Jamie Calder wrote:
> A while ago I posted a problem I had with my '93 318 where cyl 1 and 7 don't
> fire. A compression test shows there no compression at all in those 2
> cylinders. Before I take the valve cover off for further inspections, would
> anyone like to speculate? Why those 2 cylinders at the same? Are those 2
> always in the same position? What would cause 2 to go at once?
> What would be the best case scenario? Rockers or pushrods, right?
>
> Thanks,
> James
>
>
1-8-4-3-6-5-7-2 - is the firing order. The number 1 and number 7 are
the front and rear two on the drivers side bank... Why the two are not
getting compression, is a little odd.
You either have a situation where the timing is off, and the piston is
hitting TDC while you have a valve open, you have burnt/broken valves,
or you have damaged pistons.
Odds are - if the timing has not been fussed with, and the chain in
intact, you have bad valves. I could see if you had no compression
between two common cyls, (indicating a hole on the block or head)... but
two opposites? Its not impossible to have fubard pistons... but it
would take some serious destructive force to take out two of em.
Why do I not suggest rings? Because even with bad rings, you should
still have SOME compression, be it very low. If you have ZERO
compression, I'm suspecting valves.
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