Question about 2005 Chevrolet Malibu

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05 chevy malibu, had trouble starting finally turned over, running very rough and can't pick up speed, can't go over 10 mph.

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  • dhrt2006 Mar 06, 2009

    Thank You, these suggestions are very helpful!

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Hello!
Most probably one cylinder was not running, due to ptoblem with distributor cap/wiring/plugs. Another reason might be fuel supply problems (fuel injector or fuel filter clogged). Is check engine on
If yes scan the car for free at Autozone store. It might be bad O2 sensor or coolant temperature sensor too
Hope that helps
Good Luck

Posted on Mar 05, 2009

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Check the egr valve. if u use cheap gas i would say cadalac comvertor

Posted on Mar 05, 2009

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If the check engine light is on you need to have the computer checked for trouble codes to help narrow down the options.

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Here is the drive cycle procedure for that vehicle, and let me know if you require any further assistance.


Running an OBD-II Drive Cycle

The purpose of the OBD-II drive cycle is to run all of the onboard diagnostics. The drive cycle should be perfomed when any trouble codes are erased from the PCM or if the battery was dis-connected. Performing the drive cycle will reset the monitors so that any further trouble codes can be detected.

The OBD-II system drive cycle begins with a cold start with the coolant temperature below 120 degrees F. and the coolant and the air temperature sensors within 10 degrees of each other. (The ignition key must not be "on" or in the "Run" position until the cold start or the heated O2 sensor diagnostic might not start)

1. As soon as the vehicle starts up, idle the engine in drive for two and a half minutes with the AC and the rear defrost on if equipped with a rear window defroster. The OBD-II will check the O2 sensor circuits, the air pump, and the EVAP purge.

2. After the two and a half minutes turn off the AC and the rear window defrost, and then accelerate to 55 mph at half throttle. OBD-II checks for any ignition mis-fires, fuel trim, and canister purge.

3. Hold steady at 55 mph for three minutes. OBD-II monitors the EGR system, the air pump, the O2 sensors and the canister purge.

4. After the three minutes decelerate down to 20 mph without using the brakes or the clutch. OBD-II checks the EGR and the purge functions.

5. Accelerate back up to 55 mph at half throttle. OBD-II checks for mis-fires, fuel trim, and purge functions again.

6. Hold steady at 55 mph for five minutes. OBD-II will monitor catalytic converter efficiency, for any mis-fires, EGR function, fuel trim, O2 sensor operation, and purge functions.

7. Decelerate to a stiop without using the brakes or the clutch. OBD-II makes a final check of the EGR system and the canister purge functions.

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