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Starting issue, it takes 2 or 3 tries until it starts?

Tiny
HOSSAMENG84
  • MEMBER
  • 2009 HYUNDAI SANTA FE
  • 2.7L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 157,000 MILES
My car has two issues which I believe are related to each other. First one, starting problem (only if hot or parked under the sun for some time), it takes 2 or 3 tries until it starts. If parked under shade or during cold weather, no starting issue at all. Second one, it has something like knocking. Only if the engine is running and not moving (in idle position). Something like misfire. RPMs starts to shake little in sudden move. Once the car starts moving, no issue and running properly. Note: Already I changed the coils, spark plugs, fuel pump, throttle valve, battery and the common rail.
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Thursday, August 3rd, 2023 AT 7:32 AM

13 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,296 POSTS
This sounds like a classic fuel pump problem, but to be sure we can do a fuel pump pressure test.

Here is a generic guide to help you step by step with instructions in the diagrams below to show you how on your car:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

and

https://www.2carpros.com/articles/engine-cranks-excessively-before-starting

Standard Value: .................... 375 - 385 kpa (3.82 - 3.92 kgf/sq.cm, 54.3 - 55.8 psi)

You can rent a fuel pressure gauge set from the auto parts store. Here is how to change the pump out in case you need it. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
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Thursday, August 3rd, 2023 AT 1:52 PM
Tiny
HOSSAMENG84
  • MEMBER
  • 10 POSTS
Already I changed the fuel pump 3 days ago. But still the same problem.
I believe you are talking about the fuel pump only. Not the sub fuel. Yes?
I uploaded 2 videos with my question. I will upload it again now for you.
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Thursday, August 3rd, 2023 AT 11:39 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,296 POSTS
Thanks for the videos. This can be a dirty throttle body or a vacuum leak.

here are two guides you can go over to help us fix it:

https://www.2carpros.com/articles/throttle-actuator-service

And use this guide when the engine is cold only:

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

Check out the images (below). Please let us know what happens.
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Friday, August 4th, 2023 AT 12:04 PM
Tiny
HOSSAMENG84
  • MEMBER
  • 10 POSTS
Yes, this is it. Thank you so much. It is a vacuum problem. I closed the valve on the vacuum line and both issues been solved.
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Saturday, August 5th, 2023 AT 8:52 PM
Tiny
HOSSAMENG84
  • MEMBER
  • 10 POSTS
The knocking issue showed up again today. Starting no problem any more. What do you think?
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Sunday, August 6th, 2023 AT 7:50 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,296 POSTS
Good job on finding the vacuum leak. Can you get a video of the noise from under the hood please?
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Monday, August 7th, 2023 AT 10:05 AM
Tiny
HOSSAMENG84
  • MEMBER
  • 10 POSTS
I didn't find the vacuum leak. I just closed the vacuum line and the starting issue been solved. But the RPM instability still exists. I believe it may be the purge control solenoid. What do you think?
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Monday, August 7th, 2023 AT 11:33 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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"Yes, this is it. Thank you so much. It is a vacuum problem. I closed the valve on the vacuum line and both issues been solved." Sorry I was confused. Yes, it could be the EVAP purge valve causing the issue. I would remove it to see if you can blow through it, if so, the valve is bad here is the location of the valve near the throttle body. Check out the images (below). Please let us know what happens.
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Tuesday, August 8th, 2023 AT 10:07 AM
Tiny
HOSSAMENG84
  • MEMBER
  • 10 POSTS
Yes. The old purge valve was defective and I could blow through it. I changed it already and so far, so good. Hope this will solve that issue for good. If any other issue comes to the surface I will update you. Thank you so much for your help.
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Wednesday, August 9th, 2023 AT 2:37 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Thanks for letting us know, we are here to help, please use 2CarPros anytime.
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Thursday, August 10th, 2023 AT 10:15 AM
Tiny
HOSSAMENG84
  • MEMBER
  • 10 POSTS
Appreciate your help. Thank you
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Thursday, August 10th, 2023 AT 10:16 AM
Tiny
HOSSAM HAççAç
  • MEMBER
  • 1 POST
Hi Ken, if you remember that knocking back again to my car. Sudden knocking or play in the RPM during idling only. Last time I had that issue and starting problem and I changed the Purge vapor control valve and the starting problem has been solved since then. Now only that RPM playing (knocking) issue.
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Monday, September 11th, 2023 AT 9:04 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Sorry, we only handle one problem per thread, please post your new question here, you must be logged in.

https://www.2carpros.com/questions/new

Cheers, Ken
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Tuesday, September 12th, 2023 AT 10:12 AM

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