Classic Audi Community General Chat » Need help guys 2.3ng

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Old 23-12-20, 10:55 AM   #1
xxErix
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Default Need help guys 2.3ng

Hello

So, I daily drive a Audi coupe 80 B3 2.3ng, 1990, i have changed bunch of parts, and basically just doing it up to the way I see it... it has been running a bit rich, and idle has been a bit rough but nothing crazy.
But two days ago, I went for a shopping trip, and then outside the store, I started it, and it was barely running, and when I pressed the throttle, it just died, and after a few times trying it, worked fine. (also I noticed that the radiator FAN has been on all the time, I think its the coolant temp sensor, which has been ordered)
So for the rest of the day its running fine, until same thing happened in evening.
Yesterday, again seem to be okay for most part, untill later on in a day, and when driving home in evening, I noticed that the throttle is not as responsive, like I will press it half way, and it will barely pick up, and then when i press it more, it just goes almost like wide open.

anyone has experienced anything like it? any help would be appreciated,

also anyone know where I could possibly get Kjet tunned so its not running as ritch?

Thank you
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Old 23-12-20, 12:55 PM   #2
mikes2
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The temp sender for the fan is at the base of the radiator and will not affect the engine running issue.

Are you sure it's fuel ?

The ignition leads, rotor arm, plugs, distributor cap and timing are all good ?

I had similar issues with my 90 running K-JET. It was a combination of bad connections and timing / mixture adjustment.

It was the vacuum switch on mine which was preventing cold enrichment - just bad contacts.
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Old 23-12-20, 01:53 PM   #3
xxErix
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well, when it was struggling to run, it was also smoking white smoke and smelling like petrol, so we were thinking its something to do with that, but again, dont really know, I just went for a drive, seem to idle ok for most part, maybe a bit low at times, and did seem to pull alright, takes a bit longer to start though
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Old 23-12-20, 05:06 PM   #4
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Petrol smoke is usually grey. White I would expect to be coolant.

Does the oil smell of petrol and at a high level ?
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Old 27-12-20, 11:43 AM   #5
xxErix
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when it was smoking, it was smelling properly of petrol, ive not really smelled the oil,

weirdly, yesterday , when it was cold it was runing fine, then did like 20mile drive, stopped for 1h or or so, and then when I started it, it struggle to idle for 1-2mins, and when i just put the foot down, after a few seconds of revving it seems to go back to normal, really odd


also , my fan is on all the time, ive changed the coolant temp sensor, but it still seem to be on all the time? is there any more sensors or something?
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Old 27-12-20, 11:57 AM   #6
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Silly question, not a dodgey batch of fuel is it? I’ve had that before with similar results. And, the rallycar is currently laid up so the fuel (with stabiliser) is getting old and that’s now lumpy with grey smoke due to dead fuel.
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Old 27-12-20, 12:12 PM   #7
xxErix
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to be fair, that kind of has crossed my mind, but what are the chances of that happening? haha
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Old 27-12-20, 12:54 PM   #8
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Weeelll, theyre selling less and its rather wet out there...

Id be tempted to put a couple of gallons in and some fuel injector cleaner. Wont hurt either way.
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Old 27-12-20, 01:56 PM   #9
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How old is the fuel filter?

Mike has suggested you check the HT side of things, even if you can't check the resistance of the leads it'd be worth removing the leads from the cap and checking for corrosion at the ends, likewise at the coil and plugs.
A visual check of air pipes and hoses as well as electrical connections to the various fuel related parts ?

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Old 28-12-20, 09:50 AM   #10
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If it’s starting poorly and smelling of petrol at that point I’d be thinking that it’s getting enriched at start up when both hot and cold.
When it’s cold, it needs that extra fuel so runs happily, when hot it doesn’t so runs like a pig, when you touch the throttle you add more air and more fuel and it stalls.
I suspect you’ve got a fuelling issue.
If the problem was only at start up and it was running well otherwise, then it’s just the autoenrichment (the autochoke for want of a better term) if running poorly all the time then either it’s set too rich or there’s a fuel system problem in done other form (failing component, air leak, etc etc)
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