Hi everyone. I lurk on this forum from time to time since I own a 2006, 4.0 L Frontier and am usually on the other Nissan forum. I posted this problem on the Frontier forum but got no answers. Hopefully, you all will have some input. I purchased a Bullydog and, before setting it up for a download, I noticed that my timing was at -33 deg. (supposed to be 15-17 BTDC). I am at a loss as to what is causing this. I have checked all over for vacuum leaks and find none. I recently had the ECM relay replaced but do not think that would throw the timing off this much. The truck runs fine which tells me that the ECM is covering the problem. No codes at all. I unhooked the battery for an hour to see if the reset would take care of it. No luck.
If anyone has an idea, please chime in. All ideas will be much appreciated. Thanks in advance.