A while ago, my 2010 3.0 V6 threw a random cylinder misfire code. I cleared it and never had any more codes for a few months, during which in the cold months, while coming to a stop, the rpms would drop below 500 and almost stall out, but once it got warm enough it was fine.

today it threw a P0174 code, which in doing some searching, and because of the previous misfire, what are the chances at 110,000km (68,350 mi) that plus would maybe be the issue? I’m going to check the MAF sensor readings, and I do plan on buying some carb cleaner to check for vacuum leaks, but just wondering if plugs are likely culprits.

 

Dumped a bottle of injector cleaner in the half tank of gas. While checking for vacuum leaks and reading sensors, the code cleared itself. So guess dirty injectors were the culprit, but I’m still curious when people are changing plugs now a days?

 

I bought my v6 Outlander used w/ 140k miles a couple of years ago and had a pending P0174 code come and go a few times usually in colder weather. The code status was pending as it didn't illuminate the check engine light, but I always have an obd2 device connected so it notifies of any codes, pending or not. My car never stalled, but the acceleration was slightly sluggish until the pending code went away on its own soon after. I pulled the front 3 spark plugs and it looked original so I decided to change them out. During this time I also cleaned the MAF with MAF cleaner and wiped down the throttle body while the intake was off. This was done about 8 months ago and the pending code occurred just once since then.

Have you had a chance to pull the plugs to check the condition? Unfortunately the bank 2 plugs are at the rear under the intake manifold, but I'm sure the easily accessible front plugs will probably show the condition.