Question about 1985 Audi 5000 S
Audi 5000 1985 starting problems- Ignition switch , fuse box , battery were all replaced last week. Ignition switch was replaced more than once, mechanic thinks the first replacement was faulty. Also reported a shorted wire a few months ago, around the time the ignition switch was first replaced, the wire was replaced but i was never clear on why or how it shorted, or whether the mechanics had done, or could do, a thorough check of the car's electrical systems. Only other problem with the car was a faulty vehicle temperature gauge, which had been fixed a while ago.
In order to start an engine needs a decent cranking speed, compression, timing, the right amount of fuel and a good spark at the plugs.
When an engine doesn't start, one or more of those things are missing and it is necessary to check each until the culprit is found.
If the engine has a distributor with a vacuum unit it is worth checking the vacuum unit diaphragm for punctures and if it is take a close look at the inside of the distributor cap. Sometimes they develop an invisible conductive coating.
The hall effect module can also cause some problems and the connections can also become oxidised.
If all seems ok, considering the age of the car, I suggest the fuel injectors are removed and tested and ensure the fuel pressure and volume are adequate.
Posted on Apr 27, 2017
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Posted on Jan 02, 2017
Change the coolant temperature sensor. They're known problem areas on other Audi models, including my A4. The part runs about $20 from www.ecstuning.com and it's the problem probably 75% of the time. If that's not a fix, it could be a thermostat that is stuck open and causing the gauge to never read warm.
Posted on Aug 11, 2008
there are alot of components that can throw those codes.... as a test pull one wire from the coil pack and note if the engine idle changes... replace it and move to the next one... repeat that for all cyclinders.... if you pull one and there are no changes you have likely located the cause.
Posted on Feb 23, 2009
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