Actually main question is to sportbiketed, you said you got this issue in the past with the AEM intake and went into limp mode. But did you get codes? if so what were they? the same as mine or different?

 

The ECM is seeing 0V. That's what the code means. Either there's an unplugged harness, broken wires or a blown fuse (or short in the ECM or both sensors failed at the same time, both unlikely). The ECM doesn't look for the senors immediately. When it does, the car goes into limp mode.

EDIT: Your car is an '04? Those codes aren't applicable to an '04. You don't even have A/F sensors. You have Oxygen sensors. Is the car tuned? Has the ECM been replaced? Sounds like the ECM is looking for voltage on a pin but isn't seeing it because you don't have that pin connected (because you don't have those sensors).

 

This was about 4 years ago so I don't recall if my CEL was on.


He has an 04.5 which has A/F sensors.

 

Yes, apparently my car according to my VIN is a 2004.5.

I found these issues, they seem similar to mine and seems it may be MAF related with the same 2 codes...

http://www.justanswer.com/nissan/25b...requently.html



Here on a titan, but still....

http://www.titantalk.com/forums/tita...271-p1281.html

 

If the 04.5 does have wb af sensors like the 05+ do then I guess the code is applicable. Either way I think you should run it dry and see what happens. Surely you can find somewhere to take it to do a WOT pull or two, no?

 

I own a 2005 350Z and I recently installed a AEM cold air intake yesterday. Today my car decided to go "Limp Mode" I couldn't get passed 2500 RPM. I got the same exact 2 codes as you. P1271 and P1281. From what I have researched and found out, this is the air fuel ratio. In order to fix this issue from what I have found out you will need to get a tune so that your air fuel ratio isn't completely different. I had my brother sit next to me with the scan tool as I drove and found out my engine was getting way to much air and way to little fuel. So in this coming week I am taking it to a shop to get tuned up and fix this issue and if that doesn't work I'm getting bigger injectors! But hopefully this was helpful because finding your post was helpful to me, I thought I really broke something lol. Thank you and I wish you luck!

 

The problem you mention is not typically caused by a CAI or SRI. Hundreds have installed them without any issue. The fact is that they make such a small difference in increased air that it would not throw your engine so far out of whack that it would go in to limp mode. The problem is typically a case of inadvertently causing a vacuum leak, usually from not connecting a hose. Even that would typically not cause you to go into limp mode. Go back and check your install.

 

Wait! before you do anything! All my issue here was from a wet MAF sensor. I think I may know your issue! I too once had it the day I installed my AEM intake, I installed the MAF tube backwards! Got into limp mode etc... Took me a while to figure it out, but it has to be facing the right way, I guarantee that's your problem.

 

any updates man? this thread was killer.

 

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