Having problems with your 1993 Audi 100 ?

Audi 100s 1993 cranks doesn,t start, turns over no start. when it starts runs rough and stalls.

Posted / edited by AnonymousUser on : 19-10-2020

Answers :

Assuming fuse and fuel relay are good, if need them, get them from junk yard for nothing, check if you getting fuel and proper pressure and sparks, by unplugging the fuel line from the filter and point the hose downward away from face and have a friend turn the engine over, no fuel come out of the line, crank sensor or fuel pump faulty, if fuel pump is good than the crank sensor is faulty. crank sensor tell computer to turn on the fuel pump. to check sparks, pull one plug and ground it have a friend turn engine over see if you getting sparks, no sparks, check cap contact,rotor contact and wires, if it looks good, check the coil, make sure you getting power to it and have 12v output, if good, cam sensor is faulty, cam sensor work the same way as crank sensor but tell computer to send sparks to the distributor. Common problems with older european car, crank and cam sensor tend to go bad due to ages and heat abuse.
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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