Question about 2002 Hyundai Santa Fe

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Engine will start,but will not idle and if you keep your foot on the gas pedal it back fires or pops in the intake manifold

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Out timeing

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1 Answer

WHAT WOULD MAKE MY CAR ENGINE WANT TO RACE FORWARD


A few possibilities:
  1. Defective throttle position sensor (TPS);
  2. Bad idle bypass circuit or idle circuit solenoid;
  3. Cracked intake manifold, throttle body assembly, or bad throttle body gasket (most likely);
  4. Serious vacuum leak somewhere.

Aug 02, 2014 | 2002 Buick LeSabre

1 Answer

Wont start


If you can keep giving it gas and it runs above idle with no problem, then you have a blocked or bad idle control valve on the throttle body assembly. With your foot off the gas pedal, the large throttle plate inside the throttle assembly is closed, but some air is let in through the idle control valve or motor through a separate passage. This can get clogged with deposits over time and poor idle results. The valve is controlled by the engine computer. It is how the computer controls idle speed- more air if the idle control valve is opened wider, higher idle speed.

"...like its not getting any gas..." Oh yeah, it's getting gas, the injectors are still pumping gas into the cylinders, but it may not be getting any air. All the accelerator pedal does is control the air supply into the engine through the throttle body. So modern cars have an air pedal, not a gas pedal. Then the computer takes over and matches the correct amount of gas through the injectors to the known supply of air in the intake manifold. Neat system, eh? Sorry if I sound so pedantic, dale. check your idle control valve.

Apr 20, 2014 | 1997 Mitsubishi Galant

1 Answer

My car wont stay running unless i keep my foot down on the gas pedal its a 1992 buick century station wagon


Most likely idle air control valve full of carbon and junk,it's kinda hard to get at to clean but if you take the air intake off and remove the silly screen in the intake manifold(gm said is was to correct
a driveability issue) Spray intake cleaner in the air horn ,engine off,try to clean off the throttle plate,you can see it ,get the back also,an old toothbrush helps if it's really bad.Open the throttle to get at the back.
Hopefully the excess runoff will take some of the same junk off of the IAC(idle air control)
It will start hard after this ,but it WILL help.

Jul 31, 2011 | Buick Century Cars & Trucks

1 Answer

Car will not start without pressing gas pedal to keep idle speed up. If I keep idle at 900 RPM or higher it runs as long as foot is on gas pedal. It then stalls out when I take foot off gas pedal. No...


Have the idle bypass valve checked, also called idle air control valve.
If that valve is stuck in the closed position, it's not allowing the fuel to bypass the throttle plate to keep it idling, resulting in stalling, but will keep engine running if the pedal is pushed down.

May 14, 2010 | 2000 Toyota Camry Solara

1 Answer

Idles rough quits when foot off gas pedal


You have a blown head gasket, or intake manifold gasket one of the two.

Feb 10, 2010 | 1996 Nissan Altima

2 Answers

2000 ford tarus wont idle v6


apply a light force to the gas pedal and start the car continuing to regulate the rpms with gas pedal if you can make the car idle with the gas pedal then you will probably need a new idle air control valve

Dec 10, 2009 | 2000 Ford Taurus

2 Answers

Will not idle


Idles so low it dies and you have to keep your foot on the gas or it runs fast and won't return to idle?

Sep 02, 2009 | 1988 Chevrolet Silverado 2500

1 Answer

95 jeep grand cherokee engine won't idle


check your air intake ducking for cracks....

the problem is probably there, wether you have a broken ducking or a cracked air intake gasket wich allows too much air in the intake manifold....

if the ducking and the gasket are good you might have a timing problem....

Apr 29, 2009 | 1995 Jeep Grand Cherokee

2 Answers

IDLE PROBLEM


Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Apr 14, 2009 | Chevrolet 1500 Cars & Trucks

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