Guest ShlbyTurbo Posted March 17, 2002 Report Share Posted March 17, 2002 My 1990 turbo laser doesn't like to idle at a steady rpm. usually revs high when i press the clutch for about 20 or so seconds, then drops to normal. Also has erratic idle upon start-up. any ideas? Quote Link to comment Share on other sites More sharing options...
Guest 614Streets Posted March 17, 2002 Report Share Posted March 17, 2002 ShlbyTurbo you most likely have a vacuum leak. The idle problem will be more pronounced on colder days as you probably know. The reason it gets better after it warms up is simply due to expansion. On higher milage engines weak valve springs , worn valve seats , cracked rubber lines , and leaky intake gaskets, as well as cylinder pressures that vary from cylinder to cylinder contribute to idle charecteristics. Brake Boosters commonly leak after 10 years as well. Quote Link to comment Share on other sites More sharing options...
SamZman Posted March 18, 2002 Report Share Posted March 18, 2002 yeah most likely vacuum. A good way to check this is to take a can of starter fluid and spray on possible vacuum problem areas. Quote Link to comment Share on other sites More sharing options...
Lustalbert Posted March 26, 2002 Report Share Posted March 26, 2002 for safetys sake, dont spray starter fluid with an open flame of while smoking, otherwise bigger problems will arrise...... (not from my own experiance, but i have a friend that had no eyebrows for about a month) Quote Link to comment Share on other sites More sharing options...
20G TSi Posted March 26, 2002 Report Share Posted March 26, 2002 Originally posted by ShlbyTurbo: My 1990 turbo laser doesn't like to idle at a steady rpm. usually revs high when i press the clutch for about 20 or so seconds, then drops to normal. Also has erratic idle upon start-up. any ideas?sounds like your base idle set screw has come loose and backed out a bit. There is a big hole in the throttle body with a screw inside of it that controls idle speed. I would adjust this screw (with the car running) and see if that helps. Sometimes the screw can back itself all the way out of the hole (thanks to boost) and be missing, so if you see the hole, but there's no screw, you need a BISS (base idle set screw). Another thing (hope its not, they're expensive) it could be the IACV (idle air control valve) stuck open. Quote Link to comment Share on other sites More sharing options...
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