Question about 1994 Hyundai Excel
When i start my car the car idles very poorly and when i add gas it sounds liek its chocking and has no power to drive? is this a air sensor problem or fuel filter?
Robie: from your description, you may have what is called a "FALSE AIR" problem. This is where air unmetered air is getting into the engine.
You have an airflow meter which is up at the area where your air filter is located. Inbetween the airflow meter and the throttle body (the part where, when you step on the gas pedal, the linkage moves a butterfly type valve open, allows air in the engine), is a large black hose. If this hose has any splits or tears in it anywhere along the way, it will allow unmetered air(air which isn't passing through the air flow meter)create a lean condition which will cause an idling problem as well as a hesitation and lack of power in general. You can also have smaller hoses along the way, which may be attached to the larger hose that are torn, split or missing. Any type of a vacuum leak can cause the symptom.
The fuel filter is not likely to be the problem.A fuel filter will usually cause the car to loose power the harder you push it but may not demonstrate a problem at idle and low speeds.
If this is not a solution, I will be more than willing to work with you to solve your problem.
Posted on May 10, 2009
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Posted on Jan 02, 2017
Tips for a great answer:
Throttle body tampering, excessive deposits, or damage. Refer to Fuel System Description .
Restricted air intake system
Large vacuum leak
Inspect the air intake ducts for being collapsed, damaged areas, looseness, improper installation, or leaking especially between the mass air flow (MAF) sensor and the throttle body.
Inspect crankcase ventilation valve for proper operation.
Inspect the throttle position (TP) sensor and related wiring. Refer to DTC P0123 .
Monitor the 24X crank sensor and the CMP sensor present parameters on the scan tool. If both are not responding, test the sensor feed circuit. Both sensors use a separate feed circuit but are internally connected to power. Test all CKP sensor A and CMP sensor circuits for intermittents. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Monitor the 3X parameter on the scan tool. If the 3X is not responding, inspect the CKP sensor B and circuits for intermittents. Inspect the ignition control (IC) circuit, IC timing control circuit, low resolution engine speed signal circuit and the low reference circuit for intermittents. If these circuits become open, or shorted may not set a DTC immediately, but are capable of causing driveability complaints. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Test the exhaust gas recirculation (EGR) system for proper operation. Refer to Exhaust Gas Recirculation (EGR) System Description .
Inspect the transaxle range switch input with the vehicle in drive and the gear selector in drive or overdrive.
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