My '92 Audi 100 CS just started having issues when starting. It will turn over but not fire. This has happened 3 times now. The first time I tried to start it 3 times, waited 30 seconds and tried again and the car started. About a week later the same thing happened. I tried waiting like I did before but this did not work. I waited about 30 minutes this time and it started. I drove about 9 miles and turned it off. When I tried to start it again it wouldn't work. When I came out in the morning (about 8 hours later) it started just fine. I don't know what's wrong and don't enjoy driving a vehicle that may or may not start. I just had the starter and ignition switch replaced 18 months ago and the fuel pump was replaced two years ago. Also, the car makes a clicking sound when it's on. Could this have anything to do with the vehicle not starting? It's always done that but seems to be quieter right after the oil is changed.
You're probably facing 'fuel pressure problem'. Your fuel pressure regulator doesn't hold pressure. FYI, it is located at the fuel distrbutor, has a cylindrical shape. There's a return valve that send back excess fuel to the fuel tank. A faulty FPR will cause this problem.
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How do you know your battery is good? A common mistake is to assume that if the lights, radio, etc, work that the battery must be good. A lot more energy is required to start the engine than is required for the accessories. If your battery isn't in great shape it won't turn the engine over.
Assuming you've checked that. Can you describe what happens when you try to start the car? Is there ANY noise? Clicking sound maybe? Could be the starter if you hear a buzzing noise (or no noise, assuming you do have a good battery).
Try spraying starting fluid into the intake. Remove the air filter to do this. If it starts for a few seconds then you have a fuel delivery problem. If it does not, then you have an electrical problem with the ignition. there are 3 things needed for an engine to run if it turns over. Air, Gas, Spark (fire). No air filter solved the easy air issue. Add starting fluid answers the fuel issue. Only leaves spark after that.
If it has fuel, air and spark, it only needs one more thing to fire,...compression. If it has those four things, in the correct ratio, it MUST fire. If you are 100% sure on the fuel, air and spark issue, start looking at the timing. I would also have the codes read off the ECU. Could you have " thrown " the timing belt?
If you have acess to a mutimeter check the batery voltage. Should be around 12.5 volts. also check batery voltage when trying to crank engine. Should drop to 9volts while cranking. If it dose but engine dose not turn over you know power is still going to the starter motor but its just not turning. This could be a bad conection in the starter some where.if voltage dose not drop you know power is not reaching the starter motor. this could be a bad earth to the starter from the baterty somewhere. But also listen for clunking or clicking noices while cranking which would surgest the starter is trying to turn. try this before doing any other diagnostics.hope this helps
check your crank position sensor for resistance and check if the resistance comes out to what it suppose to be.if not then you need a new one...i think the range would be 2200 to 3000ohms but i would refer that you check the specified resistance before you check it. i hope that would solve your problem