Question about 2002 Chevrolet Monte Carlo

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Running lean check engine test came out, running lean. they cleaned the sensor but happened again. now can hardly drive it. took it in for the weekend to replace with new sensor.. could another serious problem be the case with the running lean code?

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Check fuel pressure and vacume leak arond intake /tbi

Posted on Jul 27, 2009


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I get code 51 on 1996 dodge caravan....fuel system lean---a lean air/fuel mixture has been indicated by an abnormally rich correction factor. The van runs fine when engine is cold but will sputter and...

the code is telling you where the problem is. Try replacing the HO2S sensors as the cpu is having trouble keeping the air /fuel mixture within limits. Check the cat converter for cracks or blockages . Have a pressure test done on the fuel manifold to check for pump/filter and pressure regulator problems. Check the ambient air temp sensor and coolant temp sensor as they also affect the air/fuel mixture.

Sep 23, 2013 | 1996 Dodge Caravan


Toyota Corolla Code P0171 Check Engine light

Code P0171 on Toyota Corolla Q: What could cause the code P0171 on 2002 Toyota Corolla? A: The code P0171 reads "System Too Lean (Bank 1)". This means that the air-fuel mixture coming in to the engine is too lean, or there is too much air and too little fuel. This could be caused by a number of reasons, such as bad airflow sensor, vacuum leaks, low fuel pressure, clogged fuel injectors, etc. To know exactly what caused the problem, your mechanic can do a few tests.
From my experience, the airflow sensor problems are fairly common; sometimes the sensor just gets dirty and gives false air flow readings causing lean condition. Again, your mechanic can test it.
If the airflow sensor is causing the lean condition, it will need to be replaced. If the sensor is just dirty, your mechanic may suggest to clean it (cleaning the airflow sensor is very delicate procedure) as a temporary solution - sometimes this could work.

on Dec 07, 2009 | Toyota Corolla Cars & Trucks

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I have a 2006 Saturn Ion 2.2 125,000 miles engine light came on then wouldnt start finally got it to start took it to auto parts store and checked it said to lean bank one i have changed fuel filter and...

Doesn't sound like you would know how to do a fuel pump pressure an flow testing , suggest you take your vehicle to a qualified repair shop that has the proper diagnostic testing equipment .
Rather then guessing an replacing parts you don't need . (fuel injector's ) Could be low fuel pressure , a bad MAP or MAF sensor. What are the fuel trims showing ? short term an long term fuel trims . Are the O2 sensor's switching normally ?

048 Engine Hard to Start or No Start Scan Data for Starting Problems
004 Fuel System Tests Start Here

Oct 29, 2017 | 2006 Saturn ION

1 Answer

1985 toyota 4runner running too lean

Maybe it's not running lean. Maybe it's misfiring. Since you put in new fuel parts and that didn't help, maybe there is an ignition component that fails when it gets hot. A bad coil can do this, also the igniter-rarely, admittedly, but you could have it tested. When it stalls and won't start, if you check for spark and find none, it would confirm an ignition problem.
I hope you find it. Post back and let us know.

Jul 29, 2012 | Toyota Cars & Trucks

1 Answer

Engine light came on took it to auto shop. they said it was a code 51

Fault Code 51 - Oxygen sensor output indicates lean too long

Power loss light: Off
Limp-in mode: Engine allowed to run rich, but prevented from running lean

Possible Causes
Bad oxygen sensor - Replace the sensor which is located on the turbo housing near the down pipe (for turbo) or on the down pipe near the exhaust manifold.

Bad connection or wiring - Check the wiring and connections between the sensor and the logic module (or SMEC). Clean and regrease any corroded connectors with dielectric grease and repair any shorts. Look for melted wire insulation near the exhaust manifold. A shorted connection to ground or any positive source will cause this fault code.

Low fuel rail pressure - See the Diagnosing Your Fuel System page.

Diagnostic Method - Trigger Parameters
- In closed-loop
- Sensor output indicates lean for more than 715 seconds (11 minutes, 55 seconds)

Results If Component Fails
A fault code 51 is stored, the circuit stays in closed-loop, and the logic module will still monitor the oxygen sensor signal. If the condition persists for four times what it took to set the code, the logic module will allow the engine to run rich, but prevent it from running lean.

Hope helps.

Mar 28, 2011 | 1996 Dodge Intrepid

1 Answer

2006 Chevrolet impala lean code issue

Unplug the sensor harness and re-connect a and c terminals using jumper wires. You should see about 4.5volts or a bit more from the center terminal (meter(+) to terminal, other lead to good ground. Do this with key on, engine off.. With engine running, (same hookup) You should see a different and varying reading that changes with rpm. Before testing check the vacuum hose going to the sensor to make sure it's intact and has vacuum or test will be invalid. Test procedure I outlined is the last one I remember. Possible GM changed procedure, so best to check a manual if readings are different than what I stated. There are other items that can change mixture but I have seen this a few times. Otherwise, you will need to go through system item by item before finding anything.

Aug 28, 2009 | 2006 Chevrolet Impala

3 Answers

99 RX300 Engine code keeps coming up lean

Check for vacuum leaks. ie, vacuum lines them selves, the rubber tube that runs from the air filter to the throttle body. If it has a plastic intake manifold, possibly the rubber port seal gaskets between it and the engine. Lean codes are set when the PCM isn't monitoring all the air coming into the engine (vac leak) or low fuel pressure.

Jun 24, 2009 | 2001 Lexus RX 300

2 Answers

Engine light on 2002 mazda protege is on even after changing o2

Try cleaning the Mass Airflow (MAF) Sensor. My 2002 Protege check engine light came on and it started stalling at stoplights if I didn't keep the engine revved a little. Manager at AutoZone checked the computer code for the light (P0171?), and it said it was running lean. He suggested I try the MAF sensor cleaner they have ($6.99) rather than replacing the 02 sensor, etc.; it made a *significant* difference. (I think I need to do it again to get it totally cleaned out, but the can is for at least 4 cleanings.) The MAF sensor is the large component that air goes through right after the air filter. If you don't have the repair manual for the car (search online for PDF's), you search for the part online to see what it looks like. Mainly, it's a tube about 4" across with some small wire things inside. The cleaner can said it was a 10 minute job; mine took 20 minutes, but only because the tube leading from the MAF sensor to whatever is next (a kind of bent elbow tube, with a couple of accordian-style ripples) tore, and I had to duct-tape that up to seal it. (Still haven't gotten that replaced - found them online for ~$40. Maybe this weekend...)

Apr 01, 2009 | 2002 Mazda Protege

1 Answer

My 2002 Chevy Blazer starts, then RPMs drop and it stalls. I take the key out, then insert it again, start it again and it runs fine. It does this intermittently - 3 times this week. Today, it did it, but...

What all did the mechanic check ? Just codes . Did the mechanic check engine sensor data paramitors ? Checks
DEFINITION: The engine runs unevenly during idle. If the condition is severe, the engine or the vehicle may shake. The engine idle speed may vary in RPM. Either condition can be severe enough to stall the engine.
Preliminary Check
Refer to Symptoms - Engine Controls .
Sensor Checks
• Check the heated oxygen sensor (HO2S).
Check for silicon contamination from fuel or from an improperly-used sealant. The sensor will have a white powdery coating. The sensor will produce a high but false signal voltage, or indicate a rich exhaust. The control module will reduce the amount of fuel delivered to the engine, causing a severe driveability problem.
• Check the throttle position (TP) sensor. If a sticking throttle shaft or binding linkage causes a high TP sensor open throttle indication, the control module will not control the idle. Monitor the TP sensor voltage. A scan tool or voltmeter should read less than 0.85 volts with the throttle closed.
• Check the engine coolant temperature (ECT) sensor using the scan tool in order to compare the engine coolant temperature with the ambient air temperature on a cold engine. If the coolant temperature reading is more than 5 degrees more than or less than the ambient air temperature on a cold engine, check for a high resistance in the coolant sensor circuit or the sensor itself.
• Check the manifold absolute pressure (MAP) sensor response and accuracy.
Fuel System Checks
• Check the fuel pressure. Refer to Fuel System Diagnosis .
• Check to determine if a rich or lean system causes the condition. Drive the vehicle at the speed of the complaint. Monitoring the fuel trim will help to identify the problem.
- Lean--The long term fuel trim is more than 150.
- Rich--The long term fuel trim is less than 115.
• Perform the fuel injector balance test. Refer to Fuel Injector Balance Test with Tech 2 .
• Check the fuel injector driver circuit.
1. Disconnect the injector harness connector at the injectors.
2. Connect an injector test lamp between the terminals of each injector connector and note the lamp while cranking.
3. If the test lamp fails to blink at any connector, the test lamp has a faulty injector drive circuit harness, connector, or terminal.
• Perform the fuel injector coil test. Refer to Fuel Injector Solenoid Coil Test .
• Check the evaporative emission (EVAP) control system.
Ignition System Checks
• Check the ignition output using the J 26792 Spark Tester or the equivalent. Refer to Distributor Ignition (DI) System Diagnosis .
• Check for the following conditions:
- Wet plugs
- Cracks
- Wear
- Improper gap
- Burned electrodes
- Blistered insulators
- Heavy deposits
• Check the spark plug wires by connecting a DMM to the ends of each wire in question. If the meter reads over 30,000 ohms, then replace the wires.
Additional Checks
• Check for vacuum leaks. Vacuum leaks can cause a higher than normal idle and low idle air control (IAC) counts.
• Check the IAC operation. Refer to Idle Air Control (IAC) System Diagnosis .
• Check the control module grounds for being clean, tight, and in their proper locations.
• Check the scan tool to determine if the control module is receiving an A/C signal. If a problem exists with the A/C ON, check the A/C system operation.
• Check for the exhaust gas recirculation (EGR) being ON while idling which will cause roughness, stalling, and hard starting.
• Check the battery cables and ground straps. The cables and straps should be clean and secure.
• Check the crankcase ventilation valve for proper operation by placing a finger over the inlet hole in the valve end several times. The valve should snap back. If the valve does not snap back, replace the valve.

Apr 18, 2017 | 2002 Chevrolet Blazer

2 Answers

96 dodge grand caravan help me please

Check MAP sensor. If PCM gets wrong data from MAP sensor it should offset ignition timing and/or make fuel mixture too lean or too rich.

Nov 05, 2008 | 1996 Dodge Grand Caravan

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