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2004 Hyundai XG350 Question: engine Jerking at low rpm, flutters at about 25mph

 

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jarathehut, 3.5L V6, Camano Island, WA, March 14, 2013, 15:00
 Rookie

while at an idle, car surges fwd in a jerking manner. When you give it some gas the engine shakes and flutters for a few seconds untill about 25mph. After that, the car runs fine. Goes up hills no problem. You wouldn't know anything was wrong. Engine codes states miss fires on all aft cylinders. Previously, nothing was wrong with the car. I figured I'd better get some prevenative maintenance done so I took it to the local shop. Nothing was wrong with the car at this point. Local shop replaced the timing belt and all other serpentine belts, water pump, plugs and wires, radiator flush, tranny flush, valve cover gaskets, 3 coils and a few other regular tune up parts.
Now car will not idle right. All cylinders are at 150 psi. Fuel pressure is what it should be. Mech say's he doesn't know whats wrong with it and has spent to much time trying to diagnose the problem. So the shop gave me back my car. Could the cam shaft on bank #1 be out of time? Or perhaps maybe the idle sensor? Almost forgot, while at low rpms, like an idle, the oil light comes on. It goes away as soon as you give it some gas. Spent close to $2000 for prevenative maintenance and ended up with a car full of problems. Any ideas?

After they finished with it, the car ran but with a rough idle. They don't know how to fix it.

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  • Answer #1

    arturo08 March 15, 2013, 01:09
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     Master

    it may need to be reprogrammed.

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    jarathehut, March 15, 2013, 08:33
     Rookie

    Reprogrammed? Is this something I can do myself? Or would I have to take it into the Hyundai dealership

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    arturo08, March 15, 2013, 15:19
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     Master

    it is usually something reserved for performance upgrades. a chip install that will remove all limitting systems on the engine and reconfigure to maximize current engine conditions(airflow, back pressure, etc). it will stabilize combustion and hopefully increase power and fuel economy. it will also give you options for what type of performance you want(more power or more fuel economy). cost start at $200.00. if you are good with computers you can do this your self. autoanything.com has examples and reviews of these products: search engine programmers.

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    jarathehut, March 18, 2013, 14:51
     Rookie

    THANKS FOR THE INFO. I'LL CHECK INTO IT.
    TOOK THE CAR BACK TO MECHANIC. FOUND TIMING BELT WAS OFF ONE TOOTH. IN ORDER TO SAVE FACE, THE SHOP SAID MY TIMING BELT TENSIONER HAD GONE BAD AND THATS WHAT MADE THE BELT SKIP A TOOTH. THEY DIDN'T CHARGE ME FOR THE REWORK, ONLY FOR THE NEW TENSIONER. I HAD THE OLD ONE TESTED. NOTHING WRONG WITH IT....SO THE SHOP MESSED UP. THEY MADE IT RIGHT AND I'LL STILL USE THEM.

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    bosssauto, October 12, 2013, 21:22
     Rookie

    reprogramming easy turn key on depress peddle slowly to the floor let up turn key off every thing is controlled electronically

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