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What cause the engine to run rich and black smoke coming from tail pipe?

1989 nissian D21 the engine have 8 spark plugs when i start the engine black moke come out the tail pipe and the engine is running rich i replace new spark plugs and ingition wires but the fire is red what is causing this? can you send me a firing order on this engine? when i disconnect the wires from spark plugs the engine don't change why?

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  • 482 Answers

Hmmm sounds like the fuel pump is more of the issue as its sending too much fuel into the motor making it run rich or the gas that your using is too rich for the motor itself

Posted on Apr 22, 2017

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Posted on Jan 02, 2017

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SOURCE: 1993 TOYOTA TERCEL 1500cc Valve Seals Replaced now smokes much worse

You either have had the wrong valve seals installed, they are physically missing, or the valves are incorrect (too loose in the guides/stem too thin). The rocker arm seals will not contribute to your issue. If it did not have the oil smoke before you took the head off, the issue is with whatever the machine shop did. Valve seals have to fit TIGHT, or oil will go down the valve stem into the intake.
Take the head back to the machine shop & tell them to fix it. For free.

Posted on Sep 27, 2008

  • 295 Answers

SOURCE: running rich.

The next step is the throttle position sensor.

Posted on May 01, 2009

blueextc3221
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SOURCE: I need the firing order for the spark plugs and plug wires I recently changed them and something is not in the correct order

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Posted on May 23, 2009

  • 170 Answers

SOURCE: runs rich and miss fires

Make sure the spark plug wires are on right (propper firing order), and check the TPS sensor. Are there any exhaust leaks or vacuum leaks? Did you use the original intake manifolds and Holley throttle body? If not you need to replace the PROM chip with the one from the donor car.

Posted on Sep 20, 2009

  • 293 Answers

SOURCE: Car will not start.Engine turns over but spark plugs willnot fire

I would say replace ignition coil, that might me the problem, otherwise it can be the ecu, which might have some electrical problems not allowing the car to stay running. Good luck.

Posted on Dec 29, 2009

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Why is black smoke coming from tail pipe


It's running rich , to much gas is getting into the cylinders . Leaking fuel injectors , a fuel pressure regulator leaking , or the PCM is supplying to much fuel to compensate for a problem that it think's exists. an O2 sensor stuck lean , a bad or dirty mass air flow sensor . Is the check engine light lit ? You should take it to a repair shop an have diagnostics run on it !

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if engine is running without missfire check catyletic converter for plugging also very rich running will cause exhaust to glow but will cause alot of black smoke from tail pipe I dont reccomend driving vehicle till exhaust or rich running is fixed can lead to engine failure

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Running rich.


The next step is the throttle position sensor.

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Hello!
There are two differnt reasons for black and white smoke coming from the tail pipe.
Black smoke means fuel runs rich (car getting to much gas). Check fuel pressure/air filter.
In some cases the white smoke means car is burning oil or transmittion fluid. Have tem checked/replaced.
If you can feel a smelly smoke it can be catalytic converter.
In a worsest scenario if car blowing white smoke it can be engine coolant is getting into an engine cylinder from a bad head gasket ,or a warped/cracked head. So you need to keep your eye on coolant level and check your engine for overheat. Also might be good to check your oil for traces of coolant (on a dipstick it would be a milky substance mixture of oil and coolant).
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