ABS INOP Light??
 

My car is done with the LT1 swap and everything else along with it. The Z rear is in, with my 3:73 gears installed. The ABS INOP light is still on though after everything was hooked up by my mechanic. He said it may have something to do with the black box in the car or something not being compatible. All the parts came from a 97z hardtop and my car is a 97rs vert. I figured it would be the same. Why do you think the light is still on? Did they leave something unhooked up or something? Everything else is fine, other than keep burning a wire because of the headers as posted in another post. Thanks again.

Shawn

Re: ABS INOP Light??
 

I have a similar problem after my motor rebuild, but it is intermittent. I think a ground is not right, but one of my projects is to hunt this problem down. The shop manual has a pretty detailed diagnosis section on this one.

Re: ABS INOP Light??
 

I know this is going to sound funny, but check the brake light that is built into the spoiler. Burned out bulbs (there are 2 of them in there) will cause the ABS inop light to go on.

Re: ABS INOP Light??
 

Check the ground on the passenger side fender just behind the red positive block.

Re: ABS INOP Light??
 

Check the ground for your e-brake, and make sure that all your calipers are working.

Re: ABS INOP Light??
 

A spark plug wire touching or too close to a wheel sensor will do it too

Re: ABS INOP Light??
 

It sounds like one of the cars has traction control. If so that means both of them needs traction control. As you can't put a traction control rear end in a non traction control car and vice versa and have the ABS function.

Re: ABS INOP Light??
 

Well, my car had the SGS option, and the donor car didn't have any traction controls. Could that be the problem? I think he used the original module or something too. Thanks for the replies.

Re: ABS INOP Light??
 

I don't know what the SGS option is but if thats traction control then thats a problem. I believe there is a lot of stuff diff. on traction control cars, extra brake line, completely diff. ABS setup, and probably other diffs. too.

Re: ABS INOP Light??
 

SGS is second gear start. It's a button next to the fog lights that lets your car start out in 2nd instead of 1st for less torque in order to gain traction.

Re: ABS INOP Light??
 

My jet-hots burned through my driver's side ABS wire. It goes right next to the headers on its way to the wheel well. Might want to check that.

Re: ABS INOP Light??
 

SGS and TCS are nothing alike. Since you have a PCM for the LT1, you no longer have SGS, anyway. The reluctor in the rear end was not omitted during the gear swap, was it?

Re: ABS INOP Light??
 

Thanks BlownF1! That was my problem indeed. I just installed an SLP fan bypass switch which uses that ground terminal. That ground post is a "double nut" and I accidentally loosened the lower portion of it while landing a ground wire for the fan bypass wire harness.

Read your suggestion, went out and grabbed the ground wire and it was definitely loose. A quick tighten of the bolt and my ABS system is happy again. Can't thank you enough - saved me from chasing all kinds of sensor/module issues!

Re: ABS INOP Light??
 

And THANK YOU for using the "search" function. Not many people do that.

Unfortunately, BlownF1 has not signed into the site in 2-1/2 years. But good to see his advice was helpful.