Originally Posted by dave w
The ebay listing says "4L60E." Am I missing something? I'm assuming you are saying this is a good chip to program for my truck? I've read quite a few of your posts on the forum on various topics. If you say this is the chip I need, I'll order it.
Order the chip.I used two different sources to confirm that chip code BPSA is from a 95 Van 5.7 liter / Manual trans.
dave w
Ordered. Should arrive Friday.Order the chip.
dave w
Do you think this will be a direct replacement or will I still need to do some initial programming?
The chip might need some re-programming, depending on how "Stock" your 5.7 is or is not? If you have removed emissions, changed injectors, modified the exhaust system, or have an aftermarket performance intake the chip will very likely need re-programming. I would expect a factory 5.7 liter / manual trans chip would be a HUGE improvement from a factory 4.3 liter / manual trans chip for your engine swap.
dave w
The only thing that has been changed is the exhaust. The PO deleted the cat and installed a 2.5" y-pipe to 3" single with a glasspack. I'm able to use the current exhaust temporarily, but it's rusted out. I intend to go with 2.5" to an x-pipe and then... I haven't decided on mufflers yet. The PO also installed 33s, which I think made the 4.3 even more sluggish.
It won't be long before I'll want to make some changes. I've already got my eyes on a Lunati .468/.468 cam.
I guess now I need to figure out everything I need to get started datalogging and possibly try my hand at tuning.
It may be too late to question, but neither my 4.3 or 5.7 had an ESC mounted next to the throttle body. Do you foresee this being a problem? I did a quick search on AutoZone for an ESC for the van and nothing showed up. Hopefully, that's a good sign.Order the chip.
dave w
Thanks for all your help Dave!
The ESC is in the Memcal / Chip on a 16197427.
dave w
Update:
I picked up two knock sensors for a '94 k1500 5.7 w/auto trans and swapped out the ones for 5-spd. The check engine light is gone, but there doesn't seem to be much, if any, change while driving.
The chip I ordered should arrive by Friday. Hopefully that will take care of the low idle, rev limiter, and remaining issues. I'll post an update when I get the chip installed.
The wiring schematics I have access to show the V8 uses One Knock Sensor, and the V6 uses Two Knock Sensors. When you install the V8 Memcal / Chip, you might need to unplug one of the knock sensors.
dave w
Will it be ok to just tape up the plug or will I need to put in a resistor?
The truck seems to be running better since getting rid of the code 43. I should have the chip installed this evening.
My understanding was that on the 4.3L with dual knock sensors, the sensors were 8k ohms each while the single sensors on the 5.7L were 4k ohms. The dual sensors were just wired in parallel. So in theory, the 2 x 8k sensors or 1 x 4k sensor should interchange without throwing a code for being the wrong resistance.
The manual transmission knock sensor was likely 100k ohms which would explain why it didn't work. You likely could have added a resistor to it to make it work.
i also been looking at this to BPSA and getting conflicting answer about the what Tranny it is a Manual or 4l60E ???
when I use Scotts BCC look up PDF I get 1995 34734 6930 G2 LO5 5.7 Man GU6 3.42 gears
and need a manual >bin for my 4speed M-20 5.7 350 with 3.73 gears .and though this bin BPSA be a good start.Thanks
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