LTX and LSXPutting LT1's, LS1's, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects, including repairs, swap info, and performance upgrades.
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I have a 1995 LT1 from a Caprice in a 3rd gen firebird. I had an issue with random stuttering from the engine awhile back and when I hooked up a laptop to watch the ODBII stream, I saw that the CTS kept dropping to -40F randomly and causing these stutters. I changed the CTS and it worked good for a couple of days, then developed the same issue. I changed it again and it lasted for a few weeks and then developed the same issue.
Has anyone heard of this happening before or do I have a unique problem? I'm considering just hooking a switch for HOT/COLD which will output the proper voltage/resistance based on the conditions... Or I guess it could be the ECU's problem of interpreting the signal.
Anyone suggest a good way to check for that? It's intermittent which makes it difficult. I suppose I could hook a voltmeter/ohm-meter in parallel with the sensor and watch that, but would the ECU's connection affect the readings?
I thought of that too but it worked fine for months after the initial swap... Then I ran into these problems. I guess I could run my own loom directly from the appropriate pins on the ECU to test the theory.
Just thought I would put it out there in case it's something other people have seen before. Anyone else have any thoughts?
This thread is pretty old but just wanted to update it, The car sat for a number of months and I've been getting back into it lately, and had the same problem appear. It turned out to be a bad pigtail. I snipped the CTS connector and replaced it with one from another harness and viola it seems to be working well and consistantly now.
Electrical gremlins are my favorite haha. The freescan utility was indispensable at helping me diagnose it... It was clear when I saw the engine temp kept dropping to -40f and then one second later jump back to 170 or wherever it was... It was a good learning experience too. Now I know firsthand what the symptoms of an erratic/bad connection to the CTS can cause and if I ever see similar symptoms again on a car, even one without an ODBII data stream that I can read, you can bet I will eye up the CTS connector and sensor!
