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Author Topic: 90 motor in 87 problems  (Read 1887 times)

Offline the_legend_1981

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90 motor in 87 problems
« on: July 30, 2012, 03:48:31 pm »
My friend is putting a motor out of a 90 chevy in his 87(replacing 4.3 tbi). He is not getting the fuel pump or injectors to work. It fires when given some gas straight to throttle body. Is this an ecm issue? Any help is appreciated
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Offline Blazin

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Re: 90 motor in 87 problems
« Reply #1 on: July 30, 2012, 10:07:40 pm »
Did the 90 motor run in the 90 truck?
Is he trying to use the 4.3 ECM?
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Offline the_legend_1981

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Re: 90 motor in 87 problems
« Reply #2 on: July 31, 2012, 08:42:53 am »
Yes it ran and he is using the 4.3 ecm
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Offline slammed79

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Re: 90 motor in 87 problems
« Reply #3 on: July 31, 2012, 10:28:18 am »
He needs the ecm from the 90, assuming its a v8. A 6cyl ecm isn't going to power a V8
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Offline Captkaos

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Re: 90 motor in 87 problems
« Reply #4 on: August 01, 2012, 09:10:15 pm »
First is the fuel pump priming with the key on?  Do you have fuel pressure?  When turning over can you see the injectors spraying?  BTW the ECM chip and the injectors are not the same on a 4.3L vs 350...
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