Nissan - Titan :: 2007 - Lost Gas Mileage


Jan 16, 2015

I have a 2007 Titan that just turned 100,000 miles. Over the last 6 weeks or so I've noticed a huge drop in gas mileage. Used to get close to 400 miles a tank and now as of last night I got 248 miles on a tank. Average of 10 miles a gallon. Nothing has changed as far as driving habits or anything like that.

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I removed the intake manifold to get to the rear fuel injectors to see if they might be stuck open and leaking.The car had been sitting for about 5 days with the battery disconnected and when I removed the first injector there was no fuel in the injector or the rail and no pressure in the rail.I left the injector out overnight and the next morning there was fuel all over the top of the engine and in the fuel rail.I put the injector back in and unbolted the rail,I reconnected the battery and turned the key to start the fuel pump.I waited for about 3-4 minutes and did not see any fuel leaking from the injectors.I turned the key off and removed it from the ignition,disconnected the battery and bolted the fuel rail back down.I again removed one of the injectors and there was no fuel in the injector or the rail and no pressure in the rail.After about 2 minutes, with the key out of the ignition and the battery disconnected,I saw fuel start filling the rail and the injector port, so I quickly put the injector back in.

I`m thinking the next step would be to replace the fuel pressure regulator and recheck the injectors for leaks.Am I on the right track here with the pressure regulator? What could be causing the car to suddenly start acting this way, my daughter said the car ran fine on her way to work ( although I hardly think it could have been running "fine" with cracked coil packs,clogged air filter,worn plugs etc)...

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My local mechanic told me the computer was throwing a bunch of different codes, including the one for the catalytic converters. They also told me that since the problem seems electrical (the car seems to reset itself when I turn it off) it could be that the computer is going and that’s what needs to be replaced. I've taken the car back to the dealership where I bought it, they replaced the oxygen sensors, thinking that would fix the problem. I just got the car back yesterday and drove it for about 60 miles without any problems, then that check engine light came back on and the same old problem is back. My question is, how do I know if the problem is mechanical or electrical? What if I replace the catalytic converters when it’s actually the computer that was the problem all along or vice versa?

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Below are a couple pics of the weepage. Obviously not a huge leak, but something I want to get taken care of ASAP.

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I do make a couple 15 mile trips a week to the store, etc. I know I shouldn't be getting 30mpgs based on this, but does 16.5 seem low?

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Summer tires is Michelin primacy (about 2 seasons?) pumped to 3.0/2.8 bar (over inflated).

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Mileage went down over the weekend so I see a clear link.

It was more fun trying to hypermile at 56mpg aiming for 60 then it is at 42 aiming for 45...

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