Toyota 4Runner Sudden Unintended Acceleration
smsgtretired Member Posts: 5
On May 5, 2010 our 2008 4Runner exhibited sudden unintended acceleration (SUA). Wife was at a stop, foot on brake, transmission in drive when the engine went wide open and the vehicle was out of control for about 800 feet. Toyota has it and is checking it out. I have been skeptical about these claims until it happened to us. This vehicle is not on their recall but may be very soon. Will post again when Toyota has run their tests.
And the addition of a brake override system, the very system that would have made your wife's situation very easy to get out of, requires an electronic throttle to be present in the first place.
I hope they get to the bottom of your problem, but the electronic throttle is sound from an overall standpoint.
I wish they had found something wrong with this vehicle to fix and cure the event experienced. Only good thing I have to report is no financial loss. The 4runner held its value so well that I saw no loss on the trade to a new vehicle.
Once your vehicle stampedes, you will never feel comfortable driving it again. As is evident, I have no brand loyalty. Sell me a product that does not work right and I dump it for good. No second chances with me. Been through GM, Ford, and now Toyota.
An independent, failsafe, brake override would simply open a circuit, spark, fuel pump, fuel injectors, if the brakes are applied and the engine doesn't quickly drop to idle.
Using the electronic throttle control, engine/transaxle control ECU, for override would be inappropriate since that is most likely to be the faulty component. And a retrofit, backfit, using the current engine control ECU, reprogramming, is reasonable approach for the EXISTING fleet. But for future systems it would be rather foolish to rely on the very same ECU firmware that may well be the causative factor. Best to use a completely independent brake override system/path.
Not full throttle but a rather serious level of engine PULL....
Good luck on that...!!
If this is something I decide to do (or not do) with my 4Runner, it will be because I received more authoritative information on the matter than what I might get from a Car Space forum.