Question about 1996 Jeep Cherokee Country

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Bank 1 lean

Runs ruff at idol.

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I would expect a vacuum leak at inlet manifold.

Posted on May 28, 2014

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Posted on Jan 02, 2017

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SOURCE: runs rough, black smoke, computer bank 1 burning too lean

Sounds like bad injectors, bad O2 sensors, and or too much fuel psi. Check the fuel psi against what the service manual says. If the fuel psi is too high, your regulator is bad. If the fuel psi checks out ok, you likely have a bad O2 or bad fuel injector(s).

Posted on Apr 15, 2009

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1 Answer

What is the code PO133 means on 2001 chevi tracker 2.5 6 cylinders?


P0133 Heated Oxygen Sensor (HO2S) Slow Response Bank 1 Sensor 1 You Could need a new O2 sensor !
A lean-to-rich transition is indicated when the HO2S voltage changes from less than 300 mV to more than 600 mV. A rich-to-lean transition is indicated when the HO2S voltage changes from more than 600 mV to less than 300 mV. A HO2S that responds too slowly is likely to be faulty and should be replaced
This is something that needs to be checked with a scan tool or a volt meter set on millivolts . A scan tool is preferable !
How does the vehicle run ? ruff - smooth , does it have a misfire ?
P0133 O2 Slow Response 2007 Hyundai Tiburon

Mar 31, 2015 | 2001 Chevrolet Tracker

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

2005 expedition code p0171 and p0174


Code 171 is for the fuel system being too lean on bank one, and code 174 is for the same thing on bank two.
Generally the computer can not open the injectors long enough to make the system go rich.
The most common cause is low fuel pressure or a clogged fuel filter.

Aug 26, 2012 | 2005 Ford Expedition

2 Answers

I have a 98 expedition 5.4 l . after warm up runs ruff at idle. codes p0171,p0174.


P0171 - Fuel system lean bank 1
P0172- Fuel System lean bank 2

First steps- search for a vacuum leak and verify proper fuel pressure.

Mar 16, 2012 | 1998 Ford Expedition

1 Answer

2001 yukon codes causes banks 1 and 2 to run lean?


If bank one and two are running lean problem is the Mass Air Flow Sensor (MAF) Dirty or Defective.

May 20, 2010 | 2001 GMC Yukon XL

1 Answer

Ruff idle 2001 dodge stratus. changed plugs and wires and still has idle issue. throws a lean burn code bank 1 and 2. have been told it may be the cat converter?


TRY and idle your car up alittle to see if problem goes away if not then look into replacing your catolitic convertor.

Sep 12, 2009 | 2001 Dodge Stratus

2 Answers

Check engine light on,idols rough,fine at all other speeds.


It either has a vacuum leak or a dirty MAF. To test for vac leaks spray the engine with carb cleaner to see if the engine speed changes., if it does you fond the leak. The most common leak is pcv line coming straight off the back of the throttle body. Check there first. Also check to make sure there are no air leaks between the throttle body and the mass air flow. Don't replace the idle speed motor or the tps, they won't fix it. It is possible the o2 is the problem, but it usually isn't. P0107 Is usually always from the stuff i listed above.

Mar 01, 2009 | 2000 Ford Escort

3 Answers

Mass Air Flow Sensor, oxygen sensor and coil plugs


look for vacuum leaks the last 4 codes are lean codes
primarily lookm at the pcv hose noturious for collapsing

Sep 16, 2008 | 2000 Ford Expedition

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