Posted by Owen Aaland on May 07, 2009 at 11:40:19 from (65.165.246.54):
In Reply to: 606 fuel pump posted by youngin on May 07, 2009 at 07:47:52:
I have seen the same problem just as Pete described. The cylinder with the bad injector is not the one that has the miss but rather it is the one preceding it in the firing order.
The Roosa Master fuel injection pump depends on maintaining some residual pressure to get a sharp and even start to injection. A leaking injector will bleed off this pressure resulting in over fueling that cylinder but the next cylinder will be short on fuel because injection will start late because the pump has to make up the lost pressure before the injector will open.
You can swap a couple of injectors to make sure the problem follows the injector.
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