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Re: Very rough idle
The O2 sensor won't snap when removed, but you have to be very careful not to crack the boss of the O2 sensor as it known to crack and cause leaks.
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7/Sep/2009, 10:23 pm
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Re: Very rough idle
quote:
Robbo0001 wrote:
The "miss" has decreased quite considerably after numerous idle and accelerator resets...
Can you give us some idea on how much "quite considerably" is Dave ?
Like, only on acceleration now or only idling after long run or only idling, etc
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Kev X450(c)
2003 Titanium Ti Luxury Series 1 |
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8/Sep/2009, 11:23 pm
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Re: Very rough idle
From nearly stalling, revs going from 750-370 at idle in P/N/D/R, vehicle shuddering when stationary to only missing every now and then . It used to get a rhythm going and nearly stall, now its no where near as bad.
It is still noticeable however, (still gives the occasional lurch when stationary)and can be felt when accelerating as a miss low in the rpm range (hard or soft start).
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Dave
02/T30 TI (C)
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9/Sep/2009, 6:56 am
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Re: Very rough idle
Well I think I have it sorted....only a theory but it appears to be working
The car ran better with the exhaust heat shields and bash plate off which was strange.
I had noticed when I removed the bash plate that it was rubbing on the heat shield below the engine, enough to leave a nice shiny patch of scratches.
After putting in a new MAF and running a new coil over each cylinder with little change, I bought some thick rubber chair feet (circular, about 20mm deep with a hole for the mounting bolts...Bunnings 8 bucks for 2 packs) and superglued these over the holes in the bash, then reinstalled the plate.
Under the car there is now a 10mm clearance from the exhaust, and no rubbing or apparent vibration. The bash is still solid, with 7 rubber mounts.
The "miss" has pretty much gone, and I will get the Boss to run a new tank over the week to see what happens.
I can only guess that the knock sensor was picking up some of the exhaust rattle and interpretting it as pinging/knocking and screwing with the idle fuel settings. More load whilst stopped, aircon on, engine in Drive and the exhaust vibrating away on the bashpate. Not as noisy when moving, so no noticeable "miss".
Sounds feasible to me...only a theory but it appears to be working for now.
Fingers crossed
Cheers
Edit...but it could still be fuel, earthing or any other intermittent fault. Not saying I know 100 percent...but its worked so far
Last edited by Robbo0001, 14/Sep/2009, 7:02 am
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Dave
02/T30 TI (C)
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14/Sep/2009, 6:59 am
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Re: Very rough idle
quote:
Robbo0001 wrote:
I can only guess that the knock sensor was picking up some of the exhaust rattle and interpretting it as pinging/knocking and screwing with the idle fuel settings.
I highly doubt that Dave. The knock sensor would pick-up internal engine pinging, not external vibrations. It's not that intelligent 
The question I forgot to ask you previously is if you damaged any part of the exhaust previously in an off-road action? Meaning, have you hit any part of the exhaust on a rock or something to cause a slight bent anywhere in it?
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14/Sep/2009, 7:51 am
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