Will not start after sitting for couple of hours

KIERANB

MEMBER
2008 VAUXHALL ASTRA
1.9L
TURBO
MANUAL
150,000 MILES

Hi, my car won't start after being left over night or for a couple of hours. We have changed battery and alternator seemed to work, but I drove work today fine left it couple of hours and now won't start.

Wednesday, September 8th, 2021 AT 10:11 AM

4 Replies

SQM

MECHANIC
6,383 POSTS

Hello,

This intermittent no start can be due to the coolant temperature sensor. I have seen many of these vehicles will have no starting issue and not have any other obvious symptoms.
The coolant temperature sensor can go bad and provide incorrect reading to the ECM. It can send a signal that could mean the engine it "too hot" to start and it will not start the engine.

https://www.2carpros.com/articles/how-a-coolant-temperature-sensor-works
https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor

During the no start issue, does the engine cranks over? or when you try to start it nothing happens?

Let me know.
Thank you.

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Wednesday, September 8th, 2021 AT 6:34 PM

KIERANB

MEMBER
3 POSTS

Yes, it cranks then it turned over. We got jump start from work and it started this morning but not straight away.

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Thursday, September 9th, 2021 AT 4:15 AM

KIERANB

MEMBER
3 POSTS

Also the battery had a green light on when we brought it 1 month ago no it doesn't.

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Thursday, September 9th, 2021 AT 4:41 AM

SQM

MECHANIC
6,383 POSTS

You might want to get the battery load tested. It could have a bad cell.
If you are able to start it by jumping it then you could just have a weak battery.

https://www.2carpros.com/articles/car-battery-load-test

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Thursday, September 9th, 2021 AT 7:06 AM