Strange running habits, need help.

[PlayingWithTBI]

engine coolant temperature, located next to thermostat housing

AKA CTS (Coolant Temp Sensor) I think GM called it that in the older TBIs

 

[PlayingWithTBI]

Anyway, you need to put a scanner on it and see what's happening when it does that before you waste any more money on needless parts.

 

[Redneckgeriatric]

AKA CTS (Coolant Temp Sensor) I think GM called it that in the older TBIs

yes, and always some confusion as to which it is and its location. one feeds ecm, one feeds temp gauge/light. the autozone guy will almost always bring you the wrong one, and you tell him its the other one. lol

 

[Redneckgeriatric]

Anyway, you need to put a scanner on it and see what's happening when it does that before you waste any more money on needless parts.

not to be confused with code reader.

 

[PlayingWithTBI]

Yeah, it's the 2 wire one that feeds the ECM and the 1 wire one feeds your gauge.

 

[Redneckgeriatric]

after reading update , sure sounds like cat clogged, or muffler. easy test for that is vacuum gauge. but again, mr TBI says it best when he says use a scanner, it too will show vacuum issues and other parameters.

 

[24 Karat Brown]

after reading update , sure sounds like cat clogged, or muffler. easy test for that is vacuum gauge. but again, mr TBI says it best when he says use a scanner, it too will show vacuum issues and other parameters.

I do have my original cat and y-pipe, so that could be that. I have noticed black chunks of something come out of the exhaust before so thats either rust or cat

 

[24 Karat Brown]

yes, and always some confusion as to which it is and its location. one feeds ecm, one feeds temp gauge/light. the autozone guy will almost always bring you the wrong one, and you tell him its the other one. lol

I replaced the one next to the thermostat already. it was a cheap fix anyway. I dont believe mine was faulty since it made no difference. When I unplug it all that happens is it idles higher so there's no fault there

 

[24 Karat Brown]

Anyway, you need to put a scanner on it and see what's happening when it does that before you waste any more money on needless parts.

The light doesn't stay on, it only comes on after it happens and eventually goes away. Plus, I have a 1994 so its the old OBD1

 

[24 Karat Brown]

Heres a video of the issue

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You can hear at the last second how if fixes itself and idles normally