Cold start problem?

AG1234567

MEMBER
2012 VAUXHALL MERIVA
1.4L
MANUAL
74,000 MILES

Hi, my Petrol vehicle listed above will not start first time from cold. Once started it runs perfectly and will start for the first time if left for a few hours just not from cold.

The only issue on diagnostic test was to replace battery which I have done (and also replaced 4x spark plugs) but still same problem.

Any help would be appreciated!

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Hi,

This vehicle isn't offered in the US, so I have little information on it. However, I will try my best to help.

What you described sounds like fuel pressure drop off. When you first turn the key on, the fuel pump is actuated for a very short time. It should produce the fuel needed to start the engine. If the pressure is too low, a delayed start can occur.

I want you to try something. Do the following when it's cold and let me know the results.

1) Turn the key from the off position to the run position (engine off) and count to 5.

2) Turn the key off and repeat step 1 a total of 4 times.

3) On the fifth time, see if the engine starts normally.

If the engine does start normally, my theory is the likely cause. At this point, I would suggest checking fuel pressure when cold.

Here is a link that explains in general how it is done:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

On the other hand, if this makes no difference, the issue could be related to a faulty engine coolant temperature sensor.

Let me know what you find.

Take care,

Joe