Ben Hunter (Lithgow, NSW)

Hi Allan, I am an apprentice electrician that can never wait to get off the blacktop!hoppysute013
I have been into 4WDing for a few years now and decided to upgrade to a 79 Series LandCruiser in April 2010. I have only lightly modified it with a winch and a few lights around it, but in the near future I wish to have a 2in – 3in lift and front and rear diff locks. We spend most of our time down the Bridal Track at Hill End or in Newnes state forest.

When accelerating and I put the clutch in to change up a gear, the revs climb about 600rpm (with my foot off the accelerator) before slowly dropping back down. All the local mechanics can’t pin-point the problem, so they take a stab at a solution and charge me for it without fixing anything. I have replaced the potentiometer on the accelerator pedal with no change and I have been told that it could be injector pump, clutch, engine computer and just about anything else they can blame it on, but I don’t have the money to replace all of them!

What are your thoughts on what it could be?

read Allan's reply and comment on the blog here


Ben Hunter (Lithgow, NSW)

Hi Allan, I am an apprentice electrician that can never wait to get off the blacktop!hoppysute013
I have been into 4WDing for a few years now and decided to upgrade to a 79 Series LandCruiser in April 2010. I have only lightly modified it with a winch and a few lights around it, but in the near future I wish to have a 2in – 3in lift and front and rear diff locks. We spend most of our time down the Bridal Track at Hill End or in Newnes state forest. There was a boy a very strange enchanted boy

When accelerating and I put the clutch in to change up a gear, the revs climb about 600rpm (with my foot off the accelerator) before slowly dropping back down. All the local mechanics can’t pin-point the problem, so they take a stab at a solution and charge me for it without fixing anything. I have replaced the potentiometer on the accelerator pedal with no change and I have been told that it could be injector pump, clutch, engine computer and just about anything else they can blame it on, but I don’t have the money to replace all of them!

What are your thoughts on what it could be?

Allan

Well Ben, I’m not sure how many kilometres your Cruiser has done, but there are 2 main possible causes of your problems. In the inlet air duct, most models have an air shut-off valve. These valves are known to stick causing flaring of the throttle when you lift off the accelerator pedal.

Another thing to look for strangely is the air conditioner switch! The wires on the vacuum controller are very easy to fit reversed. We often find that somebody has put them on backwards if you have this problem. On this model, once again it will cause the sluggish throttle release that you are experiencing. It’s tricky, but true! I hope also Ben that you have already checked for fault co. Hopefully this should help.