12ht Toyota white smoke ?

Submitted: Saturday, May 07, 2005 at 18:36
ThreadID: 22749 Views:6436 Replies:5 FollowUps:3
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I have a 1986 HJ61 Landcruiser with the 12HT engine. It has done around 250,000 kms and always been regularly serviced. I was driving it today when all of a sudden it lost power and started blowing a heap of white smoke out the exhaust. I immediately pulled over and stoppped the engine. I re-started the engine after about one minute and everything was fine again. Full power and white smoke had stopped. It has been fine since. Can anyone offer any clues on what the cause would be ? I was thinking maybe a head gasket , but why the sudden full recovery ?
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Reply By: Footloose - Saturday, May 07, 2005 at 18:52

Saturday, May 07, 2005 at 18:52
Not very helpful unfortunately, but I had the previous HJ60, not sure of the engine type, and it was still going strong at 450K. It really should of died through lack of maintainance (what's that ?:) and incorrect oil etc a long time before that. I couldn't kill it, but the rust did !
AnswerID: 110192

Reply By: ColinD - Saturday, May 07, 2005 at 19:00

Saturday, May 07, 2005 at 19:00
HI Chris, white smoke can be caused by a blocked/restricted air filter/intake (not your problem), or not enough fuel being injected into the cylinder (not black which is too much fuel). If it was not missing on one cylinder, but a general lack of power then I would suggest a restriction in the fuel line before the injector pump. There are a whole host of things that can cause this, rust-scale given the age of the vehicle might be one of the bigger contributers. Check the whole fuel suppy system from the pump right back to and including the tank.........
As you suggested water can also cause white smoke, but sounds unlikely given that it ran fine almost straight after.....
Hope its not expensive for you..........col
AnswerID: 110194

Reply By: Member - Wilgadene (QLD) - Saturday, May 07, 2005 at 19:19

Saturday, May 07, 2005 at 19:19
Had similar happen once with an 1100cc motor cycle. Turns out the oil had been overfilled at a recent service (10,000km). Once it cleared up ran like a dream, and was still going well at 130,000 when I got rid of it.
AnswerID: 110198

Reply By: Member - DOZER- Saturday, May 07, 2005 at 19:49

Saturday, May 07, 2005 at 19:49
xray vision here...but the 12ht uses a butterfly valve to stop the motor, and if it closed because of an electrical fault, white smoke would come out.....white smoke is unburnt fuel because of lack of air, (or lack of temperature to fire it)
Check out the wires and hoses to the valve on the inlet manifold...
Andrew
b4 you bag me out, walk a mile in my shoes, then your a mile away and have my shoes :)

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AnswerID: 110205

Follow Up By: Big Woody - Saturday, May 07, 2005 at 22:24

Saturday, May 07, 2005 at 22:24
I think you are spot on with your diagnosis Dozer.
There must have been some restriction in your air intake temporarily. If you've got a snorkel and something blocks the intake it will do the same thing but more likely to be electrical.

Cheers,
Brett
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FollowupID: 366782

Follow Up By: Member - DOZER- Sunday, May 08, 2005 at 13:33

Sunday, May 08, 2005 at 13:33
Lets hope that now the smokes got out....it is still ok....lol....boy those 60's are bulletproof!
Andrew
b4 you bag me out, walk a mile in my shoes, then your a mile away and have my shoes :)

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Classifieds: Bt50/Ranger Speedy grande2 18x8 alloys (x4), Landcruiser 200 series/100 series 4 alloy rims with tyres and nuts GC

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Follow Up By: ChrisO - Tuesday, May 10, 2005 at 21:14

Tuesday, May 10, 2005 at 21:14
Your X-Ray vision is working perfectly Dozer!
Thanks for your help. It does seem that the problem is electrical which is causing the butterfly valve to close over. (Happened again today several times)
The previous owner had installed a turbo timer and wired it back to this area. The connections to the wiring looks a bit dodgy. Must be shorting out and causing the valve to close.
Very much appreciate your long distance diagnosis.

Chris
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Reply By: Member - Davoe (WA) - Sunday, May 08, 2005 at 15:14

Sunday, May 08, 2005 at 15:14
Dozer is spot on as usual. White smoke is fuel starvation. I have come accross it once with a 1hz with a severly blocked primary filter. Rough running,no power, surging and heaps of white smoke. But no problems since would indicate starvation caused by other means than the filter
AnswerID: 110296

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