3rd Gen / L98 Engine Tech 1982 - 1992 Engine Related

86 to 89 Engine Help

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Old Dec 8, 2004 | 07:02 PM
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IROCD-U's Avatar
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86 to 89 Engine Help

We had a wrecked 86 with good engine, and a 89 with just a blown block left, top of engine was stripped off. We have swapped the 86 engine into the 89, trying to use the 89's wiring harness. We have no spark to the plugs. Does the fan motor have to be plugged in to finish a circuit for it to start? We have already blocked the security out, so thats not the problem. We're stupped. They were both 305's. 86 was an automatic and the 89 is still a manual. I would appreciate any help of what could be causing it not to turn over the rest of the way. E-mail is CrazeVixen@aol.com
Old Dec 8, 2004 | 10:40 PM
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Re: 86 to 89 Engine Help

I'm assuming it cranks but no spark. Are the wires to the distributor ok? The wires to the coil ok?
Old Dec 9, 2004 | 07:40 AM
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Re: 86 to 89 Engine Help

Originally Posted by IROCD-U
...We have already blocked the security out, so thats not the problem. We're stupped.
How did you override the security?
Did you diable the VATS in the chip?
Did you install a bypass resistor?

The VATS is designed to disable the starter, and fuel injectors. Even if you get the starter to turn the injectors won't fire.
Old Dec 9, 2004 | 11:13 AM
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Re: 86 to 89 Engine Help

If the VATS is not disabled or a resister put in place to simulate the chip on the key, the gauges will move to extreme like it is starting but nothing will work as far as the cranking and fuel injectors go. If you are getting it to crank then I doubt it is the VATS.
Old Dec 20, 2004 | 04:59 PM
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Re: 86 to 89 Engine Help

Yes it cranks and acts like it wants to start fully, and we have the chip in the key as a resistor. We have no fire from the distributer to the plugs. We need help from there.
Old Dec 20, 2004 | 05:47 PM
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Re: 86 to 89 Engine Help

If it cranks, the problem is in the ignition and probably not the VATS. Try this. Hook a plug up to the coil and see if you get spark. It could be the module in the distributor.
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