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This happened to me yesterday, twice. While I was braking, as I understand the owners manual, the engine assists in braking by downshifting so the engine compression can assist in slowing down the vehicle. In both instances, the engine was under acceleration rather than deceleration-it was as if braking was causing the opposite to happen. I used to use this same method of deceleration manually with my 1990 Toyota 4x4, the V6 engine had enough compression to slow down the vehicle if I downshifted and let the engine slow itself down, which was an old trick I used with a 3-on-the-tree Dodge A-100 Compact Cab slant six. I never considered there would be new cars that had computer programming to accomplish this, and that's where I think any potenal problems are.
Now that I know about this issue, I'm hoping I can do some preventative maintanance that will possibly prevent this in the future. I have read many of the posts in here, and elsewhere I found that flashing the computer may reset the whole system. I'm trying to find out more about the procedure, it was performed by a dealer after a week of head-scratching, as an experiment and it seems to have worked for the owner who posted about it.
I love this SUV, it's a 2004 Santa Fe, not sure what model but it has traction control and ABS and it also may be awd.
Cracked IAC causing a vacuum leak. Brakes wouldn't hold it at a stop and in N,P would rev to 5000rpm.
After cooling down it would idle lower then after 15 seconds rise back up.
Do you think the replacement parts could be equally as risky? They are manufactured the same way/same place, specs. Your thoughts?
Huyndai could not fault it here, but it happend to the service tech when he shifted the car, unfortunatly this was while it was'nt plugged into the computer. $400 later nothing.
The throttle position sensor is easy to unplug, the car runs with it discconnected and it stil goes crazy. So its not the TPS in my case.
I see these reports in this forum are years old so im keen to know of any developments into the cause of this.
Im in New Zealand.
Thanks in advance, Patrick
This happened to me today.I drive a 2009 Santa Fe. It was terrifying and I could have gotten into an accident. I hit the gas to accelerate and merge onto the interstate and my car didn't stop accelerating. Got up to about 95 and had to zoom by people in traffic on the part of the road that’s not a lane and my brakes didn't work. My car shifted down once but then wouldn’t shift at all after and my gaslight came on even though I had a quarter of a tank 3 minutes before that, right before I left my house. My car started dying and slowing down and then eventually just died and wouldn’t turn on for like 5-10 minutes. There was hella traffic and I really thought I was going to hit someone or crash into a gutter or have to rear off the side of the road. I’m scared of my car and experienced the exact same thing today. Taking it in this afternoon to the shop- expecting the same response they gave you.