Question about 2001 Toyota Corolla

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Fuel system closed during acceleration, open during deceleration is this okay?

My corolla will rattle upon deceleration and when hooked-up to the engine code reader while running, the fuel system 1 goes back and forth between closed and open. I also have a lot of other data points like IAT 97 degrees (which) has a down arrow by it, but when it is 82 degrees it has an up arrow by it(Actron model autoscanner), Long Term Fuel Trim 1 has a down arrow by the 18% given, the catalyst Mon and Evap system Mon are flashing in the code reader, as well. So much stuff and don't know where to start. I have cleaned the MAF and added fuel treatment to clean injectors, etc. Any suggestions are appreciated. The codes previously thrown are multiple misfires in the 4th cylinder (P0300 and P0304) and Catalyst system below threshold (P0420)

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Posted on Jan 02, 2017

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SOURCE: 99 4runner misfire

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

Posted on Dec 31, 2008

  • 6 Answers

SOURCE: Check Engine Light Toyota Corolla

What is the mileage on that car? If the MAF sensor would be acting up, you get tip in acceleration hesitation, it sounds like the Air bypass valve is having issues. Replace it. Do not clean it just replace it.

Posted on Aug 29, 2011

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How do i complete the drive cycle in a 2004 Lincoln LS


A complete driving cycle should perform diagnostics on all systems. A complete driving cycle can be done in under fifteen minutes.
To perform an OBDII Driving cycle do the following:
  1. Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 50°C (122°F) and within 6°C (11°F) of the ambient air temperature at startup. Do not leave the key on prior to the cold start or the heated oxygen sensor diagnostic may not run.
  2. Idle. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire and if closed loop is achieved, Fuel Trim.
  3. Accelerate. Turn off the air conditioner and all the other loads and apply half throttle until 88km/hr (55mph) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.
  4. Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for 3 minutes. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.
  5. Decelerate. Let off the accelerator pedal. Do not shift, touch the brake or clutch. It is important to let the vehicle coast along gradually slowing down to 32km/hr (20 mph). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.
  6. Accelerate. Accelerate at 3/4 throttle until 88-96 km/hr (55-60mph). This will perform the same diagnostics as in step 3.
  7. Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for five minutes. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. If the catalyst is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst.
  8. Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.

Jan 12, 2016 | 2004 Lincoln LS V8

1 Answer

Distributor


Engine missing is a vast subject and calls for number of things to examine. What are the problem symptoms? Is it concerned with one or more of the following?
- Rough idle, stalls or misses.
- Engine hesitates/ poor acceleration.
- Engine diesels (runs after ignition switch is turned off).
- Muffler explosion (after fire) on deceleration only.
- Engine backfires.
- Engine rattles at idle speed only.
- Engine rattles at all speeds.
Please mention if there is some other symptom.
Thanks.


Feb 04, 2014 | 1994 Toyota Corolla

1 Answer

Okay so sometimes while I am accelerating, the gas pedal will suddenly stop responding and the car will begin to decelerate. After a few seconds I can begin accelerating again. I don't lose any power...


This could be a carburetor problem.
Open the bonnet and remove the air filter to get better access to the carburetor, check the throttle cables, is anything loosely connected or looks out of place?
move the throttle manually with your hand to get the feel of it, is it loose - tight - sticky or smooth?
check to see if the carburetor is tightly mounted, they do come loose from the housing and this let's additional air in possibly causing some of your symptoms.
This would also explain the idle issue.
check the choke cable too, check for kinks in all the cables or any obvious wearing.
change your fuel filter
check what fuel you should be running, octane ?
do you have a hand book for the car check that too
so just go through each thing, a process of elimination.
Once you have checked all the fuel system move onto your ignition system. Good luck

Sep 27, 2013 | 1996 Toyota Corolla

1 Answer

I have a 2001 mazda 626 and when im driving it skips sometimes


Description
Engine stops unexpectedly at beginning of acceleration or during acceleration
Engine stops unexpectedly while cruising
Engine speed fluctuates during acceleration or while cruising
Engine misses during acceleration or cruising
Vehicle bucks or jerks during acceleration, while cruising, or upon deceleration
Momentary pause at the beginning of acceleration or during acceleration
Momentary minor irregularity in engine output


Possible Causes
Air leakage from intake-air system parts
Improper operation of idle air control valve
Crankshaft sensor circuit malfunction
Camshaft sensor circuit malfunction
Spark leakage from ignition coil
PCV valve malfunction
Restriction in exhaust system
Open or short circuit in fuel pump and related harness
Improper fuel pressure
Fuel leakage from injector
Improper A/C system operation
Purge solenoid valve malfunction
EGR valve malfunction
EGR solenoid malfunction
Low engine compression
Vacuum leakage
Fuel pump control relay and resistor
Poor fuel quality
Air filter restriction
Electrical connector disconnection
No battery power supply to ECU or poor ground
Fuel pump mechanical malfunction
Clogged injector


Diagnostic Procedure

1. Verify vacuum hose connections, check the air filter, check for leakage or restriction of the intake-air system, ensure proper sealing of intake manifold and components attached (e.g. EGR, IAC), examine ignition components, fuel quality, and electrical connections. Are all items okay?

Yes - Go to next step
No - Service as required.
2. Check for stored OBD-II error codes. Are there any stored codes?

Yes - Go to appropriate DTC test
No - Go to next step
3. Is engine overheating?

Yes - Go to Symptom #10 for "engine overheats"
No - Go to next step
4. Connect an OBD-II scan tool capable of logging sensor output and drive the vehicle. Are engine speed (RPM), mass-airflow (MAF), throttle position (TP), and vehicle speed (VSS) PIDs within specifications?

Yes - Go to next step
No - Inspect crankshaft position sensor (RPM) circuit, mass airflow sensor (MAF) circuit, throttle position sensor (TP) circuit, and vehicle speed sensor (VSS) circuit.
5. Visually inspect the crankshaft position sensor and the teeth on the crankshaft pulley. Are these components okay?

Yes - Go to next step
No - Service as required
6. Measure the gap between the crankshaft position sensor and the teeth of the crankshaft pulley (specification: 0.5-1.5mm). Is the gap within specification?

Yes - Go to next step
No - Adjust crankshaft position sensor
7. Check spark plug condition. Are spark plugs wet, grayish white, or covered with carbon soot?

Yes - If wet or sooty, check for leaky fuel injector
No - Install spark plugs on original cylinders then go to next step
8. Remove PCV valve and shake PCV valve. Does the valve rattle?

Yes - Go to next step
No - Replace PCV valve
9. Verify that the throttle lever is resting on the throttle valve stop screw and/or throttle valve orifice plug. Are there any faults present?

Yes - adjust as necessary
No - Go to next step
10. Is there an exhaust restriction?

Yes - Inspect exhaust system
No - Go to next step
11. Check fuel pressure between fuel filter and fuel rail. Connect a jumper wire between the F/P terminal at the engine bay DLC connector and ground. Is the fuel line pressure within specification (280-330kPa or 41-48psi) with the ignition switch on?

Yes - Go to next step
No - If there is no or low pressure, check the fuel pump circuit, control relay and resistor, fuel pump relief valve as well as for fuel leakage inside the fuel pressure regulator and for a restricted main fuel line. If the fuel pressure is too high, check the fuel pressure regulator, the fuel pump control relay and resistor, and for a clogged fuel return line
12. Does fuel pressure increase when the accelerator is depressed?

Yes - Go to next step
No - Examine the fuel pressure regulator control (PRC) solenoid
13. Skip to the next step if the symptom occurs with or without the A/C running. If symptom occurs only with A/C operation, connect a pressure gauge to the A/C line and measure both low and high side pressures. Are the pressures within specifications?

Yes - Go to next step
No - Check the refrigerant charging amount, A/C pressure switch operation, condenser fan operation, and the A/C relay
14. Skip to the next step if the symptom occurs with or without cruise control operation. If symptom occurs only during cruise control operation, inspect the cruise control system. Is cruise control system operating properly?

Yes - Go to next step
No - Repair cruise control system
15. Is the evaporative emissions purge control system okay?

Yes - Go to next step
No - Check if purge control solenoid sticks open mechanically. Inspect the evaporative emissions control system.
16. Visually inspect the camshaft pulley, is the camshaft pulley okay?

Yes - Go to next step
No - Replace camshaft pulley
17. With the engine idling, disconnect the vacuum hose from the EGR valve and plug it. Is the engine condition improved?

Yes - Check for a stuck EGR solenoid vacuum valve, vent valve, and solenoid valve connector terminals
No - Check if the EGR valve moves smoothly. If yes, go to next step. If no, replace the EGR valve
18. Is the air-bypass valve actuator okay?

Yes - Go to next step
No - Replace air-bypass valve actuator
19. Check engine compression with a cylinder compression test tool. Is the engine compression within specifications?

Yes - Verify valve timing and transmission operation
No - Check for cause
20. Verify test results

Apr 25, 2012 | 2001 Mazda 626

1 Answer

What is the drive cycle for a 1999 vw jetta


The drive cycle is as follows
For all OBD2 VW's

OBD-II Drive Cycle Stages
The OBD-II Drive Cycle is an eight-stage course, as illustrated in the
chart on page 3. An explanation of each step is provided below.
Stage 1: Cold Start-The ECM determines the presence of a cold start
by comparing the engine coolant temperature to the ambient air
temperature during startup. The engine is considered cold when:
• Engine coolant temperature is below 122°F (50°C).
• Engine coolant and intake air temperatures are within 11°F (6°C) of
each other at startup.
During this period, the O2S heater, misfire, AIR, fuel system, and EVAP
monitors run.

Stage 2: Idle 2½ Minutes-Turn the air conditioning (A/C) and
headlights on to help the misfire monitor-the additional electrical loads
help even out combustion pulses. During this period, the O2S heater,
AIR, EVAP, misfire, and possibly fuel system (if operating in closed loop)
monitors run.

Stage 3: Accelerate-Prior to accelerating, turn off the A/C and
headlights (if possible). Open the throttle halfway until you reach
55 MPH (89 KPH). During acceleration, the misfire, fuel system, and
EVAP monitors run.

Stage 4: Steady State Cruise-During this portion of the cycle, the
O2S, AIR, EGR, EVAP, misfire, and fuel system monitors run.

Stage 5: Decelerate-Gradually coast down without applying the
brakes. Also, on manual transmission vehicles, remain in high gear and
do not press the clutch. During this period, the EGR, EVAP, and fuel
system monitors run.

Stage 6: Accelerate-Apply ¾ throttle until reaching 60 MPH (97 KPH).
During acceleration, the misfire, fuel system, and EVAP monitors run.

Stage 7: Steady State Cruise-During this period, the CAT, O2S, AIR,
EGR, EVAP, misfire, and fuel system monitors run.

Stage 8: Decelerate-Gradually coast down without applying the
brakes. Also, on manual transmission vehicles, remain in high gear and
do not press the clutch. During this portion of the Drive Cycle, the EGR,
EVAP, and fuel system monitors run.

You can try this a couple times, but if it doesn't work you should go to a VW specialty shop like the dealer or a shop that does mostly European cars and they can use the scan tool to force the car through readiness.


Oct 11, 2010 | 1999 Volkswagen New Jetta

1 Answer

Obd2 system rediness status won't clear so I can run the smog test due to replacing the battery.


takes a long time to run the rediness test since there are 6 different tests to complete...

PROCEDURE 1
EVAPORATIVE EMISSION SYSTEM LEAK MONITOR
Inspection Conditions
Engine coolant temperature: 30°C (75°F) or less (The engine is stopped before the test drive is started).
Atmospheric temperature: 5 - 30°C (41 - 113°F).
Condition of A/T: Selector lever D range.
Fuel remained in fuel tank: 30 - 50% is recommended.
Time required: 16 minutes or less after started the engine.
Drive cycle pattern: One trip monitor (from start to ignition switch to "LOCK" (OFF) position. Well be completed while traveling with the following drive cycle pattern.
Test Procedure
Engine: start.
Accelerate until the vehicle speed is 89 km/h (55 mph) or more.
While keeping the accelerator pedal opening degree constant, keep the vehicle speed at 89 km/h (55 mph) or more and travel for 16 minutes.
Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.

PROCEDURE 2
FUEL TRIM MONITOR
Drive Cycle Pattern
Inspection Conditions
Engine coolant temperature: 100°C (212°F) or less.
Atmospheric temperature: -10 - 60°C (14 - 140°F).
Condition of A/T: Selector lever D range.
Time required: 30 minutes or more.
Drive cycle pattern: One trip monitor (from start to ignition switch to "LOCK" (OFF) position). Will be completed while traveling with the following drive cycle pattern.
Test Procedure
Engine: start.
Accelerate until the vehicle speed is 89 km/h (55 mph) or more.
While keeping the accelerator pedal opening degree constant, keep the vehicle speed at 89 km/h (55 mph) or more and travel for 30 minutes.
Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position

PROCEDURE 3
CATALYTIC CONVERTER MONITOR
Drive Cycle Pattern
Inspection Conditions
Atmospheric temperature: -10°C (14°F) or more.
Condition of A/T: Selector lever D range.
Engine coolant temperature: Not set.
Time required: 16 minutes or more.
Drive cycle pattern: One trip monitor (from start to ignition switch to "LOCK" (OFF) position). Will be completed while traveling with the following drive cycle pattern.
Test Procedure
Engine: start.
Accelerate until the vehicle speed is 89 km/h (55 mph) or more.
Travel for 300 seconds or more while keeping the vehicle speed at 89 km/h (55 mph) or more.
Decelerate until the vehicle speed is within 80 km/h (50 mph) or less.
While traveling at 56 - 80 km/h (35 - 50 mph) for 10 minutes or more, fully close the throttle at least once in 2 minutes and decelerate for 10 seconds or more.
Do not repeat deceleration too often.
Vehicle speed may go below 56 km/h (35 mph) after the deceleration.
Stopping and braking are permitted. (If stopped or drive at 56 km/h (35 mph) or less for more than 5 minutes the monitoring may be stopped. In this case please restart monitoring from the beginning.)
After completing the above deceleration, bring the vehicle speed back to 56 - 80 km/h (35 - 50 mph) and keep it in the range until starting the deceleration again.
Repeat the above deceleration at least 5 times.
Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position

PROCEDURE 4
HEATED OXYGEN SENSOR MONITOR
Drive Cycle Pattern
Inspection Conditions
Engine coolant temperature: 100°C (212°F) or more.
Atmospheric temperature: -10°C - 60°C (14 - 140°F) or more.
Condition of A/T: Selector lever D range.
Time required: 16 minutes or more.
Drive cycle pattern: One trip monitor (from start to ignition switch to "LOCK" (OFF) position). Will be completed while traveling with the following drive cycle pattern.
Test Procedure
Engine: start.
Accelerate until the vehicle speed is 56 - 80 km/h (35 - 50 mph).
While keeping the accelerator pedal opening degree constant, keep the vehicle speed at 56 - 80 km/h (35 - 50 mph) and travel for 16 minutes or more.
Stopping and braking during this operation are permitted. Keep the accelerator opening degree constant for 1 minute or more after each acceleration.
Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position

PROCEDURE 5
EXHAUST GAS RECIRCULATION (EGR) SYSTEM MONITOR
Drive Cycle Pattern
Inspection Conditions
Engine coolant temperature: 100°C (212°F) or less.
Atmospheric temperature: 5 - 60°C (41 - 140°F).
A/C switch: OFF.
Condition of A/T: Selector lever D range.
Time required: 16 minutes or more.
Drive cycle pattern: One trip monitor (from start to ignition switch to "LOCK" (OFF) position). Will be completed while traveling with the following drive cycle pattern.
Test Procedure
Engine: start.
Accelerate until the vehicle speed is 56 - 80 km/h (35 - 50 mph).
While traveling 16 minutes or more at 56 - 80 km/h (35 - 50 mph) with engine speed 2,000 r/min or above, fully close the throttle at decelerate for 5 seconds or more until the engine speed reaches 1,000 r/min or under.
Do not repeat deceleration too often.
Stopping and braking are permitted (Rapid deceleration and sharp steering are not permitted).
After completing the deceleration, bring the vehicle speed back to 56 - 80 km/h (35 - 50 mph) and keep it in the range until starting the deceleration again.
Repeat the above deceleration at least 8 times by fully closing the throttle valve.
Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position

PROCEDURE 6
OTHER MONITOR (Main Components, Sensors & Switches, Wire Breakage & Short Circuit)
Drive Cycle Pattern
Inspection Conditions
Engine coolant temperature:
100°C (212°F) or less (Except engine coolant temperature sensor monitoring).
30°C (86°F) or less (Engine coolant temperature sensor monitoring).
Atmospheric temperature:
5°C (41°F) or more (Except engine coolant temperature sensor monitoring).
-10°C (14°F) or less (Engine coolant temperature sensor monitoring).
Condition of A/T: Selector lever D range.
Time required: 21 minutes or more.
Drive cycle pattern: One trip monitor (from start to ignition switch to "LOCK" (OFF) position). Will be completed while traveling with the following drive cycle pattern.
Test Procedure
Engine: start
Accelerate until the vehicle speed is 56 km/h (35 mph) or more.
While keeping the accelerator pedal opening degree constant, keep the vehicle speed at 56 km/h (35 mph) or more and travel for 16 minutes or more.
Return the vehicle to the shop.
After stopping the vehicle, continue idling for 5 minutes, and then turn the ignition switch to the "LOCK" (OFF) position. Moreover, the vehicle should be set to the following conditions for idling.
A/C switch: OFF
Lights and all accessories: OFF
Transmission: Neutral

Sep 15, 2010 | 1998 Mitsubishi Eclipse

1 Answer

What has to be done to complete drive cycle.


To perform an OBDII Driving cycle do the following:
  1. Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 50°C (122°F) and within 6°C (11°F) of the ambient air temperature at startup. Do not leave the key on prior to the cold start or the heated oxygen sensor diagnostic may not run.
  2. Idle. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire and if closed loop is achieved, Fuel Trim.
  3. Accelerate. Turn off the air conditioner and all the other loads and apply half throttle until 88km/hr (55mph) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.
  4. Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for 3 minutes. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.
  5. Decelerate. Let off the accelerator pedal. Do not shift, touch the brake or clutch. It is important to let the vehicle coast along gradually slowing down to 32km/hr (20 mph). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.
  6. Accelerate. Accelerate at 3/4 throttle until 88-96 km/hr (55-60mph). This will perform the same diagnostics as in step 3.
  7. Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for five minutes. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. If the catalyst is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst.
  8. Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.

Aug 12, 2009 | 2000 Saturn SL

1 Answer

Loud engine noise at certain speeds


could very well be a timing issue if it sounds like a rattling or a very poor grade ofuel. If you are using regular fuel, try putting some premium in next fuel up. It should be repaired mconyuinued driving can cause damge.

May 07, 2009 | 2005 Toyota Corolla

1 Answer

Pcm not ready, NYS inspection, 1997 Saturn SL-1


Performing a GM OBDII Driving cycle:

  1. Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 122°F (50°C) and within 11°F (6°C) of the ambient air temperature at startup.
    Do not leave the key in prior to the cold start or the heated oxygen sensor diagnostic may not run.
  2. Idle. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire, and - if closed loop is achieved- Fuel Trim.
  3. Accelerate. Turn off the air conditioner and all the other loads and apply half throttle until 55mph (88km/hr) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.
  4. Hold Steady Speed. Hold a steady speed of 55mph (88km/hr) for 3 minutes. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.
  5. Decelerate. Let off the accelerator pedal. Do not shift, touch the brake or clutch. It is important to let the vehicle coast along gradually slowing down to 20 mph (32km/hr). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.
  6. Accelerate. Accelerate at 3/4 throttle until 55-60mph (88-96 km/hr). This will perform the same diagnostics as in step 3.
  7. Hold Steady Speed. Hold a steady speed of 55mph (88km/hr) for five minutes. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. If the catalyst is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst.
  8. Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.

Mar 21, 2009 | Saturn SL1 Cars & Trucks

1 Answer

Metallic rattle during acceleration


Try moving up 1 grade of fuel, if you are using 87, put in 89. See if this helps.

Jul 18, 2008 | 1999 Toyota Corolla

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