Question about 1999 Chevrolet C1500

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Right and left bank running to lean

Replaced maf. fule filter plugs and wires still has the prob.

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  • simple_7_00 Jul 27, 2009

    yes the engine is on the codes where o2 sensor but parts store said if both come up it would be maf sensor and this is a 2001 not a 99 if it matters and thank you for your input

  • Joe Alexander
    Joe Alexander May 11, 2010

    is there an engine light on? could be the 02 sensor

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  • Master
  • 462 Answers

Things to check:

The air filter element for being restricted. An Airhog type air filter can be a problem if too much oil is sprayed on it.

MAF sensor for being installed in the proper direction and for foreign objects blocking the inlet screen.

For fuel in the pressure regulator hose. Also the fuel pressure should be tested. If its low the engine will run lean.

For excessive fuel in the crankcase. A bad injector(s) causes this.

As jaa278 said the 02 sensor(s) can be bad.

The catalytic converters should also be checked.


Posted on Jul 27, 2009

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2 Answers

Expedition 2000 idles rough, stalls, runs rich


Sounds like it is still lean & driven rich by PCM

I assume a repair shop can't resolve the issue !

That seems to be why thousands of people come
to this site & ask questions

I know the MAF is common to both banks, but you diagnose
short & long term fuel trim & perform several tests, before you
replace a MAF Sensor

Mar 05, 2013 | 2000 Ford Expedition

1 Answer

Changed both o2 sensors still rough idle and codes p2195 and p2197 still there


P2195 & 97 is a lean condition reported by both O2
on right side

The pcm drove the fuel trim lean to correct for a over
rich condition on right bank only due to a leaking fuel
injector most likely

That is a common problem on an expedition with 5.4

I have seen people find & replace the bad injector
I would mail all of them away to be ultra-sonicly cleaned
& flow tested if it were mine

If you have a professional scan tool or software you woulod
see the issue on fuel trim.

The MAF is common to both banks & you only have an issue
on the right side so the MAF is okey

Your plugs should give some indication of the bad injector
if that is the case

Need details on brakes!!

Jan 17, 2013 | 2004 Ford Expedition

2 Answers

Running lean on bank 1 and bank 2 codes 171 174 runs great when codes are off once they come on loss of power not much but you can feel it


P0171 - System Too Lean (Bank 1)

Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.

Symptoms: You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.


Causes: A code P0171 may mean that one or more of the following has happened:
* The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
* There could be a vacuum leak downstream of the MAF sensor.


Possible solutions include:
* In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
* Inspect all vacuum and PCV hoses, replace if necessary
* Check for a dirty fuel filter and proper fuel pressure


Hope helps.

Mar 24, 2011 | 2000 Chevrolet Silverado 1500

1 Answer

P0171 and P0174 Left and Right bank lean trouble codes pulled from ECU. Check Engine Light illuminated.


P0171 = system too lean bank 1
P0174 = system too lean bank 2

The fuel/air mixture is too lean for the entire engine. The fuel pump pressure could be too low. The fuel pump pressure regulator could be at fault. There could be an air leak downstream of the MAF sensor. MAF sensor (hot wire type) could be dirty. Check for intake manifold vacuum leaks. The engine coolant temp sensor and/or the intake air temp sensor could be faulty (stuck at full hot mode).

Feb 26, 2011 | 2008 Hyundai Entourage

3 Answers

CODE P0171 KEEPS ON COMING BACK ON,REPLACE O2 AND MAP


Hi Jonah,

I have the same problem and it only propped up after i had my exhaust manifold repaired, do you think the mechanic didnt do the weld it right?

James
2001 Saturn L200

Apr 27, 2010 | 2000 Saturn SL

2 Answers

Check engine codes 97 ford exp v8 codes:0358 0171 0174


P0171 and 174 System Too Lean
Basically this means that an oxygen sensor in banks 1 and 2 detected a lean condition (too much oxygen in the exhaust).

These codes may mean that one or more of the following has happened:
•The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
•There could be a vacuum leak downstream of the MAF sensor.

•In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling.
•Inspect all vacuum and PCV hoses, replace if necessary
•Check for a dirty fuel filter and proper fuel pressure

P0358 Ignition Coil H Primary/Secondary Circuit Malfunction
Code P0358 is for cylinder #8.

Inspect the spark plug, coil, and coil boot on that cylinder for signs of damage. Replace as needed.

If no problems are found with the components, check the wiring harness from the coil to the Powertrain Control Module (PCM).

Potential Causes: Failed coil or boot
Failed spark plug
Harness problem

Feb 09, 2010 | 1997 Ford Expedition

2 Answers

I have a 1997 chevy silverado putting out a code of p0174 what does this mean?


Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 2 is generally the side of the engine that doesn't have cylinder #1.

A code P0174 may mean that one or more of the following has happened:

•The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters can cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
•There could be a vacuum leak downstream of the MAF sensor.

Possible solutions include:

•In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for its location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
•Inspect all vacuum and PCV hoses, replace if necessary
•Check for a dirty fuel filter and proper fuel pressure

Jan 10, 2010 | 1999 Chevrolet Silverado 1500

4 Answers

Having problem with check engine light its showing that theirs a lean on bank 2 code P0174/P0171 what would be the cause could it be my cadaylac converter


what this codes indicates is you are running lean on both sides of the motor 171 is right side and 174 is left side.

Lean means either low fuel pressure or big vacuum leak. Since you have no cylinder misfires I would inspect the MAF sensor first. If you installed a K/N filter the oil on it could of contaminated the MAF sensor fine wires. Or you may have a air filter that is clogged.
You can clean the MAF with brake clean being careful not to break the wires.
Or inspect for a large vacuum leak that could affect both sides.
Or if all else fails have the fuel pressure checked.

14.7.1 part air to 1 part fuel is what the computer tries to maintain
.It needs this to get the best bang for the buck

A big vacuum leak or low fuel pressure will change this
If the computer sees a big vacuum leak it will add fuel until it cant anymore. This is when the code sets.
Same thing for low pressure. It will set the code because the engine stays lean for too long.

Dec 02, 2009 | 2003 Chevrolet Tahoe

1 Answer

Diagnostic computer code is (p0174) system too lean, bank 2 what does this mean?


Had the same problem with a Expedition...you can try cleaning the MAF, but also make sure your spark plugs are in good shape. The plugs on my 5.4 were all oil fouled and I had bank 1 and 2 lean codes (left and right cylinder heads)

Jul 16, 2009 | 1996 Ford F150 Regular Cab

2 Answers

My 97 buick stalls some time and wont start for while


remove maf sensor and check for air filter debris on it, gently blow off debris taking care not to damamge the wires on the sensor. also check forvaccum leaks as this can cause a lean condition

Nov 28, 2008 | 1997 Buick LeSabre

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