PTAaron Posted March 10, 2014 Report Share Posted March 10, 2014 After last night's overheating/attempting to bleed coolant system adventure I let the car sit overnight. Started it this morning to continue to work on bleeding it while it wasn't extremely hot. Immediately at startup the temp needle spikes to maxed out - clearly the engine isn't that hot since it sat at 20-30 degrees all night. Idle is extremely rough - putting it into gear makes it stall. Will an an inaccurate high temp reading cause this? Quote Link to comment Share on other sites More sharing options...
Schurkey Posted March 10, 2014 Report Share Posted March 10, 2014 WHAT CAR??? There may be two sensors, one to supply engine coolant temperature readings to the computer, another to drive the dashboard gauge. The dash-gauge sensor won't affect engine running. The sensor that supplies data to the computer WILL affect engine running and driveability. Quote Link to comment Share on other sites More sharing options...
PTAaron Posted March 10, 2014 Author Report Share Posted March 10, 2014 WHAT CAR??? There may be two sensors, one to supply engine coolant temperature readings to the computer, another to drive the dashboard gauge. The dash-gauge sensor won't affect engine running. The sensor that supplies data to the computer WILL affect engine running and driveability. Sorry - '94 cutlass supreme - I was typing on my phone and I thought I typed that part. My thought was bad data making the computer "think" the engine was hot when it was actually extremely cold. I just wanted to make sure I wasn't using pretend logic. Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted March 10, 2014 Report Share Posted March 10, 2014 if the ECM thinks coolant temps are much higher than they are, expect weird things to happen, like the cooling fans to kick on, along with running too lean of a fuel mixture for the engine to run reliably with cold manifolds/heads. Quote Link to comment Share on other sites More sharing options...
PTAaron Posted March 10, 2014 Author Report Share Posted March 10, 2014 if the ECM thinks coolant temps are much higher than they are, expect weird things to happen, like the cooling fans to kick on, along with running too lean of a fuel mixture for the engine to run reliably with cold manifolds/heads. Thanks, that is what I was suspecting. Looks like tonight will be "change the temp sensor and finish bleeding the system" in hopes that I don't have a blown headgasket as was suggested in my other thread. Quote Link to comment Share on other sites More sharing options...
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