Intermittent MAF problems - running out of ideas.....
Been having problems with my 156 1.8TS (1998) for ages and can't seem to pin down the root cause.
It's an intermittent problem (the best kind) which may occur several times a day then disappear for days, or on one occasion two weeks!
When active Alfa Diag tells me I'm losing all signal from the MAF, disconnecting it makes no difference (suggesting it's correct) and the car constantly stalls, kangaroo's and generally runs terribly - and occasionally refuses budge at all! Only errors codes are MAF (causing "injector" light to come on) and Lambada (no light, likely caused by the lack of MAF).
When the problem is not "active" I've got no warning lights and the car run almost perfectly - with the exception of a very occasional misfire (maybe once every third trip) just to remind me that it's sick.
The car's recently been serviced (it was due and it was hoped would resolve this) and I've replaced:
- MAF (March - long before this all started)
- HT leads (heavily corroded)
- Bad coil (number one from memory)
- Thermostat (problem spotted thanks to this forum - cheers guys!)
I've also recently cleaned the MAF and it's connector - ran great for 4 days following this and I thought I might have cracked it ....
Once "the troubles" start you can often bully the car through it and 10 minutes later the injector light goes off and it's plain sailing, other times I just have to nurse it home - stalling at every set of lights. It's sometimes resistant to all attempts at a fix - then will randomly work perfectly next time I try the car. Maddening!
Any idea guys? I've pretty much reached the end of my very limited mechanical knowledge!