Sorry folks, this is a bit of a long one.....
The problem
I'm trying to determine if there is anything I can do to lessen the hesitation that my car has when moving off from idling.
On pressing the accelerator from standstill there is a quite noticable momentary pause before the car actually moves.
I have previously been told that this can be because it takes longer for the air to get to the MAP sensor than it did to get to the MAF and also that it could be down to a presence in overlapping cells in one of the MAP2 tables.
When the MAP2 was installed I assumed there would be some drivability/performance trade off but TBH I was, and still am, quite appalled at the kangaroo effect the car displays.
In general driving when I stop, the idling speed will very often reduce to 500rpm or below for a fraction of a second. Once or twice the car has even stalled because of this.
What I have thought about
Is there a 'best place' for the MAP2 air temp sensor?
Where's yours?
Mine is dangling inside the airbox (not affixed to anything apart from it's wiring).
I'm guessing that an air temp sensor that is affixed to something would work better than one that is dangling and potentially waggling about... or would it make any difference considering it's in the small space of the standard airbox?
I've seen a member's car with the AIT sensor screwed into the battery side of the snorkel and his car does not hesitate anything like mine does. This is the only reason why I am querying placement of the sensor.
I am going to have a look at the R2D2 BOV I have on there and play with the spring to ensure it is set up correctly, in order to eliminate this. However, I did not have any BOV-related problems before the MAP2 was installed.
I attempted to clean the idle control valve but, after removing all sorts of gubbins to get at it, found the thing to be screwed in rather than bolted and I didn't fancy dropping the screws in the engine bay somewhere. I know that this will get dirty over time but, again, I did not have any idling/hesitation problems before the MAP2 was installed. I was just going to do this to eliminate it from my enquiries.
Other things to consider
I have 530cc injectors. Could this have any bearing?
I have grade 7 iridium plugs.
From cold starts I feel that the car is terrible unless it is left to run for a minute or so. It stutters more than Gareth Gates in a job interview. I have previously just put this down to having a colder grade of plug.
There are no other noticable running problems, just the transition from idling to under load.
The enrichment settings on the MAP2 have been tweaked and tweaked and tweaked again (by three individuals who all know what they're doing) but to no avail.
The MAF has been 'removed' in a functional sense though it's gutted casing (which still forms part of the air intake) is still there attached to the airbox and snorkel.
There may be something pertinent within my signature that I haven't mentioned.
Any thoughts or comments would be welcomed because I need to do something to get this improved. Please don't just say "move the sensor and find out" or similar because I don't want to go drilling holes in stuff only to find no improvement.
Thanks everyone