Hello House,

My Corolla Sport normally exhibit cold start (it takes time to start). I met my Mechanic and he confirmed that the problem is the fuel pump. He stated that the pressure from the pump is weak and it’s not pumping the right amount of fuel into the car thus the slow start.

I have since changed the fuel pump and the problem has kind of manifested in another way. Now, the car will start and then go off, I will need to press the accelerator to pump in fuel before it can finally start. And if I lift pressure from the accelerator too soon, the car will go off.

Please enlighten me on what could be the cause. I don’t want to waste any money on what might not be the problem.

Thank you

When u depress the accelerator, you are opening the throttle for air to come in, not fuel.

The computer only sends more fuel to balance the air !!!

So you have a problem with air flow!

Culprit: Air Flow Box (meter)

What brand of OBD2 reader do you have? �

makavele:
When u depress the accelerator, you are opening the throttle for air to come in, not fuel.

The computer only sends more fuel to balance the air !!!

So you have a problem with air flow!

Culprit: Air Flow Box (meter)

Oh, okay. Thank you. At least I have a clue now

EgunMogaji:
What brand of OBD2 reader do you have? �

I don’t have any

Run a scan. Though your pcm might not be stored with any fault error relating to this. Carry out an extensive engine tune up. Also check idle air control valve

topsy509:


I don’t have any

I suspected as such.

Any modern car owner needs to have a reader as part of his tool. Most, not all, of these issues can be troubleshooted at leisure if you have your own reader.

Some issues may manifest itself sporadically and clear up without storing a code. I suspect a throttle position sensor.

https://www.amazon.com/ScanGauge-Automotive-Computer-Customizable-Real-Time/dp/B000AAMY86/ref=sr_1_1?ie=UTF8&qid=1517419683&sr=8-1&keywords=scangauge

https://ultra-gauge.com/ultragauge/ultragauge_wired.htm?gclid=CjwKCAiA78XTBRBiEiwAGv7EKhs_DZBmLLPKH3XUH_jV8CAWsgdgwsgZ_j4Qe5j1YHuUpxxnYBDDrxoCvUYQAvD_BwE

++++++++++++++++

The UltraGauge EM Plus & UltraGauge MX can display 78+ possible standardized gauges*. Gauge selection is completely customizable. The actual gauges available are vehicle dependent. If your vehicle supports any of the gauges listed, then the gauge will be available for display by UltraGauge.

The Ultragauge EM Plus does not support Manufacturer specific gauges such as Transmission temperature, the Ultragauge MX does. Please see the MX product page for more information.

Gauge
% Engine Load
Engine Coolant Temperature (ºF)
Engine Coolant Temperature (ºC)
Short Term Fuel Trim Bank 1
Long Term Fuel Trim Bank 1
Short Term Fuel Trim Bank 2
Long Term Fuel Trim Bank 2
Fuel Pressure (PSI)
Fuel Pressure (kPa)
Intake Manifold Absolute Pressure (MAP)(PSI)
Intake Manifold Absolute Pressure (MAP)(kPa)
RPM
MPH
KPH
Timing Advance
Intake Air Temperature (ºF)
Intake Air Temperature (ºC)
Mass Air Flow Sensor 1 (g/s)
Absolute Throttle Position 1 %
Bank 1 0xygen Sensor 1 Voltage***
Bank 1 0xygen Sensor 2 Voltage***
Bank 2 0xygen Sensor 1 Voltage***
Bank 2 0xygen Sensor 2 Voltage***
Run time since last start (hours:mins)
Miles traveled with Check Engine Light On.
Kilometers traveled with Check Engine Light On.
Fuel Pressure (Diesel & Direct Injection) (PSI)
Fuel Pressure (Diesel & Direct Injection) (10kPa)

Bank 1 Wide 0xygen Sensor 1 Lambda (voltage based)***
Bank 1 Wide Oxygen Sensor 2 Lambda (voltage based)(UG Plus & UG MX only)***
Bank 2 Wide 0xygen Sensor 1 Lambda (voltage based)***
Bank 2 Wide Oxygen Sensor 2 Lambda (voltage based)(UG Plus & UG MX only)***

Bank 1 Wide 0xygen Sensor 1 Lambda (current based)(UG Plus & UG MX only)***
Bank 1 Wide Oxygen Sensor 2 Lambda (current based)(UG Plus & UG MX only)***
Bank 2 Wide 0xygen Sensor 1 Lambda (current based)(UG Plus & UG MX only)***
Bank 2 Wide Oxygen Sensor 2 Lambda (current based)(UG Plus & UG MX only)***

EGR Flow %
EGR Flow % Error
Evaporative Purge %
Fuel Level % of full
Number of Warm-ups since Check Engine Light Cleared
Miles traveled since Check Engine Light Cleared
Kilometers traveled since Check Engine Light Cleared
Evaporative System (PSI)
Evaporative System (Pa)
Barometric Pressure – Inches of Mercury (inHg)
Barometric Pressure – Inches of Mercury (kPa)
Catalytic Converter Bank 1 Sensor 1 Temperature (ºF)
Catalytic Converter Bank 1 Sensor 1 Temperature (ºC)
Catalytic Converter Bank 2 Sensor 1 Temperature (ºF)
Catalytic Converter Bank 2 Sensor 1 Temperature (ºC)
Catalytic Converter Bank 1 Sensor 2 Temperature (ºF)
Catalytic Converter Bank 1 Sensor 2 Temperature (ºC)
Catalytic Converter Bank 2 Sensor 2 Temperature (ºF)
Catalytic Converter Bank 2 Sensor 2 Temperature (ºC)
Battery Voltage (Measured by ECM)
UltraGauge Battery Voltage (Measured by UG)
Load absolute %
AFR Commanded Ratio
Relative Throttle Position %
Outside Ambient Air Temperature (ºF)
Outside Ambient Air Temperature (ºC)
Absolute Throttle Position 2 %
Accelerator Pedal Position 1 %
Accelerator Pedal Position 2 %
Command Throttle Position %
Boost Pressure, (Relative Pressure) (PSI)
Boost Pressure, (Relative Pressure) (kPa)
Brake Horsepower 1
Brake Kilowatts 1
Torque 1 (ft lbs)
Torque 1 (N.m)
Brake Horsepower 2
Brake Kilowatts 2
Torque 2 (ft lbs)
Torque 2 (N.m)
Mass Air Flow Sensor 2 (g/s)– Calculated
Instantaneous MPG
Instantaneous KPL
Instantaneous L/100Km
Average MPG – General
Average KPL – General
Average L/100Km – General
Average MPH – General
Average KPH – General
Run Time – General
Miles – General (miles)
Kilometers – General (miles)
Fuel Used – General (gallons)
Fuel Used – General (liters)
Average Gallons/Hour - General
Average Liters/Hour - General
Fuel Level (gallons)
Fuel Level (liters)
Instantaneous Gallons/hour
Instantaneous Liters/hour
Distance to Empty (miles)
Distance to Empty (kilometers)
Time to Empty
Volumetric Efficiency (MAP vehicles only)


General Trip Gauges
Average MPG
Fuel Used
Average Gallons/hour
Average MPH
Distance (miles)
Run Time

Average KPH
Average KPL
Average L/100Km
Liters Used
Average Liters/Hour
Distance (kilometers)


Short Trip Gauges**
Average MPG
Fuel Used
Average Gallons/hour
Average MPH
Distance (miles)
Run Time

Average KPH
Average KPL
Average L/100Km
Liters Used
Average Liters/Hour
Distance (kilometers)

Vehicle Manufacturer Proprietary Gauges
Transmission Temperature (See Ultragauge MX)
Other Gauges (See Ultragauge MX)




* Actual available gauges are vehicle dependent.

mayor2013:
Run a scan. Though your pcm might not be stored with any fault error relating to this. Carry out an extensive engine tune up. Also check idle air control valve

Okay. This is noted. Thank you