hey guys i got my car to do a 3*00 swap im in the process of gathering parts. the car is a 97z my question is can some one give me a more detailed how to on piggy backing the 3400 ecm and the cav pcm to run the gauges. i.e. wat if ant sensors do i need to have muliples of or do i just splice into the existing sensors? any incite greatly apperciated.
did you search on v6 swap sticky? only read it thru a couple of times but its pretty use ful plus there is links to other sites with use ful info
i skimed it but ill give it another look
It's been like 4 years since I did mine,-- depending on what harness you have, you need to have the engine (donor) run by itself, the cavi guages run off the "uart" ?? line from the j pcm- so it needs to operate too, but not for the injectors and such. -- oil press, water temp etc must be t'd with the old sensors added to the new engine. others have been able to run a 3 wire temp sensor and make it work, I just welded in a new bung in the bypass tube and used the old sensor. also, dont forget about the passlock system!! very important
ray gardner wrote:hey guys i got my car to do a 3*00 swap im in the process of gathering parts. the car is a 97z my question is can some one give me a more detailed how to on piggy backing the 3400 ecm and the cav pcm to run the gauges. i.e. wat if ant sensors do i need to have muliples of or do i just splice into the existing sensors? any incite greatly apperciated.
I don't know how to piggyback to GM PCM's. Because both of them are going to want a speed sensor input.
why does the v6 need a speed sensor input to operate-???
i thought this has been done or has it just been discused
just do autometer guages much easier, all the wires you need are under your dash
JBO since July 30, 2001
im deleting the cav's engine harness and ecu and did u kick that mustangs ass
if at all posable i would like to retain the stock gauges and i really cant aford to by 200$ of autometer gauges and get the car goin but it is my plan b.
john beers aka thebondoman wrote:why does the v6 need a speed sensor input to operate-???
On new cars you get a CEL without a VSS being hooked up. Also the PCM's (for quite some time) at least on manual transmission cars will hold the idle speed a bit higher until you drop under a certain MPH (4mph or something of the sort). I'm not sure why they do this, just know that they do.
john did you have a problem with vss or any sensor for that matter which ones needed multiples and were u able to splice any or mabey use a three wire temp sensor. if i could that would be awsome because i plan on using a 3500 and that uses a 3 wire sensor and is a pain to convert the bung to a 2 wire.
now my brain hurts from thinking
I used a 01 grandprix engine, pcm, radiator and fan assembly // added a second temp sensor-jcar- onto the bypass coolant line- easy. ran a jumper from the gp pcm to the charge idiot light (under the hood), I added a main fuse and relay at the fuse box for a second fan. since the a/c is pcm controlled, I wired the a/c switch thru a relay to fool the gp pcm to turn it on--- all the wiring using relays was routed thru the j fuse /relay setup
i did not have any issues with the vss, had a 5sp. but I did have to change my fuel pump.
another very important item-- you must use an upgraded clutch. I had a stock 2.2 cluch,-- street driving was ok, but at the track it slipped at least half way down the track and gave me a slow 60ft time of 2.39
used the donor transducer and key to bypass the passlock system
hope this helps
im prob gonna use like a stage 3 clutch. all this will prob be alot easyer wen i have both harness infron of me and i can go through them wire by wire and figure out wat im gonna use for wat. i plan on gettin the motor runnin on the G.A. ecm with the pass lock and auto codes removed and then ill tackle gettin the gauges to work. all this incite has gave me a good idea of wat i have to do but still kinda confusing the hell out of me. lol
I would recommend having both
gm service manuals- your vehicle and the donor - they have complete wiring and pinouts- includes colors, wire size and circuit id codes
yea im gonna get at least the hanyes manual and i have access to all data
ok im in the process of the piggy back as well but i disabled the speed limiter on the gtp ecm but will i need to run the vss through the cav ecm or gtp
my kill list:a geo metro and a mac semi wow did i kill that thing
the VSS is needed for the cav pcm to operate the speedo
thank you sure sorry for thread jacking
my kill list:a geo metro and a mac semi wow did i kill that thing
jacking is ok if it benefits all !!!
