Question about 1992 Toyota Camry V6

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3.0 runs full rich black smoke so bad you cant see behind it then sometimes its ok

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Need to change the Oxygen Sensor

Posted on Sep 15, 2010

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4.0l 6 cylinder. What are the probable causes of DTC P0171?


no. (but the isc valves loves to stick but will not cause black smoke)
the 4.0L is one of 5 million made, it's well known,
the black smoke don't lie. it's rich and the cat seems burned up too.
as with black smoke the cat will try to catalyze all that and glow red hot. is your cat missing?>
so why not believe the code 171, its real and is catastrophic failure. there are 2 engines here, FED and California.(exhaust)
(2 different exhausts and sensors there.
as they say, fix what is OBVIOUSLY bad, 171
(find why using tools or inspections)
Fuel System Lean (Bank 1)in most cases the exhaust is cracked near B1S1 0xy sensor
this causes it to stick at 0volts, (lies) and the PCM sees that obvious lie then goes rich. (limphome rich)
if the pcm cant measure oxygen, it must now guess at fuel trim.(bad that.)
it goes rich, so you dont melt pistons running lean.
(by design)

bad front oxygen sensor (aka , up stream bank 1)
in calif cars, it can have a split exhaust on the I6 and have 3 sensors. (hope not yours, do look..)
most have 2 sensor, front and the useless behind cat sensor(B1s2)
S2 is useless for running mix, the rear is for smog test the cat.

so it rich, and now misfires. and the spark tips are black.
and it misfires to bad it can even idle, sure. (Drops)
the cause, is too rich.
the 171 means the PCM sees it stuck at 0v forEVER.

there are in fact other causes.
but these 2 are top cause.

on all 3 of my 4.0L engines
the exhaust manifold cracked on the under side.
side facing block. (i use a hose to ear to hear the putt putt puts, (with FULL PPE protection from burns from a dead cold engine.) ask how.
even the SST exh. man. did that.

or the header flange gasket is TOAST. (that too putts when bad.)

Aug 03, 2015 | 1996 Jeep Grand Cherokee

1 Answer

I have trouble with black smoke coming from exhaust and also revs up when at a standstill 2.7 diesel


its running rich as a pig ! (rich = black smoke , unburned fuel)
and idle screams , hot or cold or both? (engine )
no engine stated, we can fix engines unknown.
Gas , diesel, 2.5, 4.0. or bigger engines, name it.?
post the vin and we can decode that. (i can)
the vin decode is in all FSM books made. so , you can too.

rich has many causes.
from lack of tuneups (misfire causes rich)
excessive fuel pressure.
map sensor wires fell off
ECT sensor wires fell off.
thermostat stuck wide open engine never gets to full temp 180F

i can list 50 more
do you want to gue$$ or test?
your call, we cant guess what you want to do or what tools you have.

Apr 27, 2015 | Jeep Grand Cherokee Cars & Trucks

2 Answers

What cause black smoke to becoming form my suzuki grand vitara vehicle, gas engine


black smoke is a sign of an over-rich fuel mixture.

over-rich fuel mixture is caused by many conditions.

the most common of which is dirty fuel injectors (assuming your suzuki is fuel injected, most likely it is). when injectors are dirty (or partially clogged) they spray a stream instead of spraying an atomizing pattern which often causes an over-rich fuel mixture. sometimes adding fuel injector cleaner to your gas tank can fix this. then, other times a professional cleaning is required from a shop.

monthly, or so, fuel injector cleaning will usually prevent this. personally, i add fuel injector cleaner every oil change.

Jan 21, 2015 | 2007 Suzuki Grand Vitara 4WD

1 Answer

I am experiencing problems with my BMW 320i - 2004 model. It does not start easily. When it starts, a blue fuel smoke comes from the exhaust. this causes the car also to be heavy on fuel consumptio


Blue smoke is caused by oil. Rich running causes black smoke and will set the check engine light. Rich running (black smoke) on startup could be caused by a leaking injector. The blue smoke puff at startup is likely valve stem seals leaking or a bad crank case vent malfunction and sucking oil into the manifold at high vacuum conditions.

Nov 19, 2013 | BMW 320i Cars & Trucks

1 Answer

I have a 1993 chevy blazer k1500 4x4 350 5.7 truck is running too rich.I replaced the cts,trottle body,spark plugs,wires,o2 sensor and still it runs too rich sometimes you could see some black smoke from...


Back to some basics, but did you check the timing and or possible choke sticking? A little deeper (and more expensive) could be bad rings or even a leaky gasket in the intake or head.

Original motor? How many miles?

Nov 27, 2010 | 1996 Chevrolet K1500

1 Answer

Blows black smoke and runs ruff


your running rich, plugs are fouled now. can be many causes. Large vacuum leak. Bad fuel pump. Bad oxygen sensor or circuit. Bad PCM, Bad altitude sensor(MAF sensor) . make sure the pressure regulator on the fuel rail is plugged in.

Best bet is to get it diagnosed if you cant find anything unhooked.

Apr 15, 2010 | 1999 Chevrolet Blazer

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

2 Answers

Black smoke


I have to disagree with diagnosis, sorry. Black smoke is rich mixture of fuel, & blue/white is oil and/or coolant .

Dec 30, 2008 | 1988 Honda Prelude

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