the car runs fine with it un-plugged (well not fine but it runs)

when i plug it in the engine stalls, whats the problem?

(1.6 zetec)

do you mean the MAF or the idle speed control valve bud?
they could both just need a clean
have a gander at loumiesters thread bout cleanin the MAF easy job
the idle speed control valve is also easy to clean just take it out and get some carb cleaner on it

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Fiesta Si 2.0
Fiesta 1.1
Peugeot 206 sw 1.4

check for any snapped wires leading to the maf sensor, happened to mine and it just starts but stalls about a second after.

its this little bugger thats the problem

I got one if you want it. £5 posted

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Is it in good working order. Mate?

Came off my si which worked fine. So I don't see why not.

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yhpm

installed the replacement tps earlier and the problem hasnt changed, however when the engine is running up to temperature, i plug the tps in, it doesnt stall, but the revs increase to 1750rpm, then slowly increases to about 2000rpm

then if you turn it off again and try and start it with the tps plugged in, it wont start unless my foot is flat on the gas

ive cleaned the MAF
ive cleaned the idle control valve

any ideas peeps?

ISCV might need replacing rather than just cleaning.

Unfortunately it's one of those problems where it could be a number of things. Have you looked for any vacuum leaks? I had a similar problem which turned out to be a little L shaped vacuum pipe under the coil Had a hole in it.

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Quote Clarkson, Top Gear, 17th July: "I'm not having a stroke... just driving a Nissan!"
Quote Ry, Mallory Park, 3rd Dec: "Ahhhh crap... Just a bit too over eager really!"
"I used to be an adventurer like you, but then I took an arrow in the knee"

i havent checked for vacume leaks yet no, thats my next port of call,

it just seems strange that it only plays up when the tps is involved

have you tried disconnecting the battery and leaving it for a while to re set itself and see how it does then?

imo after youve checked for any vac leaks i'd take it somewhere to get a diagnositc machine on it, that should help narrow down the fault

nahh ill try doing the battery tomorrow, and see if that'll work

is there a diagnostic plug on the si? i havent found it yet if so

yeah there is, iirc its in the engine bay near the battery up against the inner wing, it'll be a triangle shaped things with a red caps in them

ohh those things are the read plugs!! was wondering what they were

yeah

sadly the si doesnt have a fancy OBD port to diagnostics

Wow, Terry, I'm impressed. You used to know nothing!

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Quote Clarkson, Top Gear, 17th July: "I'm not having a stroke... just driving a Nissan!"
Quote Ry, Mallory Park, 3rd Dec: "Ahhhh crap... Just a bit too over eager really!"
"I used to be an adventurer like you, but then I took an arrow in the knee"