The fuel injectors can develop leaks on some models, causing the engine to run poorly or to become less fuel efficient.Google+
Car Problem Reports
Nissan Maxima Fuel Injectors May Leak and Cause Engine/Fuel Problems
Nissan Maxima Problem
Engines Affected: 3.0L V6 DOHC, 3.0L V6 SOHC
Average Mileage: 164,071 mi (100,000 mi - 196,000 mi)
Visitor, 1990 Nissan Maxima, 3.0L V6 SOHC, 160,000 mi
Car suddenly began misfiring and jerking. I limped to a well known repair shop in my expensive town and the diagnosis was that the fuel injectors were shot. The repair estimate was $2,275 including $200 for each of the 6 injectors (new parts). The car is worth about $750 per Edmunds. I had it towed to a very reputable shop in the next town where real people live and shop. They were willing to use rebuilt fuel injectors, but said we had to replace deteriorated cables, hoses, gaskets as well. However, the cost with rebuilt injectors was under $900. So while they had the car I opted to have the brakes replaced and some hoses, so total cost with tax was about $1,400. More than I wanted to spend, but less than a down payment on a newer car--and no monthly payments. Hopefully, I will get one more year (and a little more economic recovery) out of this car.
Visitor, 1994 Nissan Maxima, 3.0L V6 DOHC, 193,500 mi
Everytime I change an injector; car runs great then same problem within hours.
My Maxima developed a bad fuel leak, the check engine light came on, and the car ran rough. The mechanic recommended replacing all 6 fuel injectors.
Visitor, 1991 Nissan Maxima, 3.0L V6 SOHC, 196,000 mi
fuel line clamps leaking can not get to them on the way there put in.