Frankenstien in progress, found speed bump.

[95SleeperAcheiva]

OK, the price was right, besides, I needed a test bed.
chassis: 1986 Olds 88
Spun a rod in the 3.8, threw out the motor.

new motor, 1997 Olds Aurora 4.0L v-8, bone stock.

I got the motor, trans, radiator, stock harness, every module under the dash and any block box I saw in the car. It took me 2 hours to pull the motor and trans in the junk yard, and 8 FREAKING hours to get the harness out! Next 4.0L gets custom ecu and I'll make the harness.

Now to make it work.

Speed bump: Passkey. Yes the little box that reads the resistance of the key. I don't have the key, and since I'm using the stock 1986 chassis and column, I don't have a resistor sensor in the column either. The car was in the junk yard. I do have the vin#. But, Isn't there a way to by-pass this thing? Like just by-passing a POS aftermarket alarm? I am looking at a diagram for the pass-key module, I see 2 circuits that are fuel and starter disable, both have to do with the pass key module communicating to the PCM. So, I wonder, can I just not wire it in, bypass the starter enable relay, and supply ground to the fuel enable circuit off the pcm? Should work right?

[IsaacHayes]

Eh, dunno, the ECM probably won't fire the injectors if it doesnt have the signal..

IIRC the passkey signal to the ECM is a certain voltage at a certain frequency. You could rig a voltage regulator LM317 comes to mind, and then a 555 timer to do the frequency. Or buy a bypass module which woulddo the same.

[95SleeperAcheiva]

Of course there is the other option, I was wrong about the stock key, it does have a resistor in it, so I geuss i could wire it all in and then replace the passkey module with a new one and program it to the stock '86 key. I'd really rather not have the module at all.

[ForcedFirebird]

Well the problem lies in you not having the key. When the passkey fails, most people will measure the resistance on the key, and "hot wire" the resistor directly in the wires. How do you know the value of the resistor needed without the key?

[Superdave]

Well the problem lies in you not having the key. When the passkey fails, most people will measure the resistance on the key, and "hot wire" the resistor directly in the wires. How do you know the value of the resistor needed without the key?

Rheostat?

[ForcedFirebird]

Rheostat?

Isn't a rheostat voltage-based? If there is a resistance rheostat, you would think it will work, just measre the resistance as you test, and place the proper resistor in line

[Superdave]

Isn't a rheostat voltage-based? If there is a resistance rheostat, you would think it will work, just measre the resistance as you test, and place the proper resistor in line

you'd just wire in the rheostat and turn it till the car tried to start.. then measure the resistance and solder in a resistor.


I seem to remember seeing that on the 3rd gen boards a long time ago...

[IsaacHayes]

rheostat = variable resistor (potentiometer). Yeah you could try that, but it might take a while..

Do a search and see if common values are used... I think how the passkey works is it will start for a few secs then shut off. So you may be doing that over and over.

[Superdave]

http://www.vatssucks.com/

It could be disabled in the chip in the OBD1 days, not sure about OBD2 though...

I'd personally try running that engine on OBD1 with a wiring harness from a TPI 305 Camaro and the propper code. I'm sure there would be other hurtles to overcome though...

[pocket-rocket]

http://vats.likeabigdog.com/

VATS # (K)OHMS (Set your meter to the 20k ohm setting)

1覧覧 0.402
2覧覧 0.523
3覧覧 0.681
4覧覧-0.887
5覧覧-1.130
6覧覧-1.470
7覧覧-1.870
8覧覧-2.370
9覧覧-3.010
10覧覧3.740
11覧覧4.750
12覧覧6.040
13覧覧7.500
14覧覧9.530
15覧覧11.801

[siKKa]

fined the resistance of the key and wire up the correct resistor? this worked in a scrap car we feilded for fun, im not sure if its a permanent solution, but it worked for a couple hours while we trashed the car

[pocket-rocket]

Well since the VATS unit needs to see the resistance to let the car run, if it is wired in permanently it will be a permanent solution. At least GM didn't use that many resistance values making it easy to find the right one.

[95SleeperAcheiva]

Since I work with them everyday, I went to my local dealer and they looked up the vin#, found out the key number, got me a key, they had in stock, ohm'd it, I bought resistor, a buck, and wired it in, whole comp system lit up perfectly! Thx guys!