Car will not start first time (In the morning)

[Gherd78]

Wondering if anyone can help I recently had my car into the garage as the MIL came on and the car would not start so the guy replaced the spark plugs and leads which he says was the cause. But after a week the car is not starting first thing in the morning but you turn the key again and its fine so just wondering if anyone knows what it could be. Thinking it could be the starter motor or battery (as the battery icon on dashboard flashes when turning key) any help would be great

[jgee]

Not an expert but i think the coolant temperature sensor gives symptoms like that? But I'll leave it to the guys who know

[Ant0889]

check battery voltage should be 12-14, any less as your batteries duff.

rule out what the garage has changed but recheck everything is connected as it should with no loose connections or splits in the HT leads.

Jgee could be onto a winner with the coolant temperature switch, remove the connection from the sensor and with a multimeter check its resistance, theres two prongs from the sensor on the rounded side (4 in total), touch the red and black leads from youre multimeter to these with it set to 20k ohms, depending on the specs of the sensor you should have a reading between 1.5k to 2.5k Ohms (when the engines cold). if its reading say a higher reading its duff.

Another one to check is the crank position sensor or cam position sensor as these can cause non-start issues. depending (or both) on which your car uses, this is hard to test without a Oscilloscope but will come up if you have access to a code reader.

Edit- just re-ead your post, ignore the bit about Cranki/cam position sensor as you say it starts eventually.

Edited September 1, 2014 by Ant0889