I like that. It's not actually the original wire there now as that broke somewhere years ago and rather than trying to find the break hidden in the loom, I ran a new wire. Running a thick wire down the same route should be no bother and the one that's there now can be the signal.
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Can a cylinder head flow more than the exhaust can handle?
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Run the thick wire straight from the battery via a fuse.
If it was s lack of air then it would run rich.
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Fuel pump is on its way, I will sort out a relay and wiring at the same time.
I can see both arguments make sense so once fuel pump is in and relayed up, if it still runs weak, what are the options for 7A maf replacement? They don't seem to be available new any more (unlike the v6 ones) but if the signal of a new one runs out of headroom as suggested, then it would make no difference anyway...
Watch this space for updates!
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When you say breather do you mean the connection to carbon canister? It's funny you should mention that. I get the blue solenoid clicking but the black one doesn't that I've heard. I also don't get any vapour type smells coming out of it. Like many others out there, I do get a whooshing noise as I undo 6ue the filler cap. What would be the issue with pressurised tank / lack of breather?
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Perhaps that's a question UrS4boy would likely be able to best answer, he did a detailed article here (but his attachments have mostly disappeared):
https://forums.quattroworld.com/s4s6/msgs/141611.phtml
Tank vent sys.png
Perhaps your N80 valve does not function? You could test it.
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Hmmm. It's something I shall look into but it cant be a vacuum if air rushes out of the filler cap? If it was a pump sucking out of a sealed tank I would see where the vacuum could happen but, It's also getting 2 litres a minute back into the tank down the return line.
I'm going to plug a test lead into the black solenoid wiring and see if it lights up while driving. It doesn't activate on idle. The. Blue solenoid next to it clicks like the clappers once the engine is hot.but it can't be feeding anything to the engine as it itself is fed from the back solenoid which I have never noticed open. It works with 12v to it so either the wiring is faulty or it just doesn't open very much at idle!
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Point is, it still uses fuel, so on aggregate, there is less fuel in there after running = vacuum.
It can depend on weather, on hot days or maybe a long run, the fuel, and air in the tank will heat up, causing excess pressure.
But in todays weather, vacuum is more likely.
Run it with the cap loosened off for a testLast edited by Bowie69; 13 November 2018, 09:28.
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The evap system on the S2 applies vacuum to the tank on overrun to draw off petrol fumes. That is when the revs are up and the throttle is closed ie. when decelerating. It stays closed at idle so as not to upset the mixture.
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