1990 302 Efi First Startup Issues

Discussion in '1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-' started by MustangMando, Mar 3, 2014.


  1. MustangMando

    MustangMando Member

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    Hi guys, just installed and rebuilt a foxbody 302 efi from a 1990 mustang and dropped it in a 68 mustang. I left the motor stock except for for an e303 cam. I added a new stock flywheel and clutch. I had the t5 and had been using it before. I started up the car and noticed vibration in or on the t5 at idle. So i added some fluid(atf), since it had lost fluid when i droped the trans. I drove it around the block and motor seems not to accelerate even though rpms seem alittle high. At fifth gear the car begins to have alot of vibration. At idle and at fifth the t5 has vibration. I pulled the transmission out during the build and tilted over, dont know if this matters but like for people to have all info. It is a v8 t5, was working properly before i pulled it off motor. All is new, pilot bearing, flywheel, clutch, pressure plate, throwout bearing and even bolts.

    Thanks any info helps
     
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  2. 84Ttop

    84Ttop They make new pistons every day, so why worry? SN Certified Technician Mod Dude

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    Do you have the proper balancer and flywheel for the motor? Stock would be 50 oz imbalance for a 1990 motor unless you have changed the crank in the motor for some reason. They make neutral/internal balance and 28 oz imbalance as well. Is it possible the flywheel is wrong?
     
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  3. MustangMando

    MustangMando Member

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    Just ran the casting number and the motor seems to be from a 91 thunderbird 302 HO, does that change anything? The flywheel is from orillys and is a 50oz balanced
     
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  4. 84Ttop

    84Ttop They make new pistons every day, so why worry? SN Certified Technician Mod Dude

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    Front balancer is a 4 bolt 50 oz balancer? Is the crankshaft original?
     
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  5. 84Ttop

    84Ttop They make new pistons every day, so why worry? SN Certified Technician Mod Dude

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    Are you using the correct firing order? 1-3-7-2-6-5-4-8.
    Carb or injected?
     
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  6. elarm1

    elarm1 Active Member

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    That would be my first guess as he may not have a "HO" motor/cam. I would try the other firing order for Non HO and see what happens
     
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  7. 84Ttop

    84Ttop They make new pistons every day, so why worry? SN Certified Technician Mod Dude

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    Op says he installed an E cam which is HO order. I'm wondering if it was a non oh cam before and the firing order is wrong.
     
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  8. elarm1

    elarm1 Active Member

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    Good catch, I missed that part. He must be working on it... Tis why we haven't heard back
     
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  9. stykthyn

    stykthyn Commander of the snuggie cultists

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    Did the trans slide right in or did you have to force it? I have seen a couple instances where the input shaft caught the pilot bearing.
     
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