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I'm in the middle of the fun "TB removal and clean" job to try and fix my sticky throttle. Besides the sticky throttle issue I have also had uneven RPMs at idle and when driving with even pedal pressure. When checking my OBD2 scanner data the Throttle Position only reaches about 55% and idle is about 2% which made me wonder if my TP Sensor was faulty since I have read that idle should be about 10-12% but when I adjusted the cables to that my idle shot through the roof, so I adjusted it back.
Now I have access to the TB but before removing it and checking the TPS I had my dad floor the throttle while I checked it on the TB. I was able to push the throttle about 45 degrees more with my hands. The weird part is that when I let go and dad still had his foot on the pedal the throttle remained 100% open untill he released the pedal.
So something makes the cable not want to pull the throttle to 100% but it gets the strength to keep it at 100% after pushing the throttle by hand.
What I have noticed is that the end of the throttle cable is damaged and the traction controll unit plastic thingy is also cracked and "fixed" by a previous owner.
Do you have any experience with this type of fault and possible fix?
I’m pretty sure that you will already know this, having been in about the traction control / throttle relaxer, but there are two throttle cables. One before and one after the traction control unit. If they are both adjusted correctly, there could be a fault in the traction control, where there is effectively a clutch which transfers the input from the first cable which is connected to the drivers foot, into the output to the second cable which goes to the throttle body.
When wheel spin is detected, the clutch releases and allows the throttle to close despite the drivers foot still being on the pedal. It then reconnects and restores the throttle to the original position once the wheel has stopped spinning. If there is a fault in the traction control, you could get the symptoms you describe, although I have not previously heard of them.
XJR6, Throttle not opening fully?
