I replaced the 4WD aucator though using the DYI on here it was easy. BUt now when I push the button it engages but the light keeps flashing the whole time. I engaged it one time for like 20-25 minutes in a heavy down pour and it keep flashing the whole time and I could fee that the 4wd was ingaged. ANd when I try and engage te 4wd auto it doent work it will flash for a few minutes then ingage back to 2wd. Anyone have an idea what it could be? And I was curious where the crank position sensor is at also on my blazer? Thanks

 

Can anyone help me with these problems?

 

Crank Position Sensor Location

About your 4wd issue... Well, if you have Auto4wd, you have to have a tech2 or equivalently optioned scan tool to read the TCCM codes. If you do not have Auto4wd, then you can read the TCCM codes by following the directions in the DIY article: OBD2 Non-Automatic Transfer Case Diagnostics