WHY DOES CAR ENGINE SURGES IN WEATHER ABOVE 70 DEGREES F.
1996 Ford Probe
June, 3, 2012 AT 1:45 PM
My engine surges when the outside temperatures are above 70 degrees, 100- rpms when stopped, 1200 to 1500 rpm when in park.
Someone from 2carpros suggested checking my ECT.
When the outside temperature is above 70 degrees F my engine surges at 1000 rpm when stopped and 1200 to 1500 rpm when in park. I have no problems at night, during the fall and winter or when temperatures are below 70.
An Expert on this site suggested checking my ECT.
OK. I checked the ECT with a ohm meter. I used a chart online as a reference. This is what I read:
68 degrees F - I read 2.3 k ohms, the chart read 37.30, my ford manual states 2200 (2.2) to 2700 (2.7). Is the Ford manual accurate?
104 degrees - I read 1.14 k ohms, the chart read 16.15
122 degrees F - I read.60 K ohms, the chart read 10.97.
140 degrees F - I read.50 k ohms, the chart read 7.70
I've not tested it at engine temperature (180 degrees F) but the ford manual states 290 (.29) to 350 (.35). I don't know if this is accurate.