Question about 1993 Audi 100

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I have an 1993 Audi 100 S, that fails to start. The starter cranks, but the motor wont start. There is no spark to the plugs, and the electric fuel pump works.I have replaced the engine crank sensor, and the ignition module, as well as the coil packs.any help would be highly appreciated.

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Posted on Jan 02, 2017

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SOURCE: 1995 AUDI 90 CS - Hard to start... spark & fuel OK

Have you tried replacing the starter? I know starters can go bad if the car is not started or run for a long time.

I am getting the same car, with the same issue.. it sat for 2 yrs and won't start.

My mechanic told me it is probably a starter.

Posted on Mar 31, 2009

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SOURCE: audi 100cs does not crank and does not start

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

Posted on May 31, 2009

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SOURCE: crank sensor location

Look around the bottom of cylinder block. Or near where the flywheel is to, because the crank angle sensor works from missing teeth or magnets on the flywheel or a cog/wheel fixed to the crankshaft.Hope this helps

Posted on May 31, 2009

alicantecoli
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SOURCE: !995 Audi a6 Quattro only cranks wont start.

dealer only ,factory immobiliser is cutting in, try the spare key and if it doesnt start call the breakdown truck to take it to dealer

Posted on Aug 16, 2009

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SOURCE: 2001 Audi A4 died in traffic and won't restart

Tell to check the fuel pump fuse, and then the timing belt.

Posted on Sep 18, 2009

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Are you saying it cranks good but won't start? If so, have a helper crank it while you visually check for spark at the spark plugs. If spark everywhere, use a gage and check proper fuel pressure and fuel injector pulse. Any applicable trouble codes?
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could very well be a faulty sensor, leaky vaccum hose, bad coil packs, needing of new fuel filter, spark plugs, wires.

Have you checked your fuel pressure to make sure it is good. You can do this with fuel pressure tester on the fuel rail.

Also check every cylinder for spark
If you don't have any spark, or very weak spark, you could have bad coil pack, module, or crank sensor.

You can remove one plug at a time, and place it back on plug wire, place it on top of engine block, have someone else turn motor over well you observe to see if there is spark.

Do you have a service or check engine light on? If so, I would have the engine codes read to pinpoint exact problem area.

Let me know if you have any questions or need further help

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4 Answers

Audi 100cs does not crank and does not start


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

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Does it crank the engine ? If not take a look at the starter connections and the starter.Replace the starter if nessesary.
Ok, now that you got the most common problems out of the way, you should check for spark at the spark plugs. Remove a spark plug and attached to the wire. Get a good pair of rubber gloves and put the thread of the plug to ground and crank the engine. The spark plug should spark a bluish spark. If it has an orange spark the spark plug or wire may be bad. if it does spark fairly good.

Check the fuel pump. if it has an electric fuel pump you should hear it when you turn the switch to on. It is a whirring sound. if you can't hear it. the Pump is bad or the shutoff valve turned off the fuel system. Check it to see if the button is up. If it is then the valve clicked off. Press it down. If it is down and there is no fuel the fuel pump is bad.

If it is a mechanical pump, take off the hose to the carb if it does have one. crank the engine . It should pump gas right away.

If it does have spark or fuel to the sytem, then it is a sensor or other problem.You will have to get a trouble code for it. to narrow everything down.

Check the timing belt or chain to see if it is still good and tight. If it is not your timing belt or chain skipped or cut off. you will have to replace it.

I hope you can get some help from this info . good luck

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