156, 2.0TS Idle Fault
I'm hopeing someone may be able to point me in the right direction with a rather annoying fault on my TS.
I have an erratic idle basically
You are driving along and the revs will 'blip' (a momentary loss of power, noticable). This doesn't happen very often though, but.....
You appraoch a red traffic light, put the clutch in and come to a stop, and take pot luck as to where the revs will be, 960, 1200, 1500, 2000. Then they'll fluctuate up and down. If you 'dab' the accelerator they normally drop back down to around 1000, but may only drop to around 1500, they then may drop again, or just carry on fluctuating.
Nothing is consistant, some days it'll idle reasonably well, some days it'll be a right git, and some it'll be somewhere in between.
What I've done:
Put it on FiatECUScan - Only fault codes have been that the fan sometimes doesn't come on (only spotted twice this year) And I've spotted that the Lambda sensor hasn't given a signal on two different occasions, but nothing consistant.
I went along the route that the MAF was faulty, so bought a new one and fitted it, no differance.
I've performed a ECU reset and cleaned the throttle body.
I've changed the spark plugs and air filter, and checked for leaks in the air pipe.
So what next:
I don't have a never ending supply of cash, so I'm trying to avoid just buying new parts 'willy-nilly' to see if it'll sort it.
I've done a lot of reading on here and seem to be leaning towards the Lamda sensor being faulty, maybe the heating ellement not working correctly. Would this caurse this sort of fault? Is it easy to replace, or a right pig to remove the old one (1999 2.0 TS), I assume it's only one sensor after the cat, is that right?
Or am I barking up the wrong tree altogether?
Any and all help is always appreciated, TIA
Last edited by DavesZed; 25-10-11 at 08:38.