Technical Cold start problem at first start

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Technical Cold start problem at first start

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Jun 27, 2018
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Hy guys from Romania!!!


I buy a few months ago a fiat 500 year 2008 , 1,4 engine,100HP,petrol.


When in warm outside the first start is ok.
When is cold outsite the first start do problems,start for 1-2 seconds and stop or start stammerer.


If i try to start the second time, it start ok.


I know little about mecanic and i clean the throttle body,and i search about IACV (idle air control valve) ho is responsible about idle start,but i dont fiind it to clean.
In a few days i''ll buy the spark plugs,are not a fortune.


Do u know what is the problem at cold start or where is the IACV if she have it ?
 

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Looks like a less common issue, I would not have thought it would be the idle control, more the cold start control, have someone with the correct software read the engine/codes and see what shows, the fact that it starts fine after the first struggle "might" be fuel enrichment when cold?
 
There used to be quite a few posts about poor starting when cold. Replacing the spark plugs usually fixes this - the factory fit OEM plugs are rubbish.

Better still, replace them with iridium plugs (NGK make a direct equivalent for the 1.4) and then you won't need to do them again for another 50000 miles. You'll get improved cold start performance, too.
 
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I change the plugs, today at 20 celcius, first start , 1 sec and die, at second time start ok.


I see at forum under the battery, a negative cable ho corrode,i loock at me and is not good condition .


If u have any ideea i am here.
 
I change the plugs, today at 20 celcius, first start , 1 sec and die, at second time start ok.


I see at forum under the battery, a negative cable ho corrode,i loock at me and is not good condition .


If u have any ideea i am here.
Replace the earth strap, if you want to rule it out use a jump lead from the negative on the battery to the engine any suitable point and try starting. There's far too many things it could be to just keep suggesting and trying?
 
Hy, i clean that cable, was bad gorund at car body segment.


Now i whait to be cool :) to see what is happent!!! If it is ok for the moment at cool ,i will chage that gorund.
 
I dont whant to buy at ebay,i am from Romania, but i will do my self (i post a picture tomorow).I have copper cable that resist hight amperage and crimping clamp.


Yes the starting is improve,i feel a diferente , but let the cool come.
 
It's not an earth problem or a spark plug problem.

If it was, the car would not run fine the second or third time you started it... it would also not matter whether it was warm or cold.. the problem would not suddenly go away.

It can only be a cold-start issue and that means the mixture isn't being adjusted "rich" when you start the car. I don't know where the sensor is that tells the ECU the temperature but that would be the first thing to check.

The ECU might also be getting the correct information but not doing the right thing... although that's probably less likely than a duff or dirty sensor.




Ralf S.
 
Another possibility is that you have a slightly leaking injector which is allowing fuel to seep into the cylinder when the engine is stopped for awhile (IIRC on the 1.4 FIRE, the fuel rail doesn't depressurise on shutdown). The excess fuel gives you an overrich mixture on initial start, often accompanied by initial smoking from the exhaust.
 
What happens if you put your foot on the accelerator/gas pedal then try starting for the first time and keep it at 1500 then release it?
Engine ecu controls all engine functions, try turn on ignition, WAIT a few seconds(put on seat belt) and only then crank/start engine
 
sorry guys , i am at work , when i come home i wiil read what u post.


In my lounch break, i do a deep search at google, and i find the idle air control how is loock.


When i go home try to clean that if is posibible.
 

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What happens if you put your foot on the accelerator/gas pedal then try starting for the first time and keep it at 1500 then release it?
Engine ecu controls all engine functions, try turn on ignition, WAIT a few seconds(put on seat belt) and only then crank/start engine






I try to put, but die at first 1-2 sec when start.
I unplug the item what i sow, butt the engine not die, that mean is not a idle air control.


I put a tester, and dont show DTC erors.
 
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I forgot something essential, my wife says , night ,after a 8-9 hours stay, the outside temperature is the same as when the car do problems.


I whait to test today,if at 8-9 hours stay and temperature is the same , and the start ok ,indicates a problem of gasoline pressure loss.


That mean pressure valve or pump assembly.


keep you up to date
 
yap, at first start was 21 temp, and the car stay about 14 hours , at first start die , at second is ok


Night at 19 temp, and the car stay about 8-9 hour , at first start is ok.
What means? ,Means the fuel presure is lost, not all but something is lost.


Responsible in the first is fuel pump presure valve,pump, maybe injectors, or a oring.


If I go to someone to verify this, it costs me three quarters of the price of a new pump and it is possible that I do not know from the first try, which means extra labor costs


So i chose simply way, i buy a new fuel complete pump, and a key tank oring remove.


In a 30 i go out to change it ...
'll keep you posted if I get away
 

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HY there!!!

We have not yet solved the problem.
It is 100% problem of losing fuel pressure.



I need if is posibile the diagram of fuel pipes to understand where to

check,from the fuel pump go to injection ramp.
 
Hi all,

I have a fiat 500 1.4 100 HP sport, from 2008, and exactly the same problem. I read the full thread, and here is what I did, still no success.

Changing to new:
-Battery (Varta Silver)
-Spark plugs (bosch iridium)
-Temp and Press sensor on the intake (new bosch installed)
-Water temp sensor (new delphi installed)
-Crank and cam shaft position sensors (new bosch installed)
-Installed new fuel pump assembly



Did by myself:
-Cleaned the throttle body, checked operation
-Doubling ground with another cable
-Checked different fuel sources, octane rating
-With OBD reader, checked parameter plausability, all looks correct
-Checked the injectors for general condition and leak, all looks good

Did a short investigation, I found out there was an ECU SW update for this model by Fiat, but at the local fiat rep they say, the system does not offer any update for my car.

I found out by myself, that the mixture is lean on start, as spraying some break cleaner on the throttle immediately before start is helping.

Do you have any ideas, how I can proceed? The car runs normally beside this, I want to fix this issue somehow.

Any help is appreciated!
Thank you!
 
:worship:Finaly i solve it


I change the fuel ramp,with al injectors and now she start ok.
That because the former owner dont drive this car, and car stay much time
not started.
 

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