What does crank no start mean on a Miata?
It should, if it doesn’t it may mean you don’t have an RPM signal. When you turn the key to the on position confirm the Check Engine Light comes on. If it doesn’t your ECU is not functioning correctly. Remove the oil fill cap and have a friend crank the engine, make sure the camshaft is spinning. If not your timing belt has broken. Check for spark.
How can I tell if my Miata has no spark?
You can pull a a spark plug out and attach it to the wire and lay it on the valve cover. Crank the engine, you should see spark. Check cylinders one and two. One and Four share the same coil and 2 and 3 share the same coil. If you have no spark on either one or two, start suspecting Crank Angle Sensor or CKP sensor on crank.
How big is the crankshaft on a Mazda Miata?
If you’d like, verify the stronger crankshaft and larger bolt are fitted by measuring the bolt shoulder diameter to be 1.455 inches. If your Miata is a 1990 or 1991 with VIN 209446 or less, you have a crankshaft with a smaller diameter nose. (Note: according to Mazda, the European spec MX-5 breakpoint is at 127442.)…
What happens if the crankshaft nose breaks off a Miata?
If the crankshaft nose breaks off, this is easy for a mechanic to diagnose. The car will not run and the mechanic finds the pulley assembly laying on the lower splash shield. In all examples, repair is the same; replace the crankshaft. I CAN HAVE A PROBLEM WITHOUT NOTICING?
What to do if your Miata Cam is not turning?
If the cam is turning, your timing belt is not broken. It would be highly unlikely for the belt to slip enough to cause the car not to run and still turn the cams. Make sure, though, that the cam is turning and not simply flopping around. If NO: The ECU is not firing the Check Engine Light.
Why does the fuel pump not come on in a Miata?
The fuel pump relay on the NA8 is grounded by the ECU when engine speed reaches 50RPM. Power to the relay is fed through the main relay. In a condition where you have no RPM signal from the CAS the pump won’t come on. But lets make this as easy as possible. We know we have injector pulse, we know we have spark, and we know the cam is spinning.
Why is my Miata engine cranking but not starting?
It really can get that one last start out of it. There are a lot of issues that can cause your Miata to crank, but not start. The engine needs air, fuel, and a spark in order to run. It is highly likely that if the engine is cranking, but not starting that it has thrown an OBDII code.
You can pull a a spark plug out and attach it to the wire and lay it on the valve cover. Crank the engine, you should see spark. Check cylinders one and two. One and Four share the same coil and 2 and 3 share the same coil. If you have no spark on either one or two, start suspecting Crank Angle Sensor or CKP sensor on crank.
The fuel pump relay on the NA8 is grounded by the ECU when engine speed reaches 50RPM. Power to the relay is fed through the main relay. In a condition where you have no RPM signal from the CAS the pump won’t come on. But lets make this as easy as possible. We know we have injector pulse, we know we have spark, and we know the cam is spinning.
What kind of crankshaft does a 1990 Miata have?
On the other hand, if the crankshaft was strong enough to never break, the car would not weigh 2200 lbs. Keep in mind that a vast majority of 1990 Miatas are running many miles past their timing belt change and to over 100,000 miles without any problem. The 1991 1/2 and later crankshaft is certainly better than the early part.