Loss of Power
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Loss of Power
In Test driving my friends Audi that I might buy, I noticed a loss of power. It would start to hesitate a bit, then when I took it on the interstate, it stopped accelerating at 60. 5th gear, floored, and losing speed. It was like the brakes were on. Got out, and smelled STRONG metal to metal friction smell from front drivers wheel. I've been told this is probably the Master Cylinder? We know the car does have a sticking e-brake caliper, could this be it? Also, suggested inspecting the Upper Intercooler Hose. Is this just like a normal hose that I can take off and put on, or is it a vacuum? Where is it exactly?
Also, the oil sensor light in the dash will come on at certain RPMs...i think he said 2000 RPM in 3rd gear does it all the time.....it's a sensor, right?....how can i test/changeit? Thanks in advance!<p>Brian Jackson
Wisconsin
1986 Ford Escort
1971 Fiat Spider
Looking at:
1989 Audi 200 Quattro
Also, the oil sensor light in the dash will come on at certain RPMs...i think he said 2000 RPM in 3rd gear does it all the time.....it's a sensor, right?....how can i test/changeit? Thanks in advance!<p>Brian Jackson
Wisconsin
1986 Ford Escort
1971 Fiat Spider
Looking at:
1989 Audi 200 Quattro
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Joined: Mar 2000
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The e-brake is on the back...
so unlikely if your smell was from the front. Also try carefully putting your hand on the center of the wheels, the one that was dragging will be really hot. I'm also thinking that if it is only one you have a sticking caliper, rather than the master (although check all the wheels for excessive heat, if you more than one that is hot go for the master).
The upper intercooler hose is a elbow shaped hose that runs from the intercooler (the radiator like thing right in front of the engine) to the throttle body (front of the intake manifold). It like to crack on the bottom, so you have to remove it to check. It is that big piece of rubber, not a normal hose.
The sensor does sound electical, if it were bad pressure it would tend to come on at idle. I'm afraid I never had that go bad on either of my I5s, so I don't know where it is, but one of the favorite places is on the filter mount.
The upper intercooler hose is a elbow shaped hose that runs from the intercooler (the radiator like thing right in front of the engine) to the throttle body (front of the intake manifold). It like to crack on the bottom, so you have to remove it to check. It is that big piece of rubber, not a normal hose.
The sensor does sound electical, if it were bad pressure it would tend to come on at idle. I'm afraid I never had that go bad on either of my I5s, so I don't know where it is, but one of the favorite places is on the filter mount.
AudiWorld Senior Member
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There are two oil pressure switches/sensors. Either the high pressure one is defective, or .........
there is insufficient oil pressure above 2000 RPM. The "Active" Audi oil warning system, monitors the oil pressure below 2000 RPM with the low pressure switch, and above 2000 RPM with the high pressure switch.
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Brakes: You may need to replace the master cylinder...
When I got my 86 A5K a month ago, it I had exactly the same problem you are describing (loss if power as if braking while driving, followed by strong brake smell). Upon investigation, I realized that the driver's side front caliper was binding. It would release after it cooled down so I was careful not to brake hard unless necessary.
To fix the problem I started by changing the front calipers and shoes, but that did not fix the problem. Then I checked the master cylinder for free movement. It seemed OK, so I put it back in. No change. Then I replaced the master cylinder with a rebuilt unit (about $45 at Kragens - no laughing guys!) and the problem was cured... A cheap solution to a frustrating prob. I hope yours is this simple.
As for the oil sensor... It may not be just a sensor. Check the pressure at the sensor port. Check the shop manual for the procedure. If it's OK, then change the sensor. Don't make the mistake of ignoring it... If it's a turbo, you may be in for some trouble...
To fix the problem I started by changing the front calipers and shoes, but that did not fix the problem. Then I checked the master cylinder for free movement. It seemed OK, so I put it back in. No change. Then I replaced the master cylinder with a rebuilt unit (about $45 at Kragens - no laughing guys!) and the problem was cured... A cheap solution to a frustrating prob. I hope yours is this simple.
As for the oil sensor... It may not be just a sensor. Check the pressure at the sensor port. Check the shop manual for the procedure. If it's OK, then change the sensor. Don't make the mistake of ignoring it... If it's a turbo, you may be in for some trouble...
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