Hi everyone,This is my friend GR. He has a question for you 3.4 TDC guys. If anyone can help, please tell us.Ok, here he is.

Hi I would like help with the wiring of mi 3400 in to my fiero . It was origionally a 2.8/ 4sp.('86 SE ) I don't want to buy the kit, as all I need is to get the wiring sorted out. If anyone has a diagram of what changes need to be made,or can send pics of a completed one I would appreciate it greatly.

It really depends on what year 3400 you have;I got my schematic from a Motor manual that only covered electrical systems.
When it's all said and done,there are less wires to connect to your Fiero than on your stereo install(power,ground,ignition on,fuel pump,speedo,charge lamp,oil sender),however the rest must all be attended to for insurance against frying anything,as well as just re-routing to fit cleanly into the car without burning on the exhaust or anything.
The security feature must be dealt with;I used a pre-made circuit I purchased from West Coast Fiero,along with their urethane motor mounts that allows me to run without the dogbone strut.
The transmission shifter solenoid circuits(3 I think)need to have large resistors included in order to fool the ecm into believing that the auto trans is intact.

GR (C/O Danny) - As low mentioned there are a few factors involved. What year engine, what ECM do you want to run, what transaxle do you have. Options:
1) wire it up like the 2.8 (batch injection, not recommended as you lose power)
2) wire it up pre OBD-II (gives most reprogramming options and can be run with std transaxle)
3) if it is '95 or '96, wire it up with OBD-II gives best power w/ stock config, currently little tuning ability and doesn't work well with std transaxle

What year is this beast? 91-93? 94/95? 96+?9396 ECM? 6401 ECM? Flash? This makes all of the difference.

If you are running a 9396, then you can run manual trans code. No manual trans code for the 6401 or flash.

Batch won't loose power since all sequentials switch to batch at higher RPM's anyway. it just improves idle and low RPM quality. Also, the 9396 ECM doesn't even run in batch mode, it's all injectors at once. The banks aren't switched.

Questions, questions. I've installed the 9396 using a manual transmission. There are some speedo changes needed too.

Ok, I will talk to him in a few hours and find out all the specifics. then I'll post again. Thanks all.

The 6401 doesn't support a manual trans. The manual was dropped from the DOHC in 94 for emissions reasons.

I run a 94 on the 9396 using 91-93 manual trans code. That's what I would do...... You might be enamoured with the sequential injection of the 6401.

To run the 9396 you would need to add the map sensor and not use the cam sensor. Other than that, it's mostly just wiring.

Do you have any emissions concerns where your at? That might drive the ECM too.

No emissions concerns here. so basically what you're saying is get a 9396 ECM and use the Fiero map sensor? Would it be possible for you to email me a diagram on splicing the harnesses togather?
We mainly need to know what to do with making the auto harness and the stock 4sp VSS,etc work.

Yes, a Fiero map sensor will work.

The wiring is not that easy or hard. It's tons of labor. Wiring is the most work. I believe I have may still have all of the notes, but you need to have a Fiero manual and a DOHC manual either way.

Much of it depends on how anal you want to be on the installation. We tried to make it look factory. If you aren't going that far, stay with the 6401 and drop it in there.

Sounds like emissions aren't an issue.

[This message has been edited by terryk (edited 03-02-2001).]

Also must mention that the install ('97 0DB II ECM)was only successful with the help of a fuel controller purchased from Split Second for around $400;the car wouldn't run right without some slight tweaking,still has an occasional high idle problem that's fixed by turning the ignition off and starting up again,otherwise very smooth.
Most people do think it's a factory install from the carefull routing job of the wires,and use of the cheesy OEM,black plastic wire covers with tape.
It was much easier to make it look factory than to use the spiral type of wrap that is of a higher quality.
The GM airflow meters are prone to destruction by vibration,I found this out on the way to work(45 miles from my home)one morning.A quick scan of the trouble codes indicated the problem,now I have re-mounted the mass airflow meter using oem,accordion-like hoses compared to the very short and rigid connections I'd had before.The hoses are all right around 3" I.D.and actually help the midrange compared to the 4" intake plumbing I'd used before,with a slight penalty on top end power,however.