350z ECU year matter for smog check? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

x_hawker · 09-14-2017, 10:05 PM

Hi everyone,

I've recently purchased a 2006 350z with a non-revup motor from a 2003-2004 Z. The older non revup motors do not have variable exhaust valve cams and so do not have the sensor hookups for those. As a result, I have a CEL for those sensors that are nonexistent on the motor I am running.

One way I can get rid of all the CEL codes is by replacing my current 2006 ECU with one from a 2003-2004 350z.

My question is, would the smog system recognize that the ECU I am running is for a 2003/2004 350z rather than a 2006? I ask because California law does not permit the use of an older motor in a newer car, despite being from the same car. Looking forward to hear what you guys think, thanks!

anthony_240 · 09-15-2017, 08:16 AM

350z never came rev up, they only came de and hr, only g35 came rev up. Your probably running a g35 ecu, just pick up a 350z Ecu any year before the hr and you'll be fine

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x_hawker · 09-16-2017, 12:45 PM

The 06 has a rev-up motor which yes, is still a de, but with different cams and variable exhaust cam timing compared to the 03-04 which did not have that function. The reason I asked is because the 06 ecu needs the sensors to allow for variable exhaust timing and when it doesn't get a signal it throws a CEL (my 03-04 motor doesn't have the sensors for, hence the CEL).

So my question is, 2003/2004 ecu in a 2006 model - will the smog system have an issue with that even though they are all technically vq35de's?

09-14-2017, 10:05 PM	#1
x_hawker Leaky Injector Join Date: May 2013 Location: Orange County, CA and San Jose, CA Age: 31 Posts: 105 Trader Rating: (0) Feedback Score: 0 reviews	350z ECU year matter for smog check? Hi everyone, I've recently purchased a 2006 350z with a non-revup motor from a 2003-2004 Z. The older non revup motors do not have variable exhaust valve cams and so do not have the sensor hookups for those. As a result, I have a CEL for those sensors that are nonexistent on the motor I am running. One way I can get rid of all the CEL codes is by replacing my current 2006 ECU with one from a 2003-2004 350z. My question is, would the smog system recognize that the ECU I am running is for a 2003/2004 350z rather than a 2006? I ask because California law does not permit the use of an older motor in a newer car, despite being from the same car. Looking forward to hear what you guys think, thanks!

09-15-2017, 08:16 AM	#2
anthony_240 Zilvia Junkie Join Date: Nov 2016 Location: Los Angeles Age: 33 Posts: 489 Trader Rating: (3) Feedback Score: 3 reviews	350z never came rev up, they only came de and hr, only g35 came rev up. Your probably running a g35 ecu, just pick up a 350z Ecu any year before the hr and you'll be fine Sent from my iPhone using Tapatalk

09-16-2017, 12:45 PM	#3
x_hawker Leaky Injector Join Date: May 2013 Location: Orange County, CA and San Jose, CA Age: 31 Posts: 105 Trader Rating: (0) Feedback Score: 0 reviews	The 06 has a rev-up motor which yes, is still a de, but with different cams and variable exhaust cam timing compared to the 03-04 which did not have that function. The reason I asked is because the 06 ecu needs the sensors to allow for variable exhaust timing and when it doesn't get a signal it throws a CEL (my 03-04 motor doesn't have the sensors for, hence the CEL). So my question is, 2003/2004 ecu in a 2006 model - will the smog system have an issue with that even though they are all technically vq35de's?