92 vs. 94 LQ1

[birdman]

i know putting a 94 LQ1 in a 92 is fairly easy i just wanted to make sure that i know what im talking about. from what ive gathered all i need to do is not hook up the cam and second crank sensor, correct. thanks.

[99RegalGS]

I'm pretty sure the front cover is different as well. As in you cannot use your 92 CS130 Alternator. You need the CS130D alternator.

[birdman]

im confused, what do you mean by front cover? the timing cover?

[99RegalGS]

Yes

[birdman]

the front cover wouldnt stop me from swapping a 94 motor into my car though, would it? thanks for the info.

[99RegalGS]

Not unless you REALLY want to keep the crappy CS130 Alternator. lol

[birdman]

so if i were to get an entire 94 motor and alt.i would need to change out the alt connector on the harness? correct.

[99RegalGS]

yeah. That's easy though.

[freecanadian]

Hi,

 

I'm a brand new owner of a 92 Lumina Z34 who is interested in this 94 engine upgrade topic. I thought there was quite a bit of work to do in this type of swap, since the 92 had MPFI and the 94 has SFI. Wouldn't you need a new ECM/PCM and wiring to go with it as part of the swap? The 94 has a MAF sensor that would not connect to the 92 ECM, doesn't it? Or, are you planning to run the 94 as MPFI using the 92 controlls and harness?

 

I am interested in upgrading my 3400 DOHC from MPFI (92) to SFI (94) operation, so I would be interested in any information that you could share with me, (since it seems that both posters to this thread seem to know details of this type of swap).

 

Thanks.

 

Keith (from Canada).

[slick]

You can run an SFI in an MPFI with no problems. I ran a 95 crate 3.4 dohc in my 93 for close to 2 years.

[freecanadian]

Thanks for responding, Slick94, but if your '95 (SFI) engine was installed into an older MPFI car (92 & 93) without any wiring or ECM changes, it would just run in MPFI mode, right?

 

I want to upgrade my MPFI to SFI for better performance (no more fuel puddling at the injectors), so I need to know if anyone on this board knows how to do that.

 

Thanks.

 

Keith.

[joey b]

you would need to convert to OBD 1.5 or II in order to have SFI. Your best bet is to convert to OBD II since it is much more user friendly and can be reprogrammed. Grab a computer and harness from a 96 preferably car. 97 could have the 60e or 65e so you would need to get the correct PCM for your tranny. If you can get your hands on a 65e, it is a better transmission, if you are in need of that as well. The 65e was available with other cars too, but I'm not sure if they have the same bolt pattern.

[freecanadian]

Ok, now we're getting somewhere! Thanks for the info.

 

Since my '92 Lumina Z34 has a 5 speed trans, that would mean that I need to find a computer and harness from a manual car running SFI?

 

If OBD 1.5 is easier to install to get SFI, then I'd go for that. I'm not going to go crazy on my modds, so I won't need a highly user-programmable system, as I understand is the benefit of OBD 2.

 

Does anyone know how close a matching harness I could find to my current connections (using a used ECM from an OBD 1.5, manual trans car)?

 

I don't mind adding some extra wires or even re-arranging a few pin outs, but I probably wouldn't be up to a major harness overhaul, especially if it involves interior wiring. I would be willing to tackle engine compartment wiring work if the information on how to do it is available, but going into the passenger compartment and ripping out dash and interior is just too scarry for me.

 

Am I asking too much to get SFI this way?

 

Keith.

 

[joey b]

but OBD 1.5 REALLY sucks. When you have an SES light you can't have it easily read. Not sure which may be easier for a manual, but there were no 3.4's after OBD I that were manual. Brian(something or other) did a maual swap into a later car (as did a couple of others) maybe they can chime in on that aspect.

[Vegeta]

No. Use the 94-95 ECM and forget the obd1.5 that doesn't exist for the DOHC engines. 94-95 ECM can be reprogrammed just like 91-93 because its a chip, not flash setup.

 

Things you need. 94-95 wiring harness, 94-95 ECM, 94-95 Trans from a DOHC to make life the easiest. The trans got an extra sensor that may or may not screw with the computer if its not there.

 

Performance? not likely. The 94-95 ECM runs MPFI mode over 3k RPM. I have been told OBD2 runs SFI but im not sure if its all OBD2 or the newer ECM OBD2. If you want to talk to someone that has done this conversion on a DOHC (obd2),talk to oldskoolgp. He may be on here but I know he is on 60degreev6.com.