TPS question!
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Junior Member
Joined: Feb 2013
Posts: 87
Likes: 0
From: Michigan
Car: 1990 Camaro Iroc-z Z28,1987 Camaro
Engine: 406 Super rammed SBC, LT1 355
Transmission: 4l60E, 700R4
Axle/Gears: disc brake 3.27 9 bolt posi,10 bolt
TPS question!
Once my car gets up to operating temp when i change gears the idle drops and it wants to stall. could the tps be failing? the car is idlibng at 800 rpm's flat.any ideas would be greatly appreciated! thanks
Supreme Member
Joined: Apr 2010
Posts: 4,337
Likes: 29
From: Aurora, OR
Car: 87 IROC Z28
Engine: 355 cid TPI
Transmission: Custom Built 700R4 w/3,500 stall
Axle/Gears: QP fab 9" 3.70 Truetrac
Re: TPS question!
There are a number of things that could cause your symptoms. Since it's heat related, I think of things like injectors or ignition module, pick up coil, or ignition coil more than the TPS. The TPS is easy to test with a DVOM. You need a small piece of stiff wire like a paper clip to back probe the signal wire at the TPS connector. Make sure it reads about .5v(+/- .05v) with the throttle closed.
Joined: Nov 2007
Posts: 845
Likes: 4
From: Salt Lake
Car: 1989 IROC & ROLL-Z
Engine: L98 Vortec FIRST TPI
Transmission: T56, Mech Speedo
Axle/Gears: G92 J65 3.27
Re: TPS question!
Like ASE said, test that TPS.
Should be about .54V closed, sweep the throttle plate slowly open and make sure the voltage follows consistently. Should read 4.xxV wide open.
Might remove and clean that IACV motor with brake cleaner also.
Should be about .54V closed, sweep the throttle plate slowly open and make sure the voltage follows consistently. Should read 4.xxV wide open.
Might remove and clean that IACV motor with brake cleaner also.
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