9sectruck

iTrader: (9)

I dont know where to put this but I figured this would be the best place to ask. ( 88mm turbo build)
The car im build now is a 98 roller,
I sold the original harness and ecm out of the car and I bought a 01 ecm/harness,
I had all intentions of firing the car today, got everything hooked up and turned the key to the accessories position to check all gauges before fire up and noticed the oil pressure gauge is maxed 80psi, no voltage reading and the gas gauge is saying 1/2 tank (tank is bone dry still)

so I went over to the passenger side where the harness comes into the car from ecm and noticed none of the wires match color coated to the interior harness,
do I need to repin all this to match the ecm harness or am i missing something else?
I have checked over and over all the grounds and connections,
now there is one connection that is on the car side of the harness that i have no corresponding connector to plug in.
please help guys

socal

iTrader: (1)

so your running a 98 v8 f-body w a 99+ harness? from what i know people are re pining the 98 harness for the 99+ ecm. The fuel gauge wont work. The 98 is more like the 97 and older LT cars gauges and fuel level sender.

9sectruck

iTrader: (9)

yes 98 car, 01 ecm/harness.
I figured it woudl be just easier to switch the hole harness out

02LS1ram

iTrader: (17)

How bout getting a 99+ ECM and just reflashing it ?

TrickrTreat

iTrader: (3)

I know this says LT1 in the link address but its LS1 info, check it out might help

http://www.lt1swap.com/98-02_ls1.htm

9sectruck

iTrader: (9)

thanks.
will i be better off going back to a 98 ecm/harness?

JAX04

iTrader: (17)

Will you not find the limits of the 98 Ecm if you do that? I thought their was and issue with it and lots'O Fuel?

9sectruck

iTrader: (9)

kinda what I was thinking when i sold the 98 harness,
i didnt think the 98 ecm could control the 4l80 either.

9sectruck

iTrader: (9)

has anybody switched the harness from there 98 to a 99up with success of all the gauges working in the stock gauge cluster.
been told the gauges still may not work if i repin the harness coming through the fire wall

98Camarod

iTrader: (43)

Did you try to crank it? None of the wires are going to match, it's a different harness. I just repinned my 98 harness (pain in the dick) and they definitely don't match. I'm hopefully getting my 2002 truck ecu reflashed to have the 2002 fbody os on there this week and I'll let you know what gauges I have working. I'm sure the fuel gauge won't work, but I don't see any reason why the oil psi gauge won't work.

9sectruck

iTrader: (9)

i did crank the car but never had the fuel system on to fire it, i want all the gauges to work as this will be a street car.

9sectruck

iTrader: (9)

REPINED the harness thats coming through the fire wall yesterday and got all the gauges to work on the 98 cluster with the 02 harness except for the gas gauge, I bought a 99 up sending unit to put in the 98 tank hoping this will work?
if anybody has dealt with this please give some input,
I have tried everything as in moving/grounding the 98 sending unit

TheLS1Lover

You're going to have to re-pin or go standalone, with a new harness (I recommend Racewire)

9sectruck

iTrader: (9)

I will gladly repin but what needs repined

SCott5

iTrader: (40)

What if you replaced the interior harness and cluster from a 99 and up car?

basically just taking all wiring out of the 98 and using all wiring from a 99 and up car?

9sectruck

iTrader: (9)

LOL easier said then done. I dont have a donor car and that means pulling all the interior back out..
my opinion a wire is a wire, I just need to know where to put it or hope the new sending unit works at this point.
with all of these modded cars a can not believe no one had this problem before

Blackpanther99

iTrader: (8)

Im sure lots of people have been through this but they just havent checked in lol

TheLS1Lover

I'd Google wiring and the pin-outs, and start reading.

9sectruck

iTrader: (9)

I went through this link and repined everything that is in it but still no gas gauge working.
been doing alot of reading but nothing real solid to go off of

98Camarod

iTrader: (43)

So how do you currently have the wire and which sending unit is in there?