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Old 10-26-2010, 11:33 PM
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How To: Using TBI PCM for 4L60E Control.

Well, I finished swapping a Carb 350 into my truck, i am using the stock TBI PCM to control the 4L60E, this could be adapted to pretty much anyone wanting to use a 4L60E, not sure about a 4L80E.

DO NOT ATTEMPT THIS IF YOU HAVE EMISSIONS!

Transmission Control Via TBI PCM:

First off, Here is what the PCM needs to operate the 4L60E

-Vecile Speed Sensor
-Coolant Temp Sensor
-Throttle Positioning Sensor
-A RPM Signal

Now i did the exact same thing 04SilveradoMykk did in his thread with his Vortec PCM, But my truck was stuck in limp home mode.

Mykk's Thread on GMFS -> http://www.gmfullsize.com/forum/showthread.php?t=145089

I am running a MSD HEI Distributor, and it is what i would recommend for a similar swap, I WOULD NOT keep the TBI Distributor, you have no clue as to what the PCM is gonna do without seeing fuel.

Now with a TBI engine, there is no crank sensor telling the PCM if its running.

It took me about a week to figure out what to do, but when i did its easy as 123.

1.Find the plug that used to plug into the Distributor and lead to the PCM.

2.Find the Purple/White wire

3. Take Wire and run it into the TACH position on your HEI Distributor.

4. Done!

Picture of wire with a quick disconnect.


Here is a Picture of Holley TPS kit on my Holley 670CFM Street Avenger


Picture of whole setup on my orginial 350 with a Demon, engine and setup have changed abit since then


my Speedo, Coolant temp and all other gauges work like factory.

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Old 10-29-2010, 08:00 PM
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Thats pretty neat that you figured that out.It will prove real handy for hotrodders to have that info. You can set up your ride with a minimal amount of sensors and wiring use GM parts (Budget minded) and run locally available parts when needed for repair. ( important for the sunday ride) way to go

Last edited by latech; 10-29-2010 at 08:06 PM.
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Old 10-30-2010, 09:43 PM
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Quote:
Originally Posted by latech
Thats pretty neat that you figured that out.It will prove real handy for hotrodders to have that info. You can set up your ride with a minimal amount of sensors and wiring use GM parts (Budget minded) and run locally available parts when needed for repair. ( important for the sunday ride) way to go

Well it was pretty easy for me (Engine is in a 1994 C1500) it took awhile to get all the bugs worked out but it sure saves from having to buy a standalone computer!

Parts are cheap and plentiful! (the sensors can be found on ANY TBI car/Truck)

Plus the Holly TPS Kit is $150 and it includes its own TPS, i ended up breaking it (Off shore junk) but just replaced it with a GM TPS (Cheap and plentiful)

Thanks for the compliment! hoping it could save someone some $$
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Old 10-31-2010, 12:00 AM
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tach

i have a 1988 gmc s15 two wheel drive pickup with 4.3 litre engine how can i tell if i have a 4L60E or th700r4 trans?????and how can i wire a tach into my truck
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Old 10-31-2010, 02:00 PM
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I made this thread a sticky, good stuff.
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