Question about 1994 Mazda MX-3

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Engine Dies @ 50mph, 0mph & everywhere in between

Tachometer spikes and drops instantly usually killing the engine. It happens @ 50mph or 0mph and everywhere in between. It runs fine when it's running and gives absolutely no warning before it dies. The CEL has not come on (yes, it works) 1ce since this began about 1 yr ago. At first it didn't stall, the Tach just jumped around but it has gotten progressively worse. Now it can die 2ce in 1 mile or just threaten to for 3 days. It has no problem cranking over and always restarts (so far), sometimes after sitting for 20-30 minutes. Conditions during occurrence such as temp, distance, speed, clutch depressed or not, coasting, accelerating, idling, etc…are always different. Electrical draw (radio, elec windows, etc…) doesn’t seem to affect it. I had the distributor cap replaced in 07, replaced the sparkplugs and wires 18 months ago. Checked for loose/damaged connections @ battery, grounds, & alternator. I am at a loss. No one I’ve talked to has any idea what it could be. I hope you guys have some suggestions. Thanx!

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May be the timing could also be the fuel pump or injectors

Posted on Jul 23, 2009

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Sorry to say, but you might have some serious problems. I'll list 3 vague the possibilites, best-case scenario to worst.
1. You blew a gasket, oil pan, timing cover, valve cover. Any gasket that holds engine oil in. If this blew out, you would lose oil, the light would come on (low PSI) and the motor would sieze.

2. You have a serious clog somewhere in you oiling system which caused a PSI spike, blowing a line or gasket. The clog is a problem, which comes from sludge and deposits. Oil ports, holes and lines in the engine are fairly small and not difficult to clog if the oil and filter are neglected.

3. The worst thing that could have happened is you blew your motor. Overrevving, driving to hard without letting it warm up or again, neglecting the oiling system. You may have thrown a rod through the engine block, dropped a valve, spun a bearing or lost a main seal. The main seal is the least serious, but the labor is still extensive.

In your '94, If the engine stopped on it's own (you didn't shut it off), it probably siezed. In many cases this is not repairable. Start car shopping.

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