wheeljo2

My dad is having an issue with his 1994 Corvette. Apparently, he says there is no throttle response at 1/4 throttle or less almost like a dead spot as it runs fine once you pass a certain threshold. Ran the codes and all is functioning properly as indicated by the C12 code registered.

I was thinking maybe torque converter but tranny guy drove it and said it feels more like fuel or ignition deficiency. He also said with traction control off and in 1st gear holding brake and mashing the gas it will not spin the rear tires.

Going to check the fuel pressure under a load next but wanted to post this thread first in case someone else may have encountered this situation before.

Thanks for your help and insight!

pcolt94

First thing I would check would be the TPS (throttle position sensor). You can either check it by resistance or voltage. If you check it with voltage, then you will have to measure the output on the wiper which should be the DK Blue (pin C) wire from the TPS. The voltage with the throttle closed should be about 0.6 volts. As the accelerator is pressed (key to ON position), the voltage should increase at a steady even rate with no jumps in the voltage. It should progress smoothly & steady from the 0.6 to 4.5 vdc (wot).

If you check it with resistance, it's best to unplug the connector from the TPS and then make the resistance measurements on the TPS varying the throttle and checking the resistance. Analog meters actually work better for this kind of test.

wheeljo2

Thanks PColt94, my dad swapped out the TPS sensor and that fixed his problem so thank you very much for your technical insight and expertise.

Cheers!

pcolt94

Outstanding. Glad you were able to resolve it so quickly.

Your making me look.

5abivt

My suggestion was to check the slack in the asr/throttle cables. But if it's fixed then

wheeljo2

Good call and that was my first suggestion been there done that before.