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Author Topic: Firts cold start failure  (Read 3616 times)

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olm

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Firts cold start failure
« on: 04 October 2021, 10:06:43 »
Hi, It's been a while since the first cold start didn't turn on, it doesn't matter if I insist, instead, on the second attempt it starts immediately. Any ideas? Some sensor?
Tnahks
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Andy B

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Re: Firts cold start failure
« Reply #1 on: 04 October 2021, 13:20:21 »
my first thoughts would be the coolant temp sensor ie the one that talks to the engine ECU rather the sensor for the temp gauge.  :-\
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Doctor Gollum

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Re: Firts cold start failure
« Reply #2 on: 04 October 2021, 15:06:23 »
Fuel pump, Pressure regulator or a leaky injector.

What happens if you turn the key to position 2 then back to off one or two times before actually cranking?

If it fires instantly then you have a fuel delivery issue.

What temperature are you considering a cold start?
« Last Edit: 04 October 2021, 15:17:45 by Doctor Gollum »
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Doctor Gollum

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Re: Firts cold start failure
« Reply #3 on: 04 October 2021, 15:20:24 »
Quote from: Andy B on 04 October 2021, 13:20:21
my first thoughts would be the coolant temp sensor ie the one that talks to the engine ECU rather the sensor for the temp gauge.  :-\
In my experience, failure of this sensor defaults to - 40°C. Cold starts are fine, but hot starts cause it to flood as soon as the pump runs. Gives similar symptoms to crank sensor, but if you pull the fuel pump fuse, it will fire of the residual in the rail ;)
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olm

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Re: Firts cold start failure
« Reply #4 on: 06 October 2021, 15:27:21 »
Quote from: Andy B on 04 October 2021, 13:20:21
my first thoughts would be the coolant temp sensor ie the one that talks to the engine ECU rather the sensor for the temp gauge.  :-\

That happened to me in another car, but I do not know if it is possible in the omega too, hence my question
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olm

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Re: Firts cold start failure
« Reply #5 on: 06 October 2021, 15:31:44 »
Quote from: Doctor Gollum on 04 October 2021, 15:06:23
Fuel pump, Pressure regulator or a leaky injector.

What happens if you turn the key to position 2 then back to off one or two times before actually cranking?

If it fires instantly then you have a fuel delivery issue.

What temperature are you considering a cold start?

The same thing happens.
Arranque en frio me refiero a temperatura ambiente tras una larga parada, generalmente de un dia para otro, cuando necesita usar el starter
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Doctor Gollum

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Re: Firts cold start failure
« Reply #6 on: 06 October 2021, 16:21:02 »
Sunrise air temperature in Maspalomas is 21°C...

Hardly 'cold'.

Also, you didn't answer my question... If you cycle the key a couple of times, does it start instantly?
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olm

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Re: Firts cold start failure
« Reply #7 on: 07 October 2021, 13:04:18 »
Quote from: Doctor Gollum on 06 October 2021, 16:21:02
Sunrise air temperature in Maspalomas is 21°C...

Hardly 'cold'.

Also, you didn't answer my question... If you cycle the key a couple of times, does it start instantly?

No, does the same
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Doctor Gollum

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Re: Firts cold start failure
« Reply #8 on: 07 October 2021, 13:09:02 »
Quote from: olm on 04 October 2021, 10:06:43
Hi, It's been a while since the first cold start didn't turn on, it doesn't matter if I insist, instead, on the second attempt it starts immediately. Any ideas? Some sensor?
Tnahks
You mean this "the same"?

Use a tyre gauge and check the fuel rail pressure before the first start.

Report back ;)
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olm

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Re: Firts cold start failure
« Reply #9 on: 06 November 2021, 11:12:27 »
Well, I have not yet been able to perform the measurement but currently it starts well the first time. Saying that now I only run on gasoline, I don't use LPG, could that have something to do with it
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Doctor Gollum

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Re: Firts cold start failure
« Reply #10 on: 06 November 2021, 11:34:41 »
Now you mention LPG ???
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Re: Firts cold start failure
« Reply #11 on: 06 November 2021, 14:04:34 »
Quote from: Doctor Gollum on 06 November 2021, 11:34:41
Now you mention LPG ???

I understand what influences the use of lpg? Do not mention it at the time because the start is on gasoline.
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Doctor Gollum

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Re: Firts cold start failure
« Reply #12 on: 06 November 2021, 15:22:29 »
It doubles all the potential trouble spots and introduces all sorts of variables into the cooling and electrical systems...

LPG is only as good as the quality of the parts and the quality of the installation.

It is, therefore, an important part of the diagnosis, especially with regard to poor starting and running.
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olm

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Re: Firts cold start failure
« Reply #13 on: 06 November 2021, 16:02:52 »
Quote from: Doctor Gollum on 06 November 2021, 15:22:29
It doubles all the potential trouble spots and introduces all sorts of variables into the cooling and electrical systems...

LPG is only as good as the quality of the parts and the quality of the installation.

It is, therefore, an important part of the diagnosis, especially with regard to poor starting and running.

So I understand that I should tell the lpg installer?
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Doctor Gollum

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Re: Firts cold start failure
« Reply #14 on: 06 November 2021, 16:11:51 »
Unless you have the diagnostic kit for the LPG ecu...

But, each installation and each installer is different... A good system fitted badly will be more trouble than a bad system fitted well.

There are several members here with direct experience of a variety of systems who might help point you in the right direction, but it ultimately boils down to how it is fitted.
« Last Edit: 06 November 2021, 16:15:25 by Doctor Gollum »
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