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O2 sensor

Tiny
ASEMASTER6371
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The charging system will not affect the engine performance.

Do you have a vacuum gauge to check idle vacuum to see if it is timing related?

The other thing is injectors. Have you had them cleaned?

Roy
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Thursday, November 28th, 2019 AT 3:58 PM
Tiny
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I have checked timing myself and it wasn't off even by one tooth.
Injectors were removed and cleaned recently and also I have used a bottle of injector cleaner about thousand miles ago but that doesn't help either.
I have checked their resistance too from what manual says they are all good.
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Thursday, November 28th, 2019 AT 4:38 PM
Tiny
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Okay, I would still check the vacuum.

Roy
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Thursday, November 28th, 2019 AT 4:59 PM
Tiny
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I don't have one and also doubt that any dealer near here have one either but can you explain me what's the point of this test? Is there another way to test it?
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Friday, November 29th, 2019 AT 2:32 AM
Tiny
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Engine vacuum is key to engine operation. It can tell you the condition of the internals of the engine. A low vacuum will cause performance issues. Fluctuating vacuum indicates a valve issue and is also a test for cat converters being clogged.

Yes, they should have vacuum gauges in their possession. It is a basic diagnostic tool for any performance issue.

Roy
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Friday, November 29th, 2019 AT 4:17 AM
Tiny
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I don't know what to do more but don't you think if it was low vacuum problem it would show on fuel trims?I don't know what kind of problems could cause slow acceleration and slight hesitation and on other hand don't affect fuel trims. I think every problem like this should effect fuel trims but it didn't and also not even a misfire or any other codes.
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Friday, November 29th, 2019 AT 2:55 PM
Tiny
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Timing is what I am still concerned with. That is why I am asking about engine vacuum.

Roy
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Friday, November 29th, 2019 AT 3:07 PM
Tiny
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Timing checked twice and I'm completely sure it's not timing problem.
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Friday, November 29th, 2019 AT 5:46 PM
Tiny
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Okay, I am out of ideas at this time. Let me review.

Roy
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Friday, November 29th, 2019 AT 5:49 PM
Tiny
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Thanks, I will wait for you.
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Friday, November 29th, 2019 AT 10:34 PM
Tiny
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The only other thing I can think of is to call the dealer and see if there are any calibration updates for your PCM. There may be or did have an update for this issue.

Roy
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Saturday, November 30th, 2019 AT 7:08 AM
Tiny
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I will be thankful if you can do that for me.
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Saturday, November 30th, 2019 AT 11:46 AM
Tiny
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You need to call the service department near you. Give them your complete VIN number and have them check for you.

Roy
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Saturday, November 30th, 2019 AT 11:50 AM
Tiny
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I have been busy for a while. I have changed my crankshaft position sensor after that the slight hesitation is gone but the wired thing that happened a lot of time for me happened today too. Car acceleration was usual and gas tank was near empty. Then I fill gas tank with only 10 liter of gasoline and after start engine acceleration was awesome but just for about 5 kilometers then goes back to usual. I don't know what it is.
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Sunday, December 22nd, 2019 AT 12:09 PM
Tiny
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You still need to do the testing I requested.

Roy
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Sunday, December 22nd, 2019 AT 12:29 PM
Tiny
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Tiburon acceleration problem no code
finally I can say acceleration problem solved completely after purge valve replaced
so after replace o2 sensor
crankshaft position sensor
and finally purge valve
everything about hesitation or acceleration problem is solved
tiburon acceleration problem no cel
i hope someone use this thread in future and don't get stuck for about a year without any clue when there is no cel or code or fuel pressure problem. Thank you ASEMASTER6371 for helping me
tiburon intermittent acceleration problem
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Wednesday, December 25th, 2019 AT 5:45 PM
Tiny
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You are welcome.

Always glad to help.

Roy
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Wednesday, December 25th, 2019 AT 6:27 PM

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