Obd1.5
Hello How do I read check engine codes on a 1995 pontiacFirebird 5.7? it has opd 2 port with 7 connectors which scan tool Can I purchase to be able to read the trouble codes? Check engine light comes and goes while driving sometimes. And I'm dealing with a rough idol and change many parts on the vehicle. Sometimes it does a weird shift, most of the time shifts, perfect. The sensors I've already replaced mass airflow Sensor. map sensor. throttle position sensor .idle air control valve. egr, wires and plugs distributor. And ECU fuel pump . And filter .once car warms up to operating temperature, misfire goes away at idle. and there's no vacuum leaks on the intake manifold. The only sensors I have not replaced that are probably twenty nine years old or so the oxygen sensors.
did you try the paperclip method?
https://carkiller.com/scottykilmer/qa/trouble-light/
https://carkiller.com/scottykilmer/howto/which-scan-tool-should-i-get/#post-256446
I've already replaced ...
Randomly changing parts is a terrible way to fix problems. You could even make things worse.
@imperator not sure what pins to jump i have read online, saying that you can't use that method on the 95 to the newer style, obd2 on the owner's manual, it just talks about how to program the remote for the door locks using a couple of pins. just don't want to short something out.
it's all over the internet
https://www.apexautoaz.com/gm-obd-1-codes.html
Here are your code definitions and troubleshooting steps
@imperator yes, I understand it's all over the internet. I myself is a car mechanic. This car was sitting many years when I do research online about the connector jumping pins, they only show that style ,obd 1 not the obd2 style that I have in my vehicle because my vehicle works with obd 1 hope that doesn't not sound confusing.
@imperator i guess my year is the year. They just started transiting into the obd 2 port, so it basically only has 7 pins inside instead of 16.
Gotcha. The service manual suggests that a Tech1 may be the only way to read codes. There could still be 3rd party tools out there, but I couldn't tell you which one. Transition year vehicles tend to be a major pain, and 1995 is the problem year for many GM's
@imperator lol ok thank you your right it is very difficult not to know what scanner will work. But I will keep trying to find one .
That's a bit tough, seeing as how it's a mashup of OBD1 and OBD2, neither fish nor foul, there are not many options.
Since the Tech2 was the dealer scan tool for that car presumably one of those would work, though it's possible an adapter cable might be needed. Used Tech2 scan tools pop up on eBay and Chinese-made clones are available. (Unfortunately they are not cheap and only work on GM vehicles from around 1992-2010.)
Beyond that, there is an old Snap-On scan tool, model MT2500 (nicknamed the "brick") that is supposed to work on GM OBD 1.5. The MT2500 can be found used. It would need to have the appropriate cartridge and cable for your car, and working examples are not cheap.
An online search also brings up comments about OTC and Actron scan tools that may work, but details are difficult to come by.
