2000 Jeep Wrangler - 2.5L Eng Swap P1391?

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CAPLES CAR CARE
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2000 Jeep Wrangler - 2.5L Eng Swap P1391?

Post by CAPLES CAR CARE »

WE PUT A NEW ENGINE IN THIS JEEP AND NOW HAVE CODE P1391. WE REPLACED DIST, CRANK SENSOR, FLYWHEEL AND SET EVERYTHING BY THE BOOK. WE USED DEALER PARTS AND STILL HAVE THE CODE. WIGGLE TEST DOES NOTHING. MODIS SHOWS GOOD WAVE FORM ON BOTH CAM AND CRANK SIGNAL. HAS ANYONE ELSE COME ACROSS THIS BEFORE.
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ricmorin
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Re: 2000 jeep wrangler 2.5 p1391

Post by ricmorin »

Welcome to the Forum.

I doubt you're going to catch this glitch with a Modis. That Modis data is processed by the PCM. You need a true scope and backprobing at the PCM to see this. When you do this, you'll need to scope both so you can see the relation between the two signals.

Also make sure you have the dist in correctly. On some models, you need to grind the locating tabs so a very minor adjustment can be made to sync these properly. Usually happens when a new engine is installed.
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Re: 2000 jeep wrangler 2.5 p1391

Post by CAPLES CAR CARE »

We did use the scope and back probe the cam and crank sensors at the sensor connections and the modis showed that they were in sync in the pid data. How do you know if the dist needs to be adjusted slightly?
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Re: 2000 jeep wrangler 2.5 p1391

Post by ricmorin »

If you superimpose the two signals, you can see if they're are correlated or not. The other way is to have a sacrificial cap and drill a hole where number one goes and align everything and see if it points EXACTLY to number one. If it doesn't, grind the tabs so you can get a little adjustment. Don't need much.
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Re: 2000 Jeep Wrangler - 2.5L Eng Swap P1391?

Post by CAPLES CAR CARE »

The code went away when we put the dist. in with the center of the rotor button 1 tooth past cyl #1 towards #3. Thanks for the help.
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