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Discussion Starter #1
Ok here is the deal. I bought a 93 NX2000 for $2,200. It ran kinda crappy but with 157K and having sept tabs it just needed a major tune up. Well I have changed the oil and oil filter, plugs, cap, rotor, and fuel filter and put on a pop charger, and it does run a little better. The thing is, I have just driven it with a full tank of 92 octane chevron supreme and I got barely over 200 miles to the whole freakin tank. I just checked my new Bosch platinum plugs that have been in for those 200 miles and they are pretty black around the edges. I get pretty bad hesitation and an idle that drops down to 400rpm and then settles at a rough 800rpm. I took it to nissan for a diagnostic and they said something about having a bad diode in my alternator but they are confident that it is not causing my car to run powerless and crappy. Hell, my brothers stock 89 civic hatchback is faster than my NX!!!! what the hell is that. I am very NOT mechanically inclined, but with good pics and very good instructions I can do pretty good. The technical terms and directions on se-r.net don't help me too much. I want to check my egr valve and reground my MAF but i don't want to screw up my car even worse( at least my NX is faster than my wifes Kia Rio, and I'd like to keep it that way!!!) can someone please help me? thanks, my email is
[email protected] your help is greatly appreciated.


Daniel K
93 NX2000
 
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Hey you might want to try changing your oxygen sensor. This should take care of the problem. Or take it back to nissan and tell them to check and see if your O2 sensor is sweeping. Let me know what happens.
 
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My Classic ran like absolute crap until I changed the O2 sensor, and cleaned out my EGR valve(on SE-R.net under tuneups)-Try those two first-Good Luck!
 
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I thought my Sentra ran well until I reground the MAF, and cleaned the EGR, and then plugged the thing, I didn't know how great the car could be.
 

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Discussion Starter #5
Thanks guys, I'll try those. Nissan said that they could not run the full diagnostic because the bad alternator was throwing off the diognosis machine. I'll try changing the O2 sensor and attempt to clean the EGR. I'll let you guys know soon here.


Daniel K
93 NX2000
 

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Discussion Starter #6
did removing the egr help do anything practical. We have emission tests we have to pass every other year in order to get tabs.
do you just pull out the egr? do you have to permanently clamp any hoses or anything?


Daniel K
93 NX2000
 
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or you just can remove the egr like i did...or even better just remove the whole emissions subsystem....like i did...

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1993 NX2000
with stuff.
 

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Discussion Starter #9
what should i set my timing at. I always use the 89 oct gas and sometimes i use 92. I dont want to have to use 92 all the time, My delSol VTEC called for 92 when it was stock!!! and i kind of like not feeling like I have to pump it full of the most expensive stuff. My engine is stock except for pop charger. 15 or 16 would be sufficient. any suggestions.



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Daniel K
93 NX2000 w/ intake and more to come!!!!!
 

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pwnd
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Running 17 with 87 is very dangerous. You may be detonating and not even know it. Its a hard thing to hear in the car at speed, when it is most prevelant. Sitting there timing it you may not hear it, but that doesnt mean it wont do it at higher rpm's and engine loads.

I wouldnt recomened past 15 on 87 octane. I run 15 at 89, just because I've always put 89 in it. I figure I should treat it a little better than my old samurai I had. Its recomened, almost a given, run 93 when you run 17 degrees. Just make sure you follow the steps for it, and maybe even have someone else that has done it before check it to. Because I checked mine and it looked good at 15, Eric checked it and appeared to be at like 13 or 10. But that would really help your performance and gas mileage. My car picked up a few mpg's and now feels alot stronger.

Its like a guess of mine(not proven but not disproven, i read it about 240sx ecus so figure it transfers over to ours also) that the ecu will pull timing out as you get on the gas. Like if you go to WOT it pulls out a few degrees of advance, probaly as much as 5 or more, then slowly adds it back it as it finds not detonation and problems. So if you are setting like i was at 10 to 13, the timeing may go back down to like 5 till it dials the advance back in. I thought it was partialy the automatic tranny getting up to speed, but i could feel the engine get stronger as i went. now its not as bad since timing doesnt get retarded as far.

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Thats my opinion and I could be wrong

93 classic
Aztec Red, Automatic, POP, STB, OEC battery tie down, AD22VF's, Pirelli P4000's

 

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pwnd
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Errr 92 not 93 octane


Check your wires also. Tip for that is wait till its dark out side, and take a fine mist spray bottle and lightly mist them. If you see sparks between them and the valve cover then you need new wires. But that just means the jacket is bad, so they could actualy be bad and not spark. But the bad gas mileage is almost always atributed to a bad O2 sensor, and possibly timing.
 

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Discussion Starter #13
If it was a bad O2 Sensor wouldnt the car have failed emissions tests...I live in WA and my car passed emissions with flying colors.


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Daniel K
93 NX2000 w/ intake and more to come!!!!!
 
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