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WHY IS BOTH RIGHT BANKS RUNNING RICH ON A 4.3 V6

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Posted on Jan 02, 2017

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SOURCE: running rich, smelling rich

You may have a bad fuel injector or in need of a tune up badly. The early fuel injection (throttle body) had a single fuel injector that would clog and not spray fuel in a mist but would dump fuel. Does it run rough at idle? That is a good indicator. Some are rebuildable but I would suggest replacement. If you have not had a tune up in a while that should be done too.

Posted on Jan 24, 2010

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2 Answers

When related to an engine what bank 2 stand for?


On a V engine (V6 or V8) one side is bank 1 one is bank 2.

Jul 24, 2016 | Cars & Trucks

1 Answer

Diagnostics trouble Code P0172


code p 0172 refers to system too rich, bank 1===causes ---intake blocked , EVAP canister purge valve , fuel pressure ---EGR system---injector/s--HO2s sensor ( heated oxygen sensor in the manifold / before the cat converter of bank 1 )
eliminate blocked intake or both banks would be rich
EVAP purge valve will be giving definite other symptoms --difficulty filling, poor running after filling-- consider it after the rest
EGR will be giving codes for both banks as it feeds back into the inlet manifold---possible but save your money till last
injector --could be a leaking /faulty tip or seal at base of injector
HO2S most likely as it is affected by heat and the wires do break
First port of call
fuel pressure would affect both banks -- would not hurt to have it checked at some time
So if you are doing it yourself , I suggest the oxygen sensor first , followed by the injector/s, followed by fuel pressure ,followed by EVAP then the EGR valve

Jan 19, 2016 | 2001 Ford Escape

2 Answers

1991 Toyota Camry running rich after cleaning the throttle body and replaced the throttle positioning sensor. Checked for vacumm leaks but cant find any


92 camry failed smog because running rich. Why? - Toyota Nation ...

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Toyota Camry running rich Questions & Answers - Fixya

www.fixya.com > Forum > Tags > running rich > Cars & Trucks > Toyota
... running rich I have a 1991 Camry that is running rich. I just replaced the O2 sensor and a new cat, oil change, new spark plugs. The car wont pass smog. it is ...

1992 Toyota Camry XLE V6 Excessive Running Rich ...

? 0:21
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1992 Toyota Camry XLE V6 Excessive Running Rich ... 1997Toyota Camry V6 forward Oxygen (O2) Sensors .

Jan 11, 2016 | Toyota Cars & Trucks

1 Answer

Engine misfires. Battery dead/fixed. Po303 code: Changed plugs/wires, code cleared/reappeared. Misfiring again. Po420 code/then cleared. Po306 code. Replaced coil tower. Misfired again..


You either have a bad catalytic converter causing too much back pressure or you are running rich. I think cylinder 3 and 6 are on the same side of the engine (except opposite banks) right? Locate the fuel pressure regulator. Is it on the same side? I've seen those go bad and allow fuel to be sucked into the vacuum line causing a rich condition/ misfire on two or three cylinders on that side of the engine.

Nov 13, 2015 | 2005 Dodge Caravan

1 Answer

Cylinder misfire spark


how many miles on the odometer, mines 95k.
ah a v6, P0306 is #6 misfiring. 2.5L V6
300 is all 6 misfiring.... oops.
it is. for sure.
misfire is cause by many things, only 3 in physics, but many real world. (compression + spark +fuel rates)
i works this easy, way.
i have a full scan tool not just a code reader (near useless it)
i make sure my V6 (I have an 04) holds closed loop at idle and 2500 rpm. i f not , fix that first.
easy, it is. just look, bingo, Open loop, (out of control)
fueling is out of control.
but, first i do that tune up. in the manual, 60k , 120k, 180k, see?
do that first. , spark plugs dont last foreever nor filters.
then i replace both front 02 sensors at 100k miles. there design life.
V6 has 2 front sensors. (rear can , just sit and be ignored)
if it misfires. now, i toss a coin.
compression or fuel pressure.
i can do both in 30min flat but i toss coin lands on fuel.
i check fuel pressure and its.
60psi, fuel regulator is bad,
20psi, same, or bad pump or bad 12vdc to pump, 8v to pump is bad wiring.
one thing that helps is to find out if the engine is running too rich or too lean.
and if there are cracks in the exhuast near the 02 sensors.
i force the EFI rich and lean watching both 02 sensors in my scan tool
to see if i can force them lean or rich.
on the v6, we can introduce air leaks, to the plenum.
this will cause lean, and the o2 most react to my lean forcing
or its dead.
i can force richer, if i suspect lean or 02 shows lean, by
removing the Fuel pump regulator hose (vac) and plugging hose fast.
this causes the FPreg to go to high pressure. max.
causing RICH>
i watch the 02 and see it go rich, if not the 02 is bad or you have exhaust leaks, or dead cylinder causing the 02 to fib.
you have 2 banks, and both banks are running off 1 MAF
so you can look at both 02 sensors (front) B1S1 and B1S2
and see if both react the same. to my forcing's.

i dont think you have 3 bad cops out 6. no.
if any cylinder misfires on bank one, then bank 1 o2 goes nuts
same with the Bank 2. this can aid troubleshooting having 2 banks.
the MAF can not lie for 1 cyclinder nor one bank
the 02s can lie for each bank,
both are key to diagnosis.
let me give an example say
injector 1 leaks.
causing 301s
v6
246
135 left
this is your lay out.
my guess is its not lost compression (no test guess, mostly useless)
not 2 bad cops one on each side will cause 300s
not one bad cop. as other side would be ok.
not one bad injector.
my guess, is fuel pressure is way off.
but///???
or maf running lean (dirty, spary clean it 12inches away not close)
low fuel pressure
too high fuel pressure.

all comments are for engine with 60k mile service done,
60k, 12ok, etc.



Jan 13, 2014 | 2002 Suzuki Grand Vitara

1 Answer

It has a bad mis and running rich dark foul smelling smoke what's wrong? 1991 chevy v6 s10


possibly a faulty injector for the miss but if you have a head/headgasket problem it would account for the exhaust. Do a compression test and radiator pressure test to eliminate that area of concern

Jan 19, 2013 | Chevrolet C1500 Cars & Trucks

2 Answers

2001 pontiac grand prix. 2.8 ltr. Code says bank one sytem too rich. What could be causing the problem? It wants to die out when I take off from a stop, mostly in the mornings.


You need to get the codes,then work from a
touble chart

MAF Sensor --dirty or bad
Evap System Leaks

A rich reading,doesn't mean a rich condition,
your looking for

Have to start with codes & then start testing,
until you find something not as it should be

Jun 13, 2011 | 2001 Pontiac Grand Prix

2 Answers

Running rich, smelling rich


You may have a bad fuel injector or in need of a tune up badly. The early fuel injection (throttle body) had a single fuel injector that would clog and not spray fuel in a mist but would dump fuel. Does it run rough at idle? That is a good indicator. Some are rebuildable but I would suggest replacement. If you have not had a tune up in a while that should be done too.

Jan 24, 2010 | 1994 Pontiac Grand Prix

1 Answer

Codes indicate both banks running rich


Auto Zone plugged in and indicated Bank 1 & Bank 2 running rich.
I have a CV '96. 124 k mi.
I replaced the Mass Air Flow Sensor. $85-$110 30-40 min.
Very easy to replace with the included instructions.
All well so far. Engine Light now off.

Many just clean the contacts with contact cleaner spray.
( saw it on eHow search' mass air flow sensor' )
I opted for a new one.

Nov 16, 2009 | 1996 Ford Crown Victoria

1 Answer

1994 Chevy Astrovan. v6 . Running very rich, black smoke.


If this van uses flow meter? If does, replace it.

Jul 09, 2009 | 1994 Chevrolet Astro

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