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About zaac

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  1. I have never watched the tach while crankkng but will sure start. As for crank sensor; does it make sense that disconnecting and reconnecting the battery would smarten it up? I have yet to see a crank sensor code. Problem is truck starts fine until -30 when I’m trying to get to work so not the best time for troubleshooting. And I leave before the sun comes up so would be even more fun. Was just hoping that someone had the same problem and new exactly where to direct me. Thanks for the replys.
  2. Hi people, I have a question for you please. 2000 Silverado 5.3L. At -30°C(-22°F) after being plugged in all night the truck will crank over good with 60 psi fuel pressure but has no spark. Disconnect the negative battery cable for 30 seconds then re-connect and it'll start right up after about 2 revolutions. I have replaced the PCM with another used one but same problem exists. Thanks for any suggestions.
  3. I always round off to the next dollar and it never caused a problem.
  4. Did you check out the pictures? The purpose of the evap system is to stop the gas from evaporating so in that sense I guess you could say it's closed. The vent is open but the charcaol canister absorbs the gas fumes while allowing the air through in order to allow re-fueling. Did you look up what that code is? Think it's a purge valve.
  5. Do you find it strange that the engineers designed it like this? I sure do. I guess it's not a critical thing but I would think it could have been easy for them to get it to run a test more often. Would have made your job easier.
  6. The test does not run every time the vehicle is run. Conditions must be right and even if they are right it may not run. • No active manifold absolute pressure (MAP) DTCs • No active intake air temperature (IAT) DTCs • No active throttle position (TP) DTCs • No active heated oxygen sensor (HO2S) DTCs • No active vehicle speed sensor (VSS) DTCs • No active system voltage DTCs • The ignition voltage is between 10 volts and 18 volts. • The barometric pressure is more than 75 kPa. • The fuel level is between 15 percent and 85 percent of full capacity. • The engine coolant temperature (ECT) is between 4°C (39°F) and 30°C (86°F). • The intake air temperature (IAT) is between 4°C (39°F) and 30°C (86°F). • The start up ECT and IAT are within 9°C (16°F) of each other. Thanks Mike. That answeres any questions I had about the evap. I'm sure I met all the variables over the last 2 days so i guess the pcm can go several days between tests. I had no idea.
  7. This morning I removed the fuel cap before starting and drove around all day. The engine light did not come on. wtf? The engine light does work and the computer has set one of the evap codes before(about every 2 months). This don't make sense to me. I thought it did a self test every cold start.
  8. Thanks for the info. I'm gonna have to read it a few more times but I'm hoping you'll answer just a few more questions. I didn't see any explanation on how the fuel cap works. On my 2000 Silverado there is a one way valve in the cap operated with a spring. It will let pressure in but not out. If there is a vent valve to let air in why does the cap also let air in? Is it just a back-up in case the vent valve gets stuck closed? When the key is turned on and it does its vacuum test why doesn't air enter through the cap and cause the test to fail? Is the spring in the one way valve strong enough to overcome the amount of vacuum in the tank during the test? When the engine is running what amount of vacuum/pressure is in the tank? I know these are anal questions but I've always wondered about it and since you have such a good understanding I figured I'd jump on the opportunity. Sure hope you read this. Thank...Jack
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