what are the signs that your maf is starting to fail. on excelloration it starts to pick up than seems to hold back, hesitate and doesn't seem to rev freely but doesn't really hapen at night when the air temp is a bit chilly what is the best way to clean it. brake cleaner? oh and is on a 3b
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never set your expectations to high that way you are never disapointed -
sure its the maf? I'd check for boost leaks first and also maybe intake temp sensor...whenever i have driven off and not connected up the maf (just forgot) it hardly wants to go at all and like to almost stall...you symptoms sounds like boost leaks after the maf.
Good luck
Davidsigpic
1992 3b S2 Coupe -
not really sure if it is the maf at all. it was the first thought to look as it seems to be incosistant and is not so bad when it is a bit colder out side. any ideas on how to test the air temp sensor is it checked by resistance. where can i buy a pressure test kit to check for boost leeksnever set your expectations to high that way you are never disapointedComment
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AndyP on here was selling them £15
[URL="http://www.s2forum.com/forum/showthread.php?t=17820&highlight=test+kit"]
if link doesn't work(highly likely i'm useless)type test kit imto the search the kit thread is about half way down the page.Comment
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doesn't work
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93 S2 Avant Parting
91 URQ RR
02 A4 tdi AvantComment
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In fo on tesying the G42 can be found on here on s2central, obviously.
If you want to borrow a MAF, I've got a couple of working MAFs I'm not using at the moment. I've also got a pressure test kit.
I'm around Taunton fairly often, so I can drop them over sometime if you like. 
SSComment
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actually the MAF failure could appear in many symptoms,could have silly idle dropping on neutral and rising again to stabilise,could be hesitation in low revs,but nothing serious to realise it is a problem(until you replace the MAF and notice the difference).
It seems that yes,when you disconnect it completely then it judders and stutters,but the maf doesnt just go dead or work fine.There are stages in between which it could just be working partially.So if you have a replacement or a loaner,test it!!Comment
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might sound daft but check your plugs .
mine had been hesitant/ missing if u floored it when warm
,spent most of the week on the forum looking for clues and pricing sensors etc etc
changed the plugs last night ,it's like a different car .
must have been running crap since i bought it , had nothing to compare it to so had no idea(anything feels fast after 8 years in a rover diesel)Comment
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In fo on tesying the G42 can be found on here on s2central, obviously.
If you want to borrow a MAF, I've got a couple of working MAFs I'm not using at the moment. I've also got a pressure test kit. I'm around Taunton fairly often, so I can drop them over sometime if you like.
that would be very kind of you i will try and test the sensor and go from there and if i get stuck i will be in touch
dennisnever set your expectations to high that way you are never disapointedComment
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hi all i have found my problem nothing to do with the maf or a boost leak. #1 knock sensor is the cullprit. thing is my ecu didn't log a fault the only fault logged was 2121 idle valve which was from years ago. it was only when i put my spare ecu in that it showed up. is there a fault with my original ecu the battery was disconnected for months when i was repairing it i would of thought it would of cleared the old fault or is there a way to clear them? and the ecu holds more than one fault doesn't itnever set your expectations to high that way you are never disapointedComment
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Once you disconnect the battery the fault codes are lost.SSComment
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that's what i thought but it has held on to it and there is nothing wrong with the idle valve.i think i will leave the spare in and use the other for a emergancy one.never set your expectations to high that way you are never disapointedComment
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If you suspect an ECU fault, you could try it in another car to see if the fault is still there. You just need to find someone with 3B.SSComment
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i have 2 ecus one has a idle valve fault logged which i suspect is incorrect but the fault will not clear from the ecu. the second ecu had no faults logged when first checked and came up with a knock sensor fault after a run. no idle valve faultnever set your expectations to high that way you are never disapointedComment
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