Hello all, I have had an ongoing issue with my Pathfinder losing power from pulling timing under load once the engine hits about 3000rpm. I had a faulty knock sensor which tripped a code so I replaced that the hard way and the code has not shown back up. I've hooked it up to a autel and watched it bump the timing from 30* to 60* as soon as it hits that 3000rpm threshold. I've cleaned the stuffings out of the MAF sensor and have new plugs, wires, distributor cap and rotor. After getting everything back together I now have a P1105 code for the map sensor solenoid which I will be looking into. Any ideas? I'm at a bit of a loss.

The P1105 code is fairly common on these vehicles. There is a good article on how to test this here:

http://www.checkenginetroublecode.com/p ... ap-sensor/

I have replaced a few of what they describe as the "Baro Sensor" in the article due to sticking (I've always referred to it as the MAP/BARO solenoid valve). I would address this issue first as it can cause sluggish performance/lack of power.

Once that is done, I would check the ignition timing using a timing light. Warm up the engine and make sure the coolant gauge needle is around the middle (if it is too low, you may have a stuck open thermostat). Run the engine between 2000-3000 RPM for about two minutes. Let idle and turn off the engine. Unplug the harness connector on the throttle position sensor and re-start the engine. Rev the engine a few times and let idle. This will put the ECM into timing set mode. Check and adjust the timing, as necessary, with a timing light. Adjust the base idle to spec. Shut off the engine, plug the TPS back in and you're done. Hope this helps.

Thanks for the advice, I'll definitely look into the sensor when I get a chance after the holidays. The thermostat isn't an issue as it warms up quickly and stays consistent with the temp. The fast idle circuit is the only other wonky thing.