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Starting problem when warm - troubleshooting


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Hi,

I have a 99 Carrera US model with 74k miles (30k on the motor).

Here's my problem:

- It will not start when it has warmed up.

- The motor turns over just fine but it does not start at all, not even a sputter.

- After letting it cool for 15 minutes it starts right up.

I thought maybe the plugs were worn so I replaced those and threw in a new air filter. This didn't help at all.

I suppose I need a diagnostic tool to hook up when it's not starting but I don't have one, Any recommendations on an ODB tool?

Are there any troubleshoot steps I can take or likely suspects?

Thanks for the helpful forum.

Tim in Santa Clara, California

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Use Durametric software on a laptop to do diagnosis.

Sounds like a car I recently had where the crankshaft position sensor would get hot and open up. When the CPS is open (or not present) the DME thinks the engine is not turning over so it never turns the fuel supply on.

There should be a fault code there when you have the problem - but perhaps not when the engine is cool.

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Use Durametric software on a laptop to do diagnosis.

Sounds like a car I recently had where the crankshaft position sensor would get hot and open up. When the CPS is open (or not present) the DME thinks the engine is not turning over so it never turns the fuel supply on.

There should be a fault code there when you have the problem - but perhaps not when the engine is cool.

Thanks for the quick response,

The CPS was next on my "shotgun" approach list. Where is the CPS located?

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