stylett9

iTrader: (9)

if you are sputtering around 3-4K RPM you probably don't have the same issue.

FastGreg

P0300 causes (from crankshaft position sensor):

- Improper spark plug,
- Insufficient compression,
- Incorrect fuel pressure,
- The fuel injector circuit is open or shorted,
- Fuel injector,
- Intake air leak,
- The ignition signal circuit is open or shorted,
- Lack of fuel,
- Signal plate,
- Air fuel ratio (A/F) sensor 1
- Incorrect PCV hose connection...

Did you felt any problem (misfire) or only the engine light on whitout symptom ? In that case it might be the crankshaft position sensor itself wich is faulty ?

This code appeared at the Nissan garage last time when they tried to fix my car and tested it...

There is definitely an issue with those 2007 VQ35HR.... With more or less same symptom...

Good luck !

FastGreg

And what about the last Nissan recall ....

http://www.nissanextendedwarranty.co...n-recalls.html

Maybe, an another way to follow ? I don't think so, but why not ?

srsairbags

well, i have a strong feeling (in my gut area) that it is the a/f ratio along with the ecu over reacting which may be causing the issue . . as once the sputtering is gone (extended warm up) everything is fine . . it has to be something to do with the ECU open loop to closed loop transition . . . can we monitor the ecu doing this transition ? is the ecu jumping back and forth between the two loops ? . . . . like a see-saw ? am i being delusional ?

bardabe

iTrader: (5)

Uhhhh last time I checked Nissan FAST 2007 & 2008 Z33 O2 sensors for the front where the same part number. Primaries should be the same fir L and R too

Q8y_drifter

Is this issue only occurring on the 07 models? The 07-08 HR G35 sedans aren't reporting any issues regarding any sputtering :/

srsairbags

heard some 08 HR Z also had the issue in this very thread . .


Fasrgreg . . any updates ?

srsairbags

the sputtering starts at magical 1.8k and is present all the way upto 4k when you give gas while sputtering . . .

FastGreg

2007 HR are equiped with 234-9072 Denso AFR sensor (front, same to the left and the right):



2008 HR are equiped with 234-9036 Denso AFR sensor (front, same to the left and the right), same as the 370Z one's:



And VERY different prices (more than the double for the 2008 model)...

Rear one's are different, ref. 234-4380, but same model for 2007 and 2008:



You can check your parts here: http://www.densoaftermarket.com/catalog/

Not receive my gaskets yet to start the job

Q8y_drifter

So by A/F ratio sensor they mean the ones installed on the manifold and by Oxygen sensor they mean the ones on the cats?

Looking at the 07 and 08 G35 HR, they also have different A/F ratio sensors but same Oxygen sensors.

srsairbags

also . .has anyone looked into the afr sensor heater control circuit operation? it seems the ecm varies the heater circuit voltage based on rpm and air volume . . . a bad heater circuit (open/short or degraded signal) can cause our symptoms . . ie delayed afr warm up as the engine gradually warms up

for more info please read up 2007 service manual EC: pages 165-172

FastGreg

Yes , A/F ratio sensor it's the other name for the wide range O2 sensor

A short article about it: http://www.aa1car.com/library/wraf.htm and regarding common O2 sensor: http://www.aa1car.com/library/o2sensor.htm

Q8y_drifter

Yeah i know what they are just makin sure since some people refer to both as just oxygen sensors

FastGreg

It should show a DTC, I guess... But it could be an answer

Damned, if we succeed to solve this issue we will be heroes

srsairbags

A/F sensor 1 (both banks) = wideband according to bosch

p/n 15368 Wideband A/F Sensor - OE Type - Exact Fit - Upstream Sensor Two required; 4 Wire; Wideband A/F; Check / Replace Interval: 100,000 Miles

V6-3498cc 3.5L FI EngDesg VQ35HR GAS



the second o2 sensor is not wideband

15370 Oxygen Sensor - OE Type - Exact Fit - Downstream Sensor Two required; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles


soo . . theyre supposed to last 100k . . . hmmm

srsairbags

i dont think that it will show a DTC if it was open at sensor end (heater filament blown) or if the harness lost continuity . . .

Also just wanted to know if our ECMs are discrete for the Z or are same for all VQ35HR vehicles ?

i sure hope that we can fix this issue and fast . . .i love my z, but this thing is really getting annoying

FastGreg

That's right, I just check the service manual:



As some DTC just appear after two failures, does anyone try to switch off the car during sputtering and re start it, after few seconds ?

I just realize that this thread started in November 2007, that's amazing...

FastGreg

Hey guys, I find something on the Japanes Nissan web site (apologizes for the google translation !):

http://www.nissan.co.jp/RECALL/DATA/report1886.html

Nissan link: http://www.nissan.co.jp/RECALL/RECALLLIST/ May 31, 2007

Recall dated 1 June 2007 number 1886 (before the slave cylinder recall !!!!)

2006 December 19th ~ 2007 March 26th 137 unit (2 type of total) (total 1 model) (period range of whole production) 2006 December 19th ~ 2007 March 27th total 1,248 units
Recall notification number 1886 recall target date 2007 June 1st

"When there is a standard nonconformance state, because the structure which is recognized, circumstance of the device or efficiency and the program of its cause motive for action machine control computer are inadequate, when the throttle opening sensor which measures the opening of air flow meter and the throttle valve which measure the inhalation air quantity breaks down, the warning light does not light up. The contents all vehicle of improvement, the particular program is modified. Because recall object also the vehicle which does not become the object is included in the range of the under carriage number where the car is included, concerning details please inquire to the dealership which you buy. Recall object production period of the car does not agree with the time of purchase. Under carriage number is printed to car verification. "

And somme japanese blogs:

http://blogs.yahoo.co.jp/neko_technology/1843053.html

And I'm afraid it's not a good news...

Here's the translation:

"It is the closely many inquiry. When idling, 1800 [rpm rises to rpm] and 1000 [rpm] the condition which repeats going down is successive to extent. With the shop way, air leak inspection various sensor inspections are done, unless abnormality, it was thing. Then, remaining lastly is ECU. Temporarily, with the shop way having exchanging ECU to trial, when you verified whether hunting it does not do, the beautiful solution!!! So, why it probably is to become this kind of thing? It tried verifying ECU where promptly, condition of hunting appears. Hard, it seems that does not have abnormality. So, program??? With you thought and tried transferring the same data, but it does not solve. … It broke down verified making use of the diagnostic machine but there is no abnormality. It tried to do idling study but ECU does not permit study. When with it becomes, only abnormality you can think the memory which is in ECU. Promptly, it tried verifying the data of memory. The throttle (the air quantity) the study data is strange!? . In trial, it rewrote this study value to the data of the car which is operational normally and the engine tried doing starting throttle study. Beautiful hunting stopped. As for cause, being like it is on software side the shank. Because conclusive evidence took, you question to the dealer and it is in combination. By the way, when unit number was verified with the NISSAN part as description below they were contents. The unit number whose exchange is necessary Measure the unit number which is done
23710-EV13A/EV13B →→→ 23710-EV13D
23710-EV14A/EV14B →→→ 23710-EV14D"

It seems that new ECU has been issued to solve the problem (D version)...

Another blog: http://www.melma.com/backnumber_164524_3702972/

"○Z33 VQ35HR owner news ○ to 　　ECU is related to NISSAN fair ready Z Z33 VQ35HR the recall where 　　It was announced. 　　As for details, the NISSAN HP http://www.nissan.co.jp/ 　　Being similar, the object car 輌 body number in regard to verification, measure with the dealer 　　To receive, the fish you ask. 　　As for the customer who already has purchased VX-ROM for VQ35HR, 　　The program of ECU becomes modification (normal condition) with, but after the measure 　　For the second time because it rewrites to VX-ROM being free, communication. 　　The data of #VX-ROM becomes those after the measure, but with the dealer 　　　To receive the measure program, the fish you ask.　 "

Q8y_drifter

so it's an ECU software issue after all? That's actually good IMO.
Mechanical problem = Bad lol

Were there any recalls / tsb's in the US regarding the ECU's?

FastGreg

More information here: http://www.dogandlemon.com/node/82827

RJ-1886-0
Case Number:
RJ-1886-0
Period:
2006-12-19 - 2007-03-27
Issued:
Thu, 2007-05-31
Affected:
1248
Component:
engine control unit (ECU)
There is a glitch in the ECU program, and therefore, even when the air flow meter, which measures intake air amount, or the throttle position sensor, which measures an angle of the throttle valve, malfunctions, the warning light will not illuminate.

Diagram:
http://carinf.mlit.go.jp/jidosha/car...ger?No=1118860
Correction:
The ECU program should be changed.

Identification:
silver sticker on the right hand side of the model number plate

Affected Vehicle(s)
Vehicle: NISSAN FAIRLADY Z type CBA-Z33
Manufactured: N/A
Affected: N/A
VIN/Eng #: Z33-500002..Z33-501136
Vehicle: NISSAN FAIRLADY Z type CBA-HZ33
Manufactured: N/A
Affected: N/A
VIN/Eng #: HZ33-400001..HZ33-400145