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Pickups Chevrolet Silverado & GMC Sierra Chevy Silverado and GMC Sierra Electrical and Computer Questions
358 messages, Last post on Dec 02, 2009 at 4:47 AM
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Replying to: jeh4 (Jan 02, 2008 1:58 pm) |
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My 2001 Chevy 2500 HD 6.0 liter is misfiring on #'s 2,4,6,8 cylinders and if I understood it correctly it is all on the passenger side. It just happened over night. It came up on the computer as being one of three things. Intake gasket, bad plugs or wires. Had the gasket replaced and drove it home about 7 miles and it ran fine. Sat for two days started it up and it was misfiring again with the service engine light flashing as before. I do have a bad catalytic converter that has been rattling for about 4 months, I don't know if that has any bearing on the problem or not. Thanks for any help.
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Replying to: 98redrider (Sep 21, 2009 4:23 am) |
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2007 Siverado 1500HD battery dies when truck is not used for more than 3-4 days, I have had the dealer do many tests and no real answers, the battery has been changed out twice, the truck is optioned up pretty good, so there are a lot of draw functions on it, but the parasitic draws are not out of line according to the dealer, I would like to use a bigger better battery, but the space won't allow this....any one had this problem???, the truck is well maintained, and had about 21K on it
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Replying to: levin1 (Sep 21, 2009 7:51 am)
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Replying to: greywrench (Sep 22, 2009 7:25 pm) |
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Replying to: carnut69 (Sep 22, 2009 9:39 am) |
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Service Engine Light with Code 440 emission fault, can not seem to find the problem. Have checked the wires and plugs, gas cap,etc. The canister is ok, but not sure how to check the purge solenoid? Anyone who has had this problem or idea I can use! With the code cleared you can start and drive maybe three times before the service engine light comes back on.
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Replying to: denham (Oct 16, 2009 10:39 am)
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Replying to: denham (Oct 16, 2009 10:39 am) DESCRIPTION The EVAP LARGE LEAK TEST is based on applying vacuum to the EVAP system and monitoring the rate of vacuum decay. The Powertrain Control Module (PCM) uses the input from the Fuel Tank Pressure (FTP) sensor in order to determine the rate of vacuum decay. At an appropriate time, the PCM turns the EVAP canister purge valve ON (open) and the EVAP canister vent valve ON (closed). This allows the engine to draw a vacuum on the system. At a calibrated time or vacuum level, the PCM turns the purge valve OFF (closed), and tests the system vacuum. If the system is unable to achieve the calibrated vacuum level, the PCM will set DTC P0440. CONDITIONS FOR RUNNING THE DTC •DTCs P0107. P0108, P0110, P0112, P0113, P0115, P0117, P0118, P0121, P0122, P0123, P0125, P0443, P0449, P0452, P0453, P1106, P1107, P1111, P1112, P1114, P1115, P1121 or P1122 are not set. •The system voltage is between 10-18 volts . •The startup (ECT) engine coolant temperature is between than 4-30°C (39-86°F) , but the start up ECT is not more than 8°C (14°F) more than the startup IAT temperature. •The startup (IAT) intake air temperature is between than 4-30°C (39-86°F) , but the start up IAT is not more than 3°C (7°F) more than the startup ECT temperature. •The fuel tank level is between 15-85 percent . •The Barometric Pressure (BARO) is more than 75 kPa . •The Vehicle Speed Sensor (VSS) is less than 75 mph . CONDITIONS FOR SETTING THE DTC The EVAP system is not able to achieve or maintain vacuum during the diagnostic test. ACTION TAKEN WHEN THE DTC SETS •The control module illuminates the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails. •The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records. CONDITIONS FOR CLEARING THE MIL/DTC •The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. •A current DTC, Last Test Failed, clears when the diagnostic runs and passes. •A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. •Use a scan tool in order to clear the MIL and the DTC. DIAGNOSTIC AIDS •Use the EVAP pressure/purge diagnostic station in order to pressurize the EVAP system to aid in locating intermittent leaks. •Move all EVAP components while testing with the Ultrasonic Leak Detector. •A temporary blockage in the EVAP canister purge valve, purge pipe or EVAP canister could cause an intermittent condition. To repair a blockage in the EVAP system refer to Evaporative Emission (EVAP) System Cleaning. See: Emission Control Systems\Evaporative Emissions System\Service and Repair |
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