Question about 1994 Ford Escort

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Engine go off

My car engine go off at slowly position, I can not adjust air enterance through air flow tunnel.

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I am going on vacation so I hope this helps,
Surely since its a car-borated engine with numerous vacuum lines, one vacuum line could be leaking causing this condition.
Setting that aside for now you could have a skewed T.C.C. valve. Thats the transmission converter clutch valve. It locks up the transmission torque converter to aid in fuel mileage at speeds above around 40 mph. The unit is normally locked out of 1st gear. When it acts up it applies at the higher speeds but doesn't disengaged. This will cause the engine to stall. The feeling to the driver is quite distinctive. The normally is a shaking or vibration felt the moment before the engine stalls, it could feel like a shutter not unlike the sensation one feels when driving a stick shift and comes to a stop in gear without depressing the clutch petal. The hole thing is controlled by the engine computer. There is a connector on the transmission which is normally square with 4 receptacles, disconnect it and drive the car as you normally would. See if it stops stalling. If so you need to replace the solenoid. Its located in the transmission under the transmission pan. This a long shot but without inspecting all the vacuum lines and numerous other sup-systems its well worth looking at a could be a fast test. Just unplug it and drive it normally

Posted on Jun 23, 2008

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How do I adjust the throttle position sensor on my 93 cadillac seville sls 4.9l engine?


4.5 And 4.9L Engines
  1. Remove the air cleaner.
  2. Remove the TP sensor connector.
  3. Unscrew the 2 TP sensor attaching screws and retainers, and remove the TP sensor.

To install:
  1. With the throttle valve in the normal closed idle position, install the TP sensor on the throttle body assembly.
  2. Install 2 TP sensor attaching screws with retainers. Do not tighten the screw until the TP sensor is adjusted.
  3. Install the TP Sensor connector. Adjust the TP Sensor and perform the idle learn procedure.
  4. To Perform the TP sensor adjustment.
    1. Disable the generator by grounding the green harness connector plug adjacent to the generator.
    2. Start the engine, enter diagnostics, and select PCM override PS103 'ISC Actuator'
    3. Press the 'COOLER' button on the CCP to retract the ISC Actuator. This action will disengage the A/C compressor and command the EGR 'OFF'. The Climate control center display will change from '50 to 00'. The ISC Actuator will slowly retract (about 20 seconds) to a fully retracted position. Verify that the throttle lever is resting on the minimum idle speed screw. With the ISC Actuator plunger fully retracted, disconnect the ISC harness.
    4. Select the PCM data PD01, 'TP Sensor', while still in PCM override PS03. Note the throttle position (in degrees) displayed on PCM parameter PD01.
    5. (-0.5° TO + 0.5°)

      No TP sensor adjustment required. Reattach the ISC Actuator harness and disconnect the grounding wire at the generator.
    6. TP Sensor (-10.0° TO -0.6°) or TP Sensor (+ 0.6° TO + 90.0°) TP Sensor adjustment required.

  5. With the engine 'OFF' and the ignition 'ON', reenter diagnostics and select PCM override PS03 'ISC Actuator'. Press the 'COOLER' button to retract the ISC Actuator the minimum air setting.
    1. Loosen the TP sensor screws just enough to permit the sensor to be rotated. Open the throttle slightly and allow the throttle lever to snap shut against the minimum air screw. Adjust the TP sensor so the parameter display is 0°. Tighten the TP sensor mounting screws with the sensor in the adjusted position. Recheck the parameter to be sure the TP sensor parameter is (-0.5° to + 0.5).
    2. Install the air cleaner.

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1 Answer

What is a solution to fixing the mass air flow system, with code po121


DTC P0121: Throttle Position (TP) Sensor 1 Performance
Circuit/System Description
The engine control module (ECM) uses the following information to calculate an expected airflow rate:
?€¢
The throttle position (TP)


?€¢
The barometric pressure (BARO)


?€¢
The manifold absolute pressure (MAP)


?€¢
The intake air temperature (IAT)


?€¢
The engine RPM


P0121 The predicted air flow and the predicted MAP combined are outside a calibrated range for more than 3 seconds.
Circuit/System Testing

  1. Inspect for the following conditions:
  2. ?€¢
    Vacuum hoses for splits, kinks, and proper connections as shown on Vehicle Emission Control Information label


    ?€¢
    Inspect thoroughly for any type of leak or restriction


    ?€¢
    Air leaks at throttle body mounting area and intake manifold sealing surfaces


    ?€¢
    Throttle body for dirt, debris, and coking--Refer to Throttle Body Cleaning.

  3. Allow the engine to reach operating temperature. Observe the MAP Sensor Voltage parameter with a scan tool. Voltage should be more than 0.8 volt and less than 4 volts.
  4. ?‡'
    If more than 4 volts or less than 0.8 volt, refer to DTC P0106.

  5. Idle the engine. Observe the MAP Sensor kPa parameter with a scan tool. Increase the engine speed slowly and then back to idle. The MAP sensor kPa should change smoothly and gradually as engine speed is increased and returned to idle.
  6. ?‡'
    If the MAP sensor kPa does not change, refer to DTC P0106.

  7. Take a snapshot of the engine data list while performing the actions listed below. The mass air flow (MAF) sensor g/s should change smoothly and gradually as the engine speed is increased and is returned to idle.
  8. ?€¢
    Idle the engine.


    ?€¢
    Increase the engine speed slowly to 3,000 RPM, then back to idle.


    ?€¢
    Exit from the snapshot and review the data.


    ?€¢
    Observe the Mass Air Flow (MAF) Sensor parameter frame by frame with a scan tool. The MAF sensor g/s should change smoothly and gradually as the engine speed is increased and is returned to idle.


    ?‡'
    If the MAF sensor g/s does not change smoothly and gradually as the engine speed is increased and is returned to idle, refer to DTC P0101 or P1101.

  9. Inspect the throttle body for the following conditions:
?€¢
Loose or damaged throttle blade


?€¢
Broken throttle shaft


?€¢
Any throttle body damage


?‡'
If any of these conditions exist, replace the throttle body assembly.

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1 Answer

Opel kaddet 1995 model. How do I adjust the


There are only two adjustments on a carburetor, the air mixture setting and the butterfly valve position setting. The air mixture screw is on the side close to the mounting flange, and has a spring behind the screw head to keep it in position.
To adjust it, look for the throttle valve screw which is also on the side, it ix the one that attaches close to where the throttle cable attaches to the carb. Turn the set screw down to let the car idle as slowly as possible. Now go to the air mixture screw. Turn it slowly first in one direction until the revs drop, then turn it out to the point where the revs are maximum. You might have to turn the screw back and forth until you find the best position. Now turn the throttle adjustment back to idle speed.

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Car stalls


I have a 1994 Volvo 850 that did the same thing. It was the fuel pump relay, a $50 part that is easy to replace yourself. It could also be the thermostat ($75) in the air flow box. Some people remove the bad thermostat and fix the air flow tube in the position with the air flow coming in from the front of the car. People say you can freeze your engine in winter if you live in a cold climate. It rarely gets cold where I live so it wasn't a problem for me. You do get better gas mileage without that thermostat. I ran my car without the thermostat for about a year and then put a new one in because I started having rough idling problems when the engine had not warmed up yet. The thermostat funnels in hot air from the manifold (?) until the engine warms up and then the spring in the thermostat closes off the tunnel with that hot air flow and opens up the tunnel with the cooler air flow coming in from the front of the car. If the thermostat quits working, the hot air keeps coming in and the engine shuts off after about 10 minutes of driving. The car will usually start right up after you wait a few minutes. These symptoms don't usually show any engine codes.

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4g93 gdi engine starts wont rev above 3000 rpm-starts misfiring cuts off as i mash the x sounds like starving for air scan tool once said fuel rail sensor swapped - air flow sensor, fuel pump & fuel...


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On Vehicle Inspection If a clanging noise due to the lash adjuster produced immediately after the engine has started or during operation persists, perform the following checks:
  1. Check the engine oil, and add or replace if necessary.
    1. If the engine oil is low, the air drawn in from the oil strainer will be trapped in the oil passage.
    2. If the engine oil level is higher than the specified level, agitation of oil by the crankshaft could cause a large amount of air to enter the oil.
    3. A deteriorated oil contains a large amount of air, because the air, once trapped, is not readily separated from the oil. If the air trapped due to these causes enters the high pressure chamber in the lash adjuster, the air in the high pressure chamber will be compressed while the valve is in the opened position. The lash adjuster will be drawn too far in, and will produce noise when the valve closes. This is the same phenomenon that occurs when the valve clearance is adjusted to an excessive dimension. Fig. 1: Check the valves with the white arrows, rotate the crankshaft 360°, then check the valves with the black arrows — 2.0L, 2.3L, 2.4L and 2.6L Engines 86663205.gif
      Fig. 2: Check the valves with the white arrows, rotate the crankshaft 360°, then check the valves with the black arrows — 3.0L (12 Valve) Engines 86663206.gif
      Fig. 3: Check the valves with the white arrows, rotate the crankshaft 360°, then check the valves with the black arrows — 3.0L (24 Valve) Engines 86663236.gif
      Fig. 4: Check the valves with the white arrows, rotate the crankshaft 360°, then check the valves with the black arrows — 3.5L Engines 86663207.gif
      Fig. 5: Push the rocker arm to check if the rocker moves down or not — all engines except for the 3.5L Engines. 86663208.gif
      Fig. 6: Push the rocker arm to check if the rocker moves down or not — 3.5L Engines. 86663210.gif
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  2. Start the engine and slowly race (accelerate the engine from idling speed to 3,000 rpm in 30 seconds and then decelerate it to the idling speed in 30 seconds) it several times (less than 10 times). If racing the engine causes the noise to die away, it means that the air has escaped from the high pressure chamber of the lash adjuster and that the lash adjuster has regained its normal functions.
    1. When the vehicle is parked on a slope for a long period of time, the oil in the lash adjuster will decrease. When the engine is started, the air might enter the high pressure chamber.
    2. After a long period of parking during which the oil in the oil passage goes away, it will take some time before the oil is re-supplied to the lash adjuster. Therefore, the air could enter the high pressure chamber.
  3. If any abnormal noise is not eliminated by racing, check the lash adjuster.
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    3. Press the rocker arm at the area indicated by the white arrow mark to check whether the rocker arm is lowered or not.
    4. Slowly turn the crankshaft 360°clockwise.
    5. In the same procedure as step "c'', check the rocker arm at the area indicated by the black arrow mark.
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Bleeding and Checking When cleaning or checking the lash adjusters, use only clean diesel fuel. To test the lash adjusters, follow this procedure.
  1. Immerse the lash adjuster in clean diesel fuel.
  2. While lightly pushing down the inner steel ball using a small wire, move the plunger up and down four or five times to bleed air. The use of the retainer facilitates the air bleeding of the rocker arm mounted type lash adjuster.
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