Check engine codes, emission monitoring, and revving issue - New Tiburon Forum : Hyundai Tiburon Forums
 
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post #1 of 10 Old 07-11-2019, 12:20 PM Thread Starter
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Check engine codes, emission monitoring, and revving issue

The vehicle is a 2003 Hyundai Tiburon V6 GT 6MT

I currently have four check engine codes that disappear on their own and randomly pop up.

Two current faults are:
P0171 - Power Train
P0174 - Power Train

Pending codes are:
P0102 - Mass or air flow circuit low input
P0123 - Throttle/pedal position sensor/Switch A circuit high input

I've driven my car for more than 500 miles and the catalyst, evaporative system, O2 sensor, and O2 sensor heater remain incomplete.

The revving issue usually happens after I've been driving for a few minutes and whenever I come to a stop or put my vehicle into neutral from gears one through six, my RPM randomly fluctuates. Sometimes it's hovering around 1500 rpm or at about 3100 rpm, I usually turn off the engine or I shift into first gear and I release the clutch pedal half way through and hold it there while at a stoplight to avoid overheating the engine. I've gotten this problem fixed by a mechanic and I still have the paperwork so replacing that same part might resolve this issue.

Overall, I would appreciate feedback regarding the check engine codes and incomplete monitor sensors.

I've also noticed that while driving, it's difficult to shift gears into neutral, and sometimes I have to force a shift into neutral because there's a small budge in the way.
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Last edited by mo1kd; 07-11-2019 at 03:18 PM.
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post #2 of 10 Old 07-11-2019, 01:00 PM
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Re: Check engine codes, emission monitoring, and revving issue

which part did you replace? was it an OEM part?
sounds like MAF is bad or you have a leak near accordion hose that goes to throttle body.

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post #3 of 10 Old 07-11-2019, 02:39 PM
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Re: Check engine codes, emission monitoring, and revving issue

Check your connections, especially the Idle air control. And make sure that you did not get certain connectors in the wrong places. I found out the hard way years ago that many of the connectors are the same and allow you to get them mixed up. Good luck.
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post #4 of 10 Old 07-11-2019, 02:55 PM Thread Starter
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Re: Check engine codes, emission monitoring, and revving issue

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Originally Posted by aveenav View Post
which part did you replace? was it an OEM part?
sounds like MAF is bad or you have a leak near accordion hose that goes to throttle body.
I'll have to check the paper work, and I'll get back to you on that.

I edited my post and added that my vehicle is an 03 Tiburon GT V6 6MT.
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post #5 of 10 Old 07-11-2019, 03:21 PM Thread Starter
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Re: Check engine codes, emission monitoring, and revving issue

I made a few minor edits to my initial post for clarification purposes.
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post #6 of 10 Old 07-12-2019, 06:23 AM
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Re: Check engine codes, emission monitoring, and revving issue

Are you the original owner of the car? What work has been done recently? How many miles on it? When was last timing belt change? Your not giving us much information to go on here.

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post #7 of 10 Old 07-12-2019, 09:33 AM
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Re: Check engine codes, emission monitoring, and revving issue

Some CELS keep tests being done, so fixing codes may get readiness done.
Search for your first 2 codes on here using subject only, couple threads that go over checks and fixes.

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post #8 of 10 Old 07-12-2019, 03:54 PM Thread Starter
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Re: Check engine codes, emission monitoring, and revving issue

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Originally Posted by aveenav View Post
which part did you replace? was it an OEM part?
sounds like MAF is bad or you have a leak near accordion hose that goes to throttle body.
It was the crankshaft position sensor that was replaced.
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post #9 of 10 Old 07-12-2019, 04:05 PM Thread Starter
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Re: Check engine codes, emission monitoring, and revving issue

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Originally Posted by dmdicks View Post
Are you the original owner of the car? What work has been done recently? How many miles on it? When was last timing belt change? Your not giving us much information to go on here.
I'm not the original owner; no work done on car recently and last time work was performed on it was to replace custom exhaust with an OEM exhaust, and crankshaft position sensor replacement that also fixed the revving issue, the work done on the car was at about 90k miles; 101.7k miles on it now; last timing belt change was done around 40-60k miles; do you need more information?
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post #10 of 10 Old 07-12-2019, 05:32 PM
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Re: Check engine codes, emission monitoring, and revving issue

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Originally Posted by mo1kd View Post
It was the crankshaft position sensor that was replaced.
Ok, that explains the fix for revving issue. Hope your mechanic installed an OEM part.

For your P0171 & P0174 codes
Next is to check for vacuum leaks and leaks around the accordion hose after MAF that goes to TB. Sometimes the hose develops cracks with heat and age.

If you don't find any leaks, proceed with cleaning your MAF using CRC MAF cleaner.
Using a scanner with real-time logging data, see MAF value on idle and 2500 rpm.
If MAF is defective, replace it with OEM part (made by Siemens or VDO). Costs around $100.

For your P0123
TPS could be faulty. OEM part shouldn't cost you more than $20.
Testing procedure: https://www.newtiburon.com/forums/hy...r-2003-gt.html
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Last edited by aveenav; 07-12-2019 at 05:42 PM.
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