I found a 3 prong plug on the TBI harness but I'm sure that's not it ( see pic of one I took at the junkyard). Then I found a male weatherpack 4 prong plug with the colors you mentioned on the old corvette ECM harness. Still looking...

 

With those wire colors I think any gm v8 computer controlled carb 83 -86 or 85-86 tpi.


http://www.mouser.com/ProductDetail/...bDmkrMXHu80%3d

 

OK, I think the above post with the picture of connector was just to the wiper motor plug. The only thing with the colors of the plug in your pic is my plug that went in the TBI dizzy. I don't use that for any reason now right? I don't know why I'm not getting this. PLEASE bear with me. I can easily hook up the TPI/hei/coil in cap as directed. I'm just not getting the part about switching wires on a plug that I can't seem to locate and what it plugs in to.

 

Sorry, I thought your previous post indicated you were going with the coil in cap dizzy.
I put a picture of the wrong side sorry 12020832.
http://www.mouser.com/ProductDetail/...ZpJYOD%2fsI%3d

 

Hi, I'm looking at doing this in a K1500 application. Currently the two tbi injectors are powered by one 10a fuse. Would a 10a circuit be enough to supply eight 22 or 24# injectors?

 

The 18 gauge power feed with a max of 20 amp draw you should only have a a 4 foot run max. but yes it will work fine this is what people are doing in the 746 to 730 conversion.

 

I JUST FOUND THE PLUG HANGING DOWN OUT OF SITE! The whole time I was looking for a plug coming out of the harness instead of the base of the dizzy. Now I can get back on track. Thanks for the help Tuned performance!!!!!!

 

I've been chasing a problem of CEL O2 sensor code. Switched to a heated O2 sensor still no luck. Finally got a snap on scanner MT2500 that says "unable to connect". Is there any changes needed for any of the ALDL wires? I'm at my wits end.

 

See our other thread E to M on the aldl

 

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cant find this thread,, this thread, is one of those threads that needs to go stickie,, I am prepairing to convert a 1989 1 ton truck from TBI to TPI and needed the repining information. My hat is off to the author, excelent work Sir!!

 

???

 

HELP PLEASE!!!! I need to know where to get a chip burned, at a reasonable cost!!! this is crazzy, I can get a tune on an LS1 ecu for $100, and my original 7730 programmer wants $250 for a memcal, what is up with this????

 

Send me a pm of what your needing done I might be able to assist.

 

So which bank does the white tbi wire go to and the red wire

 

Doesn't matter it's batch fire.

-- Joe

 

 

I repinned my '746 ecm for my '730 TPI ecm. I have a 92 305 TBI t5 car. However, I didn't have a pin in B10 on the '746 to go to BD16 on '730... Is this going to cause problems for me?

 

You wouldn't, you have a manual trans.

No problems.

-- Joe

 

Oh right. I seen it said neutral and assumed neutral safety switch for some reason thanks!

 

'91 tpi harness for sale yo . If anyone is interested .

 

Just repined my 91 RS. I did everything but the fuel pump swap and I'm getting code 43. Everything looks ok with the knock sensor and I jumped wires in the esc connector. Any ideas on why im getting code 43?

 

shorted or open knock sensor, or recheck wiring to the ESC, when I repined my truck there was a ground missing on the TPS and IAT had to jumper to a different place

 

Everything looks good on the ESC. Jumped wires C and E together. Knock sensor was working fine with the old set up. I'll replace it just in case. Wonder if the fuel pump has anything to do with the code. Haven't had a chance to upgrade the pump and filter yet.

 

ok I see why you jumpered the wires

look at these, they were for a 1988 K3500 that I converted to TPI they may help with trouble shooting

https://www.flickr.com/photos/tinbender59/10292987216/

https://www.flickr.com/photos/tinben...n/photostream/

https://www.flickr.com/photos/tinben...n/photostream/

https://www.flickr.com/photos/tinben...n/photostream/

https://www.flickr.com/photos/tinben...n/photostream/


HA!!! I think I have it, you have the wrong ign modual in the distributor, and need to loose the EST box look at the first two prints!! these prints are for the 7730 ecu

 

Why didn't any one post this in the beginning of the thread???? Ok, so I have to change out my ignition control module? And loose the ESC box? The ignition control module is on the inside of the Distributor and the TPI's have the ICM on a different location on the distributor with module having different connectors. Should I swap out the whole Distributor?

 

What? The TBI and TPI distributors are the same. The dwell setting in the module should be the same, the coil is the same.

You do remove the ESC module, aka 'knock control box', and jumper C & E essentially wiring the knock sensor direct to the ECM.

-- Joe

 

only if he has a 6 wire modual in the distributor, 4 for com with the ECU and 2 to the pickup coil. and at the very least the modual is NOT pined into the ECU as he Is still trying to use the ESC box. From what I read???

you should not need to swap out the whole distributor but you will need to swap out the internal wiring harness if you Have to switch out moduals

Pm sent to adictomusic

 

TBI and TPI distributors use the same module. It's the same distributor.

The ESC module is for knock control, because the knock circuit on TBI (and MAF TPI) is external not on the prom module.

Timing is controlled by the ECU on both TBI and TPI.

Pins E , R and B on the module communicate with the ECM.

-- Joe

 

TBI and TPI distributors may be the same for like systems but the introduction of the 7730 eliminated the ESC. or am I mistaken on the convertion to 7730???


did he or did he not go with a 7730 ECU? If he did? loose the ESC, and wire the distributor control modual into the ECU

 

You are aware of the fact that I'm the one that started this thread ELEVEN years ago, right?

You don't know the difference between the ignition control module, and the electronic spark control module.

The '730 ECM has an INTERNAL knock sensor circuit. You remove the ESC module, and jumper wires E & C together. This essentially wires the knock sensor direct to the ECM input for processing.

This has NOTHING to do with the ignition control module, found inside the distributor.

-- Joe

 

yes yes yes you are corect I get my terms messed up alot!! but he is getting an ESC code correct?? where is that comming from. there is an est input to the ign control modual?? right?? My thinking is "maybe it is not connected" or he has not removed the ESC modual, it is not needed with the 7730. at least I did not need it in my conversion from TBI to TPI? I think we are speaking diferent languages but the same subject??

 

Yes. ESC module has been removed and wires have been jumped. I'm using the 7730 with a Memcal I got from Tuned Performance who did a wonderful job. I just keep getting code 43. I didn't get this before with the tbi setup. I still haven’t swapped out the FUEL PUMP so not sure if this has anything to do with code 43.

 

You need to swap the fuel pump, but I don't think that is this problem.

I'm not sure where Tunedperformance got your memcal. If it's an actual v8 '730 memcal, i'd expect the ESC circuit to work properly. If it is a V6 memcal that has been hacked ( https://www.thirdgen.org/forums/diy-...-modified.html ) That is your problem.

If it is a true v8 '730 memcal, RBob does a good job explaining how to troubleshoot the problem here:

https://www.thirdgen.org/forums/diy-...-modified.html

-- Joe

 

Fuel pump is getting swapped this weekend. I think he did send me the V8 Memcal. At least that's what he charged me for. Voltage on the ecm knock sensor wire was 5 or 6 volts and Resistance to the Knock sensor was 980 Ohm's. I'm pretty sure that's going to be the culprit. The connector practically dissolved in my hands and the Knock sensor looked like it hasn't been changed in 20 years. Going to do this tomorrow and update you guys with the results.

 

The memcal is a v8 "P" esc filter. The external esc wires will need to be connected black to blue and a 90-92 sd 305 ks 3.9K ohm will need to be used. Tpi maf uses a 100k ks.
I can make the v6 mescals work with the external esc but this one is from a v8 730.

 

That was covered in post #8

https://www.thirdgen.org/forums/post...166-post8.html

I guess I assumed he read that before posting questions.


-- Joe

 

Problem Fixed!!!! I just had a bad Knock Sensor. She's running and purring like never before. Thanks everyone for all your help.

 

Would anyone know where I can find that re-pin table from post #2? going from a 7747 TBI harness into a 7730 ECM.

 

HERE this is the final wiring, I may ??? still have the pin to pin

https://www.flickr.com/photos/tinben...n/photostream/

https://www.flickr.com/photos/tinben...n/photostream/

https://www.flickr.com/photos/tinben...n/photostream/

https://www.flickr.com/photos/tinben...n/photostream/

https://www.flickr.com/photos/tinben...n/photostream/

here is a thread on the build

http://forum.gmtruckcentral.com/show...988-TBI-to-TPI

I have a repin sheet somewhere I'll see if I can find it and post it for you

 

I've dusted my car off after 5 years of storage and am also very interested in getting ahold of that repin table! This is great information!

 

I'll try to remember to look it up when I get home tonight, curently at work.

 

here ya go!! I had it on my personal laptop, I don't remember where I got it so don't shoot me!! lol ya may want to think about a '411 ECU???

 

ha I forgot my notes

 

This is sincerely appreciated - thanks again!

 

Sorry about that. I moved my web server to a new data center and didn't realize some older links were by IP address.

-- Joe

 

Hey thanks guys. This really helps!

 

No apologies necessary, thank you for your contributions!

 

Ok I'm sure I got most of the repinning done but I still have 4 wires left ones for a crank signal ones for the power steering pressure switch which to my understanding I don't need but I have 2 left over injector wires two went into the c11 c12 where do the left over injector wires go any help would be greatly appreciated thank you

 

You have 4 injector wires total.Two are constant power (key on), and two go to c11 and c12.

So on one side of your injectors you should have the constant power, on the other side c11.

Then on your next 4 injectors again constant power, and c12.

If you are wiring the injectors yourself (I.e, you didn't cut the wires off a harness) just twist 4 of the left wires together and connect to power, and four of the right wires and connect to c11 or c12 depending on which side of the engine you are on.

It doesn't matter which bank/side goes to which.

-- Joe

 

Hey Guys,

Great thread! I'm starting this swap in my '93 Caprice wagon. 350 TBI. I have a L98 MAP TPI intake, camshaft and 7730 ECM to go in, but am keeping the swirl-port heads. Will the factory PROM be close enough to run it, even though the heads are slightly different? Or will I need a custom tuned chip?

Thanks in advance.
-Pat