Question about 1988 Ford F 250
My 460 will be running fine, then start to cut out and stall. I've replaced 2 of 3 fuel pumps. It also has a fresh tune up, any ideas on what would be causing it to stall and die? about an hour later it will start again.
On older, carbureted engines, cold stalling (and hard starting) is most
often due to an automatic choke that is sticking, misadjusted or
broken. Cleaning the choke mechanism with aerosol carburetor cleaner
may free up the choke allowing it to work properly again. If the choke
housing as an electrical heating element, the element may not be
receiving voltage when the key is on, or the element may have burned
out (check resistance with an ohmmeter).
Other causes of stalling with a carburetor include an idle speed adjustment screw that is set too low (turn screw to increase idle speed rpm). The engine may stall if the idle fuel mixture screw(s) are not adjusted correctly or the idle mixture port(s) are dirty or clogged with fuel varnish deposits (clean the carburetor and readjust the idle mixture screws for smoothest idle). Stalling can also occur is there are vacuum leaks in the carburetor, under the carburetor (bad base gasket), or any vacuum hose connections to the carburetor or intake manifold
Posted on Jun 23, 2008
All 1988 460 automotive fords were fuel injected. Carb Solutions do not apply.
Use FI troubleshooting techniques. Does it fail due to fuel or voltage?
Jumper the fuel pump pin in the computer access connector and verify pressure when the thing stalls out.
The computer will turn off the fuel pumps when the engine is not running unless in the start position or the fp pin is jumpered.
Old totally electric engines cost more to repair than they are worth unless you do it yourself!!!!!!!!!!!!!!!!!!!!!!!
Posted on Nov 14, 2009
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