Help Please Black Smoke
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Junior Member
Joined: Dec 2007
Posts: 11
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From: philippines
Help Please Black Smoke
Guys I live in the Philippines and am struggling for technial know how here. Can anyone please help me sort this problem out.
I have a Twin turbo 1993 burning way way too rich balck smoke on start up. Goes dead when try to accelerate hard ease off apply power evenly its still rough. Plugs thick black carbon when removed.
How can I adjust fuel mixture OR get the computer re programmed if that is the problem. Any ideas please.
Thanks Tony
I have a Twin turbo 1993 burning way way too rich balck smoke on start up. Goes dead when try to accelerate hard ease off apply power evenly its still rough. Plugs thick black carbon when removed.
How can I adjust fuel mixture OR get the computer re programmed if that is the problem. Any ideas please.
Thanks Tony
DAMN!Nice
Joined: Jun 2008
Posts: 403
Likes: 2
From: Germany
hey vet888... weīre discussing something similar in another thread at the moment. Look here:
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/hard-starting-stalling-issues-779408/page2/
Here is what I posted about injectors idle- issues. Maybe you should take a look on the other statements about adjusting idle with idle adjustment & bleeding screw, too! Because black smoke on idle is too much fuel OR to less air!
Thats why I asked if you have changed the primaries. (secondaries are not important @ idle)
But with aftermarket, it could possibly be that they have another lag-time. So maybe stock ECU canīt handle it and the injectors may stay open too long for idle. So stalling etc can occur.
Another important thing is, that you should look if the aftermarket injectors are still high impedance injectors or if they are now low impedance injectors, like most of the larger injectors (1600, 1680cc ... etc.) are.
If they are low impedance (not common on stock size(550cc prim and 850cc sec)) you have to put a resistor in row!
If impedance isnīt right too much current is needed 4 the injectors to built up the magnetic field in the injector which is needed to open against the fuel pressure.
And then either the components in the ECU are made for this current (damage to your ECU!) nor the complete circuit design isnīt made for this current so filter effects may cause aditional lag time to built up current->mag. field->open the injector --> so fuel amount doesent fit --> poor idle.
If something here isnīt right, also driving @ different boost / revs can be poorly. Not only idle!
Hopefully it is something really easy!
Because if you have a problem with the injectors... maybe this will coerce you to buy a PFC (or similar) to handle the changes!
greetings Marc
PS: a PFC is not the badest invest @ all in your situation I think, even if you could solve this problem in another way!
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/hard-starting-stalling-issues-779408/page2/
Here is what I posted about injectors idle- issues. Maybe you should take a look on the other statements about adjusting idle with idle adjustment & bleeding screw, too! Because black smoke on idle is too much fuel OR to less air!
Thats why I asked if you have changed the primaries. (secondaries are not important @ idle)
But with aftermarket, it could possibly be that they have another lag-time. So maybe stock ECU canīt handle it and the injectors may stay open too long for idle. So stalling etc can occur.
Another important thing is, that you should look if the aftermarket injectors are still high impedance injectors or if they are now low impedance injectors, like most of the larger injectors (1600, 1680cc ... etc.) are.
If they are low impedance (not common on stock size(550cc prim and 850cc sec)) you have to put a resistor in row!
If impedance isnīt right too much current is needed 4 the injectors to built up the magnetic field in the injector which is needed to open against the fuel pressure.
And then either the components in the ECU are made for this current (damage to your ECU!) nor the complete circuit design isnīt made for this current so filter effects may cause aditional lag time to built up current->mag. field->open the injector --> so fuel amount doesent fit --> poor idle.
If something here isnīt right, also driving @ different boost / revs can be poorly. Not only idle!
Hopefully it is something really easy!
Because if you have a problem with the injectors... maybe this will coerce you to buy a PFC (or similar) to handle the changes!
greetings Marc
PS: a PFC is not the badest invest @ all in your situation I think, even if you could solve this problem in another way!
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ZaqAtaq
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Sep 5, 2015 08:57 PM
