C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

1984 TPS test?

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Old Aug 7, 2012 | 02:03 PM
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Billwrin
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Default 1984 TPS test?

So, I've had a terrible time getting my Crossfire to start. I've changed and tested everything that's been recommended to me or have found in books. I limped it home almost 3 weeks ago and it hasn't started yet.

So, today while pouring over my parts store Chilton book again I decided to test the TPS(just about the only thing left original on the car(startabily circuit)).

I followed the instructions in the book and got 4+ volts at idle position and it dropped gradually and smoothly down to just under 1 volt at WOT. This is opposite to what the book says it's supposed to do. The book says .5 volt at idle and 5 volts at WOT.

Did I find the problem or do I have a backwords system?

With gratitude,

Bill
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Old Aug 7, 2012 | 03:04 PM
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I redid the test. I got better numbers this time but I still think it's a bad part. Probably not bad enough to cause the no start problem.

I got .6vdc or so at idle position and about 3vcd at WOT.
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Old Aug 7, 2012 | 05:44 PM
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Install a new throttle position sensor. Your part is 28 years old and is most likely a DEAD soldier.

http://www.ecklerscorvette.com/corve...1982-1984.html
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Old Aug 10, 2012 | 08:13 AM
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I ended up taking my car to a mechanic. He was able to figure it out pretty quickly. It was the pick up coil. What I've learned from this whole ordeal is to trust your gut. I had one in my hand at a parts store a week or more ago and was ready to buy it but the guy behind the counter said "those never go bad, look for this instead". The part he pointed me to was not bad but it cost me another $50 and the time it took to track one down and change it.

So, the advise "it's 28 years old go ahead and change it" has cost me a lot of time and money. The best advice I've found in these forums was something to the effect of "figure out what's wrong before you go changing parts." Another great piece of advice was "get the factory shop manual to help you figure it out."

I'm not writing this just as a reply to a previous message but more importantly as advice to future readers. That way they won't be steered down the costly path that I took to get my car fixed. From now on I'll only take the advise that tells me how to figure something out, which there is plenty here, and never "just replace it" advice.
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