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BLACK SMOKE FROM THE EXHAUST

Tiny
HABIB ADAM
  • MEMBER
  • 1999 OPEL ASTRA
  • 4 CYL
  • FWD
  • MANUAL
  • 15,000 MILES
When I start car, sometimes it cracks exessivily before it start. And when it start, it idle roughly (vibrate) and black smoke comes from the muffler during accerelation and idling. Please help me to diagnose the problem.
Thursday, March 31st, 2016 AT 2:25 AM

5 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Check fuel pressure it may be excessively high due to a failed fuel pressure regulator, this would account for black smoke (very rich) mixture.
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Saturday, April 2nd, 2016 AT 4:18 PM
Tiny
HABIB ADAM
  • MEMBER
  • 16 POSTS
Please I have checked the fuel pump and replace the fuel pressure regulator but still the problem is not solve please.
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Sunday, April 3rd, 2016 AT 2:03 AM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Pull the spark plugs and see if one more at sooted up if only one check for leaking injector
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Sunday, April 3rd, 2016 AT 3:23 AM
Tiny
HABIB ADAM
  • MEMBER
  • 16 POSTS
Please the engine is an electronic carburetor (not injectors). I have change the spark plugs too. And when I checked and all is sooted (black).
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Sunday, April 3rd, 2016 AT 8:23 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
It sounds like the choke is stuck closed, and remove the air filter to check please?
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Monday, April 4th, 2016 AT 3:08 PM

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