cranking problems

[granny]

Ok guys, we bought 2 1993 Festiva's one has 136,000 miles and the other one has 74,000 miles been working on the one with 136,000 we can not get power to the fuel pump and it is just like the injecters are not getting power we bought new fuel pump know it works, bought new fuel pump power relay. We just don't know what else to do we do not know a lot about the fuel injection as my 89 i drive all the time has a carb. love the cars but this one is getting to us. any ideas will be welcome hate to junk them but we don't know what to try next. Thanks

[ryanprins13]

Ok guys, we bought 2 1993 Festiva's one has 136,000 miles and the other one has 74,000 miles been working on the one with 136,000 we can not get power to the fuel pump and it is just like the injecters are not getting power we bought new fuel pump know it works, bought new fuel pump power relay. We just don't know what else to do we do not know a lot about the fuel injection as my 89 i drive all the time has a carb. love the cars but this one is getting to us. any ideas will be welcome hate to junk them but we don't know what to try next. Thanks

Did you check the inertia switch?

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[granny]

Yes we have. We have also traced the wiring, we have had the whole dash out everything just don't know what to try next.

[ryanprins13]

Ok. Iirc fuel pump only gets power when cranking and it sees air moving past the vaf. With just they key on it doesnt pump.
Is the vaf plugged in?
Can you swap in the one off the other car to see if it makes a difference?

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[ryanprins13]

Perhaps the vaf vane is stuck inside there if it sat a long time. Also if you have a large vaccum leak it may not draw enough air past the vaf?

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[mikemounlio]

I have my pump on a switch. Its not the best idea in the world but it does work.

[FestYboy]

A multi meter will go a long way with this diag...

[granny]

Thanks guys, the trouble we are having is no power to fuel pump, injectors, or distribuator have checked or changed every thing we know of tested for voltage used test light for power nothing works.

[firebush357]

Start at the Battery and work your way from there to see where you lose power. Probably at the Fusible Links

[FestYboy]

You can't use a test light for the dizzy, that's a low voltage system and a test light can fry it easily. Use a multi meter.

Main and EGI links must be good to test anything else. Then the ignition switch. There's also a main relay that needs tested before any power gets to the affected systems.

[firebush357]

You can't use a test light for the dizzy, that's a low voltage system and a test light can fry it easily. Use a multi meter.

Main and EGI links must be good to test anything else. Then the ignition switch. There's also a main relay that needs tested before any power gets to the affected systems.

Test Lights should not be used as a diagnostics tool, specially on newer cars with computers everywhere. Like FestyBoy has stated, Test Lights can fry components really quickly. You can get Multi Meter at harbor freight or Amazon for less than $15 and they can tell you so much more than a test light will.

[bolokid]

I had the same issue on one of the Festivas. Turned out to be the vaf. If not working properly it cuts power to the fuel pump.