Quote:
Originally Posted by trader4
You can drive the car with the DISA valve in any position, operating,
disconnected, etc and it will make very little difference. All it does
is improve the mid-range torque, allegedly and I've never noticed
a difference with it disconnected. If the seal is shot and
it's leaking air, then it could produce a lean condition.
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Previously I would have agreed with the above statement, but recently had an issue with rough running, running lean and the engine management light on. I found a split pipe and therefore replaced, expecting the problem to be fixed, but the engine still run rough and the light was still on. Therefore checked the disa value and the flap was missing, checked in manifold and no flap, therefore brought new flap and fitted. No car running fine, no longer running lean and light gone off, and all because I installed the missing flap.