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Originally Posted by ZeroHecksGiven
That's how we've been able to start it so far. Let it squeal for a few seconds, drop the plate, crank it and it fires up and runs until the fuel is gone (I'm assuming)
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Quote:
Originally Posted by ZeroHecksGiven
As of right now, no, we cannot keep it running. The only way it runs is with lifting the air plate. Otherwise, haven’t been able to get it to start on its own. Fuel pressure gauge should be here tonight so we can start to diagnose some of that stuff.
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Quote:
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Originally Posted by PeteKz
Also possible that you have a significant intake air leak that is preventing the airflow from lifting the metering arm high enough to activate the air flow switch, and thus powering the fuel pump. Plan to do a smoke check.
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As you say, it seems to run on fuel in the manifold. As the injectors squeal when you lift the air plate, the pump seems to work when you do that.
Does the pump run all the time? If the pump is only running when you lift the plate - and the plate doesn't move under vacuum when cranking - or doesn't trigger the switch to start the pump - that's why it won't stay running. Given that it runs at all, I wouldn't be overly concerned with CIS pressures (yet).
Disconnect the safety switch on the AFM so the pump runs all the time the key is on, and it should start and stay running. Then you can diagnose whether this was caused by safety switch dead/plate adjustment/massive air leak (apparently not unknown for gaskets to shrink, CIS injector o rings to crumble etc).