4 Wheel Drive/SUVs/Fuel injection

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Expert: - 1/21/2012


Question
QUESTION: I have a 1989 Nissan pathfinder, 3.0 V6 TBI does it have 1 or 2 fuel injectors

ANSWER: John,

The fuel injectors (2) are small solenoids that allow fuel to be injected into the intake manifold. They are contained in the throttle chamber. The injector receives a ground circuit from the ECU in terms of "Injection Duration". The voltage applied to the electrical windings pulls the needle valve up allowing fuel to flow through the nozzle.

WARNING: The positive circuit is always "Hot" at the injector terminals when the battery is connected.

Carl

---------- FOLLOW-UP ----------

QUESTION: Os it common for them to go put. I was going down the road and it started to bog down like I was out of gas now I cant get ot to start

Answer
O2 sensors do go out fairly often.  The problem is that when they do, they usually don't cause this problem.  This sounds more like a fuel pump problem, or a plugged/faulty catalytic converter.

I would have the fuel pressure and the catalytic converter tested.

Carl

4 Wheel Drive/SUVs

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Carl Brandt

Expertise

Will discuss suspensions, lifts, lockers along with tire suggestions. Trail ratings and possible requirements needed for specific type of trails. Safety equipment and what you should carry with you. Certified off-road instructor. I am not a mechanic, and 4-Wheeling is a hobby, so if I can't answer a technical question it is due to my mechanical knowledge being related to vehicles that I have owned, or have worked on. I do not have manuals on all vehicles.

Experience

40 plus years of 4 wheeling in a variety of vehicles. At the present time, my major off-road rig is a 94 Jeep Wrangler with a spring over and a 1 1/2" suspension lift. This gives me a total lift of 7" or so. I have lockers front and rear. I have removed the track bars, and sway bar for maximum articulation. I am running a stock 2.5 ltr 4 cylinder with a Jacobs ignition along with a cold air high flow filter. It has 4.56:1 gears with a Dodge NV4500 transmission along with a 3.8:1 Atlas II transfer case. This gives me a final ratio of 105:1 in low gear/low range. Other vehicles I own, are a 96 Ford F-250 with a 6" lift, posi rear end, 36" Hummer tires, 5 speed with a fuel injected 460 ci engine, an 87 Samurai with an 8" lift, Ford 9" rear end with a spool, Chevy Dana 44 front end with an electric locker, 5.88 gears, 16% reduction in high range and a 6.5:1 low range with 35" Baja Claws, and a stock 2003 Grand Cherokee Overland. Trails I have run are the Rubicon (10 times), Dusey Ershim, Fordyce Creek trail, McGrew trail, several trails in Moab, Utah along with local monthly runs.

Organizations
Lost Coast 4x4's Cal 4-Wheel Corva UFWDA Blue Ribbon Coalition

Education/Credentials
Certified off-road instructor - Certificates in engineering/electronics

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