Zero Compression - why?
 

After driving off the freeway, my '93 GT started to shake as if it had a vacuum leak. The car will then not start unless I pump the pedal.

Then it starts, the idle is VERY rough , the car would shake and the engine would die. I checked the hoses, replaced the EGR and fuel filter but the problem was still present. In order to get my Mustang to idle, I needed to increase the fuel pressure and TPS voltage.

I took my car to my mechanic and he did a compression check. He found that there was ZERO compression on each cylinder on the passenger side.

What would be the cause of this? Blown head gasket? Valves?

As the engine is being disassembled, what more can i expect?

Bent valves on that side.
Did you see any smoke before or after it runs?

Like Nitro said, sounds like bent valves

A leakdown tester will pinpoint area

There was no smoke. Mechanic said maybe the "lifters"? Hasn't looked at it, yet.

Not lifters....
 

Nothing against your mechanic, but if the lifters were bad, they'd make a hell of a lot of noise, and they would also tend to keep the vavles CLOSED. Hydraulic lifters collapse and get shorted when they go bad. If you have zero compression, the lifters would have had to "grow" to hang the valvles open.

I'm with nitro too. Probably jumped the timing chain a tooth or 12, and bent the valves on that side.

I had a similar problem before, and it was 2 bent valves. Make sure he checks the spring pressures before reassembly.

Thanks.

If problem is indeed valves.. What brand would be considered top quality? Whatever is done on that side, i'm going to have done on the other side regardless. If the valves need replacing on the bad side, i'm going to have them changed on the other side as well..

I know.. more $$$.. but it's a personal superstition, i guess. :)

BTW- you ever notice that when your Mustang is out of commission, you see more hot rods on the street than you would if you Mustang is running?

what caused the valves to bend? I'd replace the timing chain and gears while it's down.

Amen to that... it's so very true. Not only that, but it always seems all the good stuff comes up that you could have taken your Mustang to (shows, races, etc) when it's out of commission too. Ahhh, such is life I guess...

Regardless, I am in the same boat as you actually. I seriously over revved my engine accidentally during the NMRA World finals last fall (probably to 10,000+ RPM) and I bent ALL the valves in my engine. Every cylinder pumps zero except number 6, which only pumps 90 psi. OOOPS. So, with the weather quickly warming up I am about to start ripping the motor out, and down, to change out all the valves, check the rest of the heads over, check the bearings.. etc... and set everything back up for the season.