KV6 engine racing

SD1too · 19th June 2024, 17:14

Hi Stefan, it's good to hear from you. Here are the answers to your questions.

The throttle body is the original. Earlier in this thread I described how I have bought a new one only to find the fault still exists.

The throttle cable is the original. Yes, it is routed correctly; you know how meticulous I am about things like that!

The tickover does not return to normal with a quick slap down on the pedal. However, if the engine is stopped and immediately restarted, the idle will be normal. This is the most baffling thing of all and it appears to rule out the cable faults you have described.
When driving, the engine response to throttle inputs is faultless. It's only when the pedal is released that the car's deceleration is abnormally slow but I can see that the throttle linkage is definitely at the closed position. It's not being held open. Consequently I have not cleaned or lubricated the inner throttle cable and I haven't detected any drag on the cruise control actuator either.

You might have read that I'm rebuilding the top end of a friend's KV6 after the aftermarket water pump seized and caused the cambelt to shred. It's almost complete except for refitting the manifold chamber/throttle body and the owner is allowing me to fit that to my engine for testing purposes. I'm collecting it on Friday.

Thanks for your interest Stefan, much appreciated.

Simon

19th June 2024, 17:14	#11
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,668 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Hi Stefan, it's good to hear from you. Here are the answers to your questions. The throttle body is the original. Earlier in this thread I described how I have bought a new one only to find the fault still exists. The throttle cable is the original. Yes, it is routed correctly; you know how meticulous I am about things like that! The tickover does not return to normal with a quick slap down on the pedal. However, if the engine is stopped and immediately restarted, the idle will be normal. This is the most baffling thing of all and it appears to rule out the cable faults you have described. When driving, the engine response to throttle inputs is faultless. It's only when the pedal is released that the car's deceleration is abnormally slow but I can see that the throttle linkage is definitely at the closed position. It's not being held open. Consequently I have not cleaned or lubricated the inner throttle cable and I haven't detected any drag on the cruise control actuator either. You might have read that I'm rebuilding the top end of a friend's KV6 after the aftermarket water pump seized and caused the cambelt to shred. It's almost complete except for refitting the manifold chamber/throttle body and the owner is allowing me to fit that to my engine for testing purposes. I'm collecting it on Friday. Thanks for your interest Stefan, much appreciated. Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.