Earlier cars got very decent gauge readings, proportional, equal gauge movement per temp increase with only dead zones for warm up. Example: gauges typically read what 140 on the low side, anything else under that it sits on 140 correct? You are aware the actual sensor range is likely in the negatives right? Have you ever looked at the PCMs programming? The sensor will read down past freezing and the computer can see that. It is very obviously engineered to not read that low cause its not important to deviate between 80 and 130 degrees. The reason is because the engine is under temp and running in open loop fueling in both circumstances, so its not necessary to differentiate between the two. Same would go for max temp, the gauge will likely be pegged whether the temp is 250 or 295. So between x temp and x temp the gauge used to move evenly but in the extreme lows and highs it was still. That was a full mechanical gauge. Now a days since the computer controls the gauge (98 was the last year of the mechanical temperature gauge) on every car being manufacturered they have engineered a dead zone. The sending unit DOES read actual temp ( read as ohms by the pcm) but the pcm output to the gauge slows during normal operating temp. If the engineers decide the vehicle will spend most of its time between say 185 (stat opening) and 230 (just above high fan speed setting) then when the car gets to the low end they will have the gauge more or less freeze and not resume upward movement until actual temp crests 230. The sending unit is always telling the ecm actual engine temp, but proportional movement of the needle is not taking place in that dead zone because its engineered into the gauge or pcm to act that way. Get a scan tool and see for yourself. Then slap yourself for acting butthurt. And hey, maybe we are saying the same thing just saying it different ways.
Last edited by 01ssreda4; Dec 4, 2015 at 09:00 AM.