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Followup To
Question -
Well I have some good news, problem solved after looking into Air Filter,Plugs,Fuel pump, fuel filter, sensors,distibutor,wires,etc....the problem was when my fuel sensing unit was reinstalled after a wire repair the Mech used silicone to seal the unit, the reaction in the tank plugged up the fiklter sock to the fuel pump. SILICONE AND GAS MAKE AN UGLY MESS - HOPE THIS ONE HELPS SOMEONE DOWN THE ROAD
Below is an answer you provided, I a m having a similar problem - do you know what the outcome was, my problem is similar, as the car warms up the problem gets worse, to the point of backfire and only 40 km per hour speed
Question
I have a 1995 Nissan Pathfinder. It loses power even if you are going fast. I have also noticed that it doesn't seem to lose power as quickly in the morning as it does after it has been driven. I have replaced all spark plugs and spark plug wires, the mass air flow sensor, fuel filter, fuel pump and distributor cap. I have been told that I need a new fuel pump, but I think it may have something to do with the wiring. Have you heard of this problem with this vehicle and has any of the wiring had to be replaced. I am looking for the most economical way to diagnose and fix this problem. Thank you in advance for your help.
Answer
Ken,
First I would check the fuel pressure to see if it drops off when you are driving and the vehicle looses power. If the pressure goes down with the power then you know it is a fuel pump. I recommend dealer fuel pumps as I have had trouble with aftermarket units. If the pressure is fine I would be lloking at the dirstibutor for the optical pickup being contaminated with oil or the coil is failing. You can check the coil for output when it is cold, in the morning and after the vehicle has been run. If the readings are different then the coil is defective and the windings are failing.
Answer -
Kelvin,
I did not get a blow by blow response to the answer. But, they did rate me highly on the survey. Now, if I were you I would do the tuneup and make sure the air filter was good and the plugs were changed along with the fuel filter. Lastly, check all the vacuum lines to see that none are defective. You are not showing a code are you?
AnswerKelvin,
That would have been hard to tell that anyone would be boneheaded enough to use silicone to seal the pump. The instructions are quite specific on what to use for the task. Yes, silicone and gas do not mix well. Also, here is one for you that I found. Nissan does not recommend fuel additive. A friend used fuel additive for performance and ended up melting the injectors and fuel pump and had to have them all replaced. Just use a good quality gasoline I suppose?
