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Discussion Starter #1
Hi all
Hey nice meeting all of you hope this can be helpful to both myself and others on here.

I have a 2002 sonata the car works well in reverse and idle well in P,N,R. when placed in drive sometimes it idle fine and sometimes it cuts off.
I’ve changed the transmission sensors both of them the throttle body.
I’ve changed the transmission oil.
The car sometimes pulls off fine and if the accelerator is racing goes well but at stop or low speed cuts off.
However if placed in neutral before stopping car idle fine.
Please help been putting a lot of money into this car and due to being parked the brakes need servicing now and also the engine cover gasket needs changing .
Someone said the valve body may need changing?
I appreciate your reply thank you.
 

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Clean the throttle body. Take it off and use spray carburetor cleaner. Make it all look like new.
 

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What kind of maintenance do you do on the vehicle??
Regular oil changes. Start engine everyday?
Replace spark plugs. Add fuel injector cleaner in gas tank?
Maybe time to listen to grcauto?? Clean the throttle body??
 

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Discussion Starter #4
Regular oil changes but did not start everyday in the last two years car started maybe 5 times.
I’ll try cleaning the throttle body as suggested.
But just as a side note the car starts without problem.
Thank you both. Further suggestions also appreciated
 

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Peter, your problem doesn't sound like a transmission issue to me. It sounds like maybe your problem is with the idle speed control actuator, since that is what controls the idle speed of the engine. The idle actuator is usually mounted on the throttle body, so while your cleaning it it might be a good idea to remove and clean the idle actuator and it's air ducts within the throttle body too.

If the the actuator is gummed up making it slow to react to commands from the engine PCM that could cause the engine to stall when you put the transmission into drive. Putting the transmission into drive adds load to the engine, slowing it down. The PCM reacts to the slowing of the engine by commanding the idle control actuator to open, allowing more air to bypass the throttle valve, increasing engine speed again. If the actuator can't react to the PCM commands the engine can slow down to the point where it can't continue to run, causing it to stall.
 

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Will try this weekend. How do I clean it ?
Brake cleaner or carb cleaner in a aerosol can
Spray at the IAC and/or throttle body
Wipe with rag or move linkages.
If throttle body or throttle plate then use a stick at the gas pedal to move
This avoids messing with the TPS sensor and re-learn modes
Wait, 2002? Never mind.
 
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