke up in the middle of the night with a nagging suspicion that I should go back and check which PDC (power distro center) wires I had identified to be in the two circuits. With a dose of embarassment, I must report that I tried to splice in the Fuel...- dtennes
- Post #45
- Forum: KJ General Discussion
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2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code
There is no capacitor required/used with the 3.7L. - I scoured the Service Manual text, reviewed all wiring schematics multiple times. - There is a capacitor for the 2.4L... *but not for the 3.7L*.- dtennes
- Post #44
- Forum: KJ General Discussion
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How Do I test PCM signals to Coil Pack 5/2?
Did you ever solve the problem? -
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2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code
I still get the misfire code p0304. However, while I was waiting for components to ship I really started to read up on how the PCM thinks in the Jeep KJ Service manual (which can be found on this site). The very last chapter in the manual is all about Emissions Control and how the PCM goes...- dtennes
- Post #43
- Forum: KJ General Discussion
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2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code
Recap after 5 weeks of effort. I figured I would create a new bypass harness from the PCM to all fuel injectors and ignition coils. I only have a misfire problem on cylinder 4, but the thought was, if I gotta bypass one cylinder I might as well do all six. Unless you are an electrical...- dtennes
- Post #42
- Forum: KJ General Discussion
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2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code
@DadOSix, thanks for the encouragement!- dtennes
- Post #41
- Forum: KJ General Discussion
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2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code
Outstanding! I have been worrying about whether or not to use splices because I've read about the effects of increased resistance. After discussions with various mechanics (and a Flagship1 ECU/PCM tech), my understanding is that when a coil fires some sort of "pulse"/"voltage change"/"other...- dtennes
- Post #39
- Forum: KJ General Discussion
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2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code
Thank you, this is very reassuring. Did you simply cut off the wires coming out of the ECM and the coil connector, and then splice new wires in between, or did you pull the terminals out of the connector and the corresponding ECM terminal cavities? How long ago did you do this, and are those...- dtennes
- Post #37
- Forum: KJ General Discussion
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2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code
Did you, or some shop mechanic, ever replace the connector for either the Ignition Coil or the Fuel Injector on cyl #2 ?- dtennes
- Post #36
- Forum: KJ General Discussion
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2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code
Hi LibertyTC- I'm in the process of assembling a How To guide for creating a simple custom plug-in harness to bypass the original circuitry for the ignition coils and fuel injectors for 2002-2003 (and possibly later models) of 3.7L KJs. Is that the kind of thing that should get parked out under...- dtennes
- Post #33
- Forum: KJ General Discussion
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2003 Liberty 3.7L sport, Reman engine from Tri-Star, p0304 code
>>>>>>> THIS IS A WORK IN PROGRESS <<<<<<< >>>>>>> DO NOT USE UNTIL I REMOVE THIS WARNING HEADER <<<<<<<<< >>>>>>> BECAUSE I CONTINUE TO FIND MORE EFFECTIVE/EFFICIENT/ELEGANT TACTICS FOR THE VARIOUS STEPS AS I PROCEED<<< >>>>>>> I WILL EDIT THE ATTACHED PART1.txt and PART2.txt FILES UNTIL THE...- dtennes
- Post #32
- Forum: KJ General Discussion
