Car randomly won't start sometimes

[mikeb17]

The car always cranks but sometimes it just won't start. I can bump start it by pushing it and then dropping the clutch and it runs completely normal. I was thinking a crank position sensor but hen it should run bad too. Any opinions?

[JVD]

Does it not start after getting up to temp? Like run to the grocery store, come out, and it won't start?

Need more details.

[mikeb17]

Yeah pretty much. It always starts when it's cold. It made me think of the possibility of the coolant temp sensor going bad. It should of thrown a code though.

[JVD]

Speed sensor on the trans most likely.

https://www.ecstuning.com/Audi-B5_S4...Sensors/Speed/

[mikeb17]

Yeah that's what I originally suspected (as said in my first post).

[vavJETTAw36]

You should able to watch it change in vag com while you try to start it. If no change, there's your issue


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[chris120391]

Crank position sensor, same exact thing happened to me last week. Once it started it ran perfectly fine. But every so often would not start. Crank position sensor fixed it.


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[mikeb17]

Ordered a Bosch CPS. Will install and report back.

[landfill]

When you have the car running hook
up vagcom & look at your live data for
CPS, coolant temp, speed sensors, MAF
values etc.

[wbrunner23]

you are getting nothing when you turn the key?

You should check with VAGcom before throwing parts at the car, but you may also have a bad starter (dead spot on the motor coil) or possibly even your ignition switch. I replaced both, but in my case, it was the starter.

[mikeb17]

I already logged everything and everything checked out. The car isn't throwing any codes except for some weird code having to do with the crank position sensor. I know it's not the starter because it's turning over the motor.