Black smoke...
03-16-2007, 01:56 PM
#1
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Black smoke...
So i found out my car blows black smoke at max boost (7-8psi). It blows no smoke at all (except for cold starts) other than that. I beleive this is either the oil return line not descending the whole time to the port on the engine block(stock greddy return line), or some blow by. I think it might be blow by becuse for the first time yesterday i found a little bit of oil lieing in the BOV.
How can i test this, and or fix it?
The engine is high mileage(175k) but its been rebuild around 9k miles ago.
How can i test this, and or fix it?
The engine is high mileage(175k) but its been rebuild around 9k miles ago.
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03-16-2007, 02:02 PM
#3
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Im going to be ordering a wideband soon, or so was the plan.
Just wanna make sure my engines not fucked before i put more money into it haha.
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03-16-2007, 02:14 PM
#6
As Braineack says, too much fuel.
One of the problems with the OEM ECU is that the internal map gets rich around 5500 rpm and up. So, if we compensate for boost with rising fuel pressure and a good pump as we increase boost, the ECU causes it to go way rich at higher rpm's because it increases the injector duty cycle in that area.
I think this is why Braineack was trying to change the rising rate of his AFPR in another thread.
One of the problems with the OEM ECU is that the internal map gets rich around 5500 rpm and up. So, if we compensate for boost with rising fuel pressure and a good pump as we increase boost, the ECU causes it to go way rich at higher rpm's because it increases the injector duty cycle in that area.
I think this is why Braineack was trying to change the rising rate of his AFPR in another thread.
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03-16-2007, 02:14 PM
#7
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Sometimes under like half throttle acceleration i'll get a rich spot and dump a huge plume of black smoke out the back. By super rich i mean my wideband will hit like 10.8 AFR.
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03-17-2007, 06:13 PM
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The stock pump with 1.6 injectors and vortech (greddy) afpr can supply enough for 6 psi...
There must be an explanation for the black smoke... like (earlier mentioned) a leaking bov, boost leak between turbo and intake...
Sometimes the hoses don't leak on vacuum, but on boost they will.
You should be running lean...on 7-8 psi
There must be an explanation for the black smoke... like (earlier mentioned) a leaking bov, boost leak between turbo and intake...
Sometimes the hoses don't leak on vacuum, but on boost they will.
You should be running lean...on 7-8 psi
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03-18-2007, 10:13 PM
#18
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The stock pump with 1.6 injectors and vortech (greddy) afpr can supply enough for 6 psi...
There must be an explanation for the black smoke... like (earlier mentioned) a leaking bov, boost leak between turbo and intake...
Sometimes the hoses don't leak on vacuum, but on boost they will.
You should be running lean...on 7-8 psi
There must be an explanation for the black smoke... like (earlier mentioned) a leaking bov, boost leak between turbo and intake...
Sometimes the hoses don't leak on vacuum, but on boost they will.
You should be running lean...on 7-8 psi
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03-19-2007, 12:45 PM
#19
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Again, check for vacuum leaks. You have 7-8 psi, with 1.8 injectors you should be close... Do you have a IC ??
Also , check on the rear off the intake, there is a hose barb capped. Sometimes the rubber is failling. It is used for the automatic transmission.
Also check the pvc valve if you are not venting boost into the valve cover....
Also , check on the rear off the intake, there is a hose barb capped. Sometimes the rubber is failling. It is used for the automatic transmission.
Also check the pvc valve if you are not venting boost into the valve cover....
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