Question about 1995-1997 Chevy 1500 Truck Ignition Starter Alarm Switch

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Black Smoke in exhaust and not idling properly

Changed idling air sensor

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GM has a problem with their fuel pressure regulators leaking . Since it is under the intake manifold, it adds extra fuel to the cyls. Also make sure the fuel pressure is within specs.

Posted on Nov 02, 2013

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Posted on Jan 02, 2017

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I changed the idle control valve still don't idel could i have a bad tps sensor


Black smoke usually means burning too much gas. The problem is the IAC idle air control. I would also replace the TPS

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1 Answer

Black smoke from exhaust


Hi Paul,
I think you're right - it sounds like you're running to RICH (too much fuel / not enough air), but I would think that you'd see the check engine light on.
If you are too rich, there's probably an O2 sensor or other computer issue going on - and if allowed to persist, you'll probably end up with a clogged catalytic converter. As long as the sensor / computer is adjusting your air : fuel ratio, there little you can do to override it. I believe the computer will continue to adjust the mixture to get what it wants to see by the O2 sensor in the exhaust.
Bring it to a mechanic / dealer to get this fixed correctly - before you waste any more fuel or cause additional problems with the cat converter or other parts.

Good luck!

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1 Answer

Mazda 3 won't idle.


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1 Answer

Lack of power and lots of smoke from exhaust


You've done a lot of work. How does your EGR valve look Its the 'space ship' gizmo under the air cleaner. Remove and decoke is a quick job and it may just cure the lot

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1 Answer

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1 Answer

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Black smoke is excessive burnt fuel. White is excessive unburnt fuel. Have your turbo checked and the air filter. Good Luck

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I had a 1995 nissan pick up with a similar problem, may want to try cleaning out or replacing the EGR valve.

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1 Answer

Running rich and blowing black smoke


Could be a number of different things.Fuel pressure relief valve not working,injector pulse too long,Is the air box lid securely fastened and air cleaner clean.Are there no leaks between the air box and throttle body(intake tube).Have you checked oxy sensor.air flow meter may be also possible.Try squeezing the flexible fuel hose enough to allow the engine to run and see if the engine reacts better if it does you have excessive fuel pressure.

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1991 V.W. jetta 2.0 16v


If you facing a little black smoke along with it your engine is running a little rich. Black smoke indicates unburned fuel and this could cause a black stain and leading to test failure

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