Question about 1985 Audi 5000 S

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Audi 5000 1985- starting problems

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.

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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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SOURCE: Audi A3 2002 model auto - temperature gauge not working

Change the coolant temperature sensor. They're known problem areas on other Audi models, including my A4. The part runs about $20 from 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.

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SOURCE: Petrol gauge faulty on audi a4 2001

Most likely the sending unit for the guage is defective, it is located in the fuel tank.

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SOURCE: electric fan

Which fan are you referring to, the electric fans for the cooling system, or the air blower fan inside the car as part of the climate control?

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SOURCE: Ignition coils on 2005 Audi S4 cabriolet

If you replaced the coils the spark plugs should also be change. The plugs are more than likely bad.

Posted on Jan 29, 2009

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SOURCE: OBD 2 code showing 300 & 301 cylinder misfire

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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The starter is malfunction at this time. it could also be a ignition issue as well. here is a quick starter test procedure that will help you troubleshoot a bit.

Step 1
Check for 12 volts on the large wire attached to the top terminal on the starter relay. It should have battery voltage. If not, the battery, terminals or wire is bad.

Step 2
Check the small wire on the solenoid for power when the key is in the start position. Remove the small wire on the solenoid and have a helper hold the key in the start position. Check the wire for battery voltage. If there is voltage, the starter is bad. If there is no voltage, replace the wire.

Step 3
Check the fuse in the fuse box under the hood on the left fender well. If it is good, check the relay by pulling it out and checking for power at one terminal with the key off. If there is no power, the problem is in the fuse box between the fuse and the relay. If there is power, have the helper hold the key in the start position once again and check for power at another terminal from the ignition key. If there is power, the relay is bad. If there is no power, the starter circuit is suspect.

Step 4
Check to see if there is power to the neutral safety switch if there is no power at the relay. Use the voltmeter to check for power with the key in start. If there is power going in, check for power going out. If there is no power going in, the security system or ignition switch is suspect. If there is power going in and none coming out, the switch is bad. If there is power coming out, the problem is between the neutral switch and the relay.

Step 5
Remove the cover on the bottom of the steering column. Check the solid yellow wire for power when the key is in the start position. If there is no power, the ignition switch is bad.

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