New Crate Engine 454 up and running
Little over a month ago my 1991 pace arrow blew the engine. Finally got it up and running again with a new crate engine. Just about dialed in now. One problem: seems to be backfiring thru the TB...
Forum Discussion
You could try running near full throttle instead of full throttle. Then it might set a code. Not knowing which ECM is being used, some ECMs do not have tables above 3000 RPM, so I don't know if it will trigger anything or not. It would probably do best to get a fuel pressure gauge. See if the pressure drops any in the higher RPMs. Call your local AutoZone. They have tool rental and may be able to rent you a pressure tester cheap. They also sell them for 50 bucks.
One other thought, not sure what they do with TBI, but I know with port injection, there is a pressure regulator that is vacuum controlled. When the vacuum drops, the fuel pressure rises. If this vacuum hose was routed incorrectly, it could be connected to a source that does not really have the vacuum drop off, so the pressure would not increase under higher throttle positions.
One other thought, not sure what they do with TBI, but I know with port injection, there is a pressure regulator that is vacuum controlled. When the vacuum drops, the fuel pressure rises. If this vacuum hose was routed incorrectly, it could be connected to a source that does not really have the vacuum drop off, so the pressure would not increase under higher throttle positions.
