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Discussion Starter · #1 ·
While replacing my air filter I decided to clean my throttle body which is so accessible on the Nissan Note. I purchased a specialised carburetor cleaner from a company called car pride.

Now It does not have an ingredients list on the side of the spray but being a chemist by trade I know it contains a chemical called acetone. Acetone has a very low boiling point and will evaporate when exposed to air.

When I removed the throttle body from the car there was a small carbon deposit which was removed by the spray. The acetone evaporated quickly but prior to replacing the throttle body I noticed that the surface of the metal plate which regulates the airflow had been removed by the cleaner. I didn't really see this as a major problem as it is an aesthetic problem and not one that effects the functioning of the car.

However, the problem is since I've started up the car from cold for perhaps the first 20 seconds the engine is very loud. As someone who has had alot of engine problems before it sounds as if there is a problem with the throttle body.

Now a new throttle body from Nissan is very expensive. I've been looking on ebay for a replacement do you think I should buy it and replace the throttle body? I will try and upload a video of the car engine starting from cold.



Thanks
 

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I would double check the connections to the TB I have used carb cleaner for many years without issues
you may of upset the MAF or disturbed the pipe work causing a air leak

do you have a 1.4 or 1.6 (1.5 petrol in a jdm car)
 

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If it sounds louder but doesn't rev any faster it would suggest a leak on the air intake or exhaust side of the engine. May also be the air filter letting more air through. If it's revving faster it may be the MAF sensor. Good luck on finding the cause and keep us posted.
 

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Discussion Starter · #4 ·
I have a 1.6 litre petrol Note. I will check the connections tonight on the throttle body.

When I turn the car on the revs always start at I think 15K and then settle down to 10K as the car heats up. This behaviour does not appeared to have changed.

I have been very careful when replacing the pipe from the airfilter to the throttle body. I can't imagine I've put the air filter in wrong its such a simple job and is designed to fit only one way.

Thanks for the support I will keep you all posted.
 

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paranoid_note_owner said:
When I turn the car on the revs always start at I think 15K ...

**WOW**

I think you mean 1500 - even an F1 car doesn't tick over at 15000 rpm (though it does rev much higher than that!)

Sorry.. couldn't resist!
 

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Hmm.. my 1.6 petrol ticks over at around 800rpm even when cold.In fact the tickover speed hardly varies at all from cold to hot.

I'd be very tempted to get one of the cheap ODB adaptors and a mobile phone app - then you can see the tickover speed (and engine temperature) to a fair degree of accuracy.

I'm a bit busy at the mo but if I can get a minute I'll plug in my adaptor and try to post a relevant screenshot.
 

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So am I, it's the weather.
15K revs, photos please of the 'F1' Note.
 

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1500 from a cold start is correct it should settle to 850-1000 once warm

There's lots of factors that effect the idle inc wether its a euro 4 or 5 spec engine
 

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As promised - here are a couple of screenshots from 'Torque Pro' - one stationary and one on the move...

 

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Discussion Starter · #13 ·
Hi,

Firstly, I would like to say thank you everybody for your wonderful input. This community is pretty amazing.

I received my OBD bluetooth adaptor and managed to get it connected to my android (Galaxy 2) smartphone.

From the dials I saw my coolant temperature maxed out at about 98C it was actually about 90C while driving but strangely went up after I had finished the drive and the car was idling in park.

My idling revolutions while in park or neutral were around 850.

Here are some of the vehicle test results.

Rich to Lean sensor threshold
voltage (constant)
Max: 95
Current: 4

Lean to Rich sensor threshold
voltage (constant)
Min 50
Current: 255

Time between sensor transitions (calculated)
Max 69
Current: 8

Sensor period (calculated)
Min: 60
Current: 82

EWMA Misfire counts (average) for last 10 drive cycles
Max: 34
Current: 32

Misfire counts for last/current driving cycles (calculated)
Max: 119
Current: 32




Edited by: paranoid_note_owner
 

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paranoid_note_owner said:
From the dials I saw my coolant temperature maxed out at about 98C it was actually about 90C while driving but strangely went up after I had finished the drive and the car was idling in park.


That's not strange at all.. when driving the majority of the cooling effect is from air movement through the radiator due to the car's motion. When you stop, the airflow drastically reduces and so the temperature goes up. Eventually the electric fan will kick in and bring the temperature down again until the fan stops. If you leave the car parked for longer you should see this cycle happening.

Your inlet temperature was higher than mine but it may just be that today was hotter than yestarday (it certainly was here) or that your under-bonnet temperature was higher.

Can't comment on all the other readings - way over my head - sorry!
 

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Discussion Starter · #16 ·
I went out this morning and removed the pipe between the air intake and throttle body to check that all the electronic connections were sitting properly and that no air was escaping from either end of the pipes.

After refitting the pipe I started the engine. On startup it was still loud. The only thing I noticed out of the ordinary was the revolutions. When I turned the key the car started from cold at approximately 2000 rpm not 1500 rpm as previously thought and slowly went down to 850 rpm within about a 2 minutes .

Edited by: paranoid_note_owner
 

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paranoid_note_owner said:
From the dials I saw my coolant temperature maxed out at about 98C it was actually about 90C while driving but strangely went up after I had finished the drive and the car was idling in park.
Not strange if you think about it as no air movement through the radiator/ over the engine save for the radiator fan.
 

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Hi. got a diesel note, 61 reg, dont ask me the engine type etc etc
i dont know. its a diesel!!
Any way. what bluetooth obd adapter did you get. how much. where from etc etc. Oh and I would like to connect it to my google nexus 7 btw.
thanks.
 
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