Guys i just got in from a short drive in the S and was about to post exactly the same prob as Saxo has but he beat me to it

Exactly the same problem, Driving then all of a sudden when i stop at lights or junction, the revs drop all the way down and sometimes the car will stall.

Only happened 4 times so far over the past 10 days or so.

I havent tried the MAP whak but have cleaned the connector and taken the sensor off to see if it was gunked.

what you think, shall i do the same as in the thread or just buy a new Map sensor?

Cheers

Rob

 

Its a delicate little thing internally, and not like a MAF which has anything visible to clean. If you take it off all you will see is a little plastic pipe which leads into the internals of it.

I woulnt like to clean it personally.

MB

 

When i took it off i thought it may be gnked but wfter seeing what it was like i didnt touch it just screwed it back on.

If it was the MAP sensor wouldnt the engine management light come on?

 

Not always. In fact I havent heard of one throwing a CEL. Maybe a bit difficult for the ECU to know this one was buggered, give its function.

MB

 

If you 2 lived close I would say it sounds like dodgy fuel, but as a large gap, and neither of you are near the recent fuel depot fire I would like to think not.

Have you tried running some injector cleaner through the system ??

 

Right, well im off out to whack the shit out of the MAP.

Lump hammer should do the trick

 

there should be no actual tension in the throttle cable when there is no pressure on the throttle pedal. If you tension it, then you artificially increase the idle speed. Your accelerator cable may actually be too loose it its in danger of falling out and you might not be getting full throttle when you floor the pedal, but this shouldn't affect your idle speed.

 

I dont think you can tighten it that much as there isnt enough thread on the adjuster, but good point all the same.

MB

 

Ok in order I have done:

1. Topped up with oil back to full mark
2. Tightened the throttle cable to almost 'twaaang' tight but not interfering with closed throttle position
3. Whacked the map with the rubber handle of a hammer. Hit from various angles with enough force to dislodge loose material without totally thumping it
4. Checked all hoses and pipes
5. Reset ecu
6. Allowed two full fan cycles on idle to 'learn'
7. Check with hand around all hoses for any signs of air leak
8. Generally listened to and watched engine

The engine is rock solid, no movement, no funny sounds and no odd behavour. The idle holds nicely at just below 1000rpm which is what I think it should be and it doesn't stutter or judder - it seems perfectly happy.

Hopefully with less slack to work the throttle will now be easier to opperate on the road and I expect that if I was having problems getting WOT before I'll have all my ponies now All I need to do is run her and report if the problem persists in the next few days.

I'll let you all know either way so that this can be documented and used by others if need be

 

OMG, OMG, OMFG!!

Just been out for a 1 mile stint to the chippy (I know, I know = fat f*ck) and it was superfly-TNT fast!! Whether I can now get WOT where before I was just short or if the ecu-reset has temporary put the 'brain' back to infant mode where the world is a lovely place and there is no wrong I don't know but right now its got that 5-10% something special where it 'feels' like it wants to go. The sort of fast where you'd line up next to a noble and think, 'I might actually have a chance'

No sign of the problem but then the short drive I did would not be the sort to produce it so I'll read nothing into that yet.