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2001ZR2 Crank Sensor Relearn

Old 01-05-2019, 12:05 AM
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Default 2001ZR2 Crank Sensor Relearn

Heres the deal. I replaced the crank sensor and did not do a relearn. It was running so good I didnít think I needed too. It ran really well around town and an occasional one hour trip. I had one code a Po303 random misfire code. I felt nothing. Ran real well.
Now today I left Georgia heading to Ohio. Truck ran very well until about 300 miles. Every time Iíd go up a big hill the trans would kick down and start to loose power. The tach would go crazy!! Finally it just had no power at all so I pulled it over. I had my code scanner with me so I plugged it in and got 9 codes. From p0101 to egr to random misfire to p404, P1870,P0741P0335. Well you get my point. I cleared all the codes and the truck then ran real well again. Ran it like that for another 100 miles then it lost power again with a couple of the same codes. Cleared them and it ran well again. Almost to Ohio and I stopped again and cleared another couple codes and yes ran well all the way to my destination. Itís a 2001 ZR2 4.3. By the way I averaged 16 miles to the gallon!! Do you think a crank sensor relearn will fix this? Sounds to me like the crank sensor is messing with the computer. Please help. Thanks.
Old 01-11-2019, 05:06 PM
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I think if they recommend doing it when you change the part, then theres no harm done... probably better off anyways.
Old 01-14-2019, 09:07 AM
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I had an issue with my Tach going crazy, especially when it was over 3k RPM. Sounds like yours is doing the same. I put a shim on the Crank Position Sensor and have not had problems since. Did you get shims in your replacement crank sensor? If you did, did you install them?
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