I have a dead spot at low rpm on my V6. Timing is at 10 degrees, fresh plugs, etc. When I get off the gas at low rpm and then get back on it the engine does not respond for a moment and then responds abruptly. I have read the TPS can get worn and cause this problem. Is there a way to test it or should I just replace it. Is a GM TPS still available?
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08:51 PM
PFF
System Bot
Apr 13th, 2013
CC Rider Member
Posts: 2037 From: Cameron Park, Ca Registered: May 2001
I believe they are still available. To test you need a meter or scan tool to read the voltage from idle to full throttle. An easy test would be if you have a buddy with another Fiero you could swap with.
They still make them. Unplug it and drive the car. It won't feel amazing but it will be better than before if it is the TPS because it won't be reading incorrect voltages from the TPS. If there is no difference with the abruptness of the throttle when you unplug it then it probably is not the TPS
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11:40 AM
Rick 88 Member
Posts: 3914 From: El Paso, TX. Registered: Aug 2001
They still make them. Unplug it and drive the car. It won't feel amazing but it will be better than before if it is the TPS because it won't be reading incorrect voltages from the TPS. If there is no difference with the abruptness of the throttle when you unplug it then it probably is not the TPS
Thanks for the tip! If there is no change, what should I look for next?
There's a good test procedure in the factory shop manuals for checking the sensor and the wiring. A bad TPS will usually set a code, even if it's intermittent, it will be stored in memory.
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07:17 PM
Apr 14th, 2013
cliffw Member
Posts: 37527 From: Bandera, Texas, USA Registered: Jun 2003
Originally posted by Rick 88: If there is no change, what should I look for next?
I am no expert but I am also having a problem with a dead spot. While at any cruising speed. It seems like a stumble, sort of like it is hunting for an idle rpm though obviously is is not an idle speed. I am wondering if it could be the IAC (idle air control) or a small leak in a vacuum line.
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09:21 AM
mark1970 Member
Posts: 170 From: Apopka, Fl USA Registered: Aug 2012
I changed my Map sensor already. I have Rodney's stainless vacuum lines. I have heard they can leak at the ends where the rubber tubing joins them because they are straight ends not bubbled. I don't hear any leaks, and I have sprayed the ends with no change in idle speed. I am going to test the EGR. Is there a test for the EGR solenoid? Mine appears to be original to the car.
