noel55

I have replaced TPS, ICU, PVC valve all vacuum hoses maf sensor as well as egr valve is working as it should. On my scanner i get different coolant temps from day to day. Yesterday when cold it showed 26c and when warmed up would not go over 62c. Today when cold showed 12c and when warmed up 90c. Fans do not come on unless ac is switched on. I have had a consistent spike in rpm's at startup. Goes up to 2500 rpm when engine is warm. Goes to 2200 when cold. It quickly comes down to where it should be. I am hoping the faulty coolant sensor is causing this. Do you know if the sensor can cause a idle rpm spike. I might add no codes shown for anything. Thanks. It is a MazdaTribute 2004 v6 btw.

Comments (2)
No. 1-1
Scotty Kilmer
Scotty Kilmer

Editor

Pray it is just the sensor and not a wiring or computer failure

1 Reply

noel55
noel55

It has been doing this for 3 years. It is driving me nuts. Other than the rpm spike it drives beautifully. With the old idle air control unit it would spike to 2000 rpm. With the new unit it jumps a little higher. I am getting incorrect coolant temp readings on the scanner although today the readings have been correct. Maybe time to sell it.