Replaced 0xygen sensor in 2003 Hyundai Accent 3 Times Not Fixed!

2002 hyundai accent , gas or Diesel NO VIN posted.
no engine told at all and is a pure engine quesiton.
no vin told or country. (so books on it can be read)
the misfire can be lots things.
why not scan the PCM first and see P03xx errors. or more.
the gen2 model came new with one of these,nobody can guess.
the engine is MISFIRING, sure power loss, sure.
the first question is do all 4 cylinders misfire or just 1 or 2
facts and test matter on all engine diagnosis, guessing fails. hard.
if that oil leak did not leak in to COP spark wells the leak is a SIDE SHOW to nowhere. oK, no COPS on a DIESEL.
misfire is engine bad, spark bad,and fueling bad. in that roder
if all fail, the cam belt slipped at 100k miles. on 1.6L ,no me looking them all up now. no engine told

• Cam belt ignored for 20 years, no way !
• VVT bad.
• heat gasket blown.
• valves burnt in head.
• spark plugs or cops boots or all 8 parts
• valves ping broke(head)
• coolant leaks to combustion chambers for the bad act of using only water for AF antifreeze 50% correct.
• these are not gessing those are legit failure mode, 20 or more possible inside the engine or attached.
• injectrors bad or clogged.partly or leaking
• fuel pressure 2 time normal and FPR stuck closed and bad.
• or stuck one and too low fuel pressure. or fuel pump bad.
• I can to more, but this list shows why we do tests and not guess. buy the tools or get the car fixed by shops with tools

engine compression way low x4. <150psi , cam belt slipped.
spark tested bad, any and all Hyundai engines are interference..
that means if cam is belt driven and ignored, it can bend valves
easy as pistons hit(crash-into) head valves.$$$$$$$$$$$$$$$$


SORRY NO CAN GUESS ENGINES> no can do;.
1999 - 2005, gen2.
Gas (petrol)
1.3 L 12-valve SOHC Alpha I4, 82 hp (61 kW) from 2000-2003, 86 hp (64 kW) from 2003-2005 (except cars with Air conditioning, rated at 82 hp).
1.5 L 12-valve SOHC Alpha I4, 92 hp (69 kW) @5500 rpm and 97 lb?ft (132 N?m) @2900 rpm, 0-100 km/h: 12.0 sec., top speed: 181 km/h (112 mph)

1.5 L 16-valve DOHC Alpha I4, 102 hp (76 kW) and 98 lb?ft (133 N?m)
0-100 km/h: 11.6 sec., top speed: 185 km/h (115 mph)

1.6 L 16-valve DOHC Alpha I4, 106 hp (79 kW) and 106 lb?ft (144 N?m) 0-100 km/h: 10.9 sec., top speed: 189 km/h (117 mph)
1.6L is belted cam !


DIESEL
1.5 L CRDi (R 315) I3, 82 hp (61 kW) and 137 lb?ft (186 N?m)
0-100 km/h: 14.0 sec., top speed: 170 km/h (106 mph)

Some links which may help
https://www.hyundaiforum.com/forum/hyundai-accent-16/2000-accent-1-5-stalls-when-warm-wont-start-until-cooled-off-11447/
Some possible things to look at.
https://www.cargurus.com/Cars/Discussion-t6479_ds497573
Do you have a check engine lite if you do what is the code.
Where I live most auto parts store will check you code for you for free.
https://www.hyundai-forums.com/lc-2000-2005-accent/217401-accent-shuts-off-when-idling-warm.html

How to change spark plugs hyundai accent 01 - 05 - YouTube

? 3:18
https://www.youtube.com/watch?v=tU2vwisJ7v4
Feb 16, 2012 - Uploaded by PNBNC
I filmed this right after changing my old plugs, I figured it was easy enough to film and some people can profit from it. for a ... Coil, you mean wire lol ... When you go to put the spark plug back in, never start it with the ratchet.

How To Replace Change Install Spark Plugs 2001-06 ...

? 3:17
https://www.youtube.com/watch?v=yVV2KcPDFIo
May 14, 2013 - Uploaded by 1A Auto Parts
... spark plugs. This video is applicable to the 2001, 2002, 2... ...spark plugs. This video is applicable to the 2001, 2002, 2003, 2004, 2005, 2006 Hyundai Elantra 2.0L. ... +queentonks A little know-how can go a long way. We're glad ... When do you think is good to replace my spark plugs wires? My spark ...
2001 Hyundai Accent Firing Order: Engine Mechanical ...www.2carpros.com/.../hyundai-accent-2001-hyundai-accent-firing-orderApr 23, 2009 - Engine Mechanical problem 2001 Hyundai Accent 4 cyl Two Wheel Drive Manual 95000 ... Now I'm trying to figure out how they go back on. How do I find out the Engine Firing Order for my car - Hyundai Accent 2001 1.5L?Which is cylinder 1 - 1.6 Accent - Hyundai Forum: Hyundai ...www.hyundaiperformance.com/.../16837-cylinder-1-1-6-accent.htmlJan 13, 2003 - 3 posts - ‎3 authorsFrom what I read though, the coil pack is configured as 1 4 2 3. I'm assuming the first wire on the coil pack goes to cylinder 1. Can anyone ...

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

incorrect spark gaps will cause a coil pack to burn out.

Vehicles Covered: Hyundai Sonata 2002-2004 (2.4L & 2.7L Engines)

In 2003, Hyundai produced two types of Sonata:
Available engines:
4 Cylinders 2.4L VIN "S", MFI DOHC - see Figures 1 and 3.
6 Cylinders 2.7L VIN "H", MFI DOHC - see Figures 2 and 3.

To differentiate between these types of 2003 Hyundai Sonatas, the VIN 8th digit (Engine Type) will either be "S" or "H" as in the table above.

To locate the Engine drive belt, jack up the vehicle & place it onto jack stands, then slide under the car (toss a cardboard mat down first), then, once under the car, remove the (plastic) engine splash shield. Once removed, the drive & accessory belts are easily observed.



Fig. 1 Accessory Drive Belt Routing 2.4L (4 cyl) Engine - Hyundai Sonata
The "COMPRESSOR" refers to the A/C compressor, and "GENERATOR" refers to the Alternator.




Fig. 2 Accessory Drive Belt Routing 2.7L (6 cyl) Engine - Hyundai Sonata
The Belt Routing on the Left is "With A/C", on the Right is "without A/C"

Inspection - Drivebelt and Accessory Belts

Inspect the drive belt for signs of glazing or cracking. A glazed belt will be perfectly smooth from slippage, while a good belt will have a slight texture of fabric visible. Cracks will usually start at the inner edge of the belt and run outward. Worn or damaged drive belts should be replaced.

Drivebelt Removal & Installation - 2003 Sonata (2.4L and 2.7L engines)

Raise and support the vehicle.
Remove the engine splash shield.
Rotate the drive belt tensioner clockwise to release the drive belt tension.
Remove the drive belt from the alternator.
Slowly release the drive belt tensioner.
Remove the drive belt from the accessory drive pulleys.

To install:

Install the drive belt to the accessory drive pulley.
Rotate the drive belt tensioner clockwise.
Install the drive belt to the alternator.
Ensure the drive belt is properly aligned and seated into the grooves of the accessory drive pulleys.
Slowly release the drive belt tensioner
Install the engine splash shield.
Lower the vehicle.

Here's the best illustration I can find of the Hyundai 2.4L and 2.7L engines - the drivebelt seems to be located on the passenger side of both of these transversely mounted engines.



Fig. 3 Hyundai 2.4L and 2.7L engines - Underhood sensor locations 2002-2004 only

Glossary of Acronyms
---------------------------------
A/C - Air Conditioning
DOHC - Dual Overhead Cam
MFI - Multi-port Fuel Injection

P0301 - Cylinder 1 Misfire Detected.

Possible Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak at cylinder

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

Being you have a heavy gas smell I would look into the injectors. If injector #1 is over producing it can cause a misfire. Test your compression and fuel pressure.

It;s a 1.6 DOHC, here is a link for more info on your engine specs:
http://consumerguideauto.howstuffworks.com/2003-hyundai-accent-13.htm
Good luck!!

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 and perhaps eventually fix the problem.

I have seen coil packs go bad on several Hyundai Accents, the coils will do exactly what they are supposed to (hence your check with an ohm meter), however, the coils short through the outer casing. Try running the car when it is dark out and spraying the coil packs with water. Listen for clicking and watch for arching from the coils to any metal around them. Look for abnormal detonation marks in the outer casing. My guess is you just need a set of new coils. If the Problem is worse in the rain then you have found your problem. Remember, If your car has been misfiring (as noted by the engine codes you listed), the EGR valve can become clogged and damage can be done to your catalytic converter as unburned fuel detonates inside it (keep an eye out for O2 codes in the future). Also, your new plugs can become fouled, be sure they are clean once you fix the problem. Checking your plugs can also be a useful indication of which cylinder is misbehaving.