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#1 Old 03-10-2009, 06:37 PM
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fannatick2
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Here goes, I have a í02 Hyundai accent 1.6L w/ 190,000 miles. Around Christmas one cold morning right after getting gas at a grimey service station my car started running like crap misfiring badly. Kicking and bucking it barely got me to work (6 miles). I took the car to an Advanced auto and had them plug it in to check the engine light. It was throwing multiple codes P0300 (Multiple Misfire Detected), P0301 (Cylinder 1 Misfire Detected), P0303 (Cylinder 3 Misfire Detected). I told the guy at advanced that I thought it was bad gas and he agreed, so I put some dry gas and Lucas oil gas treatment in it.
The problem seemed to get better within 50 miles, only misfiring when I drove it hard. I drove the car to NYC from Buffalo and back about 500 miles each way, each fill-up putting the dry gas and Lucas treatment in it along with premium gas. No problems the entire way.
The problem has come back and this time the gas treatments are not working. I am getting the same two codes along with a new code P0133, (HO2S-11 (Bank 1 Sensor 1) Slow Response) and the same symptoms, and to top it off my flex pipe has rusted out (for the second time).
So now I donít think the initial problem was water in the gas, and I am not sure what to make of it. The problem seems to happen more noticeably when I push the engine (first gear, and when accelerating) but then seems to get better when maintaining a constant speed. Also, the misfiring happens all the time but more noticeably when the engine gets to running temperature. First gear is by far the worst when the engine is warm.

The car got a tune (filter(s), plugs wires) up about 6mo ago
The timing belt is old about 90k on it
A new crank shaft position sensor a year ago
New O2 sensor (the 2nd one past flex pipe) 6mo ago
Burning about Ĺ to 1qt of oil (synthetic) every 3k miles but no smoke
The car has the original clutch w/ 191k on it!

This is where I stand. I donít care about the flex pipe or the timing belt. Unless I can defiantly pinpoint the problem to one of those two, the car has so many miles on it, to start dumping that kind of money into it doesnít make sense. I have put a spark test light on each of the plugs BUT the problem does not happen when the car is idle soÖit showed me nothing but properly functioning plugs. I was thinking the ignition coil (its original) but I think that would throw a code. Let me know what you think or where to start any advice would be helpful.
I love my car and I am very proud of it but I donít have the money to be a hero
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#2 Old 03-26-2009, 08:44 AM
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fannatick2
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So I changed out the coil pack and I still have the same misfire and the same codes. I have double checked the plugs and wires, and still nothing. I hate taking the car to the dealer for service but I am afraid I do not have a choice.
The problem remains,
Starts fine
Idles fine
Misfires when throttle is mote than half (rapid acceleration is not possible)
Misfire becomes more apparent when the engine is warm (even slightly warm) and always happens when I attempt to accelerate rapidly (any time, any speed, put the peddle more than 1/2 and it misses badly) the strangest thing is the car will still do 80mph but you need to slowly build up to that speed.
What should I do next?
Fuel pump?
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#3 Old 03-26-2009, 10:20 AM
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Sorry I did not read if you have replace the fuel filter?
if yes ... it could be the fuel pump..
another thing ... that bad gas can have make some damage to the cataliser...

Good luck.
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#4 Old 03-27-2009, 05:33 PM
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trishthedish
This is eerie.

I have a 2002 1.5L GS and it has the exact same codes when scanned. About 8 months ago, I had the O2 sensor changed and neglected to scan it afterwards, but it didn't give me any issues for about 3-4 months after that.
Just recently it's been misfiring like a mofo (it seems to be worse when it's damp outside) so I scanned it and the same 4 codes came up; I changed the plugs and they seemed corroded, which was weird considering they were only replaced 5 months ago.... and why the **** are they RUSTY?
I then re-scanned it, wherein the only codes that came up were misfire 1 and o2 sensor bank 1 sensor 1 (slow response). Which makes it even weirder.

So I'm glad I read this and found that you changed your coil pack without any great success, thus I won't waste my time and money changing mine (just yet anyway, not that desperate). I guess if you want a temp fix you can just throw in new plugs and wires.

I also lose about a litre of oil every couple of months (to god knows where, there's no spots and no smoke). Same for you?
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#5 Old 04-05-2009, 09:57 AM
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fannatick2
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I have given up on it! I am going to get a new fuel filter today and that is my last stand. I am doubtful this will make any difference; I just changed the filter four months ago. I am going to bring it to the dealer Monday If I have time and see what they have to say. The misfire had gotten much worse and I have run out of ideas. The dealers I have dealt with in the past have been F-ing thieves. Iím going to lay it on the line and go. The way I see it is, the car is not costing me $300 a month any more so if they can FIX it for $500 to $600 or so and it last me another summer its worth it. The thing that bothers me is that they can just keep telling you that it is one thing after another for $90 an hour and it they when they cant find whats wrong you have spent hundreds of dollars and still have a broken car.
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#6 Old 05-05-2009, 07:23 PM
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jasej
My '01 is doing the same thing, misfiring when accelerating. It completely died on me last week but after I changed the Crank position sensor it would start and get me back and forth to work but the misfireing came back (codes P0300 and P0301.) My fuel filter was changed about 2000 miles ago. Accent has 129k miles and everything else is original except for plugs and wires, they were replaced 30k miles ago.
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#7 Old 05-05-2009, 07:58 PM
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accent sport
QUOTE (jasej @ May 5 2009, 07:23 PM)
Quote:
My '01 is doing the same thing, misfiring when accelerating. It completely died on me last week but after I changed the Crank position sensor it would start and get me back and forth to work but the misfireing came back (codes P0300 and P0301.) My fuel filter was changed about 2000 miles ago. Accent has 129k miles and everything else is original except for plugs and wires, they were replaced 30k miles ago.
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#8 Old 05-05-2009, 08:06 PM
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accent sport
Are you guys absolutely sure the plugs are ok. I once had a saab turbo that was acting up just as you guys are discribing ,the car sat at idle just fine but when you went to accelerate the car would stubble really badly and buck . A long story short the car had a couple of defective plugs that only fail to operate once they were hot and under load.

Hope this insite helps.

Accent sport.
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#9 Old 07-23-2009, 03:29 PM
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vanceman
I have been dealing with the same thing. I have a 2000 Accent with 165K. It started with some random misfires several months back. I replaced all the plugs and wires and it ran well for a week or so. Then it said O2 slow to respond and so I replaced that. I used a universal and spliced it in to the original terminal. That lasted about a week before the CEL came back on with the same code. In frustration I took it to this Goodyear mechanic and of course he says it's the O2 sensor. I tell my story and he says I should use the OEM and return the universal cause splicing in could introduce enough resistance to cause it to run slow. I thought he was full of it but tried it anyway in desperation. I reset the code and drove 400mi straight out of state before the light came back on and now the car is misfiring again. It almost sounds like their is an exhaust leak- a very flabby sound when on the throttle. The new universal O2 sensor had looked a little burnt when I replaced it with the OEM too. I'm not sure if something is causing it to burn out or what. If someone could give me some suggestions I would really appreciate it.
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#10 Old 07-30-2009, 01:02 AM
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accent sport
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Have the injectors checked they maybe releasing to much fuel or damaged, if the car is running to rich that will cause the O2 to burn out prematurely as well as killing your cat converter. Is the exhaust odor very rich smelling like alot of fuel is coming out the tailpipe unburnt.


Hope This Helps You, Accent Sport
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