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About Mp2
Expertise
I prefer to answer questions relating to the Miata since this has been my area of specific expertise since 1991. I can answer questions relating to the other Mazda models however some limitation of expertise may reduce my accuracy.

Experience
Mazda technician since 1987, shop owner and specialty are regarding the Miata since 1991 covering mechanical, electrical, trim and body. Specializing specifically in drivability concerns.GKHS 1985, BVC 1987, MNA 1989, ASE Master Technician Mechanical 1995, ASE Master Body/Paint/Collision 1996

Education/Credentials
GKHS 1985, BVC 1987, MNA 1989, ASE Master Technician Mechanical 1995, ASE Master Body/Paint/Collision 1996

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Mazda Repair - timing or blown engine

Expert: Mp2 - 11/5/2009

Question
my sister had just had her oil changed and she ran out of oil because the oil drain plug came out the car didn't get hot she went maybe two miles but now it turns over fast like no compression my guess is it jumped timing when the resistance from low oil on the cam it might have jumped timing the timing belt hasn't been changed and it has 150000 miles on it and when it turns over fast i don't hear anything detonating it has a 1.6 so it shouldn't have bent the valves i was just wondering if my theory was correct about timing or does it soundlike the motor is blown also the cam is turning so i know the belt isn't broken but i think it may have jumped

Answer
What model Mazda?

No oil is a killer and death comes fast when run dry on OHC engines. You'll have to perform a compression check to test your theory as a no oil situation can cause overlapping issues. Sounds to me like excess ring to wall run out.

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