Hard start issue

Tiny
ANTHONYKING
  • MEMBER
  • 2015 HYUNDAI I10
  • 1.0L
  • 3 CYL
  • 2WD
  • MANUAL
  • 48,000 MILES
Hi. I am after some advice regarding my daughters car listed above mk2 1.0 i10. It has a very poor tick over and sounds like it’s going to stall all of the time even when cold. I took it to a garage to get checked out and they replaced the injectors, the spark plugs and a lamda sensor then pretty much gave up and said I need a new engine. Sadly the car was sold as seen when I bought it and I put the poor tick over down to it being sat for a year. Any help would be appreciated. Some additional info
it has a full service history but last 3 where back street garages. Apart from the idle issue it’s in good condition.
air filter is new and the new plugs where fitted before I bought the car.
when accelerating it’s fine and it feels like it has the right amount of power once it gets going and it never misfires.
Lots of videos of similar issues but that’s the mk1 engine. Mine is the mk2 so not sure if it's applicable.
Monday, September 13th, 2021 AT 4:48 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Hi,

This model vehicle isn't offered in the US, but I will try my best to help.

If the vehicle seems like it is ready to stall all the time, first check for engine vacuum leaks. A leak will cause a rough and low idle.

Here is a link that shows how that is done:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Also, take a look through this link. It discusses how to service an IAC. IAC stands for idle air control. This is responsible for maintaining the engine's idle speed.

https://www.2carpros.com/articles/idle-air-control-valve-service

Let me know what you find or if you have other questions.

Take care,

Joe

See pics below.
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Monday, September 13th, 2021 AT 8:23 PM
Tiny
ANTHONYKING
  • MEMBER
  • 2 POSTS
You mentioning vacuum rang a bell. The garage sealed the inlet manifold as they thought that was the problem and the vacuum in the manifold is too high. See below for the diagnosis the garage game me and the readings of a good car written in pen.
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Tuesday, September 14th, 2021 AT 5:23 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Hi,

I'm not sure how it's being read. We use a G/M (grams per minute) to identify if the mass airflow sensor is working. I can tell you that a mass airflow sensor out of calibration may rise too quickly in reaction to an RPM change. This could cause an acceleration problem.

If the pressure is too high, I would suspect the sensor (MAF) is bad. If possible, ask if they checked the engine vacuum with a vacuum gauge. If they did, ask what the reading was. It should be around 18 inches of vacuum.

Let me know.

Joe
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Tuesday, September 14th, 2021 AT 7:15 PM

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