2.7 MFI Engine Problem

[billytan]

Hi. I have a 1972 2.4E fitted with an engine built to 2.7 Carrera spec, correct 2.7 MFI pump, with 2.8 pistons. The engine pulls beautifully till about the 5300-5500 rpm, when it will suddenly loose power and retard dramatically. Easing off the accelerator will have it functioning again as long as it is below the 5300-5500 rpm level. The fuel tank had been cleaned out and lines checked, fuel filter changed. The electric fuel pump pressure on the output side was measured at 8 psi. Having checked that factory specs for the pump output is 12psi plus/minus 3 psi, which makes minimum acceptable at 9 psi, I have installed another bosch pump and had increased pump pressure to about 15 psi, but it did not solve the problem. MFI belt renewed and position checked- correct. My mechanic now thinks it could be the CD box or the MFI pump. Before I do any more work, has any member experienced this before? Any opinions will be most welcomed. Many thanks, Billy.

[BK911]

I'd start with dwell and then ignition timing. Search for check measure adjust for tuning the MFI. Lots of good stuff there.

[daepp]

Sparrrrrrk!

Check the dizzy. Advance? Vacuum leaks? I'm just sayin'.

[Grady Clay]

Billy,

You can ask the Forum Modorator to combine this thread with the other one on the same subject, eliminating this and duplicate posts.

This makes searching more productive.

Best,
Grady

[Rusty 356]

Have you checked fuel pressure as well as fuel volume?