Nissan QX - High emission and stalling

Honest John Back Room » Technical matters
What is life like with your car? Let us know and win £500 in John Lewis vouchers | No thanks
View Threaded
Mon 14 Feb 2005 11:00
Nissan QX - High emission and stalling - Gazza
The car is going into Lookers Nissan in Camden, London, tomorrow morning, for a diagnosis. As some BRer might recall, the emission is still high and the car cut out twice last week, both on me and on my girlfriened while exiting an motorway when we lifted off the throttle. It was not very nice to have no power-assistance to the brakes and steering when exiting motorway.

Nissan say they will charge £84 + VAT so I'll wait and see how it goes.

Does that sounds right? Any other ideas before I let Nissan loose on my car?

Sorry for such a late post.

Many thanks,
Gazza
Reply | Report as offensive | Link
Mon 14 Feb 2005 17:33
Nissan QX - High emission and stalling - Aprilia
Hi Gazza

Hope you got the remote OK.

You can read the fault codes yourself (using flash codes) - instructions are in the workshop manual.

When you posted before about the emissions I think the diagnosis was faulty lambda sensor. I'll be this is the source of your problem. You can check the lambda sensor yourself (either with a cheap digital multimeter or one of those £16 lambda testers from Eurocar parts)

As to cutting out - I would give the throttle body a very thorough clean. Its dead easy to do (use a toothbrush and a can of carb cleaner). It gets very dirty top and bottom just where the butterfly *almost* touches the bore. Also blast some carb cleaner into the IACV passages and lube the throttle linkage on the side of the throttle body.
Reply | Report as offensive | Link
Tue 15 Feb 2005 23:17
Nissan QX - High emission and stalling - Gazza
Many thanks Apprilla.

Time to fork out for some expense bit :-(

The self-diagnostic shows

1) Knock Sensor
2) Closed-loop (Front O2 sensor)

I have found a Bosch part number for the Knock Sensor - Part # 329297 F6020-51596

Would anyone know where I can buy the Bosch Knock Sensor from in London?

For the O2 sensor, where is the best place to buy one (cheaply)

Many thanks,
Garrison
Reply | Report as offensive | Link
Wed 16 Feb 2005 00:03
Nissan QX - High emission and stalling - Aprilia
Gazza

I believe the lambda sensor WILL be faulty. Get a replacement part from your dealer (or a US dealer like Courtesy Nissan - will be cheaper) or you can buy an aftermarket part cheaply from the likes of Fuel Systems UK or www.lambdasensor.co.uk/

Watch out for the knock sensor code though. I gather that the QX ECU will nearly always give a knock sensor error code, even if its not faulty - there is a lot of information about this on the US Maxima forum. The knock sensor is quite cheap from the US dealers (even with air mail) but I suspect it will be expensive in the UK. Just try ringing your local Bosch agent for a price or maybe see if a breaker will take one off a write-off QX for a few quid.

Personally I would just replace the lambda sensor to get you through the emissions test and then sort out the knock sensor later. BTW - check your own fault codes on the ECU - don't pay the dealer to do it for you, its dead easy.
Replace the lambda sensor, reset the ECU and take it for a run and then re-check for the knock sensor code.
Reply | Report as offensive | Link

We give you the low down on how to save on insurance, little-known tricks and tips, what insurance groups mean and how to use insurance aggregators to beat insurers.

Insurance group finder and how to save on insurance