Question about 1998 Toyota Camry

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I have been geeting a check engine code stating, "lean." I have checked resistance on maf, map, ect, all w/ normal resistance. screwdriver to injectors I can feel and hear a solid clicking in each. I have replaced two of the 3 coil ignition packs. Replaced wires and plugs three months ago and fuel filter month ago. I am not getting any power out of the car. When I try to accelerate, I get a Putt putt putt sound, hesitation and it wont go above 40. I can hear an exhaust leak in the rear of engine. for a few months I have been dealing wit this. when the engine ligt comes on the car starts burning very rich and the smell becomes unbearable. I have been resetting the computer by removing the negative battery cable. then the car seems to go back to normal. however, now there is no difference even though the light is on or off. Please... Any advice would be most helpful!!!!!

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  • Toyota Master
  • 14,036 Answers

EXHAUST LEAK WILL CAUSE LEAN FUEL MIXTURE.WEAK FAULTY FUEL PUMP WILL CAUSE LEAN FUEL MIXTURE.CHECK FUEL PRESSURE SHOULD BE 44 - 50 PSI.

Posted on Sep 17, 2010

  • defence19 Sep 17, 2010

    okay, sorry to ask, but what do I use to check fuel pressure and how do I do that?

  • Jonah Oneal Sep 17, 2010

    YOU NEED A FUEL PRESSURE GAUGE.YOU HAVE TO ATTACH FUEL PRESSURE GAUGE HOSE AND CLAMPS BETWEEN THE FUEL RAIL AND THE FUEL FEED LINE.TURN ON THE IGNITION KEY.CHECK THE FUEL PRESSURE.( WARNING ) IF THIS IS YOUR FIRST TIME DOING MECHANIC WORK.TAKE TO A GARAGE.BECAUSE IT YOU GET A FUEL SPRAY IT WILL CATCH CAR AND YOU ON FIRE.YOU HAVE TO BE EXPERIENCE AND FAMILIAR WITH FUEL INJECTION SYSTEM.THEY OPERATE ON HIGH FUEL PRESSURE.

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Stalling hard start


no DTCs. (even cranked for 5second, you must crank to see them. pop up, P0340 355s etc.)
all fuses good? ever do a 60k mile tune up, ever? it repeats and is critfcal.
so you crank it.
you check spark at all cylinders, 4 to 6? (no engine stated)
got spark? you check timing with a "timing light" and its
WAY OFF, opps you skipped the new cam belt, service and if you
keep cranking it , you bend the head valves. ($$$$$$$)
ok, sparks good, and timed good.
its bad fueling?
you examine spark tips
all are wet, all are dry, or 1 or 2 are wet and others dry.
(this is called evidence)
this all assumes engine compression is at spec. 150PSI or more.

we then trouble shoot , these facts.
lean? , we check for low fuel pressure. and MAP /MAF sensor and ECT
rich? same thing, but this too high fuel pressure.

how cold is it outside. -50F or +80F in florida keys)
we check that the 2 sensors match that before first start. parked overnight.
the my both be near ambient, ECT and IAT.
scan tools allow you to see all the sensors. to see if they are fibbing.
easy.
a $9 tool.

Feb 08, 2014 | 2004 Honda Civic

1 Answer

My 2000 Honda Civic CX will not start with the Map sencer Pluged in


you meant, car will not run right (unsaid)
so i unplugged the MAP sensor (forcing limp home mode)
when was last time car had fresh fuel.
when was last time car was a daily driver?> last week, last year?
by removing the map the limphome goes huge rich state.
so id say , the engine is in a very lean state and going to limphome
hides this situation.
why not post full symptoms , with all parts back on engine.
did do the 60k mile , tune up yet? if the cam belt snaps, say good by to a good engine. (boom) Timing belt, sparks and filters.?
1: cranks ok.?
2: wont start
3: is it flooding? or starving for fuel. spark plug tips dry or wet.
if spark is good all cylinders, (no engine option stated) then
i check timing, if off the belt (cam) slipped.
if the engine is flooding i do the flooding tests.
if its to lean i do the lean tests.
ASK .
for the lean test i check the ECT , then fuel pressure.
the fuel pressure is 10 tests on a V6.
I can also test the MAP in 5min with a voltmeter, to see if its right.

here is the list ,
Good voltage 12vdc to the EFI starting and running.
Good engine, spec compression,
good spark and timed correctly if, off its the cam belt slipped,
good fueling,
there are simple tests for each.
i also make sure the EGR is not stuck open on all cars with this.
and that the ISC is not dead.(stuck and dirty)



Feb 08, 2014 | 2000 Honda Civic

1 Answer

When its very cold outside my 2003 corolla will not start just changed plugs and temp senser we can put a heat light at the firewall by the temp senser for 30 min or so and she will usally fire.


wow, no engine option stated, !!!

how cold is cold, we dont know, ALASKA -50F or Keywest at +80F

what temp sensors , there can be many.

my 08 has 3 on engine,. one in tranny, and 1 in front corner for my outside airtemp option with compass.



the one that counts is the ECT, and this sensos is screwed deep

into the waterjacket or in the thermostat housing, vastly hard to heat up by hand that. for sure heating up the thermal mass of and engine

with a heat lamp is near impossible. so where is it. EXACTLY.



are you running old fuel.?

running summer fuel?

Is CEL (MIL) lamp glowing when it does run?????





hard cold starts are caused by many things.

Just too cold is one (spend time in alaska and see)

Weak spark, check it at each

you connect scan tool, early in the morn. and see if the ECT and IAT

read near the same and near outdoor (where car is parked) temperature. if yes, he ECT and IAT are working.

once started the ECT will rise to 180F or more and hOLD; does it?

if in fact you did by change warm the ECT artifically and start easy

that means the engine is flooding.

my guess is you didnt do diagnosis at bad start time.

(spark tips soaking with fuel) leaking injectors on one or more cyl?

check all sparks for flooding, not just one,

if it is flooded, the operators guide says (RTM) top crank with the throttle held open and this cuts fuel and flood engine starts.

other causes aplenty

too high fuel pressure

leaking injectors

weak spark at any cylinder, got P030x DTC codes from scan tool?

weak compression on any cyl. (sticking valves? cold) (gage it)

if the engine is good, good compression that leaves 2 more.

weak spark (if all spark plugs are strong cranking) then....

or bad fueling,



bad fueling can be.

bad fuel

leaking injectors, (for 3 reasons)

ECU is overfueling, (ECT reads way too low than reality)

The engine has 2 more sensors that can cause over or under fueling

THE MAP or MAF, you didnt say which engine so cant guess.



MAP vacuum port clogged with PCV cloud of death , gunk,.

MAF hot wire coked up, clean it.

the maf coked will cause lean starts.

the mAP can fail 2 ways, stuck at high or low pressure.

stuck high is way more common, this causes flooding.

there are other reasons.



1: EGR main stuck open ( bad news. it floods the intake with exhaust gases and that really wrecks combution to start any engine.

2: ISC stuck closed, (flooding)



or a MAF based engine with any form of induction leaks (vacuum leaks)



i think i hit them all (hope), and there are tests for each case.

ask.

Feb 06, 2014 | 2003 Toyota Corolla

1 Answer

Engine racing


time to join the toyota death club.?.. LOL !!!!
eg; floor mats hitting throttle???? nah, nobody is that daft.
which engine options?
1.3 L M13A I4 (petrol)?
1.5 L M15A I4 (petrol)?
1.3 L I4 (diesel)?

but is ok, parked, with trans in neutral??????????
the normal RPM is about 800 hot.
not the word hot, it must be. it must be hot, 180F min. holding
hot. does it? we use a $9 scan tool to scan the ecu
and look at the ECT, does it show, 180F?
like this shows. driving dead cold the engine, warms, see it?
http://www.fixkick.com/my96-16v/TP-MAF-VSS-ECT-FUEL.JPG
the blue line, that is ECT, engine coolant temp sensor.......?
ok we got past rule one, and all fuse are good, we check.

The ECU (EFI BRAIN) in your car controls idle at all times.
GAS ENGINES, diesel we dont have here, in 2005 USA.
in your case, (hot) it does not, so can be only 2 things.
1: the ISC is messed up. (stuck open, so clean it.)
or
2: the EFI fueling is bad, causing #1.
the EFI controls might go rich or lean, and there can be air leaks in to the air intake system, (induction) on MAP engines, it races fast.
on MAF engines, it goes lean and idles slower.
i have no idea what system you have as my on line source skips 2005

what country?
is the CEL glowing key on?> check engine lamp
then stays out running>>>>>?????
do you have a maf sensor on the main air pipe? some are hidden in the throttle body. on some suz.
i believe this car is MAF based, (with map used for EGR tests only)
on very new cars, the MAF can fail, and the ECU is so smart
it can start using the MAP as backup,
or on some newer cars, it uses both , map works best at idle.
most mAF do a poor job at air flow reading at idle, (touch)
that is whats out there......
what does all this mean, simple
you start the engine, the CEL stays glowing, scan it.
you scan it and find the MAF is dead./ engine is in limphome
and in limphome mode idle controls can be DEAD>
ok CEL is out
engine hot, EFI is in CLOSED loop at idle and LTFT is like -4%
long term fuel trim. looks good, so if idle is wrong
the ISC is BUNGED

see what i did there , i used a $9 scan tool to tell me
the EFI fueling is good. so the ISC is bad.
the ISC can be 1 to 3 parts. (iac/iSC parts)
if any stick , it races. or stalls , depends on where is stuck
its just and air valve.
on MAF systems the ISC uses metered air and fuel is mixed perfect
so if it sticks open fueling is perfect and idle is RACING.
that is how EFI works. (fuel,idle, not spark)

i found what you had on the swift forum..... no lack of info there.

random page
http://www.teamswift.net/viewtopic.php?f=11&t=49725

most the questions answered this page are wrong cept last.
the maf on your car has extra capacity, so a bigger one does NOTHING. and the closed loop , will cancel the kids fiddling .
they dont understand EFI.
read

Greg Banish books to see how

all the bits work together. including how hard it is to get idle controls to
work right, its the last thing that does,,,,, work right.
ifcar has MAP total system (speed density ) most of my comments above are bunk,,,,
on SD systems, all air leaks, cause RACING ! apples and oranges different. they are...
to work efi , you need to first know what is there.....

Jan 22, 2014 | 2005 Suzuki Swift

1 Answer

I have 99 Chevy Malibu. My check engine light came on. The original codes were for a cylinder misfire and a small emissions leak. I replaced the injector for the cylinder that was misfiring as well as all...


well if you get it scanned again, and you get a lean bank 1 and 2 code then you may have a intake manifold gasket thats leaking. I just worked on a van that had them codes. and I ended up changing the intake manifold gaskets to get it to pass the emissions test for inspection, I live in new york state, po171 and p0174 are the lean codes. we did the maf sensor, new 02 sensors, egr valve and still got this lean code. good-day and god blessyou. it was on a 99 ford windstar van.

Oct 03, 2011 | 1999 Chevrolet Malibu

1 Answer

Check engine light is on. Does replacing the oil filter fix the problem? The codes are: P171, P174


very Unlikely this will have any affect. sounds more like an air leak to me.
You will find all codes available at http://www.bluejag.co.uk/decode.php



Fault Code:- P0171 Indicates a Power-train fault


The fault is generally due to a problem in the Emission Management (Fuel or Air) area


Fault Description: Bank 1 combustion too lean

Action of ECM:- ECM Default:- Bank 1 catalyst warm-up ignition ****** inhibited- Bank 1 closed loop fuel metering inhibited- Canister purge inhibited- Maximum engine speed reduced


After clearing the DTC, complete the Start engine and bring to normal operating temperature> 82 °C (180 °F) Idle for 10 minutes
Check for a reoccurrence of fault DTC.


Possible Fault:- Engine misfire Air intake leak between MAF Sensor and throttle Fuel filter / system restriction Fuel injector restriction Low fuel pump output HO2 Sensor(s) (1/1, 1/2) harness wiring condition fault Exhaust leak (before catalyst) ECM receiving incorrect signal from one or more of the following components: ECT Sensor, MAF Sensor, IAT Sensor, TP Sensor
Fault Code:- P0174 Indicates a Power-train fault


The fault is generally due to a problem in the Emission Management (Fuel or Air) area


Fault Description: Bank 2 combustion too lean

Action of ECM:- ECM Default:- Bank 2 catalyst warm-up ignition ****** inhibited- Bank 2 closed loop fuel metering inhibited- Canister purge inhibited- Maximum engine speed reduced


After clearing the DTC, complete the Start engine and bring to normal operating temperature> 82 °C (180 °F) Idle for 10 minutes
Check for a reoccurrence of fault DTC.


Possible Fault:- Engine misfire Air intake leak between MAF Sensor and throttle Fuel filter / system restriction Fuel injector restriction Low fuel pump output HO2 Sensor(s) (2/1, 2/2) harness wiring condition fault Exhaust leak (before catalyst) ECM receiving incorrect signal from one or more of the following components: ECT Sensor, MAF Sensor, IAT Sensor, TP Sensor

Sep 09, 2011 | 2004 Jaguar X-Type

2 Answers

Trouble code says fuel to lean what causes this 2000 s10 blazer 4.3


there are many different things that can give you a lean fuel mixture. you could have a bad o2 sensor, mass air flow sensor, a plugged fuel filter or dirty air filter. any of these things or combination of can cause thee type codes.

Oct 24, 2009 | 2000 Chevrolet Blazer

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.

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Oct 07, 2009 | Toyota Corolla Cars & Trucks

1 Answer

Check engine light code P0171 activated on my 2001 toyota corolla


p0171 is lean condition bank one. you could have a vacuum leak a bad map sensor bad maf sensor clogged fuel filter low fuel pressure. start with the vacuum leak first.

May 05, 2009 | 2001 Toyota Corolla

2 Answers

Check Engine light came on (2001 E320 with just 20,000 miles on it). After connecting the scanner, the code showed P0 170 and P0 173 which I was told was a Mass Air Flow (MAF) sensor problem. I...


Those codes do appear to deal with the mass airflow sensor. The MAF sensor is probably the "hot wire" type where a thin wire is suspended inside the body of the sensor and is heated with electrical current. The amount of air passing over the wire is directly proportional to the resistance of the wire and that resistance data is calculated. The MAF sensor, by itself, cannot determine the air mass supplied to the intake plenum. One or more other sensors are used in conjunction to equate these values. The oxygen sensor(s), Manifold Absolute Pressure (MAP) sensor, the Intake Air Temperature (IAT) sensors may all play a part in this fault reading.

There are reliable methods to test the MAF sensor. One well takled about method is to tap the MAF sharply with a screwdriver handle while the engine is running. If the engine dies, the MAF is faulty. This can detect a physical defect in the wire and a few other things but do do assume that, after repeated blows to the MAF with your dead blow hammer for good measure, that the MAF is at 100%. I will research some text on testing these sensors on that particular model and post links to any information and diagnostic data I find.

Jun 03, 2008 | 2001 Mercedes-Benz E-Class

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