What are they?
I know that they changed the setup a little in the years from 86-92...
What did they do??

And what are the differences between the 305 TPI and the 350?

Thanks!


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Kiz,

There is a pretty good description of the changes in the Tech Articles.

Off the top of my head, the early '85 TPI used a digital MAF and the slower 8-bit processor with MAF adapter module.

'85-'88 TPI used the cold start injector and control mounted at the front of the intake manifold.

'85-'86 used the older style coil-in-cap distributor, whereas the later styles used the separate coil.

'85-'87 used a single electric cooling fan.

'85 - early '87 used the "garbage can" air cleaner housing for the Pontiacs.

1987 and later TPIs (and most other GM V-8s) used a roller lifter and roller cam.

'90-'92 TPI used the speed density control scheme instead of the MAF used from '85-'89.

I'm sure there are other differences, but those are a few.

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Later,
Vader
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