i30 Owners Club

2012 i30 active hard starting issue.

heaven · 3 · 4022

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Offline heaven

  • 1st Gear
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    • Posts: 2

    • au Australia
      Australia
Hi,

Ever since replacing my fuel pump which didn't need to be replaced(it aint broke but I fixed it :( ), I've had an intermittent starting issue and I've never figured out the cause.

When the car is cold there is a chance it will crank for about 10-15 seconds then start.
When the car is hot and has been sitting for 15-20 mins, for eg. when I run into the shop to grab a few things, there is also a chance it will take 10-15 seconds cranking before it starts.
When I turn the car off then back on again, it fires up almost instantly as if the problem doesn't exist which is why I figured fuel pressure.

At first I thought maybe it's a fuel delivery issue, and perhaps it still could be but I'm not sure so I've created this post to gather some advice on what I should check next.

Below is a list of things I've already done to try figure out what could be causing this issue.

  • I've replaced the fuel pump with the teabag on the end.
  • I've replaced the internal fuel filter of the fuel pump assembly.
  • I've checked fuel pressure to the fuel rail.
  • I've cleaned each injector and tested each one for pressure(they all spray).
  • I've turned the key a few times to activate the fuel pump to ensure pressure is built up.

With all of those things done, nothing has changed. A while back my car died in traffic with a p0106 error code regarding the map sensor but I haven't replaced it($375 OEM) and I haven't had that issue since(car has never died on me since owning it other than that one occurrence so possibly another issue altogether related to map sensor?)

Could it be a crank angle sensor or fuel pressure regulator that has problems? I'm not too sure what else I can check without specialist tools and I want to check everything I possibly can before getting fed up and  taking it to a mechanic lol.

Any helpful advice is greatly appreciated, thanks! :)
  • 2012 i30 active


Offline Kailan

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    • Posts: 2

    • gb United Kingdom
      London
Hi mate, I see its been a while. But did you ever find a resolution to this?
I have a very similar issue on my car. I had to replace a failed fuel pump and have had this exact issue ever since.

Cheers
Kailan
  • 2011 Comfort, 5dr Hatch, Petrol 1.6ltr, Auto, Black


Offline heaven

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    • Posts: 2

    • au Australia
      Australia
Unfortunately not. it has been like this ever since I posted this.
I'm thinking of cleaning the throttle body and replacing the map sensor (both easy to get to with hand tools) since it was throwing the p0106 fault code.

Replacing all my plugs didn't fix it, and the car does run after a brief moment of cranking, so I suspect the throttle body is gunked up or the map sensor is bad.. or both lol.
Don't go changing the plugs or the coil pack or anything fuel pump related because it has to be something else based on everything I've checked.

I've pulled the fuel pump, and O-ring so many times as I was told the O-ring might have a knick in it causing the issue, but every time I've taken it out, it looks fine, even replacing the O-ring many times didn't fix the issue.
So it can't be a fuel pump issue, I disassembled it in front of a mechanic who also said it looks fine and I was doing the correct procedure.

When I do finally fix it, I'll let you know how I go.
« Last Edit: May 27, 2024, 00:52:14 by heaven »
  • 2012 i30 active


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