Crank or Cam Sensor?
Thread Starter
Teching In
Joined: Jan 2012
Posts: 26
Likes: 2
Crank or Cam Sensor? Good afternoon All,
I’m having a bit of a problem with my LS1/T56 swap. It has happened twice now that the engine will miss and back fire for a minute or two and then just shut down. It did it yesterday, and I tried to collect as much data as possible. I noticed that when I lost power, the tach was still reading RPM. So, that leads me to believe it’s not the cam sensor. I pulled to the side of the road and tried to restart it… crank but no fire. The strange part is that after I stopped on the side of the road, I popped the hood and prodded the cam sensor connector (since I couldn’t reach the crank sensor), and it fired right back up.
Then last night when I went to pull it into the garage, it wouldn’t fire. So, I popped the hood and poked the cam sensor again. And, again, it fired right up. Weird…
I have HP Tuners and would consider myself fairly competent. I just don’t get the correlation between the cam sensor and the misfire/no fire thing. I thought the LS engines used the reluctor ring on the crank for ignition timing?
Any insight or advice would be greatly appreciated.
I’m having a bit of a problem with my LS1/T56 swap. It has happened twice now that the engine will miss and back fire for a minute or two and then just shut down. It did it yesterday, and I tried to collect as much data as possible. I noticed that when I lost power, the tach was still reading RPM. So, that leads me to believe it’s not the cam sensor. I pulled to the side of the road and tried to restart it… crank but no fire. The strange part is that after I stopped on the side of the road, I popped the hood and prodded the cam sensor connector (since I couldn’t reach the crank sensor), and it fired right back up.
Then last night when I went to pull it into the garage, it wouldn’t fire. So, I popped the hood and poked the cam sensor again. And, again, it fired right up. Weird…
I have HP Tuners and would consider myself fairly competent. I just don’t get the correlation between the cam sensor and the misfire/no fire thing. I thought the LS engines used the reluctor ring on the crank for ignition timing?
Any insight or advice would be greatly appreciated.
Thread Starter
Teching In
Joined: Jan 2012
Posts: 26
Likes: 2
I think I have a lead. I did some more reading last night on symptoms, and it looks like it would be the crank position sensor. I was pretty careful when I routed my wires during the swap, but it's entirely possible that I have something strained or chafing. Moving the wire harness near the camshaft position sensor may have been enough to make or break contact wherever the problem lies with the crank position sensor harness.
