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2002 ls v6 cyl 3 5 6 mifire help

2002 ls v6 just pulled the codes and got 3 5 6 misfire and too lean on bank 2

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  • Anonymous Mar 23, 2014

    Car shuts off at red light. Shakes and shutters. Check engine light will not go out. 3.0 V6 engine. Worst car I've ever had. 68,000 miles. Have spent over 1 year trouble shooting this nonsense.

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The missfire can be caused faulty leads and spark plugs replace spark plugs and leads reset codes by removing engine fuse for 10 sec road test and check codes if the lean on bank 2 comes back you may have a faulty injector or intake manifold leak try some injector cleaner in the fuel overdose it it wont hurt

Posted on Dec 30, 2008

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1 Answer

What are theses codes for 99 Chevy Prizm 171,300,302,304?


171 Sys lean bank 1 possibly o2 sensor 300, cyl misfire detected random cyl. 302 misfire cyl # 2. 304 cyl misfire cyl #4 with all 3 of these codes it might be time for new spark plugs and wires

Sep 03, 2014 | Cars & Trucks

1 Answer

System to lean bank, manufacturer control fuel air metering, cylinder misfire detected


Intake or vacum leak will be the first codes 174,171, try idle and spray propane around intake if car idles up, then intake is leaking, otherwise could be a broken vacum line, check with a gauge

Jan 18, 2014 | 2004 Hyundai Tiburon GT V6

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

05 navigator codes po012 intake " A " camshaft position over ******** bank 1 po302 random misfire po302 cyl. 2 misfire po303 cly. 3 misfire po304 cyl. 4 misfire po2195 o2 stuck lean bank 1 sensor 1 po2196...


there is nothing wrong with the timing chain position . Just a series of sensors that have gone outside the set parameters so if you check and change each one you will clear the faults.

Jan 03, 2014 | Lincoln Navigator Cars & Trucks

1 Answer

System lean bank 1 p0172 fuel


PO 171 Bank 1 too lean
PO 174 Bank 2 too lean
Why ?
The front O2 Sensors need to be replaced at
100,000 miles or sooner, if they have actually failed
They are reading too lean because the system is too
rich & the computer is driving the fuel trim or injector
pulse lean, thus the codes or failed sensors, yes both
Have to check fuel trim with a scan tool
Have to check fuel pressure
Have to check there are no leaking injectors
Have to check for Vacuum Leaks from the intake
all the way to the exhaust converter
Your working a rich condition keeping in mind the system
is driven lean
You look at fuel trim short & long,sort of a past history
of events
May want to look at converter temps also
The converters won't last long if you have or has
a rich condition from fuel or cylinder misfires
Now the spark plugs can't be over 3 years old
& no mifires,get that out of the way before working
the O2 issues

Jul 27, 2013 | 2005 Mitsubishi Endeavor

1 Answer

What's the cylinder numbers on a 2002 lincoln ls


1,2,3
4,5,6 V6

1,2,3,4
5,6,7,8, V8

front to back

#3 is third from front on pass side either motor

Spark Plug is not what causes a misfire, if you have PO303
Bad COP Coil & maybe not the same cyl as the code

Feb 15, 2013 | Cars & Trucks

1 Answer

I have a 2002 Lincoln Continental which is misfiring on spark plug #6 and running too lean on bank 2.


Bad COP Ignition Coil cylinder #6,
causing lean O2 Sensor code on
bank 2, where cyl #6 is

$70.00 at auto parts and 15 minutes to install,
one 10 mm bolt

1.2.3.4. Pass
5,6,7,8, Driver Side

Change both front O2 Sensors if
over 100,000 miles on them

Both do it yourself. Hour total time

Mar 17, 2011 | 2002 Lincoln Continental

1 Answer

2000 astro with 4.3 new plugs ,wires,cap,rotor,dist. get 2 codes misfire cyl 3 and lean fuel mix bank one


sounds like you may have a stuck closed poppet (fuel injector) inside your plenum. No fuel would cause misfire and a lean conditon. Also a vacuum leak in that cylinder would cause a misfire but yoyr spark plug would be fuel fouled.

Jul 26, 2010 | 2000 Chevrolet Astro

3 Answers

2003 Ford Ranger 4x4 extended cab- diagnostics checked and got these codes- P0171, P0174, P0300, P0316. Can you tell me what they mean?


P0171------ system too lean bank#1
Po174------ system too lean bank#2
For these 2 codes, try cleaning the maf sensor (mass air flow), that is mounted in the big black hose that goes from the air filter housing to the throttle plate, if it is dirty, that will cause those 02 sensors to send a signal to the computor to lean the air fuel mixture. If cleaning it doesn't work, the sensors will probably need changing.
P0300---- Random/multiple cylinder misfire
P0316---- Cylinder misfire at start up---- first 100 revolutions.
On those 2 codes, you have to do some testing to find out why there is a misfire.
Possible causes:
dirty/malfunctioning injectors
weak coil pack
fowling spark plugs/wires
Low fuel pressure

May 11, 2010 | 2003 Ford Ranger Regular Cab

2 Answers

98 camry engine light on w/misfires & system too lean


take sample of your fuel into clear plastic bottle from fuel line
is there any water present?
this can cause these codes and then not go on storing codes for other bank even though that bank will be missfiring also due to water & P0300 Random/Multiple Cylinder Misfire Detected being logged
check all connections to coils/leads & wiring connectors
due to miss fire codes for cyl 1,3,5 all on the same bank
also look and check for air leaks on that bank (hose knocked off or splithose)inlet manifold gasket,brake booster etc...
3 injectors being blocked slightly on same bank posible!!!
check wires and signal

was it running like this b4 tune up & repairs?
this is what codes are
P0170 Fuel Trim Malfunction (Bank 1)
P0300 Random/Multiple Cylinder Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0303 Cylinder 3 Misfire Detected
P0305 Cylinder 5 Misfire Detected

the last code is for trans due to misfire/running lean on bank 1 probably a torque problem code
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May 29, 2009 | 1998 Toyota Camry

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