etellier

Hi, i bought a complete tpi setup in intend to install on my 350 .

i got all i need except i dont have a clue about the wiring diagram, cuz the seller could not tell from what the setup been taken from.

so far i think it could be from a 89 corvette, i did a search with the tpi plenum upper number :10108468

could you guys give me pointers what to identify in order to successfully do this swap.

Thanks in advance.

Eric

roachjuice

the part number

etellier

As i posted, already did a search only came in with some obscure info about it could have been from a 89 corvette, i know also know that there is no maf sensor. therefore 89 or 90 corvette, i would like to confirm and get the wiring diagram for the setup i have

Eric

Vader

Does the fuel line set angle toward the left or right side of the vehicle?

etellier

Hi Vader, when lookin from the front of the engine, fan in your legs might i say, the pipes are angled to the left side of the intake which number (intake 141968 or 10066013)

thx

Eric

92blue

iTrader: (1)

The direction of the fuel lines indicate its off a Corvette. It should have external EGR provisions at the back of the passenger side on the intake.

You say there isn't a MAF sensor.... is that because it wasn't included with the intake, or is there something else you are basing this on? That plenum comes up as a 1989 casting. Its different from the 85-88 castings, and from the 90-92 castings. 89 used the 1227165 ECM, which is a MAF system.

You can however run any ECM / harness that you want with any TPI intake (that statement is not 100% correct in every situation, but close enough for practical purposes).

Decide whether you want to run MAF or speed density. If you pick speed density, figure out if you want the ECM under the hood or in the passenger compartment. Once you know what ECM you will be using, the harness issue (and the wiring schematic question) will fall into place. The above is assuming you don't already have an ECM and harness that came with it.

etellier

there is an egr, at the center rear portion of the intake, under the upper plenum, the guy who sold it to me said it was a speed density based system, there is no mass air flow involved, only a map and another thing hooked to it on the same bracket. the ecm i received with it has the service number 1227747 on it.

however i still need help for the wiring diagram that i cant find in either mitchell or alldata. thx to everybody that are helping me to get this workin.

Eric

if needed i can take pics tonight of the setup

92blue

iTrader: (1)

Thats not what I was referring to. All the TPI intakes have the EGR in the center of the manifold, but Corvette intakes don't have an EGR crossover from the heads into the manifold. EGR was externally plumbed off the exhaust, and into a port at the back of the passenger side of the intake.

Alot of TPI setups are a mix and match of parts, so just because one part is off of one application, doesn't mean the rest of them are. For example, your plenum is an 89 unit, which should not have provisions for the MAP bracket, or MAP vacuum port. Alot of folks machine a MAF plenum to resemble a MAP plenum. IF yours has the bracket installed, someone converted it over to SD, it didn't come that way stock.

You can run speed density on a 1985 TPI system which was originally MAF. That does not mean the system was originally speed density though.

1227747 is a TBI ECM and will not work for you. I am assuming thats a typo and you meant to say 1227727? If so, the wiring diagrams you need would be for a 1990 or 1991 Corvette. Doesn't matter which, they should be identical.

Pics would be a good idea....

etellier

picture to follow tonight, i will aLSO check for the ecm number. pics of what do you need exactly?

Eric

etellier

http://etellier.phpwebhosting.com/kitt/tpi/tpi.html

here are the pictures... what would be the easiest and cheapest way to get this workin, it seems i am lacking a few connector, and few extra that i cant identify, plus a few sensors that i can identify yet.

thanks for you help/

Eric

etellier

as per the wring if it can help there is 9 injector connector ?!? one side is dark green et pink-black and the other side is light green and pink-black

Guest

If there are 9 injector connectors... you have a pre-89 system on your hands and a post-89 computer. Sounds like a mix+match to me.
The base and fuel rails are off a Corvette. That black hole isnt for an EGR, its for the EGR tube that runs to the RH exhaust manifold to pipe the hot exhaust to the EGR system since the Corvette doesnt have a heat riser. Chances are the entire thing came off a Corvette, not that it matters all that much but thats what you have. You may or may not run into an issue with the fuel rail connection, depends on where your supply and return are going to be.

etellier

I have header what do i do with the egr passage that is supposed to receive hot exhaust? plug it? is this setup viable? i want to set it up on the following

350 sbc
305 ho heads
right now carbed

Eric

etellier

Hey, i found most of the connector i need, however cant find the proper ecm, anybody need a tbi ecm for an tpi, also how do i go about wiring all this toghter.

bingo

iTrader: (2)

That harness looks a mess. I hope you have a good grasp of TPI wiring. You can get an ECM at a salvage yard cheap if you get it out of another vehicle. I bought one for an 89 Corsica for my 91 TPI. There is an interchange in the tech section of this site. You will need a prom with vats removed if you plan to run an 89 or newer setup. The module in your pic is for Spark control.

92blue

iTrader: (1)

That harness is either off an 85 or an 86 judging by the old style emissions connectors and distributor connector. 9th injector was used on 85-88 setups for cold starts. However, the intake and fuel rail is 89 or later (no provision for cold start injector). System may have been converted to speed density (based on the MAP sensor and wiring which is part of the harness). However, if that is the case, its improperly done atleast in part. There shouldn't be an ESC module (next to the MAP sensor in your pic) on a speed density setup, it should have been bypassed. I would double check the wiring work done on the harness as someone has definitely done some work on it before.

That ECM is not a TPI ECM, its for TBI. It won't work for TPI. The sensor under the plenum is the intake air temp sensor, aka manifold air temp sensor.

etellier

it is intended for a 82 transam, therefore no vats included. is it possible just to swap the prom on the ecm i have?

is this setup viable? what wiring diagram should i use?

Eric

jamon8

iTrader: (3)

you should get the helms manual that is closest to the system you put together

mainly matched to the ecm year to the helms manual you buy

this will give you the best wiring diagram and the best diagnostic info

etellier

I have access to alldata and mitchell could they be of assistance?

is there a place i could get the wiring harness i have cleaned up and connector replace is it gonna be more expensive then buyin one? ive heard of painless harness, what about them?

Eric

1991CamaroRslow

iTrader: (3)

I remeber those days, having the TPI, the ECM, mix and match fittings, massive BALL of wires. I got it to work but it was no picnic, little stuff like getting the alternator to charge was the real hangup. Good luck on it, when you get a pin out for the harness make SURE you get a reliable one, not a Haynes manual one. I bought a book about TPI online and it was amazingly helpful in getting everything working properly.

jamon8

iTrader: (3)

buy a helms manual and a wiring harness from painless

there are other manufacters of wiring harness but you should go with the one with the most customer service

but before you do any of that buy the helms manual

etellier

Ok, im up to the stage of buying an ecm for my project how much should i expect to pay, from what type of car i can get one? anybody here would sell a workin ecm with one of the following number

1226865
1226870
1227165
1227730
1227727
16197128
16198260
1228331

else. i might plan to scout the wreck yard this week end
but id rather buy it from someone here.

thank you

Eric