94 buick park ave. wont shift into o.d.
 

My 94 park ave wont engage into overdrive. Also, when the car is warm and it drops down into 1st gearand coming to a stop. the car will lose power and stall out. But fire right back up and drive on.

Welcome to the forums Thomas.
Do you have a dash service engine light on?
The idle may be dropping after stopping, could be the IAC (intake air control )
Have you got the car in a good state of tune with new plugs, wires, fuel filter etc?
The car wont shift right either if it is bogging out, or experiencing misfires etc.
When hot, is the transmission fluid at the full line while in park. on level ground?

Yes. The service engine light is on.

You should be able to read the code or codes by using the paper clip test then.
https://www.gmforum.com/obd-i-troubl...p-test-306836/
The generic list of trouble codes are here:
https://www.gmforum.com/obd-i-troubl...eneric-306838/
Post back the codes that are stored please.

94 buick
 

Ok. I will try it. Thank u so much for your time and knowledge.

94 buick
 

So i tried it and nothing happend. I have 8 slots or pins on each row. So 16 total. Idk.? If it changes how the codes can be read.?

I moved the other post to trash on 1.5. Lets keep the information all in one place here please..
The paper clip test only applies to the 12 pin ALDL OBD connector.
You have the transitional year car.
An OBD 2 (16pin) connector, the OBD1.5 system.
You can make some calls to local shops,even Autozone, to see if they have the reader capable of this set up.

He's looking at going to the dealer.

94 buick
 

Dealet want 100.00 bucks to read the codes. No way.

Actron Super Autoscanner Model CP9145 9807 262 | eBay

Actron CP9145 is my favorite move for this problem. Essentially, any scanner must specify it is compatible with GM OBD 1.5 to get it to work.

Put the $100 to a scanner, and you won't have to worry again, instead of the dealership, if you do your own work. I have this same unit I got off of ebay for $40 (A steal) and have never looked back.

94 buick
 

Thank you. For knowledge.!

100.00 just to read basic codes is ridiculous, like mentioned most auto parts stores will read the OBD2 codes for free.
You can get your own scanner like suggested, but they will only scan for DTC's, if you have a more serious problem you will have to have a dealer use a Tech II on it, and then it may cost you around 100.00 or so..

Yeah. Autozone said they can only read codes 96 and up.

And to clarify as well, the Actron I posted can also show live data, which can help to diagnose issues. It's not a tech 1, but I can read throttle position, o2 values, gear commanded, etc, which will help to confirm what the computer is requesting (or not for that matter) and why.

This is something, that GM has lost, and will never get back....relationship with a customer.......

The small dealerships, had that......GM got rid of them, combining dealerships from an area, into one huge machine......you are now just a number......you deal with Service Writers, that are not there when you come back to that shop(turnover in these places is amazing).....

At my shop, we knew the first names of our steady customers, and we went out of our way, to not treat them like a number.......if a steady customer had a CE light on, he would just pull in, talk to the SM, and one of us would go out there and read the code......the SM would then give him his options.....no money exchanged hands....

It takes 5 minutes to read a code......to charge a customer 100 bucks for that is poor public relations.....and you are throwing away potential work.....I mean if it's Joe Blow off the street, yes you charge him for a code reading.....but not for an hour's labor, more like 15 minutes....and it should be deducted if work is done to the car....that's the way we handled it...

You are right, I overlooked where it was mentioned that you had OBD 1.5
Do you have another local Buick dealer that is not too far away?
If so maybe try giving them a call to see if they'd scan it for you for a much more reasonable price.
Unless you are able to get the Actron scanner that will read codes from your OBD 1.5 system, if so that would be the best money spent.

94 buick
 

Its the same dealer where it was purchased from. Your right. !!! Corp. America.!!! Forgot all about the lil guy. Thank u too all for your info and knowlegde. I will let you all know what the problem is

We look forward to hear back from you & what code/s are stored for sure.
Hopefully it is something simple. Best-o luck !