I have a boost problem in my urs4 an I want to know if MAF can hold boost if it is not working properly.I unpluged the MAF and boost was a litlle better than with it on but it s feel like I have a restriction wich is coming and going .
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I had the same issue with my S2 ABY, it would rev to around 3,000rpm with MAF plugged in. With it unplugged it'd rev to 4,500rpm. It turned out that it was a boost leak (or two), it was managing 0.2-0.3 plugged in, and about 0.4bar unplugged.
Check all your induction hoses before buying a MAF. I bought an RS2 item without checking my pipes properly, and I was furious I'd splashed out near £200 without curing the problem. If it is your MAF, I have a used (125,000miles) standard S2 item which I no longer need if you're intested in a cheap, quick fix. Otherwise, if it is your MAF and you have an ABY engined S2, then get an RS2 item, they're a direct fit, give slightly more power (apparantly) and I found they cost less too by around a ennerAudi 80 S2 Nothelle N300 Avant, 1993, Amethyst Pearl VW/Audi Car Magazine article about this very car
Audi A6 Avant 2.5 TDi, 1995, Arctic Silver (now sold)
BMW E36 325i Coupe, 1993, Diamond Black (now sold)
VW Polo 1.0L 6N, 1998, Red (the missus' car)
Aprilia Rs250 motorbike, 1998, Black (the weekend toy) -
Don t have problem rev up too 6500 or 7000 but boost is coming and going.Comment
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I think I have a similar problem at the moment and my pcv valve is leaking air under test, I think this is down to a one way valve up by the top of the bulkhead - part of the vac tube setup off of the I.M
Give yours a check might be...might not be.Volcano ABY coupe
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Top of bulkhead???Do you have any pictures to make an ideea??Comment
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looking at the engine front on its to the right of the inlet manifold a little plastic valve half one color and half another I think black and white but can't remeber now.Volcano ABY coupe
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