Cold start

Raptordude · June 9, 2016

About a month ago, my crank position sensor quit on me and left me sit. After popping a new one in, it seems like it is taking a little longer to start up on a cold start. I mean it doesn't take long, but it used to be instant. Now it cranks for just a little bit before starting. On a cold start I always let the fuel pump prime, and I just replaced the battery about a month ago. Any ideas? I'm not saying anything is wrong, just wondering what may have caused this.

Sent from my iPhone using Tapatalk

Colossus · June 10, 2016

Is it a Delco branded sensor that you replaced it with? Also how old is the vehicle battery?

Raptordude · June 10, 2016

No I did not get the AC delco crank position sensor. The battery is only 3-4 weeks old

Sent from my iPhone using Tapatalk

Colossus · June 10, 2016

Ok. My thinking on this is that different branded crank sensors will have different parameters in which they measure, which will in turn result in a different reading being sent to the ECM and thus the longer (or sometimes shorter) crank cycle, depending upon the model of the sensor. Is it just a half a second longer or drastically longer cranking? If it's not too long I wouldn't be worried. The old 4.0L inline 6 that was famous in the Jeeps from the 80s and 90s would crank for almost 3 full seconds, sometimes longer. And then there was my 99 Silverado which would only need 1 second every time. Except for when the battery got low or worn out.