Here’s the latest reader question, along with my reply!
Jay asks: I have a Nissan pickup that does a weird thing. The engine revs on its own. This happens intermittently. The engine will run up to around 2,00 RPM and then back down to its normal idle speed and then back again for awhile. It usually stops after a few minutes of this. By the way the truck has a manual transmission. What do you think could be causing this?
My reply: Lucky for you I have a Nissan pick-up, too – and the same thing happened to mine. Check the idle air controller. It’s probably faulty. As an aside, in the Olde Days, some GM vehicles with carbs had a mechanical device that kinda-sorta served the same purpose. A little plunger would shoot out to increase the engine idle speed by pushing on the throttle arm when the AC was turned on. Sometimes, these things stuck – and the idle would run high for that reason. It could be fixed with a screwdriver, too. Just remove the little plunger thing and screw in/out the idle speed screw to obtain the idle you liked.
In modern EFI cars, you get the idle the computer likes.
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