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I just purchased this car (09 Hyundai accent hatchback) that was involved in an accident, after we fixed everything and put things back together, my mechanic test drove the car and notice that the car drove nice for couple of minutes and then started to shake bad. He got back to the shop and used the scanner to find a problem with injector 1 (not sure what the code was). After further investigations, we found that injector one will missfire after couple of minutes of starting the car and if you shut the car down and restart the car (even if immidiately) the injector will work fine for another couple of minutes before doing the same thing again. This is the part that we don't understand, why would it work fine if you restart the car??? If there's a problem with the injector, sparkplug or wires or anything else, why would it diappear when re-starting??? Any advice is highly appreciated. By the way, even though the car has only 13k miles, I don't think there is any warranty on the car anymore because of the accident.
 

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Swap the injector with another one and see if the problem follows the injectoor or stays with the cylinder (could be an issue in the wiring harness) as for the reason it starts running bad could be a variety of thing ECU is getting bad signals from the injector and goes into limp mode could be heat related could be alot of things try and diagnose what the fault is by moving the injector might give you more idea where to go next...
 

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QUOTE (Jordan3 @ Sep 19 2010, 05:04 PM) index.php?act=findpost&pid=357290
By the way, even though the car has only 13k miles, I don't think there is any warranty on the car anymore because of the accident.
You absolutely have a warranty and please remember that your car does not just have A warranty, it has a warranty for each and every part. So even if you void the warranty on say your headlights by retrofitting them, you have not voided the warranty on anything else no matter what the morons at the dealerships will try to convince you of... so they can get out of dealing with warranty work that doesn't pay well and has a high chance of the customer returning multiple times and taking up shop time if they don't diagnose the problem properly.

Even if the injectors were part of the repair process from the accident, provided the shop you went to was a quality one, they should have a personal warranty to cover whatever work they did. Either way, this sounds like something you can most definitely try to get repaired under someone's warranty.

edit: oh, and if it does end up being damage related to the accident, this is something the insurance company that covered the bill should also be covering. If they can prove it so they don't have to cover it under warranty, that same proof will work for the insurance company who paid for the repairs to make an addition to your claim.
 

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QUOTE (berserko @ Sep 19 2010, 07:43 PM) index.php?act=findpost&pid=357303
Swap the injector with another one and see if the problem follows the injectoor or stays with the cylinder (could be an issue in the wiring harness) as for the reason it starts running bad could be a variety of thing ECU is getting bad signals from the injector and goes into limp mode could be heat related could be alot of things try and diagnose what the fault is by moving the injector might give you more idea where to go next...
If it doesn't follow the injector, try changing the coil pack. It sounds like it's something a coilpack would do.
 

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We did some testing today and we don't thing it's the injector or the coil pack that's causing this problem. We made the tests using a Noid light that will pulsate when connected to the wire that goes to the injector, this way you would know if the problem is there in the connections up to the injector or not. We found that the light will pulsate (connected to injector 1 wire) for less than a minute and then dies completely, when we restart the car (immediately, no waiting) the light start pulsating again and so on. I think that's a prove that there is nothing wrong with the injector or the coil pack or at least they're not the cause of this problem. That would also prove it's not an over heating problem because it will work right away upon restart NOR its a disconnection some where because it works for some time. So is the car in limp mode??? and if it is, what do I need to do??? At the same time I'm thinking that in limp mode, the car is stuck in 2nd gear and that's it so I doubt it is.....As for the warranty, after the accident, the title of the car says "not actual miles" and this is why I think there will be no warranty on it.
Thanks for all those who are try to help
 

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i think there was actually a ECM upgrade for a problem like that don't quote me on this because i work at a hyundai dealership and i think there was a 09 accent in there today with the same problem
 
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