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Throttle Problems


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  • Member For: 21y 4m 5d
  • Gender: Male
  • Location: Sydney

I seem to remeber a thread some time ago about the throttle go to full all on its own, and putting a member into a gutter or something and the dealer couldn't find any faults.

I saw that JB in the ozemail car on Sunday had a simliar problem.

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  • Member For: 21y 6m 6d
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  • Location: Melbourne.

Can't be 100% sure but I don't think the Supercars use the "drive by wire" throttle system? Brad Jones seem to think it was a return spring that had failed. Maybe FPRMAN can shed some light on this?

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  • My new toy
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  • Member For: 21y 8m 22d
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  • Location: stanthorpe wine capital of qld.
Can't be 100% sure but I don't think the Supercars use the "drive by wire" throttle system? Brad Jones seem to think it was a return spring that had failed. Maybe FPRMAN can shed some light on this?

This is right they use a cable and eight butterflies and have a number of return springs if I remember from looking at a bo seton built motor.

I do not think the throttle on the turbo could go to full throttle with the safe gaurds that are built in to the system.

Ian

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  • Used to work at the Ford Proving Ground!
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the worst you will see a BA throttle do is hold about 2500rpm when the fault occurs to allow you to get off the road and out of the way! Found that out during testing! fun stuff!

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  • Member For: 22y 3m 3d
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harasn, sorry but I really can't understand how, if the throttle sensor on a BA develops a fault, it (the engine) can only do 2500 rpm.

To me, if a fault develops, then by definition it is a fault - not a partial fault, not a controlled fault, but simply a fault. And if there is a fault who can say with certainty just what that fault entails. It could be no throttle, full throttle or partial throttle or any combination of those things at different points in time. This is simply the way it is with electronics.

Mind you, I would reckon anyone would be in for a fairly hairy ride if the engine was allowed to run uncontrolled at 2500 rpm - 3rd or 4th in a manual and you'd have some fun trying to stop the car and find that safe spot out of the way eh? And an auto is potentially worse because the box will change down to lower gears as you try to brake and therefore keep increasing torque against you ... sure hope if this happens to anyone they have the premium brakes LOL.

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Guest Isher
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Most software based safety critical systems (like the accelerator in the BA) would be designed to have a "Fail-Safe" system. That is they would be monitored and in the event of abnormal behavior revert to a pre-determined safe condition.

Could be that Ford have decided that the "Fail-Safe" for the accelerator would be to run the engine at 2500 rpm. :sick:

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  • Bloody Orange Team (BOT)
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  • Member For: 21y 6m 22d
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In my former vehicle, a 1998 Pulsar SSS I once picked it up after a service. Decided to put the pedal to the metal so to speak and the throttle stayed open. Almost ended up slamming into the back of a car, but luckily I was able to quickly switch off the motor and coast to the side of the road. When I called the dealer, one of the mechanics came and he certainly had a hard time getting the fully open throttle to release. It eventually released and I had to wait 10 days for them to get a new throttle body from Japan. Stuck throttles are not a nice thing to experience, that's for sure.

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  • My new toy
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  • Member For: 21y 8m 22d
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Most software based safety critical systems (like the accelerator in the BA) would be designed to have a "Fail-Safe" system. That is they would be monitored and in the event of abnormal behavior revert to a pre-determined safe condition.

Could be that Ford have decided that the "Fail-Safe" for the accelerator would be to run the engine at 2500 rpm. :sick:

This sounds right as it would ave fail safe system built in

Ian

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Guest Talon
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Mine has the throttle fault light coming on at light acceleration at the moment.

Took it to the dealer 3 weeks ago and am still awaiting a part (1 day to fit?)

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  • Member For: 21y 7m 14d
  • Location: On the edge
Most software based safety critical systems (like the accelerator in the BA) would be designed to have a "Fail-Safe" system. That is they would be monitored and in the event of abnormal behavior revert to a pre-determined safe condition.

Could be that Ford have decided that the "Fail-Safe" for the accelerator would be to run the engine at 2500 rpm. :blink:

There are 2 different levels of failure mode depending on the failure and the level of control the PCM has over the throttle body(ETB)

1/ Default position:- this occurs when no reliable information about drivers request is recieved such as a disconnected APPS(accelerator pedal position sensor/switch) or loss of internal PCM control. In this case the PCM de-energises the ETB and allows the spring-loaded throttle plate to default to a slightly open position (7 deg plate angle) allowing limited operation. The PCM may also selectively cut fuel and/or spark to maintain control of rpm and maximum power.

2/ Total Shutdown:- should the PCM be not able to control the system correctly as in one of the above modes or have an internal fault then the engine will shut down rapidly, this may best be described as just like running out of fuel.

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