Ever hear of an engine conking out while cranking?

need RX7 · 07-17-2012, 02:08 PM

Today, I went to start my car ('86 n/a) and when the engine began turning, I heard a metallic clattering sound. I didn't think much of it, chalking it up to a heat shield rattling around or something. But, as I cranked it more, the car wouldn't start. I pulled the EGI fuse and cranked it for a while, and noticed I could hear the compression pulses out of the exhaust. They sounded even, but more spaced out than usual.

Fearing the worst, I busted out the compression tester and discovered 0 psi on the rear rotor.

The last time I drove the car (day before yesterday), it ran perfectly. I gave it a bit of a romp before pulling into my neighborhood, but it ran fine in the neighborhood and idled fine in the driveway before I shut it off. It didn't make any odd sounds when I shut it off.

What happened?

07-17-2012, 02:08 PM	#1
need RX7 Clean S4 Nutswinger Join Date: Mar 2008 Location: Sterling Heights, MI Posts: 485 Rep Power: 18	Ever hear of an engine conking out while cranking? Today, I went to start my car ('86 n/a) and when the engine began turning, I heard a metallic clattering sound. I didn't think much of it, chalking it up to a heat shield rattling around or something. But, as I cranked it more, the car wouldn't start. I pulled the EGI fuse and cranked it for a while, and noticed I could hear the compression pulses out of the exhaust. They sounded even, but more spaced out than usual. Fearing the worst, I busted out the compression tester and discovered 0 psi on the rear rotor. The last time I drove the car (day before yesterday), it ran perfectly. I gave it a bit of a romp before pulling into my neighborhood, but it ran fine in the neighborhood and idled fine in the driveway before I shut it off. It didn't make any odd sounds when I shut it off. What happened? __________________ -Ted -1986 Mazda RX7 Sport [DD/beater]: engine finally let go at 205k. parts car status. -1986 Mazda RX7 base [resto-mod project]: S5 n/a swap in progress.