z28kid911

Hey i have just got a beautiful blacked out 94 z28 lt1 automatic trans, flowmaster exhaust, subs, and at one point it had a programmer chip installed and idk if it still is. I am going to get the car checked out, gonna get all the fluids checked etc.

My major concerns are first (the trans feels like it shifts good/smooth) but when you floor it all the way in first it hits the rev limiter.

I'm somewhat new to z28s cause i had a 95 3.4l v6 before.

From my experience the 94 was first year with electronic regulated shifting, could that be a problem? I'm going to check the transmission fluid and everything but am i going to have to rebuild my tranny potentially? Could this be a semi cheap repair or guaranteed high dollar repair?

It shifts fine if you left off or accelerate slower but something isn't adding up. The shifter also was in normal drive but the it indicated that it was in 1st (idk why) (auto tranny there is Park, Reverse, Nuetral, Drive, Overdrive, 2nd and 1st. And the 1st light is on)

Other info. The ABS INOP light is on.

Fatdog2

Before you spend big bucks,I would change the wires,plugs,(COIL WIRE) first,and see if that helps.I think there is a module for the trans that can go bad.Might replace the third light bulb for the abs,as it is wired into the abs.Hope this helps.And use the correct bulbs called for in the manual.

slick1hunting

I would get the cable so you can hook a laptop up and datalog and check for trouble codes. My guess it may show you a code for the tranny. Id be sceptical of the "chip" or tune thats in the car. Someone should be able to help guide you much better than me especially if you can scan it for codes and datalog it. Ive read of others with this problem so might try a search if you havent both on this site and google.

z28kid911

What program do I need and where would I hook it up to?

I appreciate it, I'm gonna get the fluids checked, and basics done. I don't believe the tranny is f'd but then again since it is a 94 I think it could be a computer/electric shift issue rather than the tranny slipping. Either way I am going to baby it until I get it figured out.

Thanks for all responses so far, any more input would be great.

This is my baby were talkin' about so I'm scared for her!!!!!

Brakes do seem a little weak and oil pressure seems low at idle and only climes to 40 at mid throttle. Abnormal? My v6 always had higher oil pressure.

You guys are very knowledgable!

slick1hunting

This site will give you the basic information. The transmission section is about 3/4 of the way down. I think the part about cable and software is at the beginning. He "rents" the equiptment and can check and adjust via email. There are a few other email tuners that several people on here use as well. In my opinion I would consider something on this lines as they could read your existing tune and it might alert to any mods that you dont know about. I looked at the tranny section real quick as I dont have an auto and looks like tire size and or gear change could be one easy thing to check that could effect shift points. This will give you some of the possibilities. You could also talk with any of the lt1 email tuners as what they recomend to buy and or try. Run some searches for lt1 tuning and lt1 dataloging. The cable connects in the obd port and goes to a serial port on the laptop or a converter to usb. LT1 PCM Tuning - Tips & Tricks for DIY Tuning!

slick1hunting

This should give you an idea about oil pressure. https://www.camaroz28.com/forums/lt1...essure-871679/

parkers Z28

My car had the same problems that you are experiencing ..
is the transmission slipping ?? does it have a shift kit ?? If it is just hitting the rev limiter at wot you will need to have the pcm programmed to shift earlier ....
ABS light .... have you changed the rear spoiler ??? the SS spoiler will turn the ABS light on
oil pressure .. you only need 10psi @ 1000rpm

z28kid911

Thank you so much for all the info, I apologize if this isn't in the tranny section. I was kinda panicking and wanted to get this posted.

Stock spoiler. And I am pretty sure the light is working also.

And no, I don't believe my transmission is slipping at all (I hope to this problem isn't a tranny issue because I just got it) and I'm leaning towards a computer issue. I have talked to knowledgable mechanics who feel similarly but I'm goin to try to get a proper diagnosis of the problems. I think the My brakes do feel a little weak, the brake master cylinder didn't look like it was leaking at all and it seemed to have enough brake fluid but they did feel weak/dull.

I'll post pics and try to stay active on here, I love the car and I really appreciate all the help so far!

parkers Z28

once you have the pcm tuned it should fix your problem... there is a guy on here Frank 12scndz he could explai in detail (" resident expert ") what is going on with the transmission not shifting at wot

Do a search for shoebox on here look at his signature at ( how to) there is something in there about adjusting the transmission cable that will take care of the indicator needle. there is a lot of other useful information on there a must see !!!!

Dtimekw

shbox.com

mjones60

Yes you might need the PCM tuned. I tuned my PCM once and when I trashed my transmission it would shift too early on WOT then I tuned the fresh transmission and its back on track.

englundjd

1-2 shift usually doesn't cause trouble in the 4l60e, if you let off the gas does it shift firmly (as in can you tell it shifted) or does it just seem to slide into gear?

z28kid911

Honestly I'm not positive because I really haven't gotten to drive it that much. But one shop is telling me my tranny needs to be damned replace but I could swear it wasn't slipping.

It is 120k miles.