Checks
| Action
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DEFINITION: Momentary lack of response as the accelerator
is pushed down. Can occur at any vehicle speed. Usually more pronounced
when first trying to make the vehicle move, as from a stop sign.
May cause the engine to stall if severe enough.
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Preliminary
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Sensor/System
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| • | Check the heated oxygen sensors (HO2S)s for proper operation.
The sensors should respond quickly to different throttle positions.
If not, check the sensors for silicon from RTV sealant, or other
contaminants from the fuel. The sensors may have a white powdery
coating. Silicon contamination causes a false high signal voltage
(rich exhaust indicated). The powertrain control module (PCM) will reduce
the amount of fuel delivered to the engine. |
| • | Check the manifold absolute pressure (MAP) sensor for proper operation. |
| • | Check the throttle body, throttle position (TP) sensor, and accelerator
cables for proper operation. |
| • | Check the exhaust gas recirculation (EGR) system for proper operation. |
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Fuel System
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| • | Check the fuel injectors. Refer to the following: |
| • | Check for items that cause the engine to run rich, or lean. |
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Ignition System
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| • | Check the ignition control (IC) circuits for proper connections
at each ignition module assembly. |
| • | Check for proper ignition voltage output using the J 26792
Spark Tester. |
| • | Check the ignition coils for cracks, or damage. |
| • | Check for a missing or damage ignition module assembly grounding
spring. |
| • | Check for misaligned or damaged spark plug boots. |
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Automatic Transaxle
| Check for proper operation of the transmission fluid pressure
(TFP) manual valve switch. Refer to
Harsh Garage Shift or Engine Hesitation on Acceleration
in Automatic Transaxle
4T80-E.
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Additional Checks
| Inspect the vacuum hoses for splits, kinks,
damage, improper connections, or routing.
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