Author Topic: AAZ T3 smoke issues. (Read 4532 times)

g-spec · « **on:** July 14, 2008, 12:11:03 pm »

I have an AAZ with a T3 turbo, I replaced the IP already once due to a leak, and the thing smokes more than a 18-wheeler. I mean there is a trail of smoke behind the car. I have already blocked the wastegate on the turbo (17psi). The injectors are rebuilt, the IP is used but seems to be in good working order.
I want to get this issue sorted out so that I dont get another letter from the ministry about a complaint that my car smokes too much. The other thing is even when im making full boost it still smokes just as much as if it wasnt boosting.
Please let me know what I can look at.
TIA, Michal

foxracer1 · « **Reply #1 on:** July 14, 2008, 07:23:05 pm »

My T3 makes more than 20PSI if i block the gate off. Check to see if you have intake leak, dirty or clogged air cleaner, also check the fuel filter and fuel supply.

James8485 · « **Reply #2 on:** July 14, 2008, 09:31:33 pm »

i have a AAZ with a K24 so similer in size and mine smokes like a train too!
i have a valve on the wastgate and can hit 25 PSI no problem
i run it at 18-20PSI but it doesnt smoke too too much when in full boost but it does alittle which its a diesel so under full load its prob normal to have some smoke

the comment about it could be a intake leak.........like the intake manifold??? why would a leak cause excess smoke??

subsonic · « **Reply #3 on:** July 15, 2008, 12:07:13 am »

When does the smoke come on? idle and lower rpm's or full boost etc.
Where in the rpm and boost scale? Does it clear at max boost?

g-spec · « **Reply #4 on:** July 15, 2008, 12:37:30 am »

The smoke comes on as soon as im on it more than 1/4 throttle and it does not settle at all. Just keeps pumping out. I had the head rebuilt along with intake manifold cleaning 14k kms ago. Thats when I got the car with a broken TB. Ill double check the intake manifold....it being loose causes loss of air therefor the car is running rich all the time.
My sisters golf TD has the stock k14 running about 15lbs and there isnt a spec of smoke and I turned up the fuel on it aswell. You can only see a slight haze at night.
One more thing I forgot to mention....timing is set to 1.00mm tripple checked now. I was thinking the timing was off....but I keep doing it over and over again with out change. Fuel filter is new....well 14k kms, but it has been doing it since I started driving the car.
Thanks for all the replies.

Dr. Diesel · « **Reply #5 on:** July 15, 2008, 01:57:42 am »

try pulling the boost reference hose off the LDA (might as well plug it) and see if that changes anything.

foxracer1 · « **Reply #6 on:** July 15, 2008, 07:37:23 am »

Quote from: "James8485"

the comment about it could be a intake leak.........like the intake manifold??? why would a leak cause excess smoke??

Because the engine would not be recieving the air it needs to burn the fuel. A T3 should make way more than 17PSI with the wastegate blocked. So boost leaking out manifold would cause lower boost reading and less boost getting to the engine.

James8485 · « **Reply #7 on:** July 15, 2008, 08:41:23 am »

with wastegate blocked what should a K24 put out?
i hit 25-26 this low.....

i know when i put the intake mani back on a peice of my rubber boost line must have got caught and after the job was all fininshed i looked and i pinched it inbetween the head and intake i tried to pull it out but it snaped off so i assmed it would be fine but i guess not!......is there any easy way to take it off without having to take off turbo again? (intake mani)

g-spec · « **Reply #8 on:** July 16, 2008, 08:13:56 am »

Tried the boost reference hose on the LDA didnt change anything. Also checked the intake manifold and all is good. Im lost as to what it could be.
thanks for all the replies.

subsonic · « **Reply #9 on:** July 16, 2008, 09:15:32 am »

Silly question. Have you all ready tried to adjust your fuel amount?

g-spec · « **Reply #10 on:** July 16, 2008, 10:14:10 am »

Ya I have, I even replaced IP's. The one I bought still had the factory lock on the fuel screw. It smoked just as bad with the stock setting anyways.

Im going to try and cut off the exhaust and replace it with a straight pipe, due to the fart can that is on there. But I dont think this would have anything to do with the amount of smoke.

zukgod1 · « **Reply #11 on:** July 16, 2008, 10:42:35 am »

Well the only thing that will cause black smoke is excessive fuel for the amount of air you have so either you are dumping in more fuel than you think or you have a serious leak on your intake somewhere.

Back the fuel screw out until it wants to die, turn the idle up and repeat until you get a slow response on the throttle. As in when you move the lever it doesn't rev as fast, at that point turn the fuel screw back in until you get an acceptable response from the throttle lever, re adjust idle and go for a test drive. If your still getting allot of black smoke you have a problem and I'll go with a intake leak somewhere.

foxracer1 · « **Reply #12 on:** July 16, 2008, 05:07:20 pm »

Not enough fuel will also cause too much black smoke. When the pump doesn't recieve the fuel it needs it cannot advance the timming enough and emits black smoke. It may also cause the turbo not to create much boost. Check the simple stuff first.

g-spec · « **Reply #13 on:** July 17, 2008, 09:49:07 am »

What do you recommend I check? I will replace the fuel filter, injectors were rebuilt and tested. What other reasons could there be for not enought fuel? I know it could be an issue with the injection pump but I dont want to go and buy another used one and I dont have the money to get this one rebuilt.

zukgod1 · « **Reply #14 on:** July 17, 2008, 10:14:12 am »

Quote from: "foxracer1"

Not enough fuel will also cause too much black smoke. When the pump doesn't receive the fuel it needs it cannot advance the timing enough and emits black smoke. It may also cause the turbo not to create much boost. Check the simple stuff first.

True but he isn't reporting it running bad and if it was running low on fuel it wouldn't be running very well.
I'll bet 90% of the time blk smoke is due to to much fuel for the amount of air you have in the chamber.
Then there's timing, he said he's triple checked it and it's @ 1.00mm so if his gauge isn't off and the timing is really @ 1mm then there's a problem somewhere else.

I wonder if one of the injectors that was just rebuilt is sticking open allowing fuel to be injected way to early and to long? Even one cyl would cause blk smoke.

g-spec,
How does the engine sound compared to your sisters?
How about trying advancing the timing by ear till it gets loud (er) than back it down a bit, lock in in place and see what happens.
It doesn't happen very often but if your gauge is off or your TDC mark if off even just a tad it could be retarded.

To be honest last time I set in I went through all the steps and set it @ 1.05mm, started it up and DAYUM!! I thought someone has tossed in a hand full of pee gravel when I wasn't looking.
I marked the pump in that location loosened the bolts and backed it off a tad then re started, I tapped the pump until it was just a bit louder than it was before I started. locked it down and went for a ride.
All was good, that was probably 5000 miles ago now.
My point is if there is something in your pump that is worn it could be causing it to be to retarded causing your smoke issues.