Black smoke and loss of accelertaion

Tiny
M WAHAB SULTAN
  • MEMBER
  • 1989 NISSAN SUNNY
  • 1.6L
  • 4 CYL
  • FWD
  • MANUAL
I have replaced my car engine with a nissan qg16 but now when I press the car accelertor softly it doesnot acc but when I do it hard it creates black smoke please help
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Tuesday, August 4th, 2015 AT 4:32 AM

20 Replies

Tiny
KHLOW2008
  • EXPERT
Is this a carburetted or fuel injected model?
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Sunday, August 9th, 2015 AT 6:09 AM
Tiny
M WAHAB SULTAN
  • MEMBER
The car is fuel injected its a nissan qg16 engine I retro fitted it in a nissan sunnny 89 model b12
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Sunday, August 9th, 2015 AT 7:43 AM
Tiny
KHLOW2008
  • EXPERT
Are all the wiring correctly installed? Did you check for trouble codes?
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Monday, August 10th, 2015 AT 7:37 AM
Tiny
M WAHAB SULTAN
  • MEMBER
No I dont even have the grip to attach the scanner. Can u tell me reasons for this.I think as the fuel rail is retuenless and the fuel pump keeps on pumping fuel which might be the cause?
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Monday, August 10th, 2015 AT 11:04 AM
Tiny
KHLOW2008
  • EXPERT
A returnless fuel rail needs a intank fuel pump with pressure regulator otherwise the pressure would be too high at idle.
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Monday, August 10th, 2015 AT 11:13 AM
Tiny
M WAHAB SULTAN
  • MEMBER
Can I install a fuel regulator on the fuel rail or do I have to mod my tank
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Tuesday, August 11th, 2015 AT 6:20 AM
Tiny
M WAHAB SULTAN
  • MEMBER
Can I replace the fuel rail with a one with return fuel system. Like from a ga16de
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Tuesday, August 11th, 2015 AT 6:35 AM
Tiny
KHLOW2008
  • EXPERT
Yes, a fuel regulator would do but yoy must have a return line to the tank.
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Tuesday, August 11th, 2015 AT 10:28 AM
Tiny
M WAHAB SULTAN
  • MEMBER
Can I put Tomei fuel pressure regulator type s on the fuel rail entrance pipe and I do have a return back pipe plus I wanted to ask u where would the vacuum hose be attached to and do u have courses for people to teach them about cars?
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Tuesday, August 11th, 2015 AT 10:51 AM
Tiny
KHLOW2008
  • EXPERT
You can put any fuel pressure regulator as long as it can regulate correctly.

The vacuum hose can be from any part of the intake manifold after the throttle plate.

There are courses available for vehicle repairs.
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Tuesday, August 11th, 2015 AT 11:15 AM
Tiny
M WAHAB SULTAN
  • MEMBER
What if I dont attach a hose? And can u send me a link to the courses. If I change my engine which should I put in a b12? Sorry but can u also tell me should I dril a hole and weld a small pipe after the trottle plate to install a vacum hose
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Tuesday, August 11th, 2015 AT 12:07 PM
Tiny
KHLOW2008
  • EXPERT
Sorry but can u also tell me should I dril a hole and weld a small pipe after the trottle plate to install a vacum hose

Without a vacuum hose, the fuel pressure at idling would be too high and that would result in too rich a mixture.

Sorry I don't have any links for automotive courses but if you search around, you should be abkle to find one. It is best to get an acedemy or school near you place of residence as automotive repairs needs to be hands on and not via the web.

You already have the engine in, do you still want to change?

For the vacuum hose, there should be available lines that you can tap from. On the manifold you should fine at least one or 2 that is suitable. If not, you can use an adapter and tap it from the PCV hose.
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Wednesday, August 12th, 2015 AT 7:02 AM
Tiny
M WAHAB SULTAN
  • MEMBER
Can u tell me whcih port will share the vacuum port with the pressure regulator.
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Wednesday, August 12th, 2015 AT 12:53 PM
Tiny
KHLOW2008
  • EXPERT
Sorry the picture is not showing. Any port that has vacuum when engine is idling would do.
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Thursday, August 13th, 2015 AT 8:41 AM
Tiny
M WAHAB SULTAN
  • MEMBER
Sir do u have an email the pictures are not being uploaded here
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Thursday, August 13th, 2015 AT 9:46 AM
Tiny
KHLOW2008
  • EXPERT
The picture is not going to be relevant as I might not be able to know which has vacuum. You only need to find out which port has vacuum when engine is idling.
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Friday, August 14th, 2015 AT 7:06 AM
Tiny
M WAHAB SULTAN
  • MEMBER
How can I do that?
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Saturday, August 15th, 2015 AT 5:01 AM
Tiny
KHLOW2008
  • EXPERT
Start the engine and test the port for vacuum.
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Saturday, August 15th, 2015 AT 8:40 AM
Tiny
M WAHAB SULTAN
  • MEMBER
What would the vacum port do
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Friday, August 21st, 2015 AT 6:38 AM
Tiny
KHLOW2008
  • EXPERT
When the engine is running, the vacuum port would have suction.
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Sunday, August 30th, 2015 AT 6:27 AM

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