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Engine cutting out above 4600 rpms

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Old 09-27-2008, 09:03 PM
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Default Engine cutting out above 4600 rpms

Ok 06 292 with 6.2s when running at WOT port engine cuts out for a second and tach drops about 2000 rpms.This happens very fast.If you back off to about 4 gs goes away.What I have done
Switched coil.TPS manifold pressure swith and water pressure switch with know good ones still same problem.
Changed primary and secondary fuel filters no help.I'm thinking fuel pump is losing pressure at high rpms so thats were I am at now what do you guys think?Also these engines have the Gen 3 cool fuel system that water cools the pump the housing and fuel was in my opinion hot compared to the starboard side.I removed the hoses water came out hooked a hose to one side and got a nice flow.So I am back to the pump is bad and running hot trying to maintain pressure.Your thoughts please

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Old 09-27-2008, 09:06 PM
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I thought you had fixed that. I still don't know why my brothers 271 did it for a while and doesn't anymore.
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Old 09-27-2008, 09:10 PM
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Different engine different problem.The IAC valve was bad on the starboard motor this is not triggering an alarm
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Old 09-29-2008, 09:18 PM
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Just wanted to list the problem so if any one does a search at a later date.
It ended up being a break in the injector harness were it feeds to the #7 injector.This was difficult to find because it did not do it all the time.My first thought was it was ignition but some other threads with the 496s doing this leaned toward fuel issues.When I could not find a fuel problem I just started from scratch and checking things again.Turned out it had nothing to do with rpm but the vibration at speed
Moral of the story always keep going back to basics

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