Crank and cam position sensors
Crank and cam position sensors Got my motor fired up and car running after my rebuild. The entire motor was torn down and pretty much every internal is either new or else a newer used part.
My question is my machinist told me I would have to do some sort of "relearn" on the crank and cam position sensors since everything was changed. When I was doing some breaking in I did notice that my car was running pretty rich and when I went above 3.5-4k RPMs or so the car would sort of sputter and pop. I checked the plug wires and everything seemed to be okay. Would the sensors cause something like this to happen?
The pistons are -9.6cc dished so I thought maybe that without a tune lowering the compression would possibly cause a rich condition as well. The car seems to run and drive alright aside from those occasional hiccups at higher RPMs.
Any ideas from anyone? I figure enough people around here have done rebuilds before that someone would know if this sort of thing is normal before tuning or not.
My question is my machinist told me I would have to do some sort of "relearn" on the crank and cam position sensors since everything was changed. When I was doing some breaking in I did notice that my car was running pretty rich and when I went above 3.5-4k RPMs or so the car would sort of sputter and pop. I checked the plug wires and everything seemed to be okay. Would the sensors cause something like this to happen?
The pistons are -9.6cc dished so I thought maybe that without a tune lowering the compression would possibly cause a rich condition as well. The car seems to run and drive alright aside from those occasional hiccups at higher RPMs.
Any ideas from anyone? I figure enough people around here have done rebuilds before that someone would know if this sort of thing is normal before tuning or not.
Yes, I would say you most definitely need to do a crank relearn procedure. I'm pretty sure you need a Tech 2 scanner from GM but it is a very simple process to do. I bet the dealer wouldn't charge much to do it for you.
Joined: Aug 2007
Posts: 24,241
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From: Turnin' Wrenches Infractions: 005
Before I did anything, I would have someone ride along (or dyno) and have a look at the tune with a wide band. There is no telling what's going on until you start reading some live data.
