Question about 2005 Hyundai Sonata

1 Answer

Hyundai sonata 2005 model is not starting properly. Recently changed fuel pump & filter, spark plugs,and air filter. One week back I cleaned fuel injector . After that I got this problem. If I am stopping my engine after a drive , I can start it again. If I am keeping my engines witched off for 20 minutes , then I am getting the starting trouble. Self motor is working for a couple of seconds and getting started. Please advise me

Posted by on

  • sudhikaranat Mar 22, 2011

    I serviced fuel injector by removing it from engine. It was done by a authorised service guy. No fuel lekage from injector. Car running smoothly, I am getting problem only for starting. I think fuel is going back to fuel tank when I am stopping car engine.



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 184 Answers

Why was injector cleaned?was there problem already that caused you to clean them?just one or the all of them?and was it done on the car or were they removed to clean?How were they may have an injector leaking and when left it floods a cylinder making it hard to start.check everything that was removed,look for any leaks or listen when idling for air leaks.You have not mentioned how it runs,whether it is rough or down on power,this will help us to track fault better.May be check that all the injector plugs are on the right ones.hope this helps.

Posted on Mar 22, 2011

  • Peter da techmen Mar 22, 2011

    ok,this fuel system runs in a loop.the fuel is held on pressure by a non return valve in fuel pump,the injectors being closed at rest,and the fuel pressure regulator being closed.If you are sure that the system is not bleeding out pressure through the injectors(symptom would be hard starting,with roughness until the cylinders cleared of fuel).the fault should only be at the pump or the regulator.The easiest way to fix most regs of leak is to 'pulse'the fuel pressure while the engine is running.The regulator lies at one end of the fuel rail,it will have a small vacuum hose to it as well as the fuel line running back to the an area of this fuel line that is rubber(will not work on steel,rigid pipe),squeeze it flat while the engine is running,and release,doing this 6-10 times.only hold flat for a second or 2 before releasing.This will usually cause the valve face internally to snap shut and open clearing the face of any contamination.I am unsure if your model is the same as the one we have here.the newer type engine they have is a little different in setup.Again though,I have seldom found a problem of this nature not caused by an area of the fuel system that was disturbed,not being assembled properly.Make sure that all electrical plugs have been reconnected to every sensor.If you have 2 pairs of vicegrip pliers.Stop engine.squeeze shut both the fuel delivery and fuel return hoses where they are rubber.leave for time you know causes start up problem,immediately prior to starting again,remove both pliers,if it is still hard to start,pressure is not leaking back to tank but into engine most probably.if it starts well,repeat test on just one of the lines.a failed start or good start will indicate which side is leaking pressure,pump or regulator.Hope this solves the problem for you



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Sonata spark plugs

here you go

Hyundai Sonata Spark Plug - AutoZone
  1. Cached
On modified performance engines, it's generally best to use a colder heat range plug. Old spark plugs for Hyundai Sonata often produce a rough and jittery ...

Hyundai Sonata Spark Plugs - Spark Plug - Denso NGK Bosch - 2011 ... > Spark Plugs > Hyundai Spark Plugs > Sonata Parts
  1. Cached
  2. Similar
Rating: 5 - ‎25 reviews Spark Plugs produce the spark for fuel combustion in your vehicle's engine.

How to Change Spark Plugs on Hyundai Sonata - 4 cylinder - YouTube

2q==? 5:08
  1. Similar
Apr 13, 2014 - Uploaded by HappenToLife This is a how to video for changing spark plugs on a Hyundai Sonata. The car in the video is a 2007 model ...

Hyundai Sonata Spark Plug - Auto Parts Warehouse > Hyundai > Sonata > Spark Plug
  1. Cached
  2. Similar
BOSCH PLATINUM+4 SPARK PLUGS. Engineered with advanced surface air gap set-up for prolonged, more powerful spark; Features platinum center ... sonata spark plugs Google Search

Apr 14, 2017 | Cars & Trucks

2 Answers


Something intermittent is wrong with your fuel delivery system - fuel pump, fuel filter, fuel pressure regulator, check valve.. If it always starts when you use starting fluid that eliminates spark/igniter issues. Check all electrical connections in fuel delivery components.

If the ecm is touchy it might not be sending the signal for the injectors to shoot gas into cylinders.

But I think you have a bad connection somewhere along the line.
BTW, great car - have one also. But my dealer sucks.

Nov 13, 2015 | 2011 Hyundai Sonata 2.4

1 Answer

Idle Problems

IAC Idle Air Control --solenoid valve near the
throttle body

He can remove it & try cleaning it or replace it,IF it is just
an idle control issue

You can not have spark plugs in the motor for years

They should be changed every three years & clean any
ignition rotor & cap, if you even have that,may not

If you have never changed the oxygen sensor, that would help
Clean MAF Sensor & replace the air filter

Keep in mind that fuel pumps do fail,so don't run it out of fuel
& expect that some day if you have starting issues, to check for
a good battery & then fuel pressure at the motor

Mar 14, 2014 | 1999 Oldsmobile 88

1 Answer

2000 hyundai sonata won't start on the first try

Could possibly be a weak fuel pump.

Aug 30, 2017 | Cars & Trucks

3 Answers

Fuel filter

where is the fuel filter located on a 2000 Hyundai Sonata?

Oct 20, 2009 | 2005 Hyundai Sonata

2 Answers

Hyundai sonata 2003 v6 what do i need for a tune up.

A tune up is generic. i don'y have specific part numbers or anything, but a tune-up generally consists of:
Spark Plug replacement (6 of them)
Spark Plug Wire replacement (6 of them)
Fuel filter replacement
Air filter replacement
On older vehicle, one would check all the components that involve spark, such as distributor cap & rotor. You might not have these, yours may be computerized, no service required until it fails.
A tune up would also include a review of all recommended service items as noted in your owners manual. Some of these might be mileage related. Such as, timing belt & transmission fluid replacement.
I normally do not do tune-up's unless the vehicle is having a problem. If you end up taking your vehicle to a mechanic to diagnose a problem, he will suggest many of these items before beginning his diagnosis.

Oct 05, 2009 | Hyundai Motor 2003 Sonata

Not finding what you are looking for?
Cars & Trucks Logo

386 people viewed this question

Ask a Question

Usually answered in minutes!

Top Hyundai Experts


Level 3 Expert

80339 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8841 Answers

Are you a Hyundai Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides