Question about 2004 GMC Sierra
The voltmeter will go to high went the engine is stared. we have put new battery in it
Akternators for a 12 volt systum charge at 13.5 when running from 800rpm to max ??4000rpm and shouldent change as the alternator put out AC current and coverts to DC in the reg on alt but max of 13.5 is all you need at any time at all revs and the battery will not boil or over heat..
Make of truck dont make any differance and milage dosent either as its the alternator thats either faulty or regulator is.
Let me know how you get on Ron
Posted on Oct 26, 2009
This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
Assuming you put on the proper gas cap and one of high quality, I would inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary.
Posted on Mar 12, 2010
sounds either like your alternator is bad, if it still goes dead then i would go with the alternator, other wise a cell or two could be bad or shorted in the battery.
Posted on Jun 25, 2010
Testimonial: "I'll try a battery first although it's only 2 years old."
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