Question about 2003 Hyundai Tiburon

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My 2003 Tiburon GT is having random misfires on cylinders 2,4,and 6. I have replaced the plugs and wires and it drove fine for about an hour. Started misfiring again on the way home for about five minutes, and stoped right before I arrived. I can not reproduce the problem to see if I am getting spark or not. The car has three coils, each one shares a cylinder on the oppisite side of the engine which is not having any problems. Fuel injector resistance is OK. Any Ideas?

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  • 777 Answers

Check you fuel pressure, If it's low, it cause cause your symptom. Have you checked your timing? Your belt may be skipping, if it's old it could be losing it's teeth, change it before it skips bad enough to cause you valves and pistons to crash into each other. Could be a bad cam / crank sensor also. Pull your codes and see what you OBD II is telling you.

Posted on Jun 09, 2017

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Posted on Jan 02, 2017

maklean
  • 1665 Answers

SOURCE: Misfire on cylinder 1 and 3

Do you observe abnormal idle speed? It may be just an indicator fault; not a really engine firing problem.
Sign up free at link http://ww.hmaservice.com/
You will find a lot of technical information for your model.

Posted on May 20, 2008

  • 14 Answers

SOURCE: my 2000 hyundai acc

Possibly coils check compression make sure the plugs are the proper ones some engines are particuler about the plugs

Posted on Mar 04, 2009

  • 1779 Answers

SOURCE: 04 Sedona 3.5 cyl #2 misfire replaced coil,back again 5 mos later

How many miles on the plugs and wires? Misfire can be caused by either plugs or wires, after that check the injector for that cylinder. Let me know what u find. Curt

Posted on Mar 11, 2009

  • 1 Answer

SOURCE: misfiring

my guess is the 3/5 coil there is a way to check individual coils but if you take it off and switch it with another one on the car then that will either eliminate it or correct it but other than that check wires make sure they arent laying on the exhaust, injector flow, when was the last tune up? how many miles on the car?

Posted on May 17, 2009

  • 159 Answers

SOURCE: Engine code giving misfire on 4 o 5 and P1521 oil contamination

check cam sensor,if the timing isn't adjusting with acceleration then you would have noticable power loss

Posted on Sep 27, 2009

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2003 sorento 3.5 cranks won't start code 300 302 304 306


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Hi, I have a 96 Jeep Cherokee with straight 6 cyclinder engine.The check engine lights on and Itook get to be put on a machine and the codes readed P0132,P0135,P0300,P0301,and P0420. Could you tell me


p132+ an O2 sensor reading is high bank1,sensor1, p135=O2 Heater circuit is bad, bank1,sensor1.

P300= Random misfires, p301 misfire cylinder1.p302 misfire cylinder2

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What this means is that the Bank1 O2 sensor is either bad or the wiring to it is defective. Check for heat burnthrough on wires. The misfires started randomly and now pinpoint to cylinders 1 and 2.

The Catalytic converter failing because the misfires are clogging it. This can self correct once the cylinders stop misfiring.

Which messed up first is where you start solving this. Replace the O2 sensor, it is fouled out on Bank1. The heater circuit(p135) just makes it work faster and has little effect once you are underway. But high resistence in the O2(p132) means it is coated and ineffective.

There is a problem with firing #1 and #2 sparkplug. Probably the cause for the Catalytic converter plugging. A cracked coil, plug wires, sparkplugs are some causes as well as dirty fuel injectors on those 2 cylinders.

It is a cause and effect situation where 1 part fails and damages another. You need to fix the source of the problem or you will repeat th damage.

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Have you verified that you have good fuel pressure/volume, good spark and that #2 cylinder is indeed missing? Sometimes a misfire code on one cylinder doesn't make that cylinder the culprit. Verify that #2 isn't firing by unplugging the injector while it its running and noting if there is any difference in RPM. Also use a spark tester in line with #2 between the wire and the plug to see if you are getting a good spark. Hope this helps, James Booth

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Because of the way it is set up with the coils, if one cylinder misfires it affects another one. Also, if a plug or plug wire is bad it will do the same thing. But it is possible that the head gasket is bad because you said it was low on coolant. That will also cause a misfire. Check plugs to see if any of them are wet.

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