AUII 6 cylinder miss

_Ben · 18-06-2012, 04:39 PM

Hey guys

Having an issue with my AUII Futura. It's missing quite badly on idle, however as the engine goes under load, the miss almost entirely disappears. I have replaced the spark plugs, leads AND coilpack but its still there.
What next?

Thanks, Ben

TheSly1 · 18-06-2012, 04:50 PM

This might be way out of the ballpark but what about coolant temp sensor? if its incorrect and reading way to low it might be dumping to much fuel in? as its reving up its clearing itself

maybe put your dash into diagnostic mode, i think itll show then what its reading..

not 100% sure but that sensor is in back of the head... but check that.. Hope it helps

SirHenry · 18-06-2012, 07:24 PM

Maybe try cleaning the throttle body, has the battery been disconnected? that can affect the base idle and take a bit for it to relearn.

Could also be ecu learning new leads and coil pack perhaps? Mine seem to take a while to come good.

_Ben · 18-06-2012, 08:22 PM

Its been missing for a while now (2 months or something like that). I did plugs and leads about a month ago, and its just been getting worse and worse.

As of about 2 days ago, idle seems to be completely spastic. When I put the car in neutral at a set of lights, it will sometimes go up to 1600 RPM, before slowly settling down to 1000ish, not ~600-800 like it used to. I'm thinking this may be unrelated and the throttle cable may need adjusting, im not sure though.
:(

**SSD-85** · 18-06-2012, 08:44 PM

Could still almost be anything. Diagnose in order of expense

Try the Oxygen sensor.

TheSly1 · 18-06-2012, 08:56 PM

Put it in diagnostic mode first in the dash.. see if anything weird shows up first.. its free and might help diagnose..

_Ben · 18-06-2012, 09:02 PM

Aight, I'll check that out tomorrow. Is there a tutorial on here on how to do it?

_Ben · 18-06-2012, 09:26 PM

Also, because I can't edit my earlier posts:

I also heard a reasonably loud hissing sound from the intake tonight when I got home from around the TB / the 180 degree bend in the pipe. Is this normal?

IH8HSV · 18-06-2012, 09:28 PM

The diagnostic mode can be entered by using the following method

1) With the ignition key in the off position, turn the Ignition Key to the On Position.
2) Using the Odometer Button, Press the Odometer Button Down, then release 5 Times within 10 Seconds (Note : You must be very accurate with the timing. Depress the Button for 1 second, then release for 1 second. Do this 5 Times in 10 seconds)
3) Release the Odometer Button for 5 seconds.
4) Depress the Odometer Button for 7 Seconds.
5) Release the Odometer Button for 5 Seconds.
6) Depress the Odometer Button for 7 Seconds.

To change between views from each one press the odo reset button.

1) 73 (Petrol in L - no level buffering) / 175 (Petrol Sender Resistance - Unbuffered)
2) 510 (Unknown) / 94 (Coolant Temp - Deg C)
3) 0 (engine RPM) / 0 (Vehicle Speed km/h) car was turned off
4) 0 (Oil Pressure) / 12.6 (Battery Voltage)
5) 0 (Inst. Fuel Consumption L/100km) / 3.0 Inst. Fuel Consumption (x 0.1 Litres)
6) 678148 (Fuel used since Trip Avg L/100km Reset - x 0.1L = 67814.8 / 356.3 (KMs travelled since Trip Avg L/100km Reset
7) 64L (Buffered Fuel Tank Level - Value used for Guage / 8.0 Buffered Fuel Tank Level Sender Resistance
8) - / 7 (Gear Position) 7=P
9) 0000 (Unknown) / 1001 (Unknown 0 apparently changes on AC Clutch Engage)
10) 0000 (Unknown) / 1111 (Unknown)
11) 0100 (Unknown) / 0000 (Unknown)
12) 0 (Unknown) / -
13) 0 (Unknown) / -
14) 0100 (Unknown) / 0
15) 1 (Unknown) / 0
16) 99 / 2010
17) 0 (Unknown) / 0
18) - / 0
19) ---d / ----

_Ben · 19-06-2012, 03:03 PM

Right, I'm currently doing the dash diagnostic.

On screen 2 (coolant temperature) I have it saying 91ish, so I assume this is fine?
On screen 4, I assume it shows both oil pressure and battery voltage? Because if so, I have 15 down the bottom left and 0 up on the top right. Does this mean my alternator could be gone?

TheSly1 · 19-06-2012, 03:17 PM

so your car is fully warm for that to be showing 91 deg?

and does the same problem happen when its cold and also when its hot?

nfi on what screen 4 means, id grab a set of multimeters and read ur alternator properly...

Mr Hardware · 19-06-2012, 03:33 PM

Ben, my AUII sits on 92deg on screen 2 when its up to operating temperature
and on screen 4 it hops between 13.9 and 14.4 all the time, depending on what i'm doing

_Ben · 19-06-2012, 03:50 PM

Quote:

Originally Posted by TheSly1

so your car is fully warm for that to be showing 91 deg?

and does the same problem happen when its cold and also when its hot?

nfi on what screen 4 means, id grab a set of multimeters and read ur alternator properly...

Misses when hot, and cold. 91 deg was when the car was at operating temperature, and I could see the temperature going up from when I first started so I think the coolant sensor is fine.

I've checked battery voltages and they seemed fine too.

TheInterceptor · 19-06-2012, 03:51 PM

They shouldnt go over 92 under normal conditions. That small number on screen 4 is the voltage, 15 sounds a bit much. Perhaps the alternator is messing with the ECU when idling due to spiking. Best to check the volts using a multimeter though.
Apart from that, perhaps you may have a vacumm leak somewhere making it misbehave at idle or maybe your ISC may need a clean since you mentioned the idle went postal when you hit neutral.

mik · 19-06-2012, 05:57 PM

Quote:

Originally Posted by _Ben

Also, because I can't edit my earlier posts:

I also heard a reasonably loud hissing sound from the intake tonight when I got home from around the TB / the 180 degree bend in the pipe. Is this normal?

i would definatly be checking out !

2002au · 19-06-2012, 06:24 PM

Could even be the intake manifold gasket.

_Ben · 19-06-2012, 06:53 PM

Quote:

Originally Posted by 2002au

Could even be the intake manifold gasket.

Tonight I tried tightening up some of the bolts on the intake manifold, and I managed to get about 1/4 of a turn. I'll try take off the intake pipe etc on my next day off and see if any of the other ones need tightening up.

blueau · 20-06-2012, 10:58 PM

+1 inlet gasket,

_Ben · 22-06-2012, 02:00 PM

So I'm still having problems.
The car's idle is now all over the place in neutral, but okay in drive. It was idling at 2000 rpm before...

I disconnected the Idle control valve and idle sorted itself out (Back the the miss, but at least it's at a normal RPM). I also disconnected the O2 sensor, and the car felt exactly the same (though I did not drive it, the car was parked). Additionally, with the TPS / the cable going to the TB disconnected the car idled like normal, just with the miss.

So I'm just not sure what can be the problem / problems.

_Ben · 05-08-2012, 08:38 PM

Bump of my old thread. Finally got around to fixing the problem, the old intake manifold gasket was in quite bad condition. Put a new one on (That was very... fun), and shes back to running well again

KIWI-1 · 05-08-2012, 08:44 PM

Quote:

Originally Posted by _Ben

Bump of my old thread. Finally got around to fixing the problem, the old intake manifold gasket was in quite bad condition. Put a new one on (That was very... fun), and shes back to running well again

Did mine last weekend. Bought the ute in January, did plugs, coil pack, leads and it improved. Was going to do intake manifold gasket one day but when I opened the bonnet two weeks ago I noticed a bolt sitting on the manifold and several others loose.

All good and using 8-8.5l/100km now.