an RX8er's rebuild thread
05-23-2012, 11:26 PM
#651
well we didn’t need the dogs help, my driveway was steep enough to pop the clutch and it started like a champ.
but after a few close calls with overheating we discovered 2 things:
1) I missed one of the restrictors in the upper coolant line (got the other one though
)
2) the replacement temperature sensor is fubar'd or the di-electric grease is creating resistance and its showing a 30deg difference from my manual gauges....def a problem to resolve tomorrow
other than that looks like things are good to go and I put 2.1 miles on it.
GETTING CLOSE
but after a few close calls with overheating we discovered 2 things:
1) I missed one of the restrictors in the upper coolant line (got the other one though
)2) the replacement temperature sensor is fubar'd or the di-electric grease is creating resistance and its showing a 30deg difference from my manual gauges....def a problem to resolve tomorrow
other than that looks like things are good to go and I put 2.1 miles on it.
GETTING CLOSE
05-24-2012, 09:33 AM
#659
SARX Legend
iTrader: (46)
So I was thinking about what would happen if the ECU is seeing a 40 degree difference from the actual coolant temps. Well I know for sure that if the coolant temp sensor is malfunctioning the car will run rich which explains the bogging out so we should have looked at AFR's when it was cold, I bet they were super rich or all over the place.
And I I know the ECU uses readings from it to adjust other things but what are those things?
And I I know the ECU uses readings from it to adjust other things but what are those things?
05-24-2012, 09:59 AM
#661
SARX Legend
iTrader: (46)
Yeah I was reading up a bit and it will also effect the idle on cars equipped with throttle by wire systems. So I believe it is having a huge affect and that is why it won't start and hold idle when cold.
05-24-2012, 12:15 PM
#666
Nope... the car was over heating beacouse the fans would not kick on. we finally hooked the cobb up to see what the engine temps were say on the cobb in case his RB guages were reading incorrectly... turns out the engine sensor was wrong and not the RB ones. the engine thought it was at 170 when it was at 220. Yikes!
05-24-2012, 01:59 PM
#670
If I understand what you are saying...when the car is cold....the IAT and ECT are drastically different...and that this had led you to believe that the ECT sensor is wrong ( cause the IAT is same as ambient temp)
Good diagnostic skills......Swap out the sensor and see if that helps
That much of a difference will impact a lot of different things....
Likely won't overheat when you are driving from the airflow over the rad...but it will overheat at slow speeds and sitting still
Good diagnostic skills......Swap out the sensor and see if that helps
That much of a difference will impact a lot of different things....Likely won't overheat when you are driving from the airflow over the rad...but it will overheat at slow speeds and sitting still
05-24-2012, 02:11 PM
#671
SARX Legend
iTrader: (46)
If I understand what you are saying...when the car is cold....the IAT and ECT are drastically different...and that this had led you to believe that the ECT sensor is wrong ( cause the IAT is same as ambient temp)
Good diagnostic skills......Swap out the sensor and see if that helps That much of a difference will impact a lot of different things....
Likely won't overheat when you are driving from the airflow over the rad...but it will overheat at slow speeds and sitting still
Good diagnostic skills......Swap out the sensor and see if that helps
That much of a difference will impact a lot of different things....Likely won't overheat when you are driving from the airflow over the rad...but it will overheat at slow speeds and sitting still
Let me clarify. The factory sensor VIA the Cobb was reading 149F and the Racing beat water temp gauge was reading 200F. At first we did not have the Cobb hooked up so we were beating ourselves up trying to figure why the fans were not kicking on.
We verified they were working the relays, etc and they would work with the AC on but we could not figure out why they would not come on when the temps were reading (Via RB gauge) over 200F.
I then hooked up the Cobb see if i could see what was going on and that is when I saw the temps VIA the Cobb were only 149F.
05-24-2012, 02:34 PM
#672
SARX Legend
iTrader: (46)
If I understand what you are saying...when the car is cold....the IAT and ECT are drastically different...and that this had led you to believe that the ECT sensor is wrong ( cause the IAT is same as ambient temp)
Good diagnostic skills......Swap out the sensor and see if that helps That much of a difference will impact a lot of different things....
Likely won't overheat when you are driving from the airflow over the rad...but it will overheat at slow speeds and sitting still
Good diagnostic skills......Swap out the sensor and see if that helps
That much of a difference will impact a lot of different things....Likely won't overheat when you are driving from the airflow over the rad...but it will overheat at slow speeds and sitting still
05-24-2012, 02:59 PM
#674