Question about Chevrolet 1500

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1996 1500 5.7 running way to rich, blowing black smoke,missing at a idle think we narrowed it down to o2 senser. not to sure

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  • bugg1rl579 Jul 24, 2009

    it said that the fuel was to rich, had a misfire problem and some other sesnser and problems. My machanic said it all can be related to the 02 sensor so well start with that. The main thing that concerns me is they redid the heads and tranny theres wires are loose and very unorginized

  • bugg1rl579 Jul 24, 2009

    thanks, if any more info keep me updated, buy the way i never talked to him about the injectors

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WHAT TROUBLE CODES DO U HAVE? WHAT IS THE FUEL PRESSURE? HAVE U DONE AN INJECTOR LEAK/FLOW TEST?

Posted on Jul 24, 2009

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Why does my 1988 ford ranger 2.0L is running rough and missing and blowing black smoke


Sounds like it is running rich, could be a stuck injector or a bad water temperature sensor. Is the check engine light on?

Jul 26, 2014 | 1988 Ford Ranger

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Trac Off light and Cooling Fan running on my 2001 Chevy Cavalier


I had the same problem on my 2001 Sunfire (same car as the Cavalier-different branding) which I was able to fix successfully.

My symptoms were:
-Traction Control OFF light illuminated
-Cooling fan running even if engine cold and it was freezing outside (I also noticed that when the Traction light illuminated, the fan would then begin)
-Rough idle with black smoke when cold
-Poor fuel economy


I have a code reader which produced codes P0130 and P0171. These are error codes for the upstream oxygen sensor (the one under the hood).

I simply replaced the O2 sensor (it took me 10 minutes). I did not reset the check engine light after the repair as I wanted to see what the car would do on its own. The idle was much smoother with no smoke and the cooling fan stopped running unnecessarily. After 1/2 mile down the road, the Trac light went away and the system functioned normally. I tested this by trying to accelerate quickly up a snowy driveway. I also noticed that the acceleration and shifting (auto tranny) were smoother. I reset the check engine light. All is satisfactory.


What was happening to the car before the repair:

P0130 is usually for a bad O2 sensor and P0171 is the sensor detected that the motor was running too lean (but it actually wasn't-the sensor was essentially giving a false lean signal).
The rough idle, black smoke, and poor economy are due to running too rich. In my case, the sensor told the PCM (the car's computer) that the air/fuel mixture was too lean. In response, the computer said "OK, more gas!" That's why it ran rich. This was evidenced on the old O2 sensor as well...it was completely caked with carbon from an excessively rich mixture. This further destroyed the performance of the O2 sensor.

Nov 04, 2013 | 2001 Chevrolet Cavalier

1 Answer

High to low rpms


There may be a problem with the idle air control circuit. Make sure that the throttle body and idle air passages are clean. If not, you may have to do a throttle body cleaning on it. You can follow the directions on the can, but you will have to make sure that you give it a few shots with the throttle plate closed, so that the cleaner can get into the idle air passages. Also, make sure that there are no vacuum leaks and there is not any un-metered air that is entering into the intake. If the exhaust is blowing out and blue smoke, then the piston rings may be worn or stuck and the combustion chamber all carbon built up. If it blows out black smoke, then it's running too rich.

Jul 05, 2013 | Cars & Trucks

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!

Jul 01, 2013 | Cars & Trucks

1 Answer

Check engine light is on, emmissions said o2 sensor out replaced sensor replaced plugs,rotor ,cap and wires still idels rough and floods


95 16v ?
what DTC, post DTC? why skip that,... there are many 02 DTC.
most fail for heater, dead,
lets play a game. say;
1: CEL out running, is it , now?
2: you did the 60k by the book, did you? if not why not?
3: checked spark timing, its good, not way off, is it?
the 60k requires a new Timing belt, ever check that, or the timing of the cam? or compression, if not why not.?
no motor can run right with all or any of those stated items bad.
is the fuel filter packed up. 60k.
lets now pretend the 60k was done and done right.
click 60k here
http://www.fixkick.com/IGN_timing/tune-ups.html

"what can make my 95 very rich?,"
Ill pretend it's a MPI 16v engine, not TBI. big differences that.
The 16v has 4 injectors, quad trouble !
rich? you never said under what conditions, hot or cold?
ill pretend, its all the time. rich. not just cold or hot.
1: engine never reaches 180F and holds there (miniumum)
does it? if not it will run rich forever. the ECU thinks its cold all the time and guess what it is.
2: Exhaust cracks, near the 02 sensors, making said sensor useless (new or old)
3: fuel pressure not near 30psi ($20 gage) found at 60. opps. bad.
4: leaking injectors.
5: clogged injectors, (seems odd but is true) ask.(complex)
there is an order to finding this.
ask for detailed help here, totally free.
http://www.fixkick.com/bbs2/Suzuki-bbs/

Feb 18, 2013 | 1995 Geo Tracker

1 Answer

I have a jaguar x-type 2.0d. Sometimes when revving the engine hard, black smoke is blowing out the exhaust quite thickly. I think it might be the turbo. Can anybody shed any light on this for me?


Black smoke is usually carbon, blue oil, and white is steam. I would guess your car has a bad O2 sensor and has been running rich for quite a while.

Apr 28, 2009 | 2004 Jaguar X-Type

1 Answer

RUNNING RICH AND MISSES,IT SMOKES BLACK


check your spark plug wires to make sure they are in the correct firing order, thats what it seems like the problem is

Apr 18, 2009 | 1993 Toyota Pickup

1 Answer

Exhaust blows black on ford explorer


look for a vacume leak. black smoke means it is running very rich

Mar 17, 2009 | 1992 Ford Explorer

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