EVAP Moniter on 1998 v6 3800 camaro "incomplete" - Team Camaro Tech
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Old Jun 15th, 13, 06:40 PM   #1 (permalink)
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EVAP Moniter on 1998 v6 3800 camaro "incomplete"

What is the procedure for making the "EVAP" moniter for OBD II "ready?"
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Old Jun 15th, 13, 08:54 PM   #2 (permalink)
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Question Re: EVAP Moniter on 1998 v6 3800 camaro "incomplete"

Did it throw a code and have to be reset?

The moniotring works by pulling a vacuum on the system (via a solenoid in the engine compartment plumbed into the fuel vent system) and seeing how long it takes to achieve a required vacuum reading.
It the edge clocking of the monitoring circuit times out prior to achieving the required vacuum over a couple of key off/on cycles it will then set a code.
Problems can be many ...
Bad line, bad vapor canister system, bad/loose fuel cap and a few more are most common.

If this has been a problem (MIL code displayed) for awhile there is a 'History' in the ECM that will need to be driven off over time/cycles before the history will be reset and not show during an emissions test.

Best bet if it is a marginal system is to always have a full or nearly full fuel tank before going in for any manditory testing
This gives the least amount of 'free space' for the system to have to pull-down to achieve the required vacuum

Hope some of this helps ...
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