clutch in the bin
Join Date: Mar 2009
Location: United Kingdom
County: North Yorkshire
2000-3000 revs - no mans land.
I've recently noticed that when cruising, a slight adjustment to speed by easing off the accelerator gives can give me a sharp drop in throttle as if I had completely removed my foot suddenly from the accelerator.
Trying to replicate that on the driveway, I have found that I can ease the car up to 2000 revs, but then it seems to hold there a little even with more gas applied, but then suddenly shoots up to 3000 revs. The same can be said about deceleration, it holds at 3000 revs and suddenly drops to about 2000 revs, cant hold anything in between.
Hooking it up to multiecuscan shows the lambda fluctuating between 60 and 850mv which I think is normal, but it does drop to 6 / 7 mv as it makes the sudden drop to 2000 revs which I think simply indicates a lean mixture for that moment. Form this I think the lambda is fine.
Disconnecting the MAF doesn't seem to make any difference although it is hard to tell as it runs poor disconnected anyway.
Any ideas? Are my assumptions about the lambda correct? Could the idle control valve have any impact (I repaired it last year following the hunting issue these give at idle).
1999 2.0 Twin Spark by the way