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Old 12-12-2018, 05:30 PM   #1 (permalink)
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How read codes OBD 1?

Mopar efi conversion on 81 CJ. Stroked to 4.6. No CEL. Running like shit. Very hard stumble cold starts. Upon connection of scanner am asked for codes and VIN info. No help. Thus a dead end. Any hacks to get into the computer to read T codes? Weíve tried every mechanical trick to address timing issues but need to learn what computer sees.


Help a brother out please.
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Old 12-12-2018, 05:36 PM   #2 (permalink)
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Old 12-12-2018, 08:18 PM   #3 (permalink)
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Tnx. We are wits end. All this time, $ and busted knuckles and now this snag...
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Old 12-12-2018, 10:30 PM   #4 (permalink)
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Tnx. We are wits end. All this time, $ and busted knuckles and now this snag...
Hopefully he chimes in. He was the resident 4.0 swap expert on the now defunct cjoffroad.com

Edit: I’d send him a pm that might trigger him to come in here. He’s hit or miss.
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Old 12-13-2018, 05:11 AM   #5 (permalink)
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Check timing. Mine ran great for 2 weeks then all of a sudden ran like crap. Had it timed wrong. I had to cut the ears off the distributer and get alittle more twist on it. I guess with a aftermarket cam you need to do this. It would have been nice to know in the directions. I put almost another $1000 in chasing this problem. Because I knew I timed it right. Well I didn't. So check that.
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Old 12-13-2018, 05:14 AM   #6 (permalink)
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Old 12-13-2018, 05:50 AM   #7 (permalink)
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Requires a CEL, ainít got no...
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Old 12-13-2018, 07:44 AM   #8 (permalink)
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Requires a CEL, ainít got no...
Can you add one? May be your best bet.
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Old 12-13-2018, 12:28 PM   #9 (permalink)
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Can you add one? May be your best bet.
Or at least a test light off that wire.
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Old 12-15-2018, 07:41 AM   #10 (permalink)
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To get flash codes, you can connect a test light to the wire in the Hesco/Mopar harness that is there for the MIL. The wire color is black with a Pink tracer The PCM provides ground to this wire to turn on the bulb in the check engine light.

To pull codes, connect the test light to the wire and the other lead to the battery +. Cycle the ignition off to on three times with out starting the engine and leave it on the last time. The codes will flash on the test light or MIL. There will be a series of flashes, a short pause then another series of flashes for each code. About 4 seconds between codes.

Usually you will see code 12 (Battery disconnect) and Code 55 (End of codes). It will look like this: - --, ----- -----.

Not sure what scanner you are using to try to read codes. Usually, the controller used with the Mopar EFI is a '95 YJ controller. Most scan tools I've used only require the proper connector, power cable and the input of the model Jeep to be scanned. The Chrysler DRB-2 and DRB-3 will work with this system, as will the various Snap-On scanners with the proper connectors, cable and chip.

Hope this helps!
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