Hard time starting

WRENCHTECH

MECHANIC
20,761 POSTS

The keyless entry and the immobilizer are 2 completely different systems and neither one will prevent the key from turning the lock.
The burglar alarm system is controlled by the keyless entry but it should be obvious if that is triggered. One particular situation of a defective alarm relay could cause a no start.

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Friday, December 18th, 2020 AT 11:06 AM (Merged)

HSAAGER1

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17 POSTS

The 2nd option I'm very sure is what's happening. I am not able to open the trunk with the remote. Just the key and I always have to disarm the alarm first or it goes off
Now if the security system will cause a no start situation, would the engine even be able to crank but not start?

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Friday, December 18th, 2020 AT 11:06 AM (Merged)

WRENCHTECH

MECHANIC
20,761 POSTS

You're just beating a dead horse here. There are dozens of possible reasons for a no start but until you determine which functions dropped out, you're just spinning your wheels. You can spend a fortune throwing parts at the problem with no success.

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Friday, December 18th, 2020 AT 11:06 AM (Merged)

HSAAGER1

MEMBER
17 POSTS

I am just trying to narrow down the options to get to the bottom of this.
In this case of the alarm system creating a no start issue, would there be any power to the car or would that not work either?

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Friday, December 18th, 2020 AT 11:06 AM (Merged)

ALBUNDY

MEMBER
2 POSTS
2002 HYUNDAI SONATA
4 CYL
2WD
AUTOMATIC
70,500 MILES

When ever I fill up the car, it very hard to start, it turns over many times like it is not getting gas. And if it does start it will not idle by itself. Once I have it running for a couple minutes it will start fine and run fine unitl I fill up with gas again. I am thinking it is the pressure in the gas tank needs to build up to run. But would that be because the fill filter is getting clogged? Or the fuel pump is not working correctly, or somthing else?

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Friday, December 18th, 2020 AT 11:06 AM (Merged)

KHLOW2008

MECHANIC
41,814 POSTS

Hi alBundy,

Thank you for the donation and sorry for the delay in answering.

Your problem seems peculiar and the is no technical explanation for such a problem. There are no neccissity for any pressure buildup etc to restart after refilling.

Did the Check Engine Lamp shows anytime while driving?
Did you try to retrieve for Diagnostic Trouble Codes?
I would sugget trying the following if it helps. Before starting, turjn ignition switch ON for 2 secvonds and OFF, turn ON again for 2 more seconds and retry starting. Let me know if there are any difference.

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Friday, December 18th, 2020 AT 11:06 AM (Merged)

ALBUNDY

MEMBER
2 POSTS

I have taken the gas cap off to release the pressure and then I started the car just fine. I then went to a gas station and fill up and they tired what you suggested. To the Car to the on position but not start it, let it sit for 2 sec, I then turned the car off and turned it back on and it still started hard. I would turn over but No gas was getting to the engine. Even when it started it would not idle be itself. I would have to give it gas and wait about one minute then it would idle by itself.

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Friday, December 18th, 2020 AT 11:06 AM (Merged)

KHLOW2008

MECHANIC
41,814 POSTS

Seems something is causing the fuel pump not to work when fuel is added to tank. I would suggest checking if there are any contaminants in the fuel tank. They could be churned to affect the fuel pump when refilling.

Apart from above, I could not find any other data or reasonable cause for the problem.

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Friday, December 18th, 2020 AT 11:06 AM (Merged)

JXC5379

MEMBER
1 POST
2002 HYUNDAI SONATA
4.2L
4 CYL
FWD
AUTOMATIC
164,000 MILES

I tried starting my car is was hesitant and bucking a bit as well and the idle speed was bouncing around, wouldnt stay running almost as if its choking I gave it more gas and still it would Buck and the eventually not turn over I had a PO 171 code I've already changed m.A.F. Sensor and don't see any cracks in vacuum line. I would like to know what the real problem is so I can fix it. Please help thank you Joe

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Friday, December 18th, 2020 AT 11:06 AM (Merged)

HMAC300

MECHANIC
48,601 POSTS

171 can be caused by a lot of things, but check fuel pressure with a gauge auto parts rent it. Low fuel pressure is one of the causes. And a lot of times the main cause

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Friday, December 18th, 2020 AT 11:06 AM (Merged)

2CP-ARCHIVES

MEMBER
4,540 POSTS
2001 HYUNDAI SONATA
4 CYL
2WD
AUTOMATIC
78,000 MILES

2000 Hyundai Sonata mileage: 78,000. Thanks for taking the time to answer my question. My car is very hard to start. The only way to start it is to start it and not give it any gas for a minute or so. It takes six tries before you can get it to stay running. It has a service engine light on the dash and disconnecting the battery cable has not eliminated the light. Once started it runs fair but it cuts out as if it is running lean. The problem seems to be getting worse. We do not have a local dealer. Any input you can give me will be appreciated.

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Friday, December 18th, 2020 AT 11:07 AM (Merged)

2CP-ARCHIVES

MEMBER
4,540 POSTS

The service engine light indicates a problem in the computer controlled engine management system. We recommend a scanner that you can use to scan your computer for faults or error codes. The information should pinpoint the malfunctioning component. Once you have made the repairs you can use the same scanner to clear the check engine light.