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I’ve been driving my Audi 80 recently and for no reason it just starts to slow then all the speeds comes at once. Sometimes it will slow to a stop completely.
I replaced a couple of rubber hoses and that seemed to alleviate the problem. However it’s come back.
Does anyone have any ideas what could be wrong or what to look out for?
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Last Edit: Jan 17, 2020 13:54:25 GMT by edwardbear
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tristanh
Part of things
Routinely bewildered
Posts: 990 
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A few more details about the age and running gear might help.
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Whether you believe you can, or you cannot, you're probably right.
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Audi 80
2.0e
4 cyl
I believe its the ABK B4
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It's really intermittent, which I don't understand either. I did 2 20 miles journeys last night. It did it for a couple of seconds on the the first trip, then at the last minute on the way home on the second trip.
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tristanh
Part of things
Routinely bewildered
Posts: 990
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Throttle position sensor?
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Whether you believe you can, or you cannot, you're probably right.
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Jan 10, 2020 13:00:42 GMT
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How would I assess that?
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Jan 13, 2020 10:11:45 GMT
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When you say it "slows", is it road speed or engine speed that is slowing? Does the engine appear to lack power, or if you dip the clutch when it's slowing will the engine rev cleanly?
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Jan 13, 2020 18:10:58 GMT
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It’s weird. It will slow down and the revs will go down really low. So both I suppose.
I can then lower the clutch and bring it back a bit. Sometimes it will go back to normal or slow to a stop.
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Jan 13, 2020 18:22:39 GMT
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Servo in its death throws?
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Jan 13, 2020 18:25:53 GMT
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I’ve not checked that. How do I check that?
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Jan 13, 2020 18:36:36 GMT
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If it was the (brake) servo, the way to check it is to remove the vacuum hose from the servo and plug both open ports up. (ie a bolt down the hose end and some kind of improvised cap on the servo port).
If it's a servo issue the problem will not occur while driving like that. Be advised though the braking behaviour will change, with a much firmer pedal, so take it easy!
I had similar with a couple of servos in the past. The revs drop, the engine runs rough, can only go slow because the servo is leaking away vacuum. Hellish in slow moving traffic but can also slow the vehicle right down at speed too. If it's been doing it a while you might also find your brake fluid is lower than it usually is.
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Jan 13, 2020 18:39:34 GMT
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Which rubber hoses did you replace?
Are you sure it isnt a fuel supply blockage? I take it its fuel injection... could be a bit of grot in an injector?
The fact you say the power surges back doesnt sound like a servo problem as it would just recover, not surge (unless you are mashing the pedal to try and wake it up again)
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Jan 13, 2020 18:42:25 GMT
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When last was the fuel filter changed?
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Phil H
Posted a lot
Posts: 1,448
Club RR Member Number: 133
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Jan 13, 2020 19:28:15 GMT
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Normally (insert caveat here) if it feels like someone’s replaced the throttle with a piece of knicker elastic, it’s fuel. If it’s like someone’s turned the key without you looking, it’s spark.
Causes for fuel (which is what it sounds like - but that includes air; basically the mixture goes to pot) are many and varied; blocked filter, sock floating in the tank, failing pump relay, duff pump, water in the tank, soggy air hose, split in air ducting, sticky pressure regulator valve, etc..
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Jan 13, 2020 20:59:10 GMT
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I replaced the fuel filter last night. Just went to take the car out and the fuel was leaking out. I did the bolts up as tight as they would go. I did put a bolt either side of the fuel pipe. Not sure if that was the right position.
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Phil H
Posted a lot
Posts: 1,448
Club RR Member Number: 133
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Do you mean copper (could be fibre or aluminium also) washer and did you fit new ones (as you should)?
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 Definitely the new washers |
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Jan 15, 2020 20:27:08 GMT
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So went back under the car tonight, tightened the bolts up super tight. Nearly gave myself a hernia.
Zero petrol curse word out - win!
But the lord giveth and the lorded taketh away. The exhaust has seen better and is next on the list.
I’ve been quoted £350 for a full exhaust by my local parts shop. However I’m tempted by the full exhaust from cat for £65 on eBay. What say you?
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Jan 16, 2020 11:30:53 GMT
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Jan 16, 2020 11:34:46 GMT
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