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Vapor lock?

I have a 2003 Pontiac Vibe that for the 2nd time will not start after turning off and parking in 100 degree Texas heat. The first time, I parked it overnight and tried to start it the next morning. It wouldn’t start. I had it towed to a mechanic who didn’t really find anything wrong. He ran a diagnostic and found nothing. He also cleaned something to do with the fuel and that’s when it started again.

The second time this happened, I had been driving it for around 2 hours (around neighborhoods) and parked it. I went to start it again about an hour later and it wouldn’t start.

Could this be vapor lock? If so, how do you remedy this and prevent it from happening? Or could it be something else?Any suggestions are appreciated. Thank you.

It’s not vapor lock. If the vehicle didn’t start after sitting overnight vapor lock has nothing to do with it. But what I would have checked out is the Crankshaft Position Sensor.

The GM crank sensors are well known for causing the problem you describe. When they get hot, sometimes they work, and sometimes they don’t.


It is not vapor lock or overheated fuel lines. Parking it overnite would fix both potential issues. Fuel injected cars do not get vapor lock because the fuel system is under pressure unlike the old carb bowl which was at atmospheric pressure. You did not mention the miles but fuel filter, fuel pressure regulator. and fuel pump are the top three.

This has been an issue with the earlier Matrix/Vibe.
Google “toyota matrix hot start tsb”