If you have 230K miles a "basic" tune tune is not good enough. With that amount of mileage you need to replace at the least: plugs, wires, cap, rotor, pcv, fuel filter, air filter, oxygen sensor, and I'm sure i've left a few things out.
Tell me what your idea of a basic tune up is. I want to know what parts you put in. their is different versions of "tune up" believe it or not. some people lack certain things when doing a tune up. i will go from there when i know exactly what you put in.TroppoZ said:Thanks to you both. I have replaced plugs, PCV, and all filters, but didn't know about the rest. I will pull my Chiltons and go through a "Major" tune up.
The thing has run so well, for so long, with so little maint., that I have fallen asleep on it...........duh, of course it needs all that stuff.
Thanks much and I will be back if I still have problems after doing all the stuff I should have done first![]()
the cap and rotor hasnt been replaced? no wires? how do you know the wires are good? how do you know the cap is good? of any tune up with a distributor, you should always replace the cap and rotor and wires if necessary. do this, spray the wires down when the car is running. if it starts missing even more, the replace the wires. also give it gas to see if it skips like a kid with a rope.TroppoZ said:Thanks for your interest, SRV1. Basically as I said: Plugs, PCV, Air and Fuel filters. I've verified timing and valve clearances several times, but neither has ever needed any adjustment. What I'm short on is what to do with EFI and ECU controlled ignition. For expample, O2 sensor was mentioned as a "must replace". OK. Anything else that is a normal "consumable" on these? Distr. cap has not been replaced, that one makes sense to me. The wires are in good condition, and I don't think that fits my symptoms, anyway, but any suggestions welcome.
Thanks
OK, I stand fully admonished!! Since all of this needs to be done, anyway, I will start here this weekend before going to the more detailed (and costly) stuff.SRV1 said:replace the cap and rotor and then do the "wet down" test to the wires and go from there. i cant accurately diagnose your problem if you havent changed the most common parts of a tune up(e.g. cap and rotor).
just to let you know, this is my idea of a tune up and should be for everyone. Fuel filter, air filter, PCV, plugs, cap, rotor, wires(if needed),bottle of fuel injector cleaner(recommend Chevron Techron), check timing(only would recommend that on higher mileage Nissans due to chain stretch) and CLEAN THOTTLE PLATE! i dont think anyone does that. you want your car to idle smoother? clean the bore of the thottle body and you will notice a difference. Also, for the newer Nissan equipped with the wire MAF(the resistor looking type, not like the old 3.0 wire ones), take a cottom swab and rubbing alcohol gently to the wire(s) and clean off the dirt and grime. that my friend is a "tune up".