eratic idle problem!

[dsh85]

right ive been lookin into this a while on my s1 converted 16v

on basic idle the car is eratic revving up and down, it sometime can have a mind of its own by setting at a higher tempo after being revved, once revved again however it returns to the usual 1k ish

ive tried the throttle body from a car with no problems, so all sensors on that with no joy

ive tried crankshaft sensor

just recieved a map sensor as i thought it would be this as it seems to make no difference if its plugged in or not, but this hasnt changed

what else could it be?

im breakign a p reg 1.1 106, could i use the ht leads to see if its my coilpack?

any ideas greatly appreciated

thanks

[raunchz]

right ive been lookin into this a while on my s1 converted 16v

on basic idle the car is eratic revving up and down, it sometime can have a mind of its own by setting at a higher tempo after being revved, once revved again however it returns to the usual 1k ish

ive tried the throttle body from a car with no problems, so all sensors on that with no joy

ive tried crankshaft sensor

just recieved a map sensor as i thought it would be this as it seems to make no difference if its plugged in or not, but this hasnt changed

what else could it be?

im breakign a p reg 1.1 106, could i use the ht leads to see if its my coilpack?

any ideas greatly appreciated

thanks

would hint at maybe a wiring problem re: map sensor ?

[c20xejay]

hmm ive just had same problem i changed throttle body and worked out fine.... i know this maybe a long shot but try flywheel sensor ive just been reading a thread about it else where and that was there problem..

are throttle position sensors easy to fit?

[dsh85]

raunchz i did think that but was also maybe thinknig if summit else is buggering it up maybe its not really gettin round to doin its job properly, i suppose it shouldnt be too hard to check it over it only runs to the ecu right!

flywheel sensor isnt that the same as the crankshaft sensor? (on the front join between gearbox and block)

dont think itll be too hard to fit all the parts were removed from my tb and cleaned up

[vtr-barn]

Have u looked at the throttle potentiometer? I had a similar problem and thats what it was.
Barns

[dsh85]

Where is this?

what other sensors can affect this?

[vtr-barn]

Sorry bud i had a dealer do mine cause i put it in to them when i couldnt locate the problem...£700 later tht was diagnosed so yeah not sure where it was.:wacko:

[dsh85]

they should wear a mask and a striped jumper! its stupid the prices they charge!

anyway turned out to be the wiring to the map sensor, one wire was split. it now runs like a dream!

[Killeybh]

i got the saame mate, someone said ecu to me