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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re:
Hi Gavin,
Sounds like a faulty Throttle Position Sensor this time.
The T30 is prone to have all sensors play up due to age and we are seeing more and more of them with faults CAM, Crank, TPS and O2 sensors needing replacement.
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21/Jun/2012, 3:07 pm
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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re:
I think the TPS can be replaced separately as far as I can remember.
But you can test the TPS to make sure it works correctly as described HERE
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22/Jun/2012, 11:45 am
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ziggy007
X-TRAIL NEWBIE
Date Registered: 06-2012
Location: Mortdale, Sydney
TOTAL POSTS: 17
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Re: T30 idle/power loss intermittant defect
G'day all,
I'd like to pick yr collective brains re this defect as its decided to come back.
After a month or three of normal ops (besides the idle slow to return to normal) the X'ie decided to really turn it on and just lost all power whilst driving at speed on motorway. (like the original defect) Try and pump the accelerator and can get revs going & then bang; kicked in the back like an after burner !!! Would be ok for 30 sec's or so then did it again, no discernible cycle! (repeat the whole way home.)
Pulled the Throttle body apart, cleaned the TPS and reinstalled. Reset the ECU & did all the re-learns as per the service manual. Car running great!! Drive for 20 mins no problems and bang does it again! Limp home. Bought a 2nd hand Throttle body, and new sparkies for good measure and the ol girl is running as new, really nice!!!
80+ Km s later return trip along the M4 and hit a traffic jam, and I notice the idle thing start to happen again, i.e. Sits on about 1500 or so then slow to return to idle and rough idle and a minute later she does it again loses all power, 30 mins of whiplash later to get home.
Now the start up from cold is fine although it does 'oscillate' about on the tacho, maybe 80rpm (needle-width) at the normal cold revs of 1300. Cant say I've ever bothered to check whether this is normal, Can any one verify what theirs does sometime for me please,
Slowly works its way down to 750rpm as per normal where it can then move between 750-400 and back sporadically. A noticeable 'putting' sound comes from the exhaust. I took off the Pedal position sensor plug and it rocks up to 1400ish but does slightly still oscillate.
Funny thing is, the car drives really well now. (besides idle issues) Took it for a 30min flog to try and recreate the full on engine power loss but it wouldn't play the game!!!
Tried a new camshaft sensor but no joy, Will interchange the crankshaft sensor tomorrow with idle defect evident to see if that's it , but both are only 12months old anyway.
Oxy sensor on manifold is right on spec at 3.8Ohms.
Have shake checked the wiring harnesses whiles engine rough idling and no joy. PCV checked ok.
Sprayed the pedal poison sensor with contact cleaner for no change.
Too me, something is telling the car to idle 'wrongly' all the time but what ever is causing the massive power loss is totally intermittent, so I'm going to get a 2nd hand pedal sensor and throw it in any way.
Just though maybe someone could give me a 'why don't you look at the "????" you goose, in case I'm just not seeing something. My dealings with Nissan have been moderate to say the least in the 7 yrs I've owned the car so would like to exhaust all avenues before taking it and my hard earned back to them!
Other wise I'd think it could be the ECM itself. Has anyone needed to replace the ECM before?
Cheers & thanks
Gavin
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14/Oct/2012, 8:11 pm
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Toddyh03
X-TRAIL HOLIC
Date Registered: 08-2011
Location: Lalor Park, NSW
TOTAL POSTS: 1663
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Re: T30 idle/power loss intermittant defect
Sounds like you're checking all the right things to me. Maybe check the mass air flow sensor too.
--- Toddyh X-2048 (c)
New: Challenger
Old: 2010 T31 Diesel modified
My XTrail
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14/Oct/2012, 9:21 pm
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Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: T30 idle/power loss intermittant defect
What I consider the main things needed for power to be developed and the engine to run smoothly are the following...
- good supply of petrol (clean filter, clean injectors, fuel pump pressure good)
- air sensors working (oxygen sensor and MAF)
- clean air filter
- pedal sensor good
- throttle body good
- idle air and pedel relearn done
- cam and crank sensors good
- spark plugs good
You have done the relearns, throttle body, cleaned the MAF, spark plugs, camshaft sensor, pedel sensors, oxygen sensor (though I think a clean might not be good enough for this).
So my suggestion in order of lowest cost/easiest upwards...
- air filter
- crank sensor
- fuel filter
- check fuel pump pressure
- injector service (replace filter buckets) as detailed by evorock in another thread.
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog
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14/Oct/2012, 11:26 pm
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