[Diy_efi] Start but dies

Tue Mar 9 02:32:00 GMT 2004

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Hi All,

  I have a motor which has a Arizona Speed MPI manifold and a GM MEFI 3 =
computer.  This is on a boat.  The boat sat for 5 years and gummed =
everything up.  I have cleaned everything and now the motor starts and =
runs well above about 1200 rpm's.  If I try to run it lower say at idle =
it dies.  I hooked a noid light into the harness and the injector signal =
gets dimmer seeming to die.  I have changed just about everything =
including the computer from a MEFI 1 to the now MEFI 3.  Same symptoms.  =
Parts changed include TPS, CTS,MAP, IAC, cleaned and rebuilt injectors =
by Sunrise injector service, new high and low pressure fuel pumps, =
battery cables (as they appeared to by as old as the boat, (1985), the =
module in the distributor.  It holds a constant 43 psi when running but =
the pressure rises as the motor dies.  This is a 502 chevy 420 hp with =
42 hours on the motor.  Got any ideas?  Also the TPS kills the motor =
whenever it is connected, this is new with the new computer.

Dennis Smith
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<DIV><FONT face=3DArial size=3D2>Hi All,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp; I have a motor which has a =
Arizona Speed MPI=20
manifold and a GM MEFI 3 computer.&nbsp; This is on a boat.&nbsp; The =
boat sat=20
for 5 years and gummed everything up.&nbsp; I have cleaned everything =
and now=20
the motor starts and runs well above about 1200 rpm's.&nbsp; If I try to =
run it=20
lower say at idle it dies.&nbsp; I hooked a noid light into the harness =
and the=20
injector signal gets dimmer seeming to die.&nbsp; I have changed just =
about=20
everything including the computer from a MEFI 1 to the now MEFI 3.&nbsp; =
Same=20
symptoms.&nbsp; Parts changed include TPS, CTS,MAP, IAC, cleaned and =
rebuilt=20
injectors by Sunrise injector service, new high and low pressure fuel =
pumps,=20
battery cables (as they appeared to by as old as the boat, (1985), the =
module in=20
the distributor.&nbsp; It holds a constant 43 psi when running but the =
pressure=20
rises as the motor dies.&nbsp; This is a 502 chevy 420 hp with 42 hours =
on the=20
motor.&nbsp; Got any ideas?&nbsp; Also the TPS kills the motor whenever =
it is=20
connected, this is new with the new computer.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Dennis Smith</FONT></DIV></BODY></HTML>

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