Fuel filter?

Joined
23 November 2010
Messages
30
Location
Enterprise, Alabama
My NSX is sputtering under anything but WOT, so I'm thinking it may be the fuel filter. I just got the car three days ago and I can't find out where the damn thing is. I also ran lucas fuel treatment which isn't working. Please help!!
 
Could be 02 sensors. On each valve cover on the passenger side there is a four pin gray connector. Disconnect one of them. You will get a CEL on the dash. Take the car out. If it is fine, change them:).

HTH,
LarryB (aka RSO34:):):))
 
The ECU stores the CEL codes and you retrieve them via shorting the service connector and counting the flashing dash lights when the engine is off. There are many posts on the DIY forum to tell you how to do this. Or, you can shotgun your way through a problem with added costs and time. Your call.
Happy Motoring!
 
My NSX is sputtering under anything but WOT, so I'm thinking it may be the fuel filter. I just got the car three days ago and I can't find out where the damn thing is. I also ran lucas fuel treatment which isn't working. Please help!!

now think about IT, if the fuel filter was clogging it wold be worse under WOT, listen to larry :wink:
 
I believe the point was that you disconnect the O2 sensors and if it then runs "fine" it is the sensor. If it still runs poorly, it is not the O2 sensors.

Check the stored codes.

Sulley
 
I believe the point was that you disconnect the O2 sensors and if it then runs "fine" it is the sensor. If it still runs poorly, it is not the O2 sensors.

Check the stored codes.

Sulley

That is correct. actually if you disconnect them, the system will run in openloop mode and not use them. So it that clears up the running issue, they are bad.

HTH,
LarryB
 
Seems like it's probably not the fuel filter, but for future reference, the fuel filter is located in the engine bay on the far passanger side against the firewall.

It's a black can looking thing where you see a black tube (with red lettering) going into it on the right side of this picture.
4525784243_e5f185c35b_o.jpg
 
One person says disconnect the O2's and if it runs the same it's the sensors. Somebody else says vice versa. I have def lost power and it idles rough. Almost like a vibration. I'm changing the fuel filter, plugs, and sensors tomorrow since I already have them. Is it normal to unplug the MAF sensor and the car runs exactly the same? Any more advice would be helpful!
 
First - Listen to Brian and Larry. They know what they are talking about.

Second - If you disconnect the O2 sensors and the car runs OK then the
sensors are bad.

Third - If the car runs OK at WOT then it's not the fuel filter. However it
could be your fuel pump. This car has a 2 stage pump. To test it
you need to strap out the fuel pump resistor which forces the
pump to run at max pressure all the time (the resistor is located
just above the fuel filter and it sounds like it could solve your
problem). If strapping the resistor works then your fuel pump is
bad.

Happy Motoring!
 
First - Listen to Brian and Larry. They know what they are talking about.

Second - If you disconnect the O2 sensors and the car runs OK then the
sensors are bad.

Third - If the car runs OK at WOT then it's not the fuel filter. However it
could be your fuel pump. This car has a 2 stage pump. To test it
you need to strap out the fuel pump resistor which forces the
pump to run at max pressure all the time (the resistor is located
just above the fuel filter and it sounds like it could solve your
problem). If strapping the resistor works then your fuel pump is
bad.

Happy Motoring!

i dont understand your logic, when you say "strapping out do you mean jumpimg out the res., yes tthis will cause the fuel pump to see full voltage, (nsx uses a two stage control for the fuel pump not a two stage pump)(but he said the car runs fine at full throttle ,his car is experiencing a rough idle & throttle tip in sputtering , most likley a vacuum loss , put a vac. gauge on at idle (my car ,97 pulls 21 ") Idont like to diagnois problems with out seeing the car ,this just doesnt sound right ,he could have an EGR problem or some thing along those lines
 
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i dont understand your logic, when you say "strapping out do you mean jumpimg out the res., yes tthis will cause the fuel pump to see full voltage, (nsx uses a two stage control for the fuel pump not a two stage pump)(but he said the car runs fine at full throttle ,his car is experiencing a rough idle & throttle tip in sputtering , most likley a vacuum loss , put a vac. gauge on at idle (my car ,97 pulls 21 ") Idont like to diagnois problems with out seeing the car ,this just doesnt sound right ,he could have an EGR problem or some thing along those lines


Strap - Jump - 2 stage pump -control - he got the message. I've heard that when the resistor is bad or when the fuel pressure is low that it will cause bad idle and running below 4000rpm until the pressure increases. As far as my logic goes - well - maybe too many drugs in my adolesence.
Happy Motoring!
 
The pump is good to go. Got the plugs in and one plug was just covered in a thin black fuel smelling substance. Only one though? The rest of them looked just fine.? Ran out of daylight for O2 sensors and fuel filter. Coil packs maybe? It just misses at slight throttle and def has a loss of power...Thanks for the help and advice...
 
First - Listen to Brian and Larry. They know what they are talking about.

Second - If you disconnect the O2 sensors and the car runs OK then the
sensors are bad.

Third - If the car runs OK at WOT then it's not the fuel filter. However it
could be your fuel pump. This car has a 2 stage pump. To test it
you need to strap out the fuel pump resistor which forces the
pump to run at max pressure all the time (the resistor is located
just above the fuel filter
and it sounds like it could solve your
problem). If strapping the resistor works then your fuel pump is
bad.

Happy Motoring!

In all the years of owning my car, I've never known but always wondered what that part was. Thanks for the knowledge.:smile:
 
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