I think my maf is to blame for this just want to see if you guy's agree before I part with my cash.
On the way to work the other day I overtook a big merc and just as I got past it the car started to stutter and wouldn't rev freely. So feeling like a bit of a **** as I was now slowing down the person I just overtook I pulled over and parked up. Plugged in the fiat examiner (just happened to be in the boot) no errors. Un-plugged the maf and plugged it back in again. Started again and it ran fine the rest of the way although a bit down on power especialy at low revs.
Now its not to bad from a cold start but once the engines warmed up it stutters badly pulling away and really struggles to rev cleanly. When cruising its not to bad but a distinct lack of power.
Is it normal for a maf to fail so suddenly? Or has anyone got any other ideas?
Try unplugging the cable from the MAF and running it like that for a few minutes, getting the revs up above 4K as that seems to be the failure point. It will idle badly (if at all) and the engine management light will come on while it's unplugged. Should go out when you plug it back in.
Yes they do fail suddenly and not all faults show up under the diagnostics! Sometimes you only get a fault code if it is totally fried ... or unplugged!
Didn't drive it with the maf disconnected but it did idle less evenly with it disconnected. Think i"ll dive out of work early and take it for a drive with it off to see what happens. Before I go to the auto factors.
But check first what the part number of the actual MAF sender is ... lots of manufacturers use the same part in different intake pipes .. and the Alfa pipe is well known for being vastly over-priced compared to say a Vauxhall part of the same type!
There might be a thread on the forum with a list of the part numbers .. otherwise it's on the other one!
thats a good price for a new one. make sure you get the correct part number for your vehicle otherwise it wont run properly (although some on here are doing this with no faults whatsoever, the lucky ones lol)
Ok went back to the car engine off temp is -30 started from cold went straight to 54 let it warm up to 95 then it suddenly dropped back to 85 without the fan kicking in and started to creep back up again.
Checked for faults again and now we have-
Air Flow Meter - SC to ground oc intermittent (I assume that's because I drove home last night with the maf disconnected)
Air Temp Sensor- OC or SC to +Batt V Intermittent
Lambda Sensor- Intergrator above top limit intermittent
Cleared all the codes went for a lap of the multi storey car park and checked for faults again nothing there but running really rough. Should also mention last night it ran rough from cold and same this morning. Whereas it got worse as it warmed up before.
Would it be reasonable to assume if the air temperature is at fault the rough running has caused the the problem with lambda sensor?
Where is the air temperature sensor? Am I being blind or is it built into the maf?
Its definately a faulty airflow meter(judging by the faults,but i saw you had it disconected,so it may be worth checking again after clearing and a few miles),making it run rich and creating the lambda fault.
Air temp sensor part of MAF ,yes.
Thanks Alfa Tuner will take it for a drive later and see what faults come back. I recon I'm probably unlucky enough to have bought a duff maf. Second time in two weeks is good going even for me replaced a dud crank sensor with a new dud crank sensor last week
dont worry about it mate, i bought 4 used MAFs for my old mondeo and all of them were as good as dead. in the end i just put up with it as i was going to scrap the car anyway had alot of problems with that car. cam belt snapped, MAF's, oil leak. i couldnt be arsed with it in the end lol