Traci Posted June 12, 2004 Report Share Posted June 12, 2004 I just pulled error code P027 (Open Throttle Signal Switch) off of my 1994 STS. When I first start her up the idle screams up to 3000rpm then comes down to arround 2000rpm until I hit the brake and it will then come down to 1000rpm, but is more of a surging idle than a steady idle like it used to be. How can I fix this/get rid of the error message? Thanks, Craig Link to comment Share on other sites More sharing options...
adallak Posted June 13, 2004 Report Share Posted June 13, 2004 switch maybe diconnecte (check it out) if not just replace the switch and everything will be back to normal The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
adallak Posted June 13, 2004 Report Share Posted June 13, 2004 I would also open the hood and look at idle speed motor (does it move greely) and throttle body for possible deposits preventing accurate response of the thottle The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
Traci Posted June 13, 2004 Author Report Share Posted June 13, 2004 Unfortunately, I do not have a repair manual. Can someone tell me where this switch is located/what it looks like? Also, I would imagine fixing this problem will get rid of the "check engine soon" light which came on at the same time the problem occurred? Thanks again, Craig Link to comment Share on other sites More sharing options...
adallak Posted June 14, 2004 Report Share Posted June 14, 2004 Unfortunately my car has 4.9 l motr. I am sure some peoplr with Northstar will give better direcions. The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
wontgoslo Posted June 14, 2004 Report Share Posted June 14, 2004 it may just need a little throttlebody cleaning.that black gummy crud really builds up over time.causing the throttle to stay open slightly.carb cleaner or throttlebody cleaner works Link to comment Share on other sites More sharing options...
adallak Posted June 14, 2004 Report Share Posted June 14, 2004 can you access the throttle body and see whether it clean and blades move freely when you chenge RPM? TPS (Trottle Position Sensot is attached to the back of the throttle body. It has just one connector. Make sure it is in place or take it off and put it back. The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
CaddyShack24 Posted June 14, 2004 Report Share Posted June 14, 2004 Just wanted to say that the "Throttle Switch" and the "Throttle Sensor" are two different things.. the Throttle switch is part of the Idle Speed Control motor and it tells the PCM to control the idle when its closed.. sounds like yours is acting up, you'll have to replace the Idle Speed Control motor most likly ($120 us) It should be mounted to the side of the Throttle body.. you'll see the accelorator cable nearby and a little motor with a plunger that presses the thottle blades open.. thats what ya want to replace, could always buy one and match it that way too Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.