code 51/ quits when returning to idle

professorbob · 10-06-2011, 02:31 PM

1989 Turbo Targa with automatic transmission. After transmission rebuild and reinstall of engine and transmission, (See other post) the car ran great for 125 miles. Then suddendly at about 70mph started balking and dropped into limp home mode. Initial symptoms indicated possible bad fuel pump. Fuel pump replaced. and No joy....
The intake horn was cleaned during engine refresh of blow-by oil. Because the Turbo uses a Vortex generator, this UNIT SHOULD NEVER BE CLEANED as damage will occur. (Dealer price 700.00) Purchase a used replacement electronics on Ebay. Still not joy. This unit had the black sealer so it was not from a 1989 year car.
Found a local Supra owner who removed his good electronic meter and installed it. The performance improved by still not out of limp home mode. The new valve cover gaskets were leaking because the screw had worked loose. Tightening the gasket screws seems to help the problem. Have removed the Idle Air Control and Throttle Position Sensor for trouble shooting. Will now have to replace the large hose as it broke upon removal. Anyone have a source for pre formed hoses other than the dealer?
Are the IAC and TPS available as aftermarket parts?
All ideas and suggestions are welcome.

10-06-2011, 02:31 PM	#1
professorbob Intake Join Date: Nov 2007 Location: Lavonia Posts: 49	code 51/ quits when returning to idle 1989 Turbo Targa with automatic transmission. After transmission rebuild and reinstall of engine and transmission, (See other post) the car ran great for 125 miles. Then suddendly at about 70mph started balking and dropped into limp home mode. Initial symptoms indicated possible bad fuel pump. Fuel pump replaced. and No joy.... The intake horn was cleaned during engine refresh of blow-by oil. Because the Turbo uses a Vortex generator, this UNIT SHOULD NEVER BE CLEANED as damage will occur. (Dealer price 700.00) Purchase a used replacement electronics on Ebay. Still not joy. This unit had the black sealer so it was not from a 1989 year car. Found a local Supra owner who removed his good electronic meter and installed it. The performance improved by still not out of limp home mode. The new valve cover gaskets were leaking because the screw had worked loose. Tightening the gasket screws seems to help the problem. Have removed the Idle Air Control and Throttle Position Sensor for trouble shooting. Will now have to replace the large hose as it broke upon removal. Anyone have a source for pre formed hoses other than the dealer? Are the IAC and TPS available as aftermarket parts? All ideas and suggestions are welcome.

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