nor11384

iTrader: (1)

ok guys this is been happening to me for a while now that its cold...so its been like 50* here in tampa lately and car warms up to operating temps just fine...i do a 3rd gear pull on the highway and start cruising and notice that my coolant temp is at like a 1/4...car was running very cool...turned the car off at my destination...get back in the car to go, get to operating temp...after a while i notice temp at a 1/4 again...can the car be going back to open loop if the temps are this low or do i have this closed loop and open loop thing wrong? what can be causing the temp to go this low? can thermostat be getting stuck open or something? thx...

meckert

iTrader: (11)

Yes, on both counts---thermos sounds like its stuck open and yes, that will effect open and closed loop operation as part of that depends on engine temp.

nor11384

iTrader: (1)

damn it...i wonder if thats the reason that pull felt slow...maybe it was in open loop? i guess i can try a new thermostat and see...

barneyb

Another possibility is if the intake to firewall ground is disconnected or flaky the gauge will provide an incorrect reading.

nor11384

iTrader: (1)

ill check it but its not jumpy or anything...

barneyb

Sometimes it is a good idea to scan the engine coolant reading at the ECU and compare it to the gauge reading. There are separate sensors for the gauge and the ECU.

nor11384

iTrader: (1)

i can do this with evoscan right? if so, can it be monitored live while the car is running with evoscan?

barneyb

Yup.

nor11384

iTrader: (1)

awesome i will try it...i ordered a thermostat and radiator cap from the dealer so lets see what it does after i install it...i will check it with evoscan also...thx barneyb...