I am thinking about getting a tune from nelson but seems like you have to do the crank relear alot on my year model. Exactly what is that and why do you have to do it? Will the truck run without doing it?
Printable View
I am thinking about getting a tune from nelson but seems like you have to do the crank relear alot on my year model. Exactly what is that and why do you have to do it? Will the truck run without doing it?
The Crankshaft Position (CKP) sensor sends pulses to the PCM as the reluctor wheel teeth rotate past the CKP sensor. The PCM uses the CKP pulses to synchronize the ignition and fuel injector operation, and to time the interval between each CKP pulse. The PCM determines when an excessive change in crankshaft speed occurs by comparing each new time interval with the previous interval. A misfire causes an unexpected change in the crankshaft speed. A certain amount of acceleration/deceleration is expected between each firing stroke, but if the crankshaft speed changes more than an expected amount, the PCM interprets this as a misfire. The interval between CKP sensor pulses is extremely small. At high engine speeds, slight variations in the following components make misfire detection difficult
And yes the truck will run just a little rough and you wont get the most out of your tune.
O.k. Thanks for the info. Can any dealership do the crank relearn?
Yea as long as they have a tech ll but it will cost 80 to 90 bucks for a 5 min job. Yea Ino stupid. if you have a bud with efilive he could do it for you for free.
any garage with a snap on mt2500 or a otc genisys or similar can do the crank relearn.