Well hi everyone
I am having a problem and I need a bit of help with it. I have a 2004 trailblazer with a 4.2 in it and I spun a rod bearing. I destroyed the crank so I found a new one that was in good shape it was from a 2007. I rebuilt the engine and got it all back together. And like so many other on this forum I got the check engine light and the code reader said it was crank and cam miss match. I knew I rebuild the engine right so I figured it needed crank sensor relearn so I took it to the dealer and they tried to do the relearn well that didn’t work and the tech told me it had to be internal timing so I took it home and took it apart again I tdc’ed the #1 cylinder with a plunge micrometer and it was right on and 0/0 then I used a cam tool and held the cam flats perfectly strait then I aligned the cam sprockets on the darkened links and the exhaust actuator was advance as directed by the shop manual. So with that said the engine timing is right on and a second trip to the dealer still won’t reset the code I looked up the part #’s for the crank and they are different I am hoping that GM didn’t change the reluctor wheel spec’s throwing off the hole system. I do know that the flex plate bolts are different so be aware of that. If anyone has a suggestion I am up for it , and if anyone knows if the crank is different please let me know
it has been seven months I have worked on this thing and I am about to buy a junk yard motor and waste all the upgrades like clevite 77 steel backed road bearings.
Thanks
I am having a problem and I need a bit of help with it. I have a 2004 trailblazer with a 4.2 in it and I spun a rod bearing. I destroyed the crank so I found a new one that was in good shape it was from a 2007. I rebuilt the engine and got it all back together. And like so many other on this forum I got the check engine light and the code reader said it was crank and cam miss match. I knew I rebuild the engine right so I figured it needed crank sensor relearn so I took it to the dealer and they tried to do the relearn well that didn’t work and the tech told me it had to be internal timing so I took it home and took it apart again I tdc’ed the #1 cylinder with a plunge micrometer and it was right on and 0/0 then I used a cam tool and held the cam flats perfectly strait then I aligned the cam sprockets on the darkened links and the exhaust actuator was advance as directed by the shop manual. So with that said the engine timing is right on and a second trip to the dealer still won’t reset the code I looked up the part #’s for the crank and they are different I am hoping that GM didn’t change the reluctor wheel spec’s throwing off the hole system. I do know that the flex plate bolts are different so be aware of that. If anyone has a suggestion I am up for it , and if anyone knows if the crank is different please let me know
it has been seven months I have worked on this thing and I am about to buy a junk yard motor and waste all the upgrades like clevite 77 steel backed road bearings.
Thanks