2001 Hyundai Accent GLS 1.5L

Do you have a check engine light on in the dash? If so have it tested there will be a fault code.

Hi.

1. make sure you have the correct type spark plugs installed.
2. no vacuum leaks - lose air pipes
3. Check the Oxygen sensor "upstream" - remove it and see if it is sooted (black) then replace if needed.

hope this helps

I had a similar problem. It turned out that one of the spark plug wires was routed wrong, The maybe one of the problems

run fault codes and find the fault (electrical--- leads ---fuel pressure ---injectors. Have a compression test done to check valve sealing.

escape 2001 runs rough, but after a certain speed ( 50 mph ) runs smooth.

check Idle speed motor

Sure you can. Put a scanner on the diagnostic connector under the dash and check for codes. The codes you get ,do not tell you what is wrong or what to fix,but a starting point for the diagnostic steps you need to take, to find and repair the issues your having. Now --you need an understanding of your vehicles systems and possibly a wiring diagram, to reach a successful conclussion. That's where a professional shop comes in.

CHECK ENGINE light??? Whenever the 'CHECK ENGINE' (Service Engine Soon) light comes on, the ECU (Engine Control Unit) sets a Diagnostic Trouble Code (DTC). These codes identify the particular engine management system which caused the light to come on.
You'll need to use/find an OBDII (On-Board Diagnostic) Scanner to retrieve any code which have been stored in the ECU computer. Afterward, we might be able to help you DIAGNOSE the problem and perhaps eventually fix the problem.

1. There is NO SCREEN.
2. Did the 'Check Engine' Light come ON? Whenever the 'CHECK ENGINE' light comes on, the ECU (Engine Control Unit) sets a Diagnostic Trouble Code (DTC). These codes identify the particular engine management system which caused the light to come on.
You'll need to use/find an OBDII (On-Board Diagnostic) Scanner to retrieve any code which have been stored in the ECU computer. Afterward, we might be able to help you DIAGNOSE the problem and perhaps eventually fix the problem.

Step 1. Find a OBDII scanner (OBD stands for On-Borard-Diagnostics). Find out what DTC code (or codes) are stored in the ECU (DTC = Diagnostic Trouble Code, and ECU = Engine Control Unit - it's the computer which manages engine operation).
Step 2. After you find out which code is stored in the ECU, go to http://www.hmaservice.com/ and register your veh (by VIN). Afterward, you can navigate the Hyundai Service Site to find out what system is giving you problems, the diagnosis procedure and what may be needed to fix it.
Nuff said... Let me know what you find.