Bizarre problem for a 99 FX - Hyundai Performance Forums

RPIJG · 07-21-2004, 03:03 PM

Hello, well seems I come in here mostly for technical questions when the girlfriend calls me with rampant questions about why her car is broken. I tell her I don't know enough about her car to tell her anything, she gives me that "You-better-know-something-quick" look so here I am searching for the answer to her questions.

She was driving today when her car, suddenly slowed down and came to a stop (almost like she was applying the brakes, though she wasn't). Her account is as follows: After the car stopped she checked to see if it was making any sounds or leaking fluids or anything out of the ordinary. Nothing of the sort. The car was idling normally and nothing was leaking, nor was there any smells or abnormal sounds. She got back in the car, and pressed on the accelerator, and nothing happened, the car continued to idle normally, no studdering, yet no rise in the RPM's of the engine, either almost as though she hadn't pressed on the pedal. She then shut the car off, waited 2 minutes than restarted the car and everything was fine, the car then drove normally, she called me shortly after to have me answer her question. Does anyone here have any idea what might have caused this? Or better yet what is causing this?

tiburon_fx_pa · 07-21-2004, 06:22 PM

she was late coming to your house from her other boyfriends.. so she needed a good excuse...j/k X) that's definately a weird problem.. did she get a check engine light?????/

alz99 · 07-21-2004, 07:35 PM

i've heard of this before..
something with a sensor umm i'ma go and search

Edit* couldn't find what i was looking for.
check the Throttle position sensor wiring make sure its getting a good ground.

is the car an auto?

[Edited by alz99 on Jul 21, 2004 4:15 PM]

RPIJG · 07-22-2004, 12:06 PM

yes it's an atx, it didn't get a check engine light. Everything...seemed fine, it just didn't show any throttle response, as in ZERO. That's why I was thinking it had to be somewhere in that area, but I don't know what to look for there, the throttle cable is connected and looks good, there doesn't appear to be any mechanical issues, it moves freely as it should. Unless there is a sensor or electrical component there that would cause this, I can't see what could be wrong.

Cottonmouth · 07-22-2004, 02:06 PM

This is very strange. If you press the gas then the TB should open up regardless of fuel. There should be something very noticable when this is happening. I would think that the car should come to a stall or something close to it. Were you in the car with her when it happened?

RPIJG · 07-22-2004, 04:42 PM

I wasn't which makes me wonder if the throttle body just got stuck at idle. Cause the car was idling perfectly fine, I couldn't figure out why it wouldn't rev up when she pressed the pedal, still seems fairly odd to me, hopefully she'll let me know if it happens again, maybe I should drive her car for a bit to see if it can happen while I'm in the car.

Cottonmouth · 07-22-2004, 04:52 PM

Quote:

Originally posted by RPIJG
[body]
I wasn't which makes me wonder if the throttle body just got stuck at idle. Cause the car was idling perfectly fine, I couldn't figure out why it wouldn't rev up when she pressed the pedal, still seems fairly odd to me, hopefully she'll let me know if it happens again, maybe I should drive her car for a bit to see if it can happen while I'm in the car.
[/body]

That would be the best way to solve this. Not knocking your girlfriend but a lot of women will lose a wheel and describe it by saying "it drives funny".:lol:

alz99 · 07-22-2004, 05:27 PM

if the pedal dosn't respond (when it happens)
open the hood and use your hand to pull on the throttle lever/cable and see if it responds then. sounds like a bad ground from the TPS.

when it died when she was driving did it cut off fully (electrics etc) or was there just no throttle response and she needed to get off the road?

RPIJG · 07-23-2004, 02:32 PM

Quote:

Originally posted by alz99
[body]
if the pedal dosn't respond (when it happens)
open the hood and use your hand to pull on the throttle lever/cable and see if it responds then. sounds like a bad ground from the TPS.

when it died when she was driving did it cut off fully (electrics etc) or was there just no throttle response and she needed to get off the road?
[/body]

Just no throttle response. The car still idled correctly, and everything else was fine, I witnessed this last night, it is very strange. The throttle doesn't do anything. I got out, manually moved the TB open and whatnot, and there was no difference. It was as though the engine was indifferent to the accelerator controls. It idled fine, showed no CEL, and was otherwise normal. She shut it off, waited a minute then turned it on again, and it ran fine. This is certainly the most bizarre thing I've ever seen.

t4turbotib · 07-25-2004, 10:11 AM

if the car is completly stock with the stock air intake system check for blockage there might be somthing moving around causing a blockage just like if you closed the throttle body. if this is so the blockage would close off the air intake and the throttle body could be open or closed and it wouldnt change how much air is coming in the motor as the blockage woudl be determining this. however i belive that by opening the throttle there still should be some change in idle as the ecu should richen the mixture up when the throttle body opens? so when you shut the car off no airflow lets this blockage move and become un blocked alowing for normal operation. the other thing is possibley a lose cam on the throttle body so check that too.