P1320 INFINITI Q45 - and P1105 TCS/slip indicators on dash rough idle intermittent replaced coils

Question

intermittent. Rough idle with tcs/slip lights on dash. restart and no problems at anytime it can just happen or not at all. since it is intermittent cant finger it out.runs great then idles like crap. codes are p1105 and p1320

Answer 1

The code P1320 Ignition Signal  (https://www.autocodes.com/p1320_infiniti.html). Usually the code is triggered when one or more of the ignition coils fail. The problem is finding out what coil is the one that fails. Since is hard to find the bad coil, some owners replace all coils to fix the problem.

The P1105 Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction (https://www.autocodes.com/p1105_infiniti.html) is not common, and could be caused by the ignition coils problem.