Question about 1998 Mazda 626

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98 626 2.0 run idles but lungges and won't excelerate will idle. changed ecu not that

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Check the air intake boot between the air cleaner and engine. It is a black rubber, accordian looking tube. Check the accordion tube area and down in the grooves for any tears that would allow unfiltered and unmetered air into the engine. Tube can look fine just sitting there but when trying to accelerate the engine torque will allow engine to move and open up the tear causing a lunging or surging feel on acceleration but not at idle.

Posted on May 25, 2011

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Posted on Jan 02, 2017

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No power on exceleration smells like gas hs a hard time pulling hills 94 saturn sohc 1.9


Start by replacing the air filter and checking the operation of the fuel pressure regulator. Have the stored codes read out of your ECU, either by an auto parts store or a local mechanic, in order to ascertain a starting point for diagnosis.

May 08, 2015 | Saturn Cars & Trucks

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Bad fuel economy and lumpy idling - possibly causes


<p><b><u><span>Excessive fuel consumption and 'lumpy' idling engine</span></u></b><br /> <p><b><span>Possible faults:-</span></b><br /> <p><b><u><br /></u></b><br /> <p><b><u><span>Coolant sensor </span></u></b><span><span> </span>- engine is signaled as being 'cold' all the time, not just at start up, causing ECU to set longer injection cycle </span><br /> <p><span><span>&oslash;<span> </span></span></span><span>Low coolant level can prevent sensor being able to detect coolant temperature</span><br /> <p><span><span>&oslash;<span> </span></span></span><span>Faulty 'open' thermostat allows coolant to circulate without regulation and perhaps prevents the engine from achieving normal running temperatures.</span><br /> <p><span> </span><br /> <p><b><u><span>FPR</span></u></b><span> - broken diaphragm allows fuel to enter the vacuum line and then into the inlet manifold. Additional source of fuel makes the fuel air mix richer causing a faster and lumpy idle.</span><br /> <p><span> </span><br /> <p><b><u><span>Vacuum leak </span></u></b><span>- 'high oxygen' signal from O2 sensor causes ECU to set longer injection cycle.</span><br /> <p><span> </span><br /> <p><b><u><span>O2 sensor</span></u></b><span> - 'high oxygen' sensor error causes ECU to set longer fuel injection cycle</span><br /> <p><span> </span><br /> <p><b><u><span>MAF</span></u></b><span> - 'over reads' in error the amount of air entering causing ECU to set longer fuel injection cycle </span><br /> <p><span> </span><br /> <p><b><u><span>IAT</span></u></b><span> - 'under reads' in error the temperature of incoming air causing ECU to set longer fuel injection cycle</span><br /> <p><span> </span><br />

on Jul 22, 2011 | Mercedes-Benz E-Class Cars & Trucks

1 Answer

Runs rough dies


change the fuel filter and check the fuel pressure

May 25, 2013 | Ford Expedition Cars & Trucks

2 Answers

2002 jeep grand Cherokee change batt. Now it starts but won't run?


Because you disconnected the battery you lost the long trim value,you will now have to relearn the idle,start the vehicle idle it to 1500 RPM,hold for a minute,idle should stabilize,turn on A/C let it idle,for a minute,now your done,

Aug 19, 2012 | 2002 Jeep Grand Cherokee

1 Answer

My 05 chevy malibu is not excelerating or shifting properly...


I would test both the tps and map sensors.
map sensor is here:

0996b43f802030b8-etlvqcyxjdbbokifzikh1c5u-5-0.gif

Testing

Check the Manifold Absolute Pressure (MAP) sensor circuit as follows:
Ignition OFF, disconnect the MAP harness connector at the MAP sensor.Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit terminal 2 and ground.If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.Verify the scan tool MAP Sensor parameter is less than 1 kPa.If greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the ECM.Install a 3A fused jumper wire between the signal circuit terminal 3 and the 5-volt reference circuit terminal 1. Verify the scan tool MAP Sensor parameter is greater than 126 kPa.If less than the specified range, test the signal circuit terminal 3 for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.If all circuits test normal, test or replace the MAP sensor.

0996b43f802030bb-etlvqcyxjdbbokifzikh1c5u-5-2.gif


Check the Throttle Position (TP) sensor circuits as follows:
Ignition OFF, disconnect the harness connector at the throttle body.Ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the low reference circuit terminal C and ground.If greater than 5 ohms, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. Ignition ON, test for 4.8-5.2 volts between 5-volt reference circuit terminal E and ground.If less than 4.8 volts, test 5-volt reference circuit for a short to ground or an open / high resistance. If the circuit tests normal, replace the ECM.If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM. Verify the scan tool TP sensor 1 voltage is less than 0.1 volt.If greater than 0.1 volt, test the signal circuit terminal D for a short to voltage. If the circuit tests normal, replace the ECM. Verify the scan tool TP sensor 2 voltage is greater than 4.8 volts.If less than 4.8 volts, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM. Install a 3A fused jumper wire between the signal circuit terminal D and the 5-volt reference circuit terminal E of the TP sensor 1. Verify the TP sensor 1 voltage is greater than 4.8 volts.If less than 4.8 volts, test the TP sensor 1 signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. Install a 3A fused jumper wire between the signal circuit terminal F and the low reference circuit terminal C of the TP sensor 2. Verify that the TP sensor 2 voltage is less than 0.1 voltIf greater than 1.0 volt, test the TP sensor 2 signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM. Ignition OFF for 90 seconds, disconnect the harness connector at the ECM.Test for less than 5 ohms of resistance on all TP sensor circuits between the following terminals:ECM C2 signal circuit terminal 65 to TP terminal DECM C2 signal circuit terminal 63 to TP terminal FECM C2 5-volt reference circuit terminal 3 to terminal E If greater than 5 ohms, repair the affected circuit for open/high resistance.Test for infinite resistance between TP sensor 1 signal circuit terminal D and TP sensor signal circuit terminal F.If less than infinite resistance, repair the short between TP sensor 1 signal circuit and TP sensor 2 signal circuit. If all circuits test normal, replace the throttle body.

0996b43f802030be-etlvqcyxjdbbokifzikh1c5u-5-5.gif
Fig. Throttle Actuator Control electrical connector


Throttle Body Relearn Procedure
NOTE
Do NOT perform this procedure if DTCs are set.

Start and idle the engine in PARK for 3 minutes.With a scan tool, monitor desired and actual RPM.The ECM will start to learn the new idle cells and Desired RPM should start to decrease.Ignition OFF for 60 seconds.Start and idle the engine in PARK for 3 minutes.After the 3 minute run time the engine should be idling normal.
NOTE
During the drive cycle the check engine light may come on with idle speed DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn.

If the engine idle speed has not been learned the vehicle will need to be driven at speeds above 70 km/h (44 mph) with several decelerations and extended idles.
After the drive cycle, the engine should be idling normally.

If the engine idle speed has not been learned, turn OFF the ignition for 60 seconds and repeat step 6.Once the engine speed has returned to normal, clear DTCs.

Jul 29, 2017 | 2005 Chevrolet Malibu

2 Answers

I have a 1993 300zx twin turbo that's heavily


you are SURE you have enough fuel pressure? like 60?

Feb 19, 2012 | 1993 Nissan 300ZX

2 Answers

Replaced mass air flow sensor, fuel filter, air filter, plugs, wires, cap and rotor. Truck would not go past 2500 RPM before I installed new maf sensor. Now it wont idle when stopped. Runs fine down the...


Make sure there are no vacuum leaks around the mass air flow sensor. If it won't idle when stopped, change the Idle Air Control Valve. Reset the ECU module by removing the negative battery terminal and leave it aside for ten minutes and then reconnect it.

Jun 23, 2011 | 1997 Nissan Pickup

2 Answers

'03 Toyota Corolla 1,4 VVT-i 4ZZ engine idle rpm


Idle is factory set and cannot be adjusted, your best bet is checking for cracked hose pipework for air intake at idle,(not at problem under exceleration and driving) Any slight upset to the air /fuel ratio will be most prevelent at idle speeds.Check hoses where the meet metal flanges on manifold intakes and any sharp bends in ppipes.Good luck

Apr 05, 2010 | 2003 Toyota Corolla

2 Answers

Jaguar xj6 4.0 1990. showing fault code fuel 14, fail 14. what does this code mean ?


2 airflow sensor out of operating range 3 coolant temp sensor out of operating range 4 oxy sensor indicates full rich 5 throttle potentiometer/airflow sensor... (low throttle pot signal with high airflow sensor signal) 6 throttle pot/airflow sensor...... (high throttle pot signal with low airflow sensor signal) 7 throttle pot...idle fuel adjustment failure(idle speed??) 8 intake air temp sensor...open or shorted circuit to sensor 11 Throttle pot at idle: Throttle pot idle trim out of normal range 12 Airflow meter: MAF signal out of range 14 Coolant thermistor: Resistance out of range or static during engine warm up 16 Air thermistor: Resistance out of range 17 Throttle pot: Out of range 18 Throttle pot/Airflow: Low throttle pot signal at high airflow 19 Throttle pot/Airflow: High throttle pot signal at low airflow 22 Fuel pump drive: ECU output to fuel pump relay 23 Fuel supply: Engine running too rich 24 Ignition Drive: ECU output to ignition Amp 26 Air leak: Engine running too lean 29 ECU self check 33 Injector Drive: ECU output to injectors 34 Injector: Looks for Injector dribble 37 EGR Drive: ECU output to EGR switching valve 39 EGR check sensor: EGR not working (normally pipe blocked) 44 Lambda (O2) sensor: Poor mixture control rich or weak (or misfire) 46 Idle speed Control valve: ECU output to Coil AB 47 Idle speed Control valve: ECU output to Coil CD 48 Idle Speed Control Valve: Stepper motor grossly out of position 66 Air pump: ECU output to air pump relay 68 Road speed sensor: Seen speed < 5km/h at high engine airflow 69 Drive/Neutral switch: Seen cranking in "D" or high airflow in "N" 89 Purge Valve drive: ECU output to purge valve
this is all I could find

Nov 09, 2009 | 1990 Jaguar XJ6

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