Temporary loss of power with burst of smoke from exhaust

Black smoke (I'm guessing it's Black) is due to a air to fuel ratio imbalance, either the fuel system is delivering too much fuel into the engine or there is not enough clean air (oxygen ) a few things to look for :

Faulty injectors (injectors need attention at about 100.000 to 120 000 miles)
Faulty injector pump
Dirty air cleaner
Turbocharger or intercooler faulty
Problems within cylinder head, valves clogged up due to faulty EGR (exhaust gas recycling unit)

How many KM's has she done.? What has been the service history of above?

Joe, what colour smoke? I assume the resumption of normal power delivery and smoke happen together. If for some reason the fuel volume being injected is temporarily interupted the turbo will slow dramatically until the fuel resumes. As the fuel delivery becomes normal there will be a short period during which the turbo will have to spool up and the air fuel ratio normalises. During this brief time excess fuel will cause smoke. Sounds like you may need to get the fuel pump checked out. A short interuption of current to the fuel shutoff solinoid will give the same symptom but I can't see why this would only happen going up hills.
Hope that might help

Cheers Pop

Sounds like something got suck through the airfilter.
Might be worthwhile to see if the filter is all there.

Honky

Hi Joe,
Have the same vehicle with aftermarket turbo, had the same problem. Block of the egr hose by putting a ball bearing down rubber line and your problem should be solved This is what was recommended to me by a very reputable turbo installer and my problem was fixed. The egrs playing up is a common problem on 1HZ'S
Hope this helps
Regards
Ken

G,day had a very similar problem with my 1HZ fitted with an aftermarket[DTS] turbo . After being assured by a turbo expert that the problem was a cracked head and being relieved of many dollars ,on advice from an industry source I contacted a company who specialise in preparing competition 4 WDS and race cars within minutes of examining the car they successfully diagnosedhe problem was that the rubber elbow on the air inlet of the turbo had degraded and had expanded to over 3 times its original size.Under acceleration the elbow constricted upon itself which restricted the airflow which overloaded he air/fuel mix hence the black smoke and lack of power I also noticed a momentary increase in temperature.
Hpo that this may offer an additional suggestion

Some very good answers and possibilities to try.

The EGR or exhaust gas return valve is designed to open when it senses high pressure in the exhaust system like when the carbon particulate filter is blocked. It will then allow exhaust gases to recirculate into the air intake thus changing the air fuel mixture and creating a hotter burn for a while until the particulate filter is burnt off and the pressure in the exhaust decreases again.

I would guess this EGR is set for the normally aspirated motor exhaust pressure and when under full power with a turbo the EGR is sensing too much back pressure and opens. Of course the exhaust in not blocked and the flow soon goes through and then the EGR will quickly close again.

Two things block this EGR off - you will get more power. Second buy a 3 in mandrel bent exhaust - you will get more power and better economy.

I would also check the hoses to and from the turbo just in case they are worn as well.

To add to the upgrades buy a pyro gauge or turbo temperature gauge ($100 about) - this fits into the exhaust just after the turbo - this will tell you if you are pushing the turbo to hot and in danger of damaging your motor - if the temp gets too hot just back off a few km/h - amazing how fast the temp will change.

Cheers

Serendipity

Joe,

If none of the solutions above solve your problem might be worth floating the question on the 100 series section of the LCOOL forum.
LCOOL Forum

R & J

No one has mentioned valve clearances yet, especially yourself when describing what has been done to the/your 1HZ engine.

I have a 1997 1HZ Troopy with an after market turbo plus some other 'tricked-up' bits that works/performs sensationally, however the valve clearances which have been checked every 30,000kms after the turbo install s have had to be adjusted each time.

It has done a 130,000kms in total and the last time the valve clearances were checked approx 2mths ago I had reached the maximum point that the clearance adjustment that the shims allow for.

So next time it has to be done it will be a Head off and recon with different valves, seats etc etc - something similar to an upgrade for a petrol/LPG head.

Since the turbo was fitted I have driven the vehicle like a petrol vehicle ie not spared it one iota, towing 2.5t caravan and 1.6t camper trailer, plus heaps of desert driving with no hiccups whatsoever.

I only became aware of the vital importance of an EGT gauge half way through the many years that the turbo has been installed and got the fright of my life when I did install one.

Since I fitted the EGT gauge I now drive it to Temperature rather than Revs and its still all good. Better actually.

In a nutshell - Valve Clearances are something else to consider.

DD

Mate I had the exact same problem with mine when i bought it, three years ago. It will be the rubber elbow on the suction side of the Turbo sucking flat. I replaced mine with a 2 inch silicon bend from super cheap, problem solved. I have a DTS turbo with top mount I/C with 3 inch exhaust. When it first happened it scared the cr#p out of me.

It's Joe again,

It seems almost certain that my loss of power problems are over.

The rubber elbow into the turbo ( which I have replaced) had softened up and swelled up in size, it must have caved in when a lot of air was sucked in by the turbo.

The oily air from the tappet cover breather hose did not help either, it now breathes into a plastic oil bottle.

As I would like to install a 3inch exhaust system as suggested, I have a problem as the exhaust outlet of the turbo is only 2.5 inch. Will there be any benefit if the flow starts from a smaller outlet??

Thanks again for all the good advice so far, it's been most helpful.
Joe