<< >>

I mention that on the first page of these post..
The vave or any of the vac lines to it can cause lean condition.

To repeat.. I had a lean condition 104 that had a purge valve that was stuck in the open position.
These valves get gunk in them and stick..
A sign of a good one is to hold in in your hand and feel for a Heartbeat pulse...
It is on the left fenderwell and says 'MOT" on top.
Both the purge and egr can leak/stick and not show as vac leaks BC they are leaking within the system itself, as opposed to hissing / open to ambiant leaks..
I see you have AllData ... they have all these simple test procedures in there..

You will notice in the alldata info on purge that the ECU opens/closes the valve in little pulses.. [ that is the heartbeat feel I talk of]. The reason the ecu does this in little gulps is so that
the engine does not stall or run rough..it has time to absorb this
unmetered air in little shots, so you can see how a stuck open valve can upset A/F mix...
Usually, with both egr and purge, one will also get codes .. but not allways [ specially with intermittant sticking]
Some guys have success w/cleaning the valve with WD-40
[ archieves]