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05 corolla hesitates & P0172

All 4 plugs dark, long term fuel trim -42%, cleaned maf-reads 4.2 g/s @ idle, tip in hesitation, fuel press. 50psi, B1S1 was black on one side and white on the other - no audible exhaust leak, O2 pretty much flat line low voltage and rises (but still flat and less low) with more rpm. MAF? Comp? Cat partially clogged? HELP PLEASE!!!!

Posted by Anonymous on

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Posted on Jan 02, 2017

  • 178 Answers

SOURCE: maf?/ missfiring

have the map sensor checked to see if it is within range you say you have codes maf make sure all clamped duct work is tight and not loose clamps .iac motor clean bore if the pintle gets stuck will cause rough idle hesitation even no start conditions scan tools only test the idle air control valve motor not the bore that extends to block varnish gets built up on the pintle and in the bore wich binds the in and out operation

Posted on Sep 12, 2008

  • 15 Answers

SOURCE: 99 4runner misfire

make cranshaft gear has not spun under timing cover ive seen it happen before

Posted on Dec 31, 2008

  • 141 Answers

SOURCE: bad stumble on acceleration pops through t- body.

Sounds like the fuel pressure regulator. Could also be that the timing jumped. But I'm leaning towards the pressure regulator. Hope that I could help. Best wishes.

Posted on Jan 17, 2009

slfowler29
  • 51 Answers

SOURCE: 2001 Toyota corolla hesitates on acceleration

Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust).

Posted on Mar 27, 2009

  • 449 Answers

SOURCE: 2000 Camry,2.2 hesitating off of idle. california

Do a engine tune up this should solve the problem.

Posted on Oct 20, 2009

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P0172 05 Corolla


http://engine-codes.com/p0172_toyota.html I would replace the front O2 sensor by what I just read on your post. The site I posted will give you more info if you want.

May 11, 2014 | 2005 Toyota Corolla

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

1996 GMC Suburban w/350 surges at idle


Check engine light on ? Lean codes , fuel trims ? Causes of lean condition trouble codes P0171 P0174 GM 5 3L

Do you know what a professional type scan tool is ? What fuel trims are . How to find a lean condition ? Understanding Short Term and Long Term Fuel Trim an SD Premium video

Mar 29, 2017 | 1996 GMC Suburban

1 Answer

I have a scion tc 05 with this code p171 . what does it mean?


DTC P0171 is set when fuel trim is driven rich beyond a certain value. Possible causes are:
1. Exhaust system leak.
2. Improper fuel pressure.
3. Fuel injector restricted.
4. Defective heated oxygen sensor No. 1.
5. Defective Manifold Absolute Pressure (MAP) sensor.
6. Defective Engine Coolant Temperature (ECT) sensor.
When the air fuel ratio feedback is stable after the engine is at operating temperature and the fuel trim has reached its limit of correction to the rich side. (2 trip logic).
Feedback from the HO 2 sensor influences short-term fuel trim and short-term fuel trim influences long trim fuel trim. Short-term values are temporary and not stored when the ignition key is turned off. Long-term values are stored in memory because they are part of the basic injection duration. Long term values affect injection duration in closed and open loop because they are used to calculate basic injection duration. It is important to remember that the actual fuel trim will be the opposite of the DTC. A system too lean, DTC P0171 will mean the ECM is making a + or rich correction.
read (and let me know)above data and Freeze Frame by using (example, generic) Scan Tool on # mode 2, etc.
Slowly accelerate the engine in the increments shown and record voltage,
grams/sec of MAF and SFT, LFT, Injection Pulse, Fuel Pressure, etc.
HTH,
Vehicle have MAF Sensor?

Jan 03, 2011 | 2001 Toyota Corolla

4 Answers

2009 toyota corolla hesitates when accelerating. when acceleration in normal speeds, there is a delay of about 4-5 seconds in hesitating during acceleration. no engine lights are on at all. has about...


If you own a 2004, 2005, 2006 or 2007 Toyota Corolla and your car hesitates when you accelerate or it hesitates when driving, you should try the solution described here. Below is a list of the behavior your car may show that tells that you should try this procedure before going to a mechanic or repair shop.
  • The accelerator is slightly pressed while the car is running and it slightly jitters or hesitates
  • After completely stopping the car (a red light for example), it hesitates when you accelerate to continue driving
  • Engine power is below the usual level
  • Sometimes check engine light turns on
You should know that while those problems can be caused by several issues, including low quality or altered fuel or even a loosely tighten fuel cap, the most common cause is a dirty MAF flow meter sensor.
The MAF sensor (Mass Air Flow Meter Sensor) is in charge of detecting how much air (in mass, not volume) is coming in to the engine, so the ecm computer can calculate the amount of fuel to be injected.
Some times this sensor gets contaminated by lots of microscopic debris that scape the air filter and accumulate on its sensing parts over time. The resulting effect is that the MAF flow meter sensor gets less "sensible" and detects less air than it is currently entering the engine. The reaction of the ecm computer will be to inject less fuel to keep the air fuel balance, taking as reference the false reading of the MAF flow meter sensor. This will produce a too-lean mixture, which is responsible of the hesitation, the loss in power and the check engine light.
If your car engine, besides the hesitation, is also producing knocking or engine pinging at high loads, like when going up through a hill, it is attributed to this too-lean condition.
Before going to an auto parts store or to a mechanic to fix the problem, you should try fixing it your self. If the problem is a dirty MAF flow meter sensor, the solution is to clean it, plain and simple. That may save you some money that a mechanic will charge for cleaning it (you could do the same) or for replacing the part when most of the times it is not damaged, just dirty or contaminated

Apr 06, 2010 | 2009 Toyota Corolla

1 Answer

Rough idle hesitating at idle drives fine i


check plugs, wires, and coils for proper spark.

Oct 28, 2009 | 2002 Ford E250

7 Answers

My name is Shawn and I have a 2001 toyota corolla. I just replaced the front oxygen sensor,coolant temp sensor and new plugs. But still my engine light is coming on with a P0171 engine to lean code. What...


P0171 means Fuel Trim System Lean (Bank 1)

The MAF (Mass Air Flow) Sensor is dirty or faulty.

Note: The use of "oiled" air filters (K&N, etc.) can cause the MAF to become dirty if the filter is over-oiled

There could be a vacuum leak downstream of the MAF sensor.

If your FT is leaning it that much, I would suspect an O2 sensor or it's circuit is the problem. When that O2 sensor went to 2V, I think you found your problem. The O2S is telling the PCM that the fuel ratio is way rich, so the PCM is assigning a way lean fuel trim.

Replacing the Mass Air Flow Sensor should do the trick.

Rate this.

Oct 07, 2009 | Toyota Corolla Cars & Trucks

1 Answer

Hesitation while exceleration


Have these things checked for #1:
Spark plug
plug wire
#1 fuel injector
and the throttle position sensor, also have a fuel pressure test done, especially for the hesitation.

Aug 08, 2009 | 1996 GMC Suburban

1 Answer

95 volvo 940 DL hesitates injector error codes 113, 212, 232


Check the fuse to the injector. If it is out or got wet, it could mimic these conditions. let me know what happens. I have an 85 model.

Jan 15, 2009 | 1995 Volvo 940

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