85 MPFI fuel problem

[sheppie62]

My fuel pump will only work with the green connectors together (near the ECM) and pulse on and off (test mode?). What should I do next?

[Skip]

you ask

"What should I do next?"

 

 

not to be a jerk, but you might want

to detail the problem a little bit more.

[Cougar]

Have you checked that spark is getting to the plugs? The pump may not run if the system does not see ignition pulses.

[MilesFox]

if you do not see fuel at the injector chances are the distributor is bad.

 

i just put spfi together, no spark or fuel, used a different disty and all good

 

check the engine code procedure described in the usrm>miscellaneous

[sheppie62]

I get good spark and engine runs briefly. The ecm blinks 1 long two short then repeats. I have hooked up the fuel pump directly to battery (both ways, I hope that didn't mess it up) It still won't start. Thanks for you input! This vechicle has been sitting for a long time, but ran good then. I have drained fuel, and added fuel system (water) cleaner and injecter cleaner.

[85Sub4WD]

I would try pouring a little gas down the throttle body. That should give it enough gas to fire a couple times, and allow the fuel pump to get fuel to the engine.

 

The 1985 FSM says that code 12 is the starter switch. Check pin 9 on the ECU (Black wire with White stripes) for 12+ V when the ignition is in start. (There should only be one wire that is black with white stripes going to the computer)

 

If it is an automatic, there may be a problem with the inhibitor switch, otherwise the harness is open somewhere.

[sheppie62]

Thanks for your input!