Hello team BITOG! I need your help with some direction on a little (I hope) issue with my Miata.
First off, I have a relatively new to me 91 Miata that has 175k, that up until this past week has been running well. I have been restoring the cosmetics of it over the summer.
While driving home the other day, the car started losing power, although it is not strong in general anyway. I had the A/C on, the car was hesitating at idle. In the last mile or so of a 10 mile trip, I heard the faint sound of pinging. All gauges were normal (oil pressure was fine and coolant temp was normal). When I arrived home, I heard a boiling sound and found the coolant in the reserve tank boiling.
I let the car cool, and parked it in the garage,and there it sits (it is an extra vehicle). I checked all of the fluids, all levels are normal and I don't readily see oil in the coolant nor coolant in the oil. The oil has maybe 300 miles on it.
Here is what I have done to the car mechanically thus far (prior to this issue).
New NGK plugs and wires (the blue ones).
New valve cover gasket and CAS (camshaft angle sensor) seal.
***after replacing these, I still have a sizable oil leak that the car has had since purchase- the VCG was toast and it was easy to spot the many leakage area's)***
Converted the non-working A/C to 134a and blows nice and cold
LOF with Castrol High Mileage 5w30 and pure one.
Outside of this new issue- the car is rock solid and drives great. I have not started it since the boiling occurred. The radiator looks newer to the car- although the PO had not replaced it in the past couple of years that she owned it.
Before I start throwing parts at it.. any ideas? Where to start? My thoughts were radiator cap and t-stat.
Thanks!
First off, I have a relatively new to me 91 Miata that has 175k, that up until this past week has been running well. I have been restoring the cosmetics of it over the summer.
While driving home the other day, the car started losing power, although it is not strong in general anyway. I had the A/C on, the car was hesitating at idle. In the last mile or so of a 10 mile trip, I heard the faint sound of pinging. All gauges were normal (oil pressure was fine and coolant temp was normal). When I arrived home, I heard a boiling sound and found the coolant in the reserve tank boiling.
I let the car cool, and parked it in the garage,and there it sits (it is an extra vehicle). I checked all of the fluids, all levels are normal and I don't readily see oil in the coolant nor coolant in the oil. The oil has maybe 300 miles on it.
Here is what I have done to the car mechanically thus far (prior to this issue).
New NGK plugs and wires (the blue ones).
New valve cover gasket and CAS (camshaft angle sensor) seal.
***after replacing these, I still have a sizable oil leak that the car has had since purchase- the VCG was toast and it was easy to spot the many leakage area's)***
Converted the non-working A/C to 134a and blows nice and cold
LOF with Castrol High Mileage 5w30 and pure one.
Outside of this new issue- the car is rock solid and drives great. I have not started it since the boiling occurred. The radiator looks newer to the car- although the PO had not replaced it in the past couple of years that she owned it.
Before I start throwing parts at it.. any ideas? Where to start? My thoughts were radiator cap and t-stat.
Thanks!
