I have been having trouble getting my VQ35 swap working properly (Running with VQ30 ECU).

An ongoing saga to get it running;

http://forums.maxima.org/supercharge...wt-95-ecu.html

I was trying to remember if I purchased new O2 sensors in 2006 when I first did the conversion, or used the ones that were on the engine. The ones on the car now are "fat" looking, the number on them (best I can tell) is 024A71145. It looks like the 1995-1998 O2 sensor is a different part, it has a thinner body.. Does this matter??

The one I have looks like this;
http://info.rockauto.com/getimage/ge...SG690_FULL.jpg

The one Rock Auto lists for 1995-1998 is this;
http://info.rockauto.com/getimage/ge...SG291_FULL.jpg

Could this by why (or partly why) it is not running correctly? The WideBand O2 indicates the engine is usually running lean. Is it critical that the 95 ECU have a 95 O2 sensor?

Thanks.

 

Wow, I thought this would be an easy one.

 

Well the first picture is a 5.5 gen 02 and the second is a 4th gen. When I did my swap we used all 4th gen 02's. I actually still have the original sensors from the engine laying around. Is the blue one that you have now on the car? If so where is it plugged in at?

 

The sensor is metal, silver. The wire does have a blue mesh over it. Plugged in? they are plugged in to the O2 sensor connector on the harness.

 

I meant where is it located on your exhaust? I know the ones with the blue mesh usually go in the 5.5 gen headers.

 

What's the A32 ECU telling you?

 

I have them in the exhaust directly after the header.. It is within a few inches of where the exhaust pipe connects to the header.

The O2 sometimes have readings, sometimes don't. I have no way of knowing if it is what the ECU wants to see though.

I'd be happy to send my BlaZt logs to anyone who wants to offer advice!

 

Any codes?

 

Tried to pull codes through the consult, but the software said "error reading codes". Friend has a hand held ODB tool I am going to try and use.. I am sure there are lots of codes based on all the missing stuff.. Question is, are those codes relevant?

I will report back if I get any codes.

 

Get them the old fashion way. It's a place to start.

 

BLAZT gives these codes;

42
81
83
84
87
93
D2

I have not been able to find a reference for the Nissan ODB1. I am sure there is one around her, I will keep looking.

 

I don't think the A32 ECU is able to accurately read the signal off of a 5.5 gen O2 sensor, if that's the case.

That may explain the issues you're having in closed loop (part throttle/cruise)

 

OBD I, why OBD I?

All A32's are OBD II.

 

Sorry, I dont know what A32 means.. The ECU is from a 95 Maxima, and has been modified by JWT.

2 new codes on it this morning. Add 41 and 105 to the list...

Anyone know what the codes mean??

 

Why don't you pull the codes the old fashioned way? Turn the screw on the ECU.

http://forums.maxima.org/707601-post1.html

A32 = 4th gen Maxima chassis code.

 

because the ECU is buried under a bunch of other stuff. Real PIA to get to.

I will have access to a regular hand-held code reader this weekend. I will check the codes again then. I just thought maybe those BlaZt codes were useful.

 

Oh yeah that's right I forgot about that. I'd say get the 4th gen sensors.

 

I'm pretty sure that's whats crippling your closed loop operation, since part throttle/cruise relies solely on a good primary O2 sensor signal and MAF signal.

 

Im thinking the same thing.

 

JWT has now told me twice (with no explanation) that the O2 sensors I am using are correct...

 

You're using 5.5 gen O2 sensors with a 4th gen ECU. Try 4th gen sensors and see what happens. Sometimes JWT =

 

Maybe, but they modified the ECU so I would hope they know what they are talking about..

 

To my understanding, JWT modifies the fuel/timing maps to help the car run properly in closed loop and open loop per your requirements. They do not manipulate the way the 4th gen ECU reads a foreign O2 sensor signal.

 

That translate too
0402
0801
0803
0804
0807
0903

 

You need 2 of the second o2 sensors you have in your first post to make your normal driving and cruising better if you dont have the proper o2's then the ecu will run off is own maps which are not ideal.

 

Then why did Jim Wolf (the man himself) tell me 3 times the O2 sensors I have are correct??

They are supposed to be sending me a new map this week. I will try that. Hopefully it will work for my 1400 mile trip next week. If it still does not go in to closed loop, I will try the 95 style O2 sensors.

 

Sorry my fault, I did not see that the first ones were also 3 wire sensors. They should work.

But if they don't you might have to get the skinny sensors.



Also none of those codes seems to be a problem for the car to run. So hopefully it is the alternator.

 

Bad o2's can mess your tune up so bad it can turn off the car. It used to happen to me, had a faulty o2 and it would lean the car out so bad it bogged and turned off. thats why i was 3 years with no o2's till now that i got brand new ones.