Question about 1981 Yamaha XJ 650

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Runn real rich on 3 cyclenders 1 is white 3 are black?

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Please visit this site there is a lot of info on these bikes ....mine is XJ750A ' 81.

Posted on Sep 27, 2009

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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


no year, ?

try a new spark plug e and then if wires to spark plug , replace that too. and cap and rotor if it has that....?????

then when spark is good, check compression with any $20 gauge.

no year, i give up.

1976 accord? surely ive no clue.

smoke has 3 colors, (my rules not ASE)

1 black fuel (flooding etc) can seem gray but is black .

2: white and lingers., oil burning , bad. news.

3: white and fades fast, is STEAM, like moms tea pot, look next time..

smell white smoke, smells sweet, its toxic antifreeze.

smells like oil dripped on an hot exhaust? that is the smell of oil burning

smoke where, under front of car, or at the end of the tail pipe. ?????????????

how you like my smoke rules, even mom can figure it out.

Dec 13, 2013 | Honda Accord Cars & Trucks

1 Answer

Black emission coming out of the exhaust

this means you're runnning rich like the choke or egr valve is stuck on-Denny

Nov 08, 2013 | 2003 Ford Windstar

1 Answer

I have a 2012 elantra sedan. I put it into passing gear on the weekend and it produces a tremendous amount of smoke from the exhaust. I noticed on the internet that many other people have had the same...

this your fist car? never driving in this Winter conditions before?
what other cars do, or other peoples car do is not important.
what is important is your car, !
Guessing is for kids, no?

btw , any ASE certified mech can do this drunk, or blind folded,
You local dealer is where, USA< or where. ?
The real mech,, if you showed him said smoke, did you?
would know.!!

if you can not demonstrate a failure to a mech, he can not fix that.
he sees nothing. (can't fix it ,if it's not broke,.. law of universe)
Solutions. causes are easy, solutions not.

First off ,there 3 smoke types. (using DIY lingo no ASE)
1: black, that is wasted fuel.
2: white, (goes away fast, is steam) can be normal.
3: white, goes away very slow and sticks just like burning oil.
The real mech, first looks at that and can tell in 1 minute flat.
no jive !
All can. not just ASE, (unless born yesterday)

Black can be normal, only if CAT is dead.(2012 bad cat is not normal , but is on relics 1979 to about year 2000 is common)
if the CAT is not dead , then black seem. isa huge rich mixtures.
a stock car (fueling) in fact goes from 14.7:1 AFR to 12;1 AFR
AIR FUEL Ratio. and in fact goes tad rich and the CAT eats it for breakfast (turns it to carbon and heat) this happens Accelerating.
all of this is ASE training Day 1 , instructions..... easy stuff.

1: white steam is normal. on all colds starts or all the time
in very cold weather, as , all otto cycle engines convert gasloline
to energy and as a by product, water (steam) under cold weather conditions this can be seen constantly.
If you take in a car to a dealer, and it smokes white,due to CLIMATE conditions, he will say, gee that is normal.
Gee look at that car, and that one over there, see, all with steam.

but if said steam happens all them time. and smells disgustingly sweet smeel, that is ANTIFREEZE burning, this is bad news.
(cracked head/block, bad gasket or worse)

2:white not steam (slow) is burned oil.
just like getting a frying pan too hot, it smokes, white.
sniff sniff, humm.. smells just like oil dripped on a hot exhaust manifold, (try that and learn that)
that is oil burning , on a 2012 that is a sad day.
and is under warranty , why not let them fix it for free.
caused by engine damage. (see huge list)

recap;: learn to diagnose this.
(steam is normal)
burning oil, is not.
burning Antifreeze glycol , never.
with these facts you can post back with a more accurate

Oct 08, 2013 | Cars & Trucks

1 Answer

I need the wiring for the mic

Here is the wire diagram for several common mics in relation to a 4 pin CB. Most recent 4 pin CB's such as Midland, Cobra, Connex, Uniden, etc can use 4 pin mics. The wiring is actually depending on the mic rather than the CB so long as the CB's are 4 pin as well. Once you go back to late 80's the 4 pin design was a little different. Anything new it is simpler.
Stock Mic 1- Shield (Ground) 2- Yellow (Audio) 3- Red (Transmit) 4- White (Receive)
Astatic - 4 wire 1- Shield 2- White 3- Red 4- Black
static - 6 wire 1- Shield & Blue 2- White 3- Red 4- Black Yellow NC

Daiwa EM-500 Cobra CA Series 1- Shield & Black 2- Red 3- White 4- Blue
Galaxy DC-521S - 4 wire 1- Shield 2- Yellow 3- Red 4- Black
Galaxy CB-660EI 1- Shield & Black 2- White 3- Red 4- Blue
Sadelta 1- Shield 2- White 3- Brown 4- Green
Turner RK56 Road King 1- Shield & Red 2- White 3- Blue 4- Black Yellow NC
Regards, Tony

Apr 07, 2011 | Connex Radio Communications

2 Answers

Car smoke real bad when you crank it up

Sounds like you could have a leaking fuel injector or a bad fuel pressure regulator causing a rich condition at start up or possibly bad valve guide seals causing oil to leak into the combustion chamber, is the smoke blue or black when you start the engine up???

Dec 08, 2010 | 2000 Hyundai Sonata

1 Answer

Keeps stalling out and smoking in back, plus it idles real high and sometimes when giving gas it doesn't seem to go.


Jul 29, 2010 | 1999 Oldsmobile Alero

1 Answer

Rough Idle, Running rich.

Sounds like your automatic choke is giving you problems. Check to make sure the choke is operating correctly. If it ins not backing off as the engine gets to operating temp it will cause a rich condition and excessive black smoke out the tailpipe and extremely poor fuel mileage.

Feb 18, 2009 | 1984 Ford F 150

1 Answer

Laptop to TV

Have you tried this with more than one TV? It may be possible that the TV or the laptop have a faulty S-video port.

Apr 23, 2008 | Acer Aspire 5050-3242 Notebook

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