Dead spot on the throttle [Archive]

86GTPONY

02-10-2010, 07:08 PM

Ok - on my 87 turbo coupe I have a dead spot on the throttle. When I rev it up, it goes from 1200 to 2000 rpm. I can't get it anywhere in between. I checked the throttle positioning sensor (tps) and the voltage increases as it's supposed to... So, I'm kinda stumped.

93cobra1928

02-10-2010, 07:38 PM

If you check resistance instead of voltage (with it disconnected) you will see the dead spot . Definately the TPS

EHardy1971

02-10-2010, 07:51 PM

If you check resistance instead of voltage (with it disconnected) you will see the dead spot . Definately the TPS
:agree:

86GTPONY

02-10-2010, 08:16 PM

Huh... never tried that before. Makes sense. I'll try that this weekend. Thanks!!!

SvoBrown

02-11-2010, 04:44 AM

I can't think of the name of it now but the Box before the turbo will cause this also. VAM. You can pop the top off of it and clean it with a scotch pad. The tps is much easier to check so start there first! I'm sure I have an extra one in the shop if you find a problem. A few years ago the VAM was $100 with a core at the zone.

jonosranger

02-11-2010, 06:15 AM

I can't think of the name of it now but the Box before the turbo will cause this also. VAM. You can pop the top off of it and clean it with a scotch pad. The tps is much easier to check so start there first! I'm sure I have an extra one in the shop if you find a problem. A few years ago the VAM was $100 with a core at the zone.

Vane Air Meter:jester: