Help Needed: 90 motor into 95 chassis

[AZhitman]

Can I get a basic rundown of the differences between the two, so that I can plan out part purchases?

Looks like there's more differences than we anticipated, including the ignition system and much of the emissions controls.

[elwesso]

the easiest thing for you to do is get a complete 90-93 ECU harness!

[maxnix]

I hate to say it, but just don't do it. Get a 94-95.

[3Q Jay]

all short blocks are the same. you already know the heads are different.the CAS is different. that one may be the biggest bugger.

you found a crate engine for a '90? if so, i could contact daedalus for you (another guy who's been away even longer than me). he has a 94 crate motor in his garage. AND a virgin short block. man i about wet myself.

anyway he is thinking of swapping the '94 crate motor into his '90, but faces the same issues.

no, you can't just swap CAS.

[AZhitman]

the easiest thing for you to do is get a complete 90-93 ECU harness!

Not a bad idea Wes...Wonder if PopPop has one available?

I could throw in one of Rob's good ECU's then too...

[Q45tech]

Remember the 94 emisson max levels are lower. so in theory a 90-93 engine in a 94 Q is non compliant.............oval ports, injectors, and primary catalyst different.

You can swap a newer engine [of same size or lower] in the vehicle but going back is prohibited by Clean Air Act.

All about grams of polluntants per mile driven.

[AZhitman]

Any more advice?

I'll be fitting new cats, deleting the precats...

[AZhitman]

Anyone? Bueller?

[elwesso]

get the new harness and youll be fine...!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[PopPop]

Anyone? Bueller?

I know Greg that 89-92 transmissions are the same! 93&94 are the same and 95 are one year only may have to switch it out and may not! Might have to swap out TCU because ECU still works with TCU as a unit for Optimum Performance! You will also have to switch to the 90-94 MAF!

[AZhitman]

Ty, you have a 90-93 engine harness?

[Q45tech]

Careful about harness swapping as AC aux fan is controlled by ecu.

[maxnix]

Careful about harness swapping as AC aux fan is controlled by ecu.

I just have to think it is a real step backwards to try to mate a pre 1994 engine harness to a later loom. Seems like it would have to be custom and thus expensive, or time consuming.

Whatever, good luck!

[elwesso]

you dont have to switch to a 90-94 MAF, you cna just use the later MAF connector from your other harness...

The aux fan idont think woudl be an issue since it doesnt come on unless the engine is technically overheating, and i know greg uses AC most the time, thus itd be on for the AC anyway.

[maxnix]

The aux fan idont think woudl be an issue since it doesnt come on unless the engine is technically overheating, and i know greg uses AC most the time, thus itd be on for the AC anyway.

Really? Not for me, but it is a two speed unit where the earlier is a single speed.

Trace enough of the loom differneces and cutomize the engine harness and all will work fine. Just seems like a false economy to me. But it's not my project.

[AZhitman]

OK - Well, we can work around the aux fan issue.

Hell, I may add two low-draw, high-CFM e-fans anyway. And an oil cooler.

Any other issues we might encounter?

[maxnix]

Hell, I may add two low-draw, high-CFM e-fans anyway.

The FY33 has this superior configuration.

[AZhitman]

Good. Done deal.

Where's that Dennis guy when I need him...

[maxnix]

Good. Done deal.

Where's that Dennis guy when I need him...

Lest I create confusion, these fans are primarily for the condenser. It still retains the viscous clutch engine driven fan for the radiator.