idle and temp needle problems please some advice needed!

[j555boy]

hi guys i have changed the idle control valve, AFM and cleaned the throttle but still i have a crazy idle sometimes going up to 3000 rpm and then dropping back down. it sometimes doesnt start after its hot aswell. the needle is rocking back and forth too!

do i need to change the blue temp sensor? or themostate?

i will appreciate any help jamie

[Brianmoooore]

Tighten the brass nuts on the back of the instrument cluster and tell us what engine you have will do for a start.

[j555boy]

hi have tightened the brass nut up but still no difference.

i have a bmw 325i e30 convertible 1989.

can anyone advise me what to do?

cheers jamie

[j555boy]

no advice i thought someone would have come up with something by now many thanks jamie

i am going mad with this idle problem

there are no air leaks, so thats why i think its the blue sensor?

what does the blue sensor do, it also seems like its over fueling. its using loads of petrol.

cheers guys

[Brianmoooore]

Over fueling and poor hot starting could well be due to a duff blue temp. sensor, if it's telling the ECU that the engine's cold all the time.