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Boris Siljanoski
Goo Roo
Western Australia
LS400 + Soarer.

Posts: 1498
Reg: 11-2007

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Sunday, July 24, 2011 - 05:31 pm, by:  Boris Siljanoski (Z2tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi,

On Idle my car misfired when warm most of the times. When started cold it idles well, when it warms up it will start to idle lower and misfire all of a sudden.

Probably best described as a continuous bad idle

It began misfiring when I came back after a drive, If I give it a rev then it will come back to 1000rpm and idle smooth there for 3 seconds or so, then slowly work it's way down to 900, then once it reaches 750 it begins misfiring, and settles at 600 and is misfiring, not heavily but definitely not idling smooth.

Under load or accelerating and crusing it does not backfire or misfire at all.

No Signs of blown gasket or anything like that.

Oxygen sensor is new and only used for about 5000km I don't think this would make a difference to idling anyway new or old.

Map sensor vac hose is on and tight.

It's a low KM Engine (62,000), before installing I put new BKR6EIX-P plugs in. Throttle body is clean. Compression before i got it was all tested and good and even.

Car does not run a fuel pump ECU direct 12v to a aftermarket high flow pump.

Crank angle sensor isn't dirty or anything if that makes a difference.

Wiring to crank angle sensor looked good before engine went in.

No Check engine light.

I've tried starting by resetting the ECU.

Thanks.
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

Posts: 6412
Reg: 03-2006

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Sunday, July 24, 2011 - 09:18 pm, by:  Daniel Clarke (Dieseltrain) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Could be faulty coil pack connectors , or sounds like common symptoms of cracked head or blown headgasket .
Boris Siljanoski
Goo Roo
Western Australia
LS400 + Soarer.

Posts: 1499
Reg: 11-2007

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Sunday, July 24, 2011 - 10:36 pm, by:  Boris Siljanoski (Z2tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi,

Took it for another drive and was fine, Idling at 1000 RPM in Neutral if I remember correctly when fully warm after a long drive.

If it might be a cracked head is there any early symptoms i should look for but it doesn't use any water by the looks of it and radiator fluid is clean doesn't seem to smoke or anything.

The coilpack connectors looked good to me when i was putting the engine on they went on good and firm and were clean.

Anything else I should look out for while driving car etc?
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

Posts: 6415
Reg: 03-2006

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Monday, July 25, 2011 - 07:23 pm, by:  Daniel Clarke (Dieseltrain) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Maybe try and Ecu reset ? Next time it does this , maybe try the fuel pump bridge ?
Boris Siljanoski
Goo Roo
Western Australia
LS400 + Soarer.

Posts: 1500
Reg: 11-2007

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Monday, July 25, 2011 - 07:57 pm, by:  Boris Siljanoski (Z2tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi,

Does not have a fuel pump ECU, running a new 500hp fuel pump wired directly without a fuel pump ECU so don't think it's fuel pump losing power.

Will see how she goes.
Boris Siljanoski
Goo Roo
Western Australia
LS400 + Soarer.

Posts: 1501
Reg: 11-2007

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Monday, July 25, 2011 - 08:44 pm, by:  Boris Siljanoski (Z2tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi,

Went for another drive. When i came back it didn't misfire.

Another thing I noticed is at idle it behaves weirdly not misfiring, but if i give it a short rev, it will quickly go down to 500 then all of a sudden upto 1000 where it stays, give it another rev and same thing...

When warm i give it a rev and it slowly goes down to 1000, then settles at 800 or so, but doesn't do that quick bogging down to 500 then coming back up to 1000.

Could this be some sensor related problem?
Austen Menze
Goo Roo
WA
GT-TL

Posts: 1596
Reg: 07-2009

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Monday, July 25, 2011 - 08:48 pm, by:  Austen Menze (Mercyfulfate) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Clogged fuel filter?
Boris Siljanoski
Goo Roo
Western Australia
LS400 + Soarer.

Posts: 1503
Reg: 11-2007

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Tuesday, July 26, 2011 - 12:47 am, by:  Boris Siljanoski (Z2tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Fuel filters new, fuel lines also on the 1jz before I put it in looked new with no rust on the inside of connection etc.

I might try another ECU.
It's weird it didn't do it today will see next coming days when i drive it what happens.
David Patrick
Tinkerer
Queensland
soarer TT and SC400

Posts: 59
Reg: 05-2010

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Thursday, July 28, 2011 - 06:42 pm, by:  David Patrick (Treemagnet) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

what bout the idle control valve??
Boris Siljanoski
Goo Roo
Western Australia
LS400 + Soarer.

Posts: 1504
Reg: 11-2007

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Saturday, July 30, 2011 - 04:17 am, by:  Boris Siljanoski (Z2tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Was thinking it could be that, but I'm wondering, when the car is fully warm, shouldn't the idle control valve be fully shut and have no affect on it? or is there an amount the ISCV is actually still Open even at full warm to maintain a stable RPM, would anyone know about this?

Today was idling fine when warm, when I got home though idle began to drop, got down to i think 650 at one point but it did not misfire. gave it a rev to 1500 and it went down to 1000 or so and slowly to 700. I too was thinking ISCV might be playing up with the revs that drop down slowly, or is 700 the normal RPM when warm?

I was thinking maybe the rev problem and intermittent misfiring could be separate problem too?

I'm not sure what I did when I had it out, I cleaned it out on the areas that I could see, not sure if it could be taken apart by removing 3 screws like the earlier toyota ISCV's, was a while ago.
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

Posts: 6418
Reg: 03-2006

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Saturday, July 30, 2011 - 09:02 am, by:  Daniel Clarke (Dieseltrain) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

ISCV wont create a missfire issue at all, so seperate issues unfortunately .
Boris Siljanoski
Goo Roo
Western Australia
LS400 + Soarer.

Posts: 1507
Reg: 11-2007

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Saturday, July 30, 2011 - 04:56 pm, by:  Boris Siljanoski (Z2tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Yeah that's what I was thinking, as for the idle what should it normally be when cold (on say a 20-25 deg day).......... and when hot.

mine is 1000-1100 cold and either :

1000 warm
600 cold........ e.g I could come home from a drive and it's idling at 1000 warm, i turn the car off then turn it back on to drive it into the garage then its 600.... weird.

Another thing I seem to have noticed today, the engine is moving more when revved, I'm not sure if it's normal in 1j's... but I recall it hardly lifting up at all when i gave it a rev a few days ago......... today went into the engine bay and gave it a rev and you can notice the engine lifting up on the passengers side and moving toward the drivers...... also when revved from inside the whole car moves...... not heaps but small amount to be noticed. Engine mounts are new I don't think I would have snapped one driving hard to see without it being on a hoist.

Thanks to Peter Howden, I've now got the following items to try out :

Spare ECU to try replace
Spare ISCV to try replace.

Let's see what happens.
Austen Menze
Goo Roo
WA
GT-TL

Posts: 1598
Reg: 07-2009

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Saturday, July 30, 2011 - 08:17 pm, by:  Austen Menze (Mercyfulfate) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Tried a different MAP sensor?
Austen Menze
Goo Roo
WA
GT-TL

Posts: 1599
Reg: 07-2009

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Saturday, July 30, 2011 - 08:18 pm, by:  Austen Menze (Mercyfulfate) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Mine did exactly what you described after I changed heads. Sorted itself out after thrashing it like the bitch it was being.. NFI
Boris Siljanoski
Goo Roo
Western Australia
LS400 + Soarer.

Posts: 1508
Reg: 11-2007

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Saturday, July 30, 2011 - 08:25 pm, by:  Boris Siljanoski (Z2tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I haven't tried a different MAP Sensor, maybe I should get a spare one to try.

Cheers.
Michael Larcombe
TryHard
TAS
Soarer GT - TL (for sale)

Posts: 378
Reg: 08-2009

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Tuesday, August 23, 2011 - 05:17 pm, by:  Michael Larcombe (Lextcy_tas) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

How did you go with this Boris?

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