Hiya Guys,

I hope you can help me. Yesterday I got a new fuel filter, air filter and O2 sensor installed. Now all of a sudden today I am driving around and when I am stopped at a light or something after a couple of minutes (not all the time) my engine will kinda die down 200-300 RPMS and then pop right back up to its normal position. I am not sure why it is doing this, it just started happening today after I got those parts installed, I never had this problem before. Anything you guys can suggest? Is it the car adjusting to the new parts or something? I am really hoping you can help me. I got a Puralator Fuel Filter, K&N Air Filter and a Standard brand O2 sensor. Any feedback will be greatly appreciated. I also recently had one of those Auxilary Transmission coolers installed. But the tranny seems fine. Please help me out.

Oh and I got an 89 Max SE

Thanks a million.

 

today put on a k&n cone filter (ghetto made) it fell off when i went to test and the engine was bout to quit. i think it got something to do with ECU getting different reading making it put more or less fuel in or something like that. now i screwed it on the MAF piece and been running pretty good (for now)

 

that o2 sensor could be faulty, causing this kin dof up and down idling to occur
check it out
and always buy factory parts if you can!

 

Before buying a new O2 sensor or blaming it on that, disconnect the negative battery terminal for 12 hours straight to allow the ECU to reset. Then run the car. I bet your problems will cease. When I put my K&N in my old white 91 SE, I had the same problem. I remedied it by doing the above. Try it out and let me know what happens. I think the ECU just needs to be reset by having the negative battery terminal disconnected.

 

Thanks for the advice, I will disconnect the negative battery terminal tonight. Now why does this occur? How does it happen? It just freaked me out, I was thinking the car was going to die on me. Are there any other things that would cause this type of activity to happen? Like I said above this only started happening after I put those new parts in the car. The wierd thing is that it only happens when the car is in drive and my foot is on the brake, when it is in park it seems to idle just fine. And it doesn't happen in any kind of pattern, it just happens sometimes and not others. I will totally try the battery trick and pray that it works. Any other advice or information would be greatly appreciated.

 

The element inside the 02 sensor is very delicate. If it is droped it can break internally. It is possible it had been damaged before installing. If this is the case they sould replace it for free.

I believe on the packaging on most 02 sensors warn of this (dropping it).

 

Well if that is the case, how much would a factory O2 sensor run me? Because I will just buy a factory one and then return the other one to the store. I will however try the trick with the battery first to see if that resolves the problem. If not I will look into replacing the O2 sensor. Thanks for your help.

 

I bet if you take out the K&N filter all your probs will be solved...the K&Ns have been known to cause idle probs on our cars.

 

well you can reset the ecu and it will re learn the parameters for the airflow meter. for the k&n if not you have to wait 50 starts for it to reset itself
have fun

 

If you use the drop in filter replacement (K&N) the VG Maximas lean themselves out and then all of a sudden the ECU compensates. The MAF sensor doesn't appear to be able to cope with the filter when it is applied in the standard airbox. Perhaps because of turbulance created in the airbox. Dunno. The cone filters seem to work for all those that have tried them.

I tried a panel filter (VG motor) and I did exactly what you described. Put the standard one back in and the problems went away. Put the panel filter (K&N) into my mates VE and he experienced none of the problems I did. Wierd!

Brent

 

Thanks a lot guys. I guess this darn air filter, which cost me 50 bucks is the cause of my problems. I am going to reset the ECU tonight and see what happens, I will let you know the results. And I really want to thank you for all of your help.

 

If you find after removing the filter the problem is solved, return the filter and get your money back. Worked for me!

B.

 

get the place racing intake or jim wolf intake dont buy stillen do much dang money

and if you stick with factory air filter buy nissan its worth it.