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I believe it's the coil packs that can be damaged. I just unplugged mine, and pulled out the fuel pump fuse. The motor won't wind over with the coil pack fuse pulled.
I believe 155psi is the figure for low compression motors.
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I'm a little late to this thread but I just want to back up what a few other people have said with regards to the cap.
I just bought a brand new one when I pre-emptively overhauled my cooling system and it was dead on arrival. It just wouldn't hold much pressure and every so often spewed out my fresh coolant.
I put the old one back on and it's back to normal. Just something to check again, even if for the tenth time, to be sure. It can sometimes be the little things...