Question about 1999 Hyundai Sonata

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Low power check engine light is on, when the gas pedal is depressed mid way the engine dies down until the pedal is pressed further the car accelorates violently

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First thing to do is get the computer scanned for trouble codes. The codes will point you to what needs to be tested.
Chances are its the throttle position sensor, but it could be several other things.

Posted on Jan 16, 2013


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Posted on Jan 02, 2017

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SOURCE: Just had a gas refill, no acceleration ck eng light

change fuel filter. If you have someone local, have them run a fuel sytem clean out on your car. Then add a can of Seafoam to your fuel. It is all about the ethanol goop problem that are causing all the problems on these cars. it fills the system up with water, and turns to gas into a brown syrup. but every 3000 miles(after this). if you add Seafoam to your car, it will keep the lines clean, break up the goop, and your car will not have line freeze up this winter. good luck

Posted on Aug 28, 2009

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SOURCE: 1998 hynudai elantra won't start. Need Help.

well it could be as simple as just replacing the fuel pump relay. it's located in the junction box under the hood. if the relay is good then check the fuel cutoff switch. that is located behinfd the fabric in the trunk along the wheel wells. if this was not triggered then it could be that you might have a glitch in the ecm water is not kind to computers especially cars that have the ecm's in the engine compartments

Posted on Oct 05, 2008

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SOURCE: my buddy has a 2000

Have you checked the MAF and/or TPS sensor?. I have had the same issue before on the same kind of car and it turned out to be the MAF sensor.

Posted on Nov 07, 2008

  • 1 Answer

SOURCE: 2000 Hyundai accent acts as if it is starving for

We've have the same problem with ours. We found the fuel canister needed replaces. It's mounted near the back bumper with straps. The part cost us about 125 bucks and was pretty easy to replace. The trick is to get the bolts out without snapping them.

Posted on Jul 13, 2009

  • 1280 Answers

SOURCE: 2005 Huyandai Santa Fe chugs when idle and while

Whenever the 'CHECK ENGINE' (Service Engine Soon) 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 the problem and perhaps eventually fix the problem.

Posted on Oct 04, 2009

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I have a 2004 grand prix,sputters at 2000 rpm no engine light.w/ car off key on, press gas 5 times get codes 1125,2125. clear codes light goes out but still sputters. do i change accelerator and TPS?

.The control module provides the APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensor then provides the control module a signal voltage proportional to pedal movement. The APP sensor 2 signal voltage is low at rest and increases as the pedal is depressed. When the control module detects that the APP sensor 2 signal or the APP sensor 5-volt reference voltage is outside the predetermined range, DTC P2125 sets.

The control module provides the APP sensors a 5-volt reference circuit and a low reference circuit. The APP sensors then provide the control module signal voltages proportional to pedal movement. The APP sensor 1 signal voltage is low at rest and increases as the pedal is depressed. The APP sensor 2 signal voltage is also low at rest and increases as the pedal is depressed. One APP sensor DTC will not cause the Reduced Engine Power message to be displayed. Two APP sensor DTCs for the same sensor also will not cause the Reduced Engine Power message to be displayed. However, if two or more DTCs are set involving more than one APP sensor, DTC P1125 will set.

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Hi Christopher:
I'd be checking to make sure that the grounds are nice and clean and working properly. When you step on the brake pedal you are activating a switch that sends power to the brake lights. The brake lights share bulbs with the signals and emergency flashers, so it is also possible that a dead short in any of those components could "steal" the power from the ignition.
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Have the TPS (Throttle Position Switch) checked with a milli-volt meter, it seems like it is not working properly or is dead. if it is not working it won't send a signal to the ECM (Computer) to let it know how much the accelerator pedal is being depressed so it cannot know how much give fuel and air to give the engine. Also have the MAF (Mass Air Flow) sensor checked.

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I'am gussing that there is two differant trucks here. Well on the first truck with a problem, you say its not a fuel problem, Ok i would be checking the E.G.R. valve, when that gets pluged up it will act like that, it gets carbon build up and won't function, and won't idel and stall. Take off clean it up put back on with a screen gasget, they will know what your talking about at the auto parts store. Truck #2 you can get a pump at any auto parts store they all will be around same price. But do the same as i told truck #1 egr valve is over looked alot it just might solve your problem. if anything up your M.P.G. Both do a fuel pressure test, if that chk. out ok, at least you can elimanate that as a potential problem.

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