1 Cyl miss, out of ideas, might sell cheap..LOL

[tomtom72]

Originally Posted by SharkPilot

Tyler,

How does a valve spring get broken when the cylinder fires with the valve part way open? I'm not doubting you at all it just seems puzzling to me.
Does it send some sort of shock up the valve and stress the spring?

Thanks,
SharkPilot

Wouldn't it make sense that the explosion could slam the valve back into it's seat sending a shock wave thru stem & to the spring? The impact would have a lot of energy to transmit somewhere? I could see the hydraulic lifter acting like an anvil with the sudden attempt to squeeze all the oil out of it, from the missfire, very quickly and the hole is too small to handle the oil flow?

If you don't have some one close by to lend you a known good ECM. I have a spare that will work for a 90 with a stock 90 EPROM in it. It's not a 90 ECM by the numbers, but one of the later ones that will work on a 90. Hit me up if you think you want to go in that direction.

Did you run down the flow chart in the FSM for a DTC 62? That could tell the state of your ECM also.

One other thought. I'm embarrassed to mention this. What happens when one of the 90's "quad drivers" malfunction? Could that cause just one injector to go dead?