89TbirdSC crank no start, Possibilities??

[Sleeperdude97]

I'm currently working on a 1989 Thunderbird, and I've hit a road block on getting it started. I've had a couple mechanics come check it out and I've got a bunch of different answers from them. I checked spark, fuel pressure, fuel lines to see maybe if fuel wasn't getting to the engine, injector pulse, i replaced the harm balancer, and inertia switch. But for some reason it just cranks but never cranks over and stays running. would love some advice/ professional opinion's on what could it be.

 

[DOUG H]

Any codes logged? What lead you to replace the inertia switch & balancer?
If you've already had mechanics look at it in person & they didn't know, not sure what more I can suggest.
What was wrong with balancer, maybe it damaged the crank sensor when it failed or you damaged it when you replaced it & the crank seal. ? If inertia switch failed, maybe a short in fuel pump or wiring? Is there tach movement when cranking or does shift light go out?

 

[Sleeperdude97]

The reason I replaced the inertia switch was because that’s what one of the mechanics said, he said it was making an unnecessary rattling noise. Same thing with the harmonic balancer he had said it was wobbling. And I checked for codes, but nothing popped up.

 

[David Neibert]

The reason I replaced the inertia switch was because that’s what one of the mechanics said, he said it was making an unnecessary rattling noise. Same thing with the harmonic balancer he had said it was wobbling. And I checked for codes, but nothing popped up.

Like Doug already mentioned....If balancer was wobbling, that probably damaged the Crank Position Sensor.